Ubuntu
linux package

[Regression] Failed to boot disco kernel built from master-next (kernel kernel NULL pointer dereference)

Bug #1853981 reported by Po-Hsu Lin on 2019-11-26

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	Invalid	Undecided	Unassigned
	Disco	Fix Released	High	Stefan Bader

Bug Description

Build environment: Tangerine build server with dchroot disco-amd64
Build command: fakeroot debian/rules do_tools=0 no_dumpfile=1 clean binary-generic binary-headers

While building the test kernel for Disco, the kernel built from master-next branch (head: e903d6a UBUNTU: upstream stable to v4.19.83, v5.3.10) will result in the following error on boot with an AMD64 KVM node:
[ 2.724234] [TTM] Initializing pool allocator
[ 2.725770] [TTM] Initializing DMA pool allocator
[ 2.727918] [drm] fb mappable at 0xFC000000
[ 2.729462] [drm] vram aper at 0xFC000000
[ 2.729980] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
[ 2.730902] [drm] size 33554432
[ 2.735026] #PF error: [normal kernel read fault]
[ 2.735028] PGD 0 P4D 0
[ 2.735032] Oops: 0000 [#1] SMP PTI
[ 2.735036] CPU: 1 PID: 211 Comm: systemd-udevd Not tainted 5.0.0-37-generic #40
[ 2.736230] [drm] fb depth is 16
[ 2.738490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
[ 2.739526] [drm] pitch is 2048
[ 2.740751] RIP: 0010:attempt_merge+0x145/0x9d0
[ 2.740753] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
[ 2.740754] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
[ 2.753490] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input4
[ 2.758417] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 0000000000000000
[ 2.758418] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 2.758418] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 0000000000000004
[ 2.758419] R10: 0000000000000001 R11: 0000000000000800 R12: ffff9a1b33260000
[ 2.758420] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 0000000000000000
[ 2.758421] FS: 00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) knlGS:0000000000000000
[ 2.758422] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.758423] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 00000000000006e0
[ 2.758426] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2.786182] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2.786183] Call Trace:
[ 2.786188] ? insert_work+0x6c/0x80
[ 2.786193] ? __sbitmap_get_word+0x31/0x90
[ 2.786194] blk_attempt_req_merge+0xe/0x30
[ 2.786198] elv_attempt_insert_merge+0x35/0x90
[ 2.786201] blk_mq_sched_try_insert_merge+0x42/0x50
[ 2.786203] dd_insert_requests+0x90/0x1c0
[ 2.786206] blk_mq_sched_insert_request+0x12d/0x1a0
[ 2.786208] blk_mq_make_request+0x36c/0x4d0
[ 2.786210] generic_make_request+0x19e/0x400
[ 2.786212] submit_bio+0x49/0x140
[ 2.786215] ? guard_bio_eod+0x32/0x100
[ 2.786217] submit_bh_wbc+0x185/0x1b0
[ 2.786219] block_read_full_page+0x24d/0x330
[ 2.786222] ? check_disk_change+0x70/0x70
[ 2.786225] ? count_shadow_nodes+0x140/0x140
[ 2.786228] blkdev_readpage+0x18/0x20
[ 2.786232] do_read_cache_page+0x374/0x7a0
[ 2.786234] ? blkdev_writepages+0x10/0x10
[ 2.786237] ? get_page_from_freelist+0xefe/0x1440
[ 2.786240] ? __radix_tree_replace+0x59/0xf0
[ 2.786243] read_cache_page+0x12/0x20
[ 2.786244] read_dev_sector+0x2d/0xd0
[ 2.786246] read_lba+0xcd/0x220
[ 2.786248] efi_partition+0x1e4/0x6de
[ 2.786250] ? vsnprintf+0x103/0x520
[ 2.786252] ? snprintf+0x49/0x60
[ 2.786253] ? is_gpt_valid.part.7+0x470/0x470
[ 2.786255] check_partition+0x13e/0x238
[ 2.786256] rescan_partitions+0xaf/0x2a0
[ 2.786259] ? _cond_resched+0x19/0x30
[ 2.786260] __blkdev_get+0x393/0x550
[ 2.786262] blkdev_get+0x10c/0x330
[ 2.786264] ? wake_up_bit+0x42/0x50
[ 2.786267] ? unlock_new_inode+0x53/0x70
[ 2.786269] ? bdget+0x111/0x130
[ 2.786270] __device_add_disk+0x321/0x480
[ 2.786272] device_add_disk+0x13/0x20
[ 2.786275] virtblk_probe+0x4ef/0x79f [virtio_blk]
[ 2.786278] virtio_dev_probe+0x172/0x230
[ 2.786282] really_probe+0xfe/0x3b0
[ 2.786284] driver_probe_device+0xba/0x100
[ 2.786286] __driver_attach+0xf1/0x120
[ 2.786288] ? driver_probe_device+0x100/0x100
[ 2.786290] bus_for_each_dev+0x79/0xc0
[ 2.786292] ? kmem_cache_alloc_trace+0x1bd/0x1d0
[ 2.786294] driver_attach+0x1e/0x20
[ 2.786295] bus_add_driver+0x159/0x230
[ 2.786297] ? 0xffffffffc0410000
[ 2.786299] driver_register+0x70/0xc0
[ 2.786300] ? 0xffffffffc0410000
[ 2.786302] register_virtio_driver+0x20/0x30
[ 2.786304] init+0x56/0x1000 [virtio_blk]
[ 2.786308] do_one_initcall+0x4a/0x1c4
[ 2.786310] ? _cond_resched+0x19/0x30
[ 2.786311] ? kmem_cache_alloc_trace+0x167/0x1d0
[ 2.786314] do_init_module+0x60/0x220
[ 2.786316] load_module+0x1797/0x1a00
[ 2.786319] __do_sys_finit_module+0xbd/0x120
[ 2.786321] ? __do_sys_finit_module+0xbd/0x120
[ 2.786323] __x64_sys_finit_module+0x1a/0x20
[ 2.786325] do_syscall_64+0x5a/0x110
[ 2.786329] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 2.786330] RIP: 0033:0x7fd50d7012e9
[ 2.786332] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 77 cb 0c 00 f7 d8 64 89 01 48
[ 2.786332] RSP: 002b:00007fff6dd12248 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 2.786334] RAX: ffffffffffffffda RBX: 000055b98c946aa0 RCX: 00007fd50d7012e9
[ 2.786335] RDX: 0000000000000000 RSI: 00007fd50d5e2cad RDI: 0000000000000005
[ 2.786335] RBP: 00007fd50d5e2cad R08: 0000000000000000 R09: 000055b98c926ab0
[ 2.786336] R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
[ 2.786337] R13: 000055b98c934800 R14: 0000000000020000 R15: 000055b98c946aa0
[ 2.786338] Modules linked in: psmouse cirrus(+) ttm virtio_blk(+) drm_kms_helper virtio_net(+) syscopyarea sysfillrect net_failover sysimgblt failover fb_sys_fops drm floppy i2c_piix4 pata_acpi
[ 2.786345] CR2: 0000000000000020
[ 2.786379] ---[ end trace 1c7dd9ecceb0cff9 ]---
[ 2.786382] RIP: 0010:attempt_merge+0x145/0x9d0
[ 2.786383] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
[ 2.786384] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
[ 2.786385] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 0000000000000000
[ 2.786386] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 2.786386] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 0000000000000004
[ 2.786387] R10: 0000000000000001 R11: 0000000000000800 R12: ffff9a1b33260000
[ 2.786388] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 0000000000000000
[ 2.786389] FS: 00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) knlGS:0000000000000000
[ 2.786390] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.786391] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 00000000000006e0
[ 2.786394] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2.786395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2.786728] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input3
[ 2.787939] fbcon: cirrusdrmfb (fb0) is primary device
[ 2.802935] Console: switching to colour frame buffer device 128x48
[ 2.969597] virtio_net virtio1 ens4: renamed from eth0
[ 3.078798] cirrus 0000:00:02.0: fb0: cirrusdrmfb frame buffer device

