Comment 77 for bug 1778844

------- Comment From <email address hidden> 2019-06-25 10:14 EDT-------
I tried this on a witherspoon with NVMe, but I believe I also hit LP 1778844:

ubuntu@tempbmc1-p1:~$ [ 116.427517] sysrq: SysRq : Trigger a crash
[ 116.427566] Unable to handle kernel paging request for data at address 0x00000000
[ 116.427619] Faulting instruction address: 0xc0000000008205b8
[ 116.427668] Oops: Kernel access of bad area, sig: 11 [#1]
[ 116.427762] LE SMP NR_CPUS=2048 NUMA PowerNV
[ 116.427838] Modules linked in: vmx_crypto crct10dif_vpmsum nouveau ast ttm drm_kms_helper drm at24 ofpart drm_panel_orientation_quirks fb_sys_fops syscopyarea cmdlinepart sysfillrect ipmi_powernv sysimgblt powernv_flash ipmi_devintf i2c_algo_bit ibmpowernv mtd ipmi_msghandler opal_prd uio_pdrv_genirq uio sch_fq_codel ip_tables x_tables autofs4 nvme crc32c_vpmsum nvme_core ahci tg3 libahci
[ 116.428241] CPU: 80 PID: 5322 Comm: bash Kdump: loaded Not tainted 4.18.0-24-generic #25-Ubuntu
[ 116.428366] NIP: c0000000008205b8 LR: c000000000821444 CTR: c000000000820590
[ 116.428464] REGS: c00020393dc5fa00 TRAP: 0300 Not tainted (4.18.0-24-generic)
[ 116.428581] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 28422228 XER: 20040000
[ 116.428675] CFAR: c000000000821440 DAR: 0000000000000000 DSISR: 42000000 IRQMASK: 0
[ 116.428675] GPR00: c000000000821444 c00020393dc5fc80 c00000000177ca00 0000000000000063
[ 116.428675] GPR04: 0000000000000001 00000000000004f1 9000000000009033 0000000035c80060
[ 116.428675] GPR08: 0000000000000007 0000000000000001 0000000000000000 9000000000001003
[ 116.428675] GPR12: c000000000820590 c000203fff652480 00000dda71119760 0000000000000000
[ 116.428675] GPR16: 00000dda7bd4d910 00000dda710b4a48 00000dda71119760 00000dda71038b00
[ 116.428675] GPR20: 0000000000000000 0000000000000001 00000dda710c70b8 00007fffd6124ea4
[ 116.428675] GPR24: 00007fffd6124ea0 00000dda7111afe4 0000718ed556bfa8 c0000000016736b0
[ 116.428675] GPR28: 0000000000000004 0000000000000002 0000000000000063 c0000000015f2e38
[ 116.429616] NIP [c0000000008205b8] sysrq_handle_crash+0x28/0x30
[ 116.429708] LR [c000000000821444] __handle_sysrq+0xf4/0x230
[ 116.429792] Call Trace:
[ 116.429843] [c00020393dc5fc80] [c000000000821428] __handle_sysrq+0xd8/0x230 (unreliable)
[ 116.429976] [c00020393dc5fd10] [c000000000821bc8] write_sysrq_trigger+0x68/0x90
[ 116.430099] [c00020393dc5fd40] [c0000000004a99a4] proc_reg_write+0x84/0xc0
[ 116.430202] [c00020393dc5fd70] [c0000000003f992c] __vfs_write+0x3c/0x70
[ 116.430305] [c00020393dc5fd90] [c0000000003f9bc8] vfs_write+0xd8/0x220
[ 116.430407] [c00020393dc5fde0] [c0000000003f9f44] ksys_write+0x64/0x110
[ 116.430512] [c00020393dc5fe30] [c00000000000b288] system_call+0x5c/0x70
[ 116.430605] Instruction dump:
[ 116.430649] 4bfff9e1 4bfffe44 3c4c00f6 3842c470 7c0802a6 60000000 39200001 3d42001d
[ 116.430760] 394a90f0 912a0000 7c0004ac 39400000 <992a0000> 4e800020 3c4c00f6 3842c440
[ 116.430867] ---[ end trace 4f8cfae97c893934 ]---
[ 116.534209]
[ 116.534308] Sending IPI to othe

Looks like that might be blocking this one, I will get that mirrored over, too.

------- Comment From <email address hidden> 2019-06-25 10:16 EDT-------
Sorry, previous comment should have said hitting LP 1832388.