glibc 2.23-0ubuntu11 ADT test failure with linux 4.4.0-149.175

Failed testcases:

FAIL: debug/tst-backtrace5
FAIL: nptl/tst-cancel24
FAIL: nptl/tst-cancelx16
FAIL: nptl/tst-cancelx18
FAIL: nptl/tst-cancelx20
FAIL: nptl/tst-cancelx21
FAIL: nptl/tst-cancelx4
FAIL: nptl/tst-cancelx5
FAIL: nptl/tst-cond25
FAIL: nptl/tst-cond8
FAIL: nptl/tst-cond8-static
FAIL: nptl/tst-mutex8
FAIL: nptl/tst-mutex8-static
FAIL: nptl/tst-mutexpi8
FAIL: nptl/tst-mutexpi8-static
FAIL: nptl/tst-oncex3
FAIL: nptl/tst-oncex4

This might me related to the issue reported on bug 1805154, which would be a a regression in the vdso caused by 379d98ddf41344273d9718556f761420f4dc80b3 "x86: vdso: Use $LD instead of $CC to link". This commit has been applied to xenial as part of upstream stable update 4.4.179.

Confirmed to be caused by:

commit 379d98ddf41344273d9718556f761420f4dc80b3
Author: Alistair Strachan <email address hidden>
Date: Fri Aug 3 10:39:31 2018 -0700

    x86: vdso: Use $LD instead of $CC to link

And fixed by:

commit cd01544a268ad8ee5b1dfe42c4393f1095f86879
Author: Alistair Strachan <email address hidden>
Date: Fri Dec 14 14:36:37 2018 -0800

    x86/vdso: Pass --eh-frame-hdr to the linker

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-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

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!

ADT glibc testcases are now successful:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/g/glibc/20190530_100415_f7174@/log.gz

This bug was fixed in the package linux - 4.4.0-150.176

---------------
linux (4.4.0-150.176) xenial; urgency=medium

  * linux: 4.4.0-150.176 -proposed tracker (LP: #1830941)

  * glibc 2.23-0ubuntu11 ADT test failure with linux 4.4.0-149.175
    (LP: #1830890)
    - x86/vdso: Pass --eh-frame-hdr to the linker

linux (4.4.0-149.175) xenial; urgency=medium

  * linux: 4.4.0-149.175 -proposed tracker (LP: #1829209)

  * disable a.out support (LP: #1818552)
    - [Config] Disable a.out support

  * autopkgtests run too often, too much and don't skip enough (LP: #1823056)
    - [Debian] Set +x on rebuild testcase.
    - [Debian] Skip rebuild test, for regression-suite deps.
    - [Debian] Make ubuntu-regression-suite skippable on unbootable kernels.
    - [Debian] make rebuild use skippable error codes when skipping.
    - [Debian] Only run regression-suite, if requested to.

  * Xenial update: 4.4.179 upstream stable release (LP: #1828420)
    - arm64: debug: Don't propagate UNKNOWN FAR into si_code for debug signals
    - arm64: debug: Ensure debug handlers check triggering exception level
    - ext4: cleanup bh release code in ext4_ind_remove_space()
    - lib/int_sqrt: optimize initial value compute
    - tty/serial: atmel: Add is_half_duplex helper
    - mm: mempolicy: make mbind() return -EIO when MPOL_MF_STRICT is specified
    - i2c: core-smbus: prevent stack corruption on read I2C_BLOCK_DATA
    - Bluetooth: Fix decrementing reference count twice in releasing socket
    - tty/serial: atmel: RS485 HD w/DMA: enable RX after TX is stopped
    - CIFS: fix POSIX lock leak and invalid ptr deref
    - h8300: use cc-cross-prefix instead of hardcoding h8300-unknown-linux-
    - tracing: kdb: Fix ftdump to not sleep
    - gpio: gpio-omap: fix level interrupt idling
    - sysctl: handle overflow for file-max
    - enic: fix build warning without CONFIG_CPUMASK_OFFSTACK
    - mm/cma.c: cma_declare_contiguous: correct err handling
    - mm/page_ext.c: fix an imbalance with kmemleak
    - mm/vmalloc.c: fix kernel BUG at mm/vmalloc.c:512!
    - mm/slab.c: kmemleak no scan alien caches
    - ocfs2: fix a panic problem caused by o2cb_ctl
    - f2fs: do not use mutex lock in atomic context
    - fs/file.c: initialize init_files.resize_wait
    - cifs: use correct format characters
    - dm thin: add sanity checks to thin-pool and external snapshot creation
    - cifs: Fix NULL pointer dereference of devname
    - fs: fix guard_bio_eod to check for real EOD errors
    - tools lib traceevent: Fix buffer overflow in arg_eval
    - usb: chipidea: Grab the (legacy) USB PHY by phandle first
    - scsi: core: replace GFP_ATOMIC with GFP_KERNEL in scsi_scan.c
    - coresight: etm4x: Add support to enable ETMv4.2
    - ARM: 8840/1: use a raw_spinlock_t in unwind
    - mmc: omap: fix the maximum timeout setting
    - e1000e: Fix -Wformat-truncation warnings
    - IB/mlx4: Increase the timeout for CM cache
    - scsi: megaraid_sas: return error when create DMA pool failed
    - perf test: Fix failure of 'evsel-tp-sched' test on s390
    - SoC: imx-sgtl5000: add missing put_device()
    - media: sh_veu: Correct return type for mem2mem buffer helpers
    - media: s5...

glibc in eoan building against the supposedly-fixed kernel is hitting these issues again on i386 testsuites. Did we break it again?

https://launchpad.net/ubuntu/+source/glibc/2.29-0ubuntu3