See original description

Tags:

CVE References

Po-Hsu Lin (cypressyew) on 2019-11-26

description:

updated

Revision history for this message

Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote on 2019-11-26: Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1853981

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status:	New → Incomplete
Changed in linux (Ubuntu Disco):
status:	New → Incomplete
tags:	added: disco

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2019-11-26:

Current bisect result (not finished yet):
git bisect start
# bad: [e903d6a85368180af5f09bf5d0be0308b757694d] UBUNTU: upstream stable to v4.19.83, v5.3.10
git bisect bad e903d6a85368180af5f09bf5d0be0308b757694d
# good: [e421062fe0c6fba6d639c9ca57e3587171e7664f] UBUNTU: Ubuntu-5.0.0-37.40
git bisect good e421062fe0c6fba6d639c9ca57e3587171e7664f
# bad: [120233013313edb21f4003433af1661e8961739d] tty: serial: owl: Fix the link time qualifier of 'owl_uart_exit()'
git bisect bad 120233013313edb21f4003433af1661e8961739d
# good: [482f7e77e9d7193bc165fab34bb54f142157d270] ARM: dts: Fix wrong clocks for dra7 mcasp
git bisect good 482f7e77e9d7193bc165fab34bb54f142157d270
# bad: [cc337c66ceb8c0bd641a821889fd06016106422f] dm snapshot: rework COW throttling to fix deadlock
git bisect bad cc337c66ceb8c0bd641a821889fd06016106422f

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2019-11-27:

bisect.log Edit (1.6 KiB, text/plain)

Bisect complete:
# first bad commit: [1078686a99eabb5f627cf0f1e4d9f4a05993917a] blk-mq: honor IO scheduler for multiqueue devices

Complete bisect log can be found in the attachment.

I have a test kernel with this patch reverted, and it boots fine.

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2019-11-28:

disco.log Edit (51.0 KiB, text/html)

With kernel built with b99079a8045a084722a6a33cca3c396634e6d241 (UBUNTU: upstream stable to v4.19.86, v5.3.13)
this issue still exists.

A more complete dmesg output could be found in the attachment.

Revision history for this message

Stefan Bader (smb) wrote on 2019-12-02:

I think that "blk-mq: honor IO scheduler for multiqueue devices" is broken in disco because it misses the following commit:

commit 970d168de636ddac8221cbd4a11d7678943e7379
blk-mq: simplify blk_mq_make_request()

Move the blk_mq_bio_to_request() call in front of the if-statement.

Either this has to be picked before the mq change or there must be a call to blk_mq_bio_to_request(rq, bio) before calling blk_mq_sched_insert_request(rq, false, true, true):

}

                blk_add_rq_to_plug(plug, rq);
+ } else if (q->elevator) {
+ blk_mq_bio_to_request(rq, bio);
+ blk_mq_sched_insert_request(rq, false, true, true);
        } else if (plug && !blk_queue_nomerges(q)) {
                blk_mq_bio_to_request(rq, bio);

Kleber Sacilotto de Souza (kleber-souza) on 2019-12-02

Changed in linux (Ubuntu):
status:	Incomplete → Invalid
Changed in linux (Ubuntu Disco):
status:	Incomplete → In Progress

Stefan Bader (smb) on 2019-12-02

Changed in linux (Ubuntu Disco):
importance:	Undecided → High
assignee:	nobody → Stefan Bader (smb)

Revision history for this message

Sean Feole (sfeole) wrote on 2019-12-02:

dmesg.txt Edit (32.7 KiB, text/plain)

I attempted to test a boot kernel built by smb, using the same test env filed in the bug originally,

linux-buildinfo-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb
linux-cloud-tools-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb
linux-headers-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb
linux-image-unsigned-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb
linux-modules-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb
linux-modules-extra-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb
linux-tools-5.0.0-37-generic_5.0.0-37.40+mnext1_amd64.deb

dmesg attached, I did not see the failure as noted in the original description. Nor any other failures to note.

Linux automation-vm1 5.0.0-37-generic #40+mnext1 SMP Mon Dec 2 13:37:11 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

The system booted successfully

Stefan Bader (smb) on 2019-12-02

Changed in linux (Ubuntu Disco):
status:	In Progress → Fix Committed

Revision history for this message

Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote on 2019-12-03:

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-disco' to 'verification-done-disco'. If the problem still exists, change the tag 'verification-needed-disco' to 'verification-failed-disco'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags:

added: verification-needed-disco

Revision history for this message

Khaled El Mously (kmously) wrote on 2019-12-19:

Set verification-done-disco based on Sean Feole's comment

tags:

added: verification-done-disco
removed: verification-needed-disco

Revision history for this message

Launchpad Janitor (janitor) wrote on 2020-01-06:

Download full text (42.3 KiB)

This bug was fixed in the package linux - 5.0.0-38.41

---------------
linux (5.0.0-38.41) disco; urgency=medium

* disco/linux: 5.0.0-38.41 -proposed tracker (LP: #1854788)

  * [Regression] Failed to boot disco kernel built from master-next (kernel
    kernel NULL pointer dereference) (LP: #1853981)
    - SAUCE: blk-mq: Fix blk_mq_make_request for mq devices

* CVE-2019-14901
- SAUCE: mwifiex: Fix heap overflow in mmwifiex_process_tdls_action_frame()

* CVE-2019-14896 // CVE-2019-14897
- SAUCE: libertas: Fix two buffer overflows at parsing bss descriptor

* CVE-2019-14895
- SAUCE: mwifiex: fix possible heap overflow in mwifiex_process_country_ie()

  * [CML] New device id's for CMP-H (LP: #1846335)
    - mmc: sdhci-pci: Add another Id for Intel CML
    - i2c: i801: Add support for Intel Comet Lake PCH-H
    - mtd: spi-nor: intel-spi: Add support for Intel Comet Lake-H SPI serial flash
    - mfd: intel-lpss: Add Intel Comet Lake PCH-H PCI IDs

* Please add patch fixing RK818 ID detection (LP: #1853192)
- SAUCE: mfd: rk808: Fix RK818 ID template

  * [SRU][B/OEM-B/OEM-OSP1/D] Enable new Elan touchpads which are not in current
    whitelist (LP: #1853246)
    - Input: elan_i2c - export the device id whitelist
    - HID: quirks: Refactor ELAN 400 and 401 handling

* Lenovo dock MAC Address pass through doesn't work in Ubuntu (LP: #1827961)
- r8152: Add macpassthru support for ThinkPad Thunderbolt 3 Dock Gen 2

  * [CML-S62] Need enable turbostat patch support for Comet lake- S 6+2
    (LP: #1847451)
    - SAUCE: tools/power turbostat: Add Cometlake support

  * External microphone can't work on some dell machines with the codec alc256
    or alc236 (LP: #1853791)
    - SAUCE: ALSA: hda/realtek - Move some alc256 pintbls to fallback table
    - SAUCE: ALSA: hda/realtek - Move some alc236 pintbls to fallback table

  * Memory leak in net/xfrm/xfrm_state.c - 8 pages per ipsec connection
    (LP: #1853197)
    - xfrm: Fix memleak on xfrm state destroy

  * CVE-2019-18660: patches for Ubuntu (LP: #1853142) // CVE-2019-18660
    - powerpc/64s: support nospectre_v2 cmdline option
    - powerpc/book3s64: Fix link stack flush on context switch
    - KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernel

* Raydium Touchscreen on ThinkPad L390 does not work (LP: #1849721)
- HID: i2c-hid: fix no irq after reset on raydium 3118

  * Make Goodix I2C touchpads work (LP: #1853842)
    - HID: i2c-hid: Remove runtime power management
    - HID: i2c-hid: Send power-on command after reset

  * Touchpad doesn't work on Dell Inspiron 7000 2-in-1 (LP: #1851901)
    - Revert "UBUNTU: SAUCE: mfd: intel-lpss: add quirk for Dell XPS 13 7390
      2-in-1"
    - lib: devres: add a helper function for ioremap_uc
    - mfd: intel-lpss: Use devm_ioremap_uc for MMIO

* CVE-2019-19055
- nl80211: fix memory leak in nl80211_get_ftm_responder_stats

  * [CML-S62] Need enable intel_rapl patch support for Comet lake- S 6+2
    (LP: #1847454)
    - powercap/intel_rapl: add support for CometLake Mobile
    - powercap/intel_rapl: add support for Cometlake desktop

* [CML-S62] Need enable intel_pmc_core driver patch for Comet l...

This bug was fixed in the package linux - 5.0.0-38.41

---------------
linux (5.0.0-38.41) disco; urgency=medium

* disco/linux: 5.0.0-38.41 -proposed tracker (LP: #1854788)

* [Regression] Failed to boot disco kernel built from master-next (kernel
    kernel NULL pointer dereference) (LP: #1853981)
    - SAUCE: blk-mq: Fix blk_mq_make_request for mq devices

* CVE-2019-14901
    - SAUCE: mwifiex: Fix heap overflow in mmwifiex_process_tdls_action_frame()

* CVE-2019-14896 // CVE-2019-14897
    - SAUCE: libertas: Fix two buffer overflows at parsing bss descriptor

* CVE-2019-14895
    - SAUCE: mwifiex: fix possible heap overflow in mwifiex_process_country_ie()

* Please add patch fixing RK818 ID detection (LP: #1853192)
    - SAUCE: mfd: rk808: Fix RK818 ID template

* Lenovo dock MAC Address pass through doesn't work in Ubuntu  (LP: #1827961)
    - r8152: Add macpassthru support for ThinkPad Thunderbolt 3 Dock Gen 2

* [CML-S62] Need enable turbostat patch support for Comet lake- S 6+2
    (LP: #1847451)
    - SAUCE: tools/power turbostat: Add Cometlake support

* Memory leak in net/xfrm/xfrm_state.c - 8 pages per ipsec connection
    (LP: #1853197)
    - xfrm: Fix memleak on xfrm state destroy

* Raydium Touchscreen on ThinkPad L390 does not work (LP: #1849721)
    - HID: i2c-hid: fix no irq after reset on raydium 3118

* Make Goodix I2C touchpads work (LP: #1853842)
    - HID: i2c-hid: Remove runtime power management
    - HID: i2c-hid: Send power-on command after reset

* CVE-2019-19055
    - nl80211: fix memory leak in nl80211_get_ftm_responder_stats

* [CML-S62] Need enable intel_pmc_core driver patch for Comet lake- S 6+2
    (LP: #1847450)
    - SAUCE: platform/x86: intel_pmc_core: Add Comet Lake (CML) platform support
      to intel_pmc_core driver

* update ENA driver for DIMLIB dynamic interrupt moderation (LP: #1853180)
    - net: ena: add intr_moder_rx_interval to struct ena_com_dev and use it
    - net: ena: switch to dim algorithm for rx adaptive interrupt moderation
    - net: ena: reimplement set/get_coalesce()
    - net: ena: enable the interrupt_moderation in driver_supported_features
    - net: ena: remove code duplication in
      ena_com_update_nonadaptive_moderation_interval _*()
    - net: ena: remove old adaptive interrupt moderation code from ena_netdev
    - net: ena: remove ena_restore_ethtool_params() and relevant fields
    - net: ena: remove all old adaptive rx interrupt moderation code from ena_com
    - net: ena: fix update of interrupt moderation register
    - net: ena: fix retrieval of nonadaptive interrupt moderation intervals
    - net: ena: fix incorrect update of intr_delay_resolution
    - net: ena: Select DIMLIB for ENA_ETHERNET
    - SAUCE: net: ena: fix issues in setting interrupt moderation params in
      ethtool
    - SAUCE: net: ena: fix too long default tx interrupt moderation interval

* CONFIG_ARCH_ROCKCHIP is not set in ubuntu 18.04 aarch64,arm64 (LP: #1825222)
    - [Config] Enable ROCKCHIP support for arm64

* remount of multilower moved pivoted-root overlayfs root, results in I/O
    errors on some modified files (LP: #1824407)
    - SAUCE: ovl: fix lookup failure on multi lower squashfs

* backport DIMLIB (lib/dim/) to pre-5.2 kernels (LP: #1852637)
    - linux/dim: Move logic to dim.h
    - linux/dim: Remove "net" prefix from internal DIM members
    - linux/dim: Rename externally exposed macros
    - linux/dim: Rename net_dim_sample() to net_dim_update_sample()
    - linux/dim: Rename externally used net_dim members
    - [Config] updateconfigs for DIMLIB
    - linux/dim: Move implementation to .c files
    - linux/dim: Add completions count to dim_sample
    - linux/dim: Implement RDMA adaptive moderation (DIM)
    - linux/dim: Fix overflow in dim calculation
    - lib/dim: Fix -Wunused-const-variable warnings

* The alsa hda driver is not loaded due to the missing of PCIID for Comet
    Lake-S [8086:a3f0] (LP: #1852070)
    - SAUCE: ALSA: hda: Add Cometlake-S PCI ID

* Can't adjust brightness on DELL UHD dGPU AIO (LP: #1813877)
    - SAUCE: platform/x86: dell-uart-backlight: add missing status command
    - SAUCE: platform/x86: dell-uart-backlight: load driver by scalar status
    - SAUCE: platform/x86: dell-uart-backlight: add force parameter
    - SAUCE: platform/x86: dell-uart-backlight: add quirk for old platforms

* Enable framebuffer fonts auto selection for HighDPI screen (LP: #1851623)
    - fonts: Fix coding style
    - fonts: Prefer a bigger font for high resolution screens

* Disable unreliable HPET on CFL-H system (LP: #1852216)
    - SAUCE: x86/intel: Disable HPET on Intel Coffe Lake H platforms

* i40e: Setting VF MAC address causes General Protection Fault (LP: #1852432)
    - i40e: Fix crash caused by stress setting of VF MAC addresses

* CVE-2019-19072
    - tracing: Have error path in predicate_parse() free its allocated memory

* CVE-2019-2214
    - binder: Set end of SG buffer area properly.

* Disco update: upstream stable patchset 2019-11-27 (LP: #1854229)
    - i2c: mediatek: modify threshold passed to i2c_get_dma_safe_msg_buf()
    - Revert "OPP: Protect dev_list with opp_table lock"
    - net: cdc_ncm: Signedness bug in cdc_ncm_set_dgram_size()
    - mm/memory_hotplug: don't access uninitialized memmaps in shrink_pgdat_span()
    - mm/memory_hotplug: fix updating the node span
    - arm64: uaccess: Ensure PAN is re-enabled after unhandled uaccess fault
    - fbdev: Ditch fb_edid_add_monspecs
    - bpf, x32: Fix bug for BPF_ALU64 | BPF_NEG
    - bpf, x32: Fix bug with ALU64 {LSH, RSH, ARSH} BPF_X shift by 0
    - bpf, x32: Fix bug with ALU64 {LSH, RSH, ARSH} BPF_K shift by 0
    - bpf, x32: Fix bug for BPF_JMP | {BPF_JSGT, BPF_JSLE, BPF_JSLT, BPF_JSGE}
    - bpf: btf: Fix a missing check bug

* Disco update: upstream stable patchset 2019-11-26 (LP: #1854094)
    - KVM: x86: introduce is_pae_paging
    - scsi: core: Handle drivers which set sg_tablesize to zero
    - ax88172a: fix information leak on short answers
    - ipmr: Fix skb headroom in ipmr_get_route().
    - net: gemini: add missed free_netdev
    - net: usb: qmi_wwan: add support for Foxconn T77W968 LTE modules
    - slip: Fix memory leak in slip_open error path
    - ALSA: usb-audio: Fix missing error check at mixer resolution test
    - ALSA: usb-audio: not submit urb for stopped endpoint
    - ALSA: usb-audio: Fix incorrect NULL check in create_yamaha_midi_quirk()
    - ALSA: usb-audio: Fix incorrect size check for processing/extension units
    - Btrfs: fix log context list corruption after rename exchange operation
    - Input: ff-memless - kill timer in destroy()
    - Input: synaptics-rmi4 - fix video buffer size
    - Input: synaptics-rmi4 - disable the relative position IRQ in the F12 driver
    - Input: synaptics-rmi4 - do not consume more data than we have (F11, F12)
    - Input: synaptics-rmi4 - clear IRQ enables for F54
    - Input: synaptics-rmi4 - destroy F54 poller workqueue when removing
    - IB/hfi1: Ensure full Gen3 speed in a Gen4 system
    - IB/hfi1: Use a common pad buffer for 9B and 16B packets
    - i2c: acpi: Force bus speed to 400KHz if a Silead touchscreen is present
    - ecryptfs_lookup_interpose(): lower_dentry->d_inode is not stable
    - ecryptfs_lookup_interpose(): lower_dentry->d_parent is not stable either
    - net: ethernet: dwmac-sun8i: Use the correct function in exit path
    - iommu/vt-d: Fix QI_DEV_IOTLB_PFSID and QI_DEV_EIOTLB_PFSID macros
    - mm: mempolicy: fix the wrong return value and potential pages leak of mbind
    - mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()
    - mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup()
    - mmc: sdhci-of-at91: fix quirk2 overwrite
    - dmaengine: at_xdmac: remove a stray bottom half unlock
    - slcan: Fix memory leak in error path
    - tcp: remove redundant new line from tcp_event_sk_skb
    - dpaa2-eth: free already allocated channels on probe defer
    - KVM: MMU: Do not treat ZONE_DEVICE pages as being reserved
    - drm/i915: update rawclk also on resume
    - ntp/y2038: Remove incorrect time_t truncation
    - mm/page_io.c: do not free shared swap slots

* Disco update: upstream stable patchset 2019-11-22 (LP: #1853659)
    - bonding: fix state transition issue in link monitoring
    - CDC-NCM: handle incomplete transfer of MTU
    - ipv4: Fix table id reference in fib_sync_down_addr
    - net: ethernet: octeon_mgmt: Account for second possible VLAN header
    - net: fix data-race in neigh_event_send()
    - net: qualcomm: rmnet: Fix potential UAF when unregistering
    - net: usb: qmi_wwan: add support for DW5821e with eSIM support
    - NFC: fdp: fix incorrect free object
    - nfc: netlink: fix double device reference drop
    - NFC: st21nfca: fix double free
    - qede: fix NULL pointer deref in __qede_remove()
    - net: mscc: ocelot: don't handle netdev events for other netdevs
    - net: mscc: ocelot: fix NULL pointer on LAG slave removal
    - ipv6: fixes rt6_probe() and fib6_nh->last_probe init
    - net: hns: Fix the stray netpoll locks causing deadlock in NAPI path
    - ALSA: timer: Fix incorrectly assigned timer instance
    - ALSA: bebob: fix to detect configured source of sampling clock for Focusrite
      Saffire Pro i/o series
    - ALSA: hda/ca0132 - Fix possible workqueue stall
    - mm: memcontrol: fix network errors from failing __GFP_ATOMIC charges
    - mm, meminit: recalculate pcpu batch and high limits after init completes
    - mm: thp: handle page cache THP correctly in PageTransCompoundMap
    - mm, vmstat: hide /proc/pagetypeinfo from normal users
    - dump_stack: avoid the livelock of the dump_lock
    - tools: gpio: Use !building_out_of_srctree to determine srctree
    - perf tools: Fix time sorting
    - drm/radeon: fix si_enable_smc_cac() failed issue
    - HID: wacom: generic: Treat serial number and related fields as unsigned
    - soundwire: depend on ACPI
    - soundwire: bus: set initial value to port_status
    - arm64: Do not mask out PTE_RDONLY in pte_same()
    - ceph: fix use-after-free in __ceph_remove_cap()
    - ceph: add missing check in d_revalidate snapdir handling
    - iio: adc: stm32-adc: fix stopping dma
    - iio: imu: adis16480: make sure provided frequency is positive
    - iio: srf04: fix wrong limitation in distance measuring
    - ARM: sunxi: Fix CPU powerdown on A83T
    - netfilter: nf_tables: Align nft_expr private data to 64-bit
    - netfilter: ipset: Fix an error code in ip_set_sockfn_get()
    - intel_th: pci: Add Comet Lake PCH support
    - intel_th: pci: Add Jasper Lake PCH support
    - x86/apic/32: Avoid bogus LDR warnings
    - SMB3: Fix persistent handles reconnect
    - can: usb_8dev: fix use-after-free on disconnect
    - can: flexcan: disable completely the ECC mechanism
    - can: c_can: c_can_poll(): only read status register after status IRQ
    - can: peak_usb: fix a potential out-of-sync while decoding packets
    - can: rx-offload: can_rx_offload_queue_sorted(): fix error handling, avoid
      skb mem leak
    - can: gs_usb: gs_can_open(): prevent memory leak
    - can: dev: add missing of_node_put() after calling of_get_child_by_name()
    - can: mcba_usb: fix use-after-free on disconnect
    - can: peak_usb: fix slab info leak
    - configfs: stash the data we need into configfs_buffer at open time
    - configfs_register_group() shouldn't be (and isn't) called in rmdirable parts
    - configfs: new object reprsenting tree fragments
    - configfs: provide exclusion between IO and removals
    - configfs: fix a deadlock in configfs_symlink()
    - ALSA: usb-audio: More validations of descriptor units
    - ALSA: usb-audio: Simplify parse_audio_unit()
    - ALSA: usb-audio: Unify the release of usb_mixer_elem_info objects
    - ALSA: usb-audio: Remove superfluous bLength checks
    - ALSA: usb-audio: Clean up check_input_term()
    - ALSA: usb-audio: Fix possible NULL dereference at create_yamaha_midi_quirk()
    - ALSA: usb-audio: remove some dead code
    - ALSA: usb-audio: Fix copy&paste error in the validator
    - usbip: Fix vhci_urb_enqueue() URB null transfer buffer error path
    - usbip: Implement SG support to vhci-hcd and stub driver
    - PCI: tegra: Enable Relaxed Ordering only for Tegra20 & Tegra30
    - HID: google: add magnemite/masterball USB ids
    - dmaengine: xilinx_dma: Fix control reg update in vdma_channel_set_config
    - dmaengine: sprd: Fix the possible memory leak issue
    - HID: intel-ish-hid: fix wrong error handling in ishtp_cl_alloc_tx_ring()
    - RDMA/mlx5: Clear old rate limit when closing QP
    - iw_cxgb4: fix ECN check on the passive accept
    - RDMA/qedr: Fix reported firmware version
    - net/mlx5e: TX, Fix consumer index of error cqe dump
    - net/mlx5: prevent memory leak in mlx5_fpga_conn_create_cq
    - scsi: qla2xxx: fixup incorrect usage of host_byte
    - RDMA/uverbs: Prevent potential underflow
    - net: openvswitch: free vport unless register_netdevice() succeeds
    - scsi: lpfc: Honor module parameter lpfc_use_adisc
    - scsi: qla2xxx: Initialized mailbox to prevent driver load failure
    - netfilter: nf_flow_table: set timeout before insertion into hashes
    - ipvs: don't ignore errors in case refcounting ip_vs module fails
    - ipvs: move old_secure_tcp into struct netns_ipvs
    - bonding: fix unexpected IFF_BONDING bit unset
    - macsec: fix refcnt leak in module exit routine
    - usb: fsl: Check memory resource before releasing it
    - usb: gadget: udc: atmel: Fix interrupt storm in FIFO mode.
    - usb: gadget: composite: Fix possible double free memory bug
    - usb: dwc3: pci: prevent memory leak in dwc3_pci_probe
    - usb: gadget: configfs: fix concurrent issue between composite APIs
    - usb: dwc3: remove the call trace of USBx_GFLADJ
    - perf/x86/amd/ibs: Fix reading of the IBS OpData register and thus precise
      RIP validity
    - perf/x86/amd/ibs: Handle erratum #420 only on the affected CPU family (10h)
    - perf/x86/uncore: Fix event group support
    - USB: Skip endpoints with 0 maxpacket length
    - USB: ldusb: use unsigned size format specifiers
    - usbip: tools: Fix read_usb_vudc_device() error path handling
    - RDMA/iw_cxgb4: Avoid freeing skb twice in arp failure case
    - RDMA/hns: Prevent memory leaks of eq->buf_list
    - scsi: qla2xxx: stop timer in shutdown path
    - nvme-multipath: fix possible io hang after ctrl reconnect
    - fjes: Handle workqueue allocation failure
    - net: hisilicon: Fix "Trying to free already-free IRQ"
    - net: mscc: ocelot: fix vlan_filtering when enslaving to bridge before link
      is up
    - net: mscc: ocelot: refuse to overwrite the port's native vlan
    - iommu/amd: Apply the same IVRS IOAPIC workaround to Acer Aspire A315-41
    - drm/amdgpu: If amdgpu_ib_schedule fails return back the error.
    - drm/amd/display: Passive DP->HDMI dongle detection fix
    - hv_netvsc: Fix error handling in netvsc_attach()
    - usb: dwc3: gadget: fix race when disabling ep with cancelled xfers
    - NFSv4: Don't allow a cached open with a revoked delegation
    - net: ethernet: arc: add the missed clk_disable_unprepare
    - igb: Fix constant media auto sense switching when no cable is connected
    - e1000: fix memory leaks
    - pinctrl: intel: Avoid potential glitches if pin is in GPIO mode
    - ocfs2: protect extent tree in ocfs2_prepare_inode_for_write()
    - pinctrl: cherryview: Fix irq_valid_mask calculation
    - blkcg: make blkcg_print_stat() print stats only for online blkgs
    - iio: imu: mpu6050: Add support for the ICM 20602 IMU
    - iio: imu: inv_mpu6050: fix no data on MPU6050
    - mm/filemap.c: don't initiate writeback if mapping has no dirty pages
    - cgroup,writeback: don't switch wbs immediately on dead wbs if the memcg is
      dead
    - usbip: Fix free of unallocated memory in vhci tx
    - netfilter: ipset: Copy the right MAC address in hash:ip,mac IPv6 sets
    - net: prevent load/store tearing on sk->sk_stamp
    - iio: imu: mpu6050: Fix FIFO layout for ICM20602
    - vsock/virtio: fix sock refcnt holding during the shutdown
    - x86/speculation/taa: Fix printing of TAA_MSG_SMT on IBRS_ALL CPUs
    - x86/cpu: Add Tremont to the cpu vulnerability whitelist
    - Documentation: Add ITLB_MULTIHIT documentation
    - net/tls: fix sk_msg trim on fallback to copy mode
    - net/tls: add a TX lock
    - selftests/tls: add test for concurrent recv and send
    - net/smc: fix ethernet interface refcounting
    - perf map: Use zalloc for map_groups
    - soundwire: depend on ACPI || OF
    - ASoC: rsnd: dma: fix SSI9 4/5/6/7 busif dma address
    - ceph: fix RCU case handling in ceph_d_revalidate()
    - ceph: don't try to handle hashed dentries in non-O_CREAT atomic_open
    - ceph: don't allow copy_file_range when stripe_count != 1
    - cpufreq: intel_pstate: Fix invalid EPB setting
    - dmaengine: sprd: Fix the link-list pointer register configuration issue
    - dmaengine: xilinx_dma: Fix 64-bit simple AXIDMA transfer
    - net/mlx5e: Tx, Fix assumption of single WQEBB of NOP in cleanup flow
    - scsi: ufs-bsg: Wake the device before sending raw upiu commands
    - bpf: Fix use after free in subprog's jited symbol removal
    - bpf: Fix use after free in bpf_get_prog_name
    - xsk: Fix registration of Rx-only sockets
    - net: phy: smsc: LAN8740: add PHY_RST_AFTER_CLK_EN flag
    - virt_wifi: fix refcnt leak in module exit routine
    - hwmon: (ina3221) Fix read timeout issue
    - sched/topology: Don't try to build empty sched domains
    - sched/topology: Allow sched_asym_cpucapacity to be disabled
    - mt76: dma: fix buffer unmap with non-linear skbs
    - drm/amd/display: do not synchronize "drr" displays
    - SUNRPC: The RDMA back channel mustn't disappear while requests are
      outstanding
    - efi: libstub/arm: Account for firmware reserved memory at the base of RAM
    - x86, efi: Never relocate kernel below lowest acceptable address
    - arm64: cpufeature: Enable Qualcomm Falkor errata 1009 for Kryo
    - arm64: apply ARM64_ERRATUM_845719 workaround for Brahma-B53 core
    - arm64: Brahma-B53 is SSB and spectre v2 safe
    - arm64: apply ARM64_ERRATUM_843419 workaround for Brahma-B53 core
    - arm64: errata: Update stale comment
    - net/ibmvnic: unlock rtnl_lock in reset so linkwatch_event can run

* Disco update: upstream stable patchset 2019-11-20 (LP: #1853382)
    - regulator: of: fix suspend-min/max-voltage parsing
    - ASoC: wm8994: Do not register inapplicable controls for WM1811
    - arm64: dts: allwinner: a64: pine64-plus: Add PHY regulator delay
    - arm64: dts: allwinner: a64: sopine-baseboard: Add PHY regulator delay
    - arm64: dts: Fix gpio to pinmux mapping
    - regulator: ti-abb: Fix timeout in ti_abb_wait_txdone/ti_abb_clear_all_txdone
    - ASoC: rt5682: add NULL handler to set_jack function
    - regulator: pfuze100-regulator: Variable "val" in pfuze100_regulator_probe()
      could be uninitialized
    - ASoC: wm_adsp: Don't generate kcontrols without READ flags
    - ASoc: rockchip: i2s: Fix RPM imbalance
    - ARM: dts: logicpd-torpedo-som: Remove twl_keypad
    - pinctrl: ns2: Fix off by one bugs in ns2_pinmux_enable()
    - ARM: mm: fix alignment handler faults under memory pressure
    - scsi: qla2xxx: fix a potential NULL pointer dereference
    - scsi: scsi_dh_alua: handle RTPG sense code correctly during state
      transitions
    - scsi: sni_53c710: fix compilation error
    - scsi: fix kconfig dependency warning related to 53C700_LE_ON_BE
    - ARM: dts: imx7s: Correct GPT's ipg clock source
    - perf c2c: Fix memory leak in build_cl_output()
    - 8250-men-mcb: fix error checking when get_num_ports returns -ENODEV
    - perf kmem: Fix memory leak in compact_gfp_flags()
    - ARM: davinci: dm365: Fix McBSP dma_slave_map entry
    - drm/amdgpu: fix potential VM faults
    - scsi: target: core: Do not overwrite CDB byte 1
    - tracing: Fix "gfp_t" format for synthetic events
    - ARM: 8926/1: v7m: remove register save to stack before svc
    - of: unittest: fix memory leak in unittest_data_add
    - MIPS: bmips: mark exception vectors as char arrays
    - irqchip/gic-v3-its: Use the exact ITSList for VMOVP
    - i2c: stm32f7: fix first byte to send in slave mode
    - i2c: stm32f7: fix a race in slave mode with arbitration loss irq
    - i2c: stm32f7: remove warning when compiling with W=1
    - cifs: Fix cifsInodeInfo lock_sem deadlock when reconnect occurs
    - nbd: protect cmd->status with cmd->lock
    - nbd: handle racing with error'ed out commands
    - cxgb4: fix panic when attaching to ULD fail
    - dccp: do not leak jiffies on the wire
    - erspan: fix the tun_info options_len check for erspan
    - inet: stop leaking jiffies on the wire
    - net: annotate accesses to sk->sk_incoming_cpu
    - net: annotate lockless accesses to sk->sk_napi_id
    - net: dsa: bcm_sf2: Fix IMP setup for port different than 8
    - net: ethernet: ftgmac100: Fix DMA coherency issue with SW checksum
    - net: fix sk_page_frag() recursion from memory reclaim
    - net: hisilicon: Fix ping latency when deal with high throughput
    - net/mlx4_core: Dynamically set guaranteed amount of counters per VF
    - netns: fix GFP flags in rtnl_net_notifyid()
    - net: usb: lan78xx: Disable interrupts before calling generic_handle_irq()
    - selftests: net: reuseport_dualstack: fix uninitalized parameter
    - udp: fix data-race in udp_set_dev_scratch()
    - vxlan: check tun_info options_len properly
    - net: add skb_queue_empty_lockless()
    - udp: use skb_queue_empty_lockless()
    - net: use skb_queue_empty_lockless() in poll() handlers
    - net: use skb_queue_empty_lockless() in busy poll contexts
    - net: add READ_ONCE() annotation in __skb_wait_for_more_packets()
    - ipv4: fix route update on metric change.
    - selftests: fib_tests: add more tests for metric update
    - net/mlx5e: Fix handling of compressed CQEs in case of low NAPI budget
    - r8169: fix wrong PHY ID issue with RTL8168dp
    - net/mlx5e: Fix ethtool self test: link speed
    - net: dsa: b53: Do not clear existing mirrored port mask
    - net: bcmgenet: don't set phydev->link from MAC
    - net: phy: bcm7xxx: define soft_reset for 40nm EPHY
    - net: bcmgenet: reset 40nm EPHY on energy detect
    - net: usb: lan78xx: Connect PHY before registering MAC
    - net: dsa: fix switch tree list
    - r8152: add device id for Lenovo ThinkPad USB-C Dock Gen 2
    - net/flow_dissector: switch to siphash
    - wireless: Skip directory when generating certificates
    - platform/x86: pmc_atom: Add Siemens SIMATIC IPC227E to critclk_systems DMI
      table
    - powerpc/mm: Fixup tlbie vs mtpidr/mtlpidr ordering issue on POWER9
    - selftests/powerpc: Add test case for tlbie vs mtpidr ordering issue
    - selftests/powerpc: Fix compile error on tlbie_test due to newer gcc
    - ASoC: pcm3168a: The codec does not support S32_LE
    - arm64: dts: ti: k3-am65-main: Fix gic-its node unit-address
    - usb: gadget: udc: core: Fix segfault if udc_bind_to_driver() for pending
      driver fails
    - regulator: da9062: fix suspend_enable/disable preparation
    - ASoC: topology: Fix a signedness bug in soc_tplg_dapm_widget_create()
    - pinctrl: intel: Allocate IRQ chip dynamic
    - arm64: dts: rockchip: fix Rockpro64 RK808 interrupt line
    - arm64: dts: rockchip: fix RockPro64 vdd-log regulator settings
    - arm64: dts: rockchip: fix RockPro64 sdhci settings
    - ARM: 8908/1: add __always_inline to functions called from __get_user_check()
    - arm64: dts: rockchip: fix RockPro64 sdmmc settings
    - ARM: dts: vf610-zii-scu4-aib: Specify 'i2c-mux-idle-disconnect'
    - arm64: dts: imx8mq: Use correct clock for usdhc's ipg clk
    - drm/amdgpu: fix error handling in amdgpu_bo_list_create
    - ARM: dts: bcm2837-rpi-cm3: Avoid leds-gpio probing issue
    - ALSA: hda: Add Elkhart Lake PCI ID
    - ALSA: hda: Add Tigerlake/Jasperlake PCI ID
    - irqchip/sifive-plic: Skip contexts except supervisor in plic_init()
    - net: rtnetlink: fix a typo fbd -> fdb
    - net/mlx5: Fix flow counter list auto bits struct
    - net: hns3: fix mis-counting IRQ vector numbers issue
    - net: reorder 'struct net' fields to avoid false sharing
    - net: netem: correct the parent's backlog when corrupted packet was dropped
    - CIFS: Fix retry mid list corruption on reconnects

* Disco update: upstream stable patchset 2019-11-18 (LP: #1853067)
    - dm snapshot: introduce account_start_copy() and account_end_copy()
    - dm snapshot: rework COW throttling to fix deadlock
    - Btrfs: fix inode cache block reserve leak on failure to allocate data space
    - btrfs: qgroup: Always free PREALLOC META reserve in
      btrfs_delalloc_release_extents()
    - f2fs: flush quota blocks after turnning it off
    - drm/msm/dpu: handle failures while initializing displays
    - bcache: fix input overflow to writeback_rate_minimum
    - ath10k: assign 'n_cipher_suites = 11' for WCN3990 to enable WPA3
    - staging: mt7621-pinctrl: use pinconf-generic for 'dt_node_to_map' and
      'dt_free_map'
    - HID: Add ASUS T100CHI keyboard dock battery quirks
    - HID: steam: fix boot loop with bluetooth firmware
    - HID: steam: fix deadlock with input devices.
    - usb: dwc3: gadget: early giveback if End Transfer already completed
    - usb: dwc3: gadget: clear DWC3_EP_TRANSFER_STARTED on cmd complete
    - ALSA: usb-audio: Cleanup DSD whitelist
    - usb: handle warm-reset port requests on hub resume
    - rtc: pcf8523: set xtal load capacitance from DT
    - arm64: Add MIDR encoding for HiSilicon Taishan CPUs
    - arm64: kpti: Whitelist HiSilicon Taishan v110 CPUs
    - mlxsw: spectrum: Set LAG port collector only when active
    - scsi: lpfc: Correct localport timeout duration error
    - CIFS: Respect SMB2 hdr preamble size in read responses
    - cifs: add credits from unmatched responses/messages
    - ALSA: hda/realtek - Apply ALC294 hp init also for S4 resume
    - media: vimc: Remove unused but set variables
    - ext4: disallow files with EXT4_JOURNAL_DATA_FL from EXT4_IOC_SWAP_BOOT
    - net: dsa: mv88e6xxx: Release lock while requesting IRQ
    - PCI/PME: Fix possible use-after-free on remove
    - drm/amd/display: fix odm combine pipe reset
    - power: supply: max14656: fix potential use-after-free
    - iio: adc: meson_saradc: Fix memory allocation order
    - iio: fix center temperature of bmc150-accel-core
    - libsubcmd: Make _FORTIFY_SOURCE defines dependent on the feature
    - perf tests: Avoid raising SEGV using an obvious NULL dereference
    - perf map: Fix overlapped map handling
    - perf script brstackinsn: Fix recovery from LBR/binary mismatch
    - perf jevents: Fix period for Intel fixed counters
    - perf tools: Propagate get_cpuid() error
    - perf annotate: Propagate perf_env__arch() error
    - perf annotate: Fix the signedness of failure returns
    - perf annotate: Propagate the symbol__annotate() error return
    - perf annotate: Return appropriate error code for allocation failures
    - staging: rtl8188eu: fix null dereference when kzalloc fails
    - RDMA/hfi1: Prevent memory leak in sdma_init
    - RDMA/iwcm: Fix a lock inversion issue
    - HID: hyperv: Use in-place iterator API in the channel callback
    - nfs: Fix nfsi->nrequests count error on nfs_inode_remove_request
    - arm64: ftrace: Ensure synchronisation in PLT setup for Neoverse-N1 #1542419
    - tty: serial: owl: Fix the link time qualifier of 'owl_uart_exit()'
    - tty: n_hdlc: fix build on SPARC
    - gpio: max77620: Use correct unit for debounce times
    - fs: cifs: mute -Wunused-const-variable message
    - serial: mctrl_gpio: Check for NULL pointer
    - efi/cper: Fix endianness of PCIe class code
    - efi/x86: Do not clean dummy variable in kexec path
    - MIPS: include: Mark __cmpxchg as __always_inline
    - x86/xen: Return from panic notifier
    - ocfs2: clear zero in unaligned direct IO
    - fs: ocfs2: fix possible null-pointer dereferences in
      ocfs2_xa_prepare_entry()
    - fs: ocfs2: fix a possible null-pointer dereference in
      ocfs2_write_end_nolock()
    - fs: ocfs2: fix a possible null-pointer dereference in
      ocfs2_info_scan_inode_alloc()
    - arm64: armv8_deprecated: Checking return value for memory allocation
    - sched/vtime: Fix guest/system mis-accounting on task switch
    - perf/x86/amd: Change/fix NMI latency mitigation to use a timestamp
    - drm/amdgpu: fix memory leak
    - iio: imu: adis16400: release allocated memory on failure
    - MIPS: include: Mark __xchg as __always_inline
    - MIPS: fw: sni: Fix out of bounds init of o32 stack
    - virt: vbox: fix memory leak in hgcm_call_preprocess_linaddr
    - nbd: fix possible sysfs duplicate warning
    - NFSv4: Fix leak of clp->cl_acceptor string
    - s390/uaccess: avoid (false positive) compiler warnings
    - tracing: Initialize iter->seq after zeroing in tracing_read_pipe()
    - ARM: 8914/1: NOMMU: Fix exc_ret for XIP
    - nbd: verify socket is supported during setup
    - USB: legousbtower: fix a signedness bug in tower_probe()
    - thunderbolt: Use 32-bit writes when writing ring producer/consumer
    - fuse: flush dirty data/metadata before non-truncate setattr
    - fuse: truncate pending writes on O_TRUNC
    - ALSA: bebob: Fix prototype of helper function to return negative value
    - UAS: Revert commit 3ae62a42090f ("UAS: fix alignment of scatter/gather
      segments")
    - USB: gadget: Reject endpoints with 0 maxpacket value
    - usb-storage: Revert commit 747668dbc061 ("usb-storage: Set
      virt_boundary_mask to avoid SG overflows")
    - USB: ldusb: fix ring-buffer locking
    - USB: ldusb: fix control-message timeout
    - usb: xhci: fix __le32/__le64 accessors in debugfs code
    - USB: serial: whiteheat: fix potential slab corruption
    - USB: serial: whiteheat: fix line-speed endianness
    - scsi: target: cxgbit: Fix cxgbit_fw4_ack()
    - HID: i2c-hid: add Trekstor Primebook C11B to descriptor override
    - HID: Fix assumption that devices have inputs
    - HID: fix error message in hid_open_report()
    - nl80211: fix validation of mesh path nexthop
    - s390/cmm: fix information leak in cmm_timeout_handler()
    - s390/idle: fix cpu idle time calculation
    - arm64: Ensure VM_WRITE|VM_SHARED ptes are clean by default
    - dmaengine: qcom: bam_dma: Fix resource leak
    - dmaengine: cppi41: Fix cppi41_dma_prep_slave_sg() when idle
    - drm/amdgpu/powerplay/vega10: allow undervolting in p7
    - NFS: Fix an RCU lock leak in nfs4_refresh_delegation_stateid()
    - batman-adv: Avoid free/alloc race when handling OGM buffer
    - llc: fix sk_buff leak in llc_sap_state_process()
    - llc: fix sk_buff leak in llc_conn_service()
    - rxrpc: Fix call ref leak
    - rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record
    - rxrpc: Fix trace-after-put looking at the put peer record
    - NFC: pn533: fix use-after-free and memleaks
    - bonding: fix potential NULL deref in bond_update_slave_arr
    - net: usb: sr9800: fix uninitialized local variable
    - sch_netem: fix rcu splat in netem_enqueue()
    - ALSA: timer: Simplify error path in snd_timer_open()
    - ALSA: timer: Fix mutex deadlock at releasing card
    - ALSA: usb-audio: DSD auto-detection for Playback Designs
    - ALSA: usb-audio: Update DSD support quirks for Oppo and Rotel
    - ALSA: usb-audio: Add DSD support for Gustard U16/X26 USB Interface
    - powerpc/powernv: Fix CPU idle to be called with IRQs disabled
    - Revert "ALSA: hda: Flush interrupts on disabling"
    - perf annotate: Fix arch specific ->init() failure errors
    - kselftest: exclude failed TARGETS from runlist
    - tty: serial: rda: Fix the link time qualifier of 'rda_uart_exit()'
    - RDMA/cm: Fix memory leak in cm_add/remove_one
    - sched/fair: Scale bandwidth quota and period without losing quota/period
      ratio precision
    - perf/core: Rework memory accounting in perf_mmap()
    - perf/core: Fix corner case in perf_rotate_context()
    - iio: imu: st_lsm6dsx: fix waitime for st_lsm6dsx i2c controller
    - HID: logitech-hidpp: do all FF cleanup in hidpp_ff_destroy()
    - um-ubd: Entrust re-queue to the upper layers
    - ARC: perf: Accommodate big-endian CPU
    - arm64: cpufeature: Enable Qualcomm Falkor/Kryo errata 1003
    - virtio_ring: fix stalls for packed rings
    - rtlwifi: rtl_pci: Fix problem of too small skb->len
    - dmaengine: imx-sdma: fix size check for sdma script_number
    - sched/fair: Fix low cpu usage with high throttling by removing expiration of
      cpu-local slices
    - sched/fair: Fix -Wunused-but-set-variable warnings

* Dell XPS 13 9350/9360 headphone audio hiss (LP: #1654448) // [XPS 13 9360,
    Realtek ALC3246, Black Headphone Out, Front] High noise floor
    (LP: #1845810) // Disco update: upstream stable patchset 2019-11-18
    (LP: #1853067)
    - ALSA: hda/realtek: Reduce the Headphone static noise on XPS 9350/9360

* Disco update: upstream stable patchset 2019-11-13 (LP: #1852459)
    - nvme-pci: Fix a race in controller removal
    - scsi: ufs: skip shutdown if hba is not powered
    - scsi: megaraid: disable device when probe failed after enabled device
    - scsi: qla2xxx: Fix unbound sleep in fcport delete path.
    - ARM: OMAP2+: Fix missing reset done flag for am3 and am43
    - ARM: OMAP2+: Fix warnings with broken omap2_set_init_voltage()
    - ieee802154: ca8210: prevent memory leak
    - ARM: dts: am4372: Set memory bandwidth limit for DISPC
    - net: dsa: qca8k: Use up to 7 ports for all operations
    - MIPS: dts: ar9331: fix interrupt-controller size
    - xen/efi: Set nonblocking callbacks
    - nl80211: fix null pointer dereference
    - mac80211: fix txq null pointer dereference
    - netfilter: nft_connlimit: disable bh on garbage collection
    - net: dsa: rtl8366rb: add missing of_node_put after calling
      of_get_child_by_name
    - mips: Loongson: Fix the link time qualifier of 'serial_exit()'
    - net: hisilicon: Fix usage of uninitialized variable in function
      mdio_sc_cfg_reg_write()
    - lib: textsearch: fix escapes in example code
    - namespace: fix namespace.pl script to support relative paths
    - libata/ahci: Fix PCS quirk application
    - Revert "drm/radeon: Fix EEH during kexec"
    - ocfs2: fix panic due to ocfs2_wq is null
    - ipv4: fix race condition between route lookup and invalidation
    - ipv4: Return -ENETUNREACH if we can't create route but saddr is valid
    - net: avoid potential infinite loop in tc_ctl_action()
    - net: bcmgenet: Fix RGMII_MODE_EN value for GENET v1/2/3
    - net: bcmgenet: Set phydev->dev_flags only for internal PHYs
    - net: i82596: fix dma_alloc_attr for sni_82596
    - net/ibmvnic: Fix EOI when running in XIVE mode.
    - net: ipv6: fix listify ip6_rcv_finish in case of forwarding
    - net: stmmac: disable/enable ptp_ref_clk in suspend/resume flow
    - sctp: change sctp_prot .no_autobind with true
    - USB: legousbtower: fix memleak on disconnect
    - ALSA: hda/realtek - Add support for ALC711
    - ALSA: hda/realtek - Enable headset mic on Asus MJ401TA
    - ALSA: usb-audio: Disable quirks for BOSS Katana amplifiers
    - ALSA: hda - Force runtime PM on Nvidia HDMI codecs
    - usb: udc: lpc32xx: fix bad bit shift operation
    - USB: serial: ti_usb_3410_5052: fix port-close races
    - USB: ldusb: fix memleak on disconnect
    - USB: usblp: fix use-after-free on disconnect
    - USB: ldusb: fix read info leaks
    - MIPS: tlbex: Fix build_restore_pagemask KScratch restore
    - staging: wlan-ng: fix exit return when sme->key_idx >= NUM_WEPKEYS
    - scsi: zfcp: fix reaction on bit error threshold notification
    - scsi: sd: Ignore a failure to sync cache due to lack of authorization
    - scsi: core: save/restore command resid for error handling
    - scsi: core: try to get module before removing device
    - scsi: ch: Make it possible to open a ch device multiple times again
    - Input: da9063 - fix capability and drop KEY_SLEEP
    - Input: synaptics-rmi4 - avoid processing unknown IRQs
    - ASoC: rsnd: Reinitialize bit clock inversion flag for every format setting
    - ACPI: CPPC: Set pcc_data[pcc_ss_id] to NULL in acpi_cppc_processor_exit()
    - cfg80211: wext: avoid copying malformed SSIDs
    - mac80211: Reject malformed SSID elements
    - drm/ttm: Restore ttm prefaulting
    - drm/amdgpu: Bail earlier when amdgpu.cik_/si_support is not set to 1
    - drivers/base/memory.c: don't access uninitialized memmaps in
      soft_offline_page_store()
    - fs/proc/page.c: don't access uninitialized memmaps in fs/proc/page.c
    - mmc: cqhci: Commit descriptors before setting the doorbell
    - mm/memory-failure.c: don't access uninitialized memmaps in memory_failure()
    - mm/slub: fix a deadlock in show_slab_objects()
    - mm/page_owner: don't access uninitialized memmaps when reading
      /proc/pagetypeinfo
    - hugetlbfs: don't access uninitialized memmaps in pfn_range_valid_gigantic()
    - mm/memory-failure: poison read receives SIGKILL instead of SIGBUS if mmaped
      more than once
    - xtensa: drop EXPORT_SYMBOL for outs*/ins*
    - parisc: Fix vmap memory leak in ioremap()/iounmap()
    - EDAC/ghes: Fix Use after free in ghes_edac remove path
    - arm64: Enable workaround for Cavium TX2 erratum 219 when running SMT
    - CIFS: avoid using MID 0xFFFF
    - CIFS: Fix use after free of file info structures
    - perf/aux: Fix AUX output stopping
    - tracing: Fix race in perf_trace_buf initialization
    - dm cache: fix bugs when a GFP_NOWAIT allocation fails
    - x86/boot/64: Make level2_kernel_pgt pages invalid outside kernel area
    - x86/apic/x2apic: Fix a NULL pointer deref when handling a dying cpu
    - pinctrl: cherryview: restore Strago DMI workaround for all versions
    - pinctrl: armada-37xx: fix control of pins 32 and up
    - pinctrl: armada-37xx: swap polarity on LED group
    - btrfs: block-group: Fix a memory leak due to missing btrfs_put_block_group()
    - Btrfs: add missing extents release on file extent cluster relocation error
    - Btrfs: check for the full sync flag while holding the inode lock during
      fsync
    - btrfs: tracepoints: Fix bad entry members of qgroup events
    - memstick: jmb38x_ms: Fix an error handling path in 'jmb38x_ms_probe()'
    - cpufreq: Avoid cpufreq_suspend() deadlock on system shutdown
    - xen/netback: fix error path of xenvif_connect_data()
    - PCI: PM: Fix pci_power_up()
    - blk-rq-qos: fix first node deletion of rq_qos_del()
    - RDMA/cxgb4: Do not dma memory off of the stack
    - drm: Clear the fence pointer when writeback job signaled
    - clk: ti: dra7: Fix mcasp8 clock bits
    - ARM: dts: Fix wrong clocks for dra7 mcasp
    - scsi: qla2xxx: Fix N2N link reset
    - scsi: qla2xxx: Fix N2N link up fail
    - ARM: dts: Fix gpio0 flags for am335x-icev2
    - ARM: OMAP2+: Add missing LCDC midlemode for am335x
    - nvme-tcp: fix wrong stop condition in io_work
    - nvme-pci: Save PCI state before putting drive into deepest state
    - nvme: fix an error code in nvme_init_subsystem()
    - nvme-rdma: Fix max_hw_sectors calculation
    - Added QUIRKs for ADATA XPG SX8200 Pro 512GB
    - nvme-rdma: fix possible use-after-free in connect timeout
    - blk-mq: honor IO scheduler for multiqueue devices
    - loop: change queue block size to match when using DIO
    - drm/amdgpu: fix multiple memory leaks in acp_hw_init
    - drm/amd/display: memory leak
    - s390/mm: fix -Wunused-but-set-variable warnings
    - net: phy: fix write to mii-ctrl1000 register
    - Convert filldir[64]() from __put_user() to unsafe_put_user()
    - elf: don't use MAP_FIXED_NOREPLACE for elf executable mappings
    - Make filldir[64]() verify the directory entry filename is valid
    - uaccess: implement a proper unsafe_copy_to_user() and switch filldir over to
      it
    - filldir[64]: remove WARN_ON_ONCE() for bad directory entries
    - rxrpc: Fix possible NULL pointer access in ICMP handling
    - sched: etf: Fix ordering of packets with same txtime
    - net: aquantia: correctly handle macvlan and multicast coexistence
    - net: phy: micrel: Discern KSZ8051 and KSZ8795 PHYs
    - net: phy: micrel: Update KSZ87xx PHY name
    - netdevsim: Fix error handling in nsim_fib_init and nsim_fib_exit
    - rxrpc: use rcu protection while reading sk->sk_user_data
    - binder: Don't modify VMA bounds in ->mmap handler
    - drm/amdgpu/vce: fix allocation size in enc ring test
    - drm/amdgpu/vcn: fix allocation size in enc ring test
    - drm/amdgpu/uvd6: fix allocation size in enc ring test (v2)
    - drm/amdgpu/uvd7: fix allocation size in enc ring test (v2)
    - mmc: mxs: fix flags passed to dmaengine_prep_slave_sg
    - mmc: sdhci-omap: Fix Tuning procedure for temperatures < -20C
    - mm/memunmap: don't access uninitialized memmap in memunmap_pages()
    - zram: fix race between backing_dev_show and backing_dev_store
    - s390/zcrypt: fix memleak at release
    - fs/dax: Fix pmd vs pte conflict detection
    - x86/hyperv: Make vapic support x2apic mode
    - btrfs: tracepoints: Fix wrong parameter order for qgroup events
    - ceph: just skip unrecognized info in ceph_reply_info_extra
    - opp: of: drop incorrect lockdep_assert_held()

* Colour banding in Lenovo G50-80 laptop display (i915) (LP: #1819968) //
    Disco update: upstream stable patchset 2019-11-13 (LP: #1852459)
    - drm/edid: Add 6 bpc quirk for SDC panel in Lenovo G50

-- Khalid Elmously <khalid.elmously@canonical.com>  Mon, 02 Dec 2019 14:25:23 -0500

Changed in linux (Ubuntu Disco):
status:	Fix Committed → Fix Released

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[Regression] Failed to boot disco kernel built from master-next (kernel kernel NULL pointer dereference)

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