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[Ubuntu Kernel Bot <2009442@xxxxxxxxxxxxxxxxxx>]

This bug is awaiting verification that the linux-kvm/5.4.0-1091.97
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-focal' to 'verification-done-focal'. If the
problem still exists, change the tag 'verification-needed-focal' to
'verification-failed-focal'.

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: kernel-spammed-focal-linux-kvm verification-needed-focal

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https://bugs.launchpad.net/bugs/2009442

Title:
  glibc fails for bionic-kvm 4.15.0-1136.141

Status in autopkgtest package in Ubuntu:
  Invalid
Status in linux-kvm package in Ubuntu:
  Invalid
Status in autopkgtest source package in Bionic:
  Invalid
Status in linux-kvm source package in Bionic:
  Fix Committed
Status in autopkgtest source package in Focal:
  Invalid
Status in linux-kvm source package in Focal:
  Fix Committed

Bug description:
  SRU Justification:

  [Impact]
  bionic linux-kvm failure https://autopkgtest.ubuntu.com/results/autopkgtest-bionic/bionic/amd64/g/glibc/20230213_154436_b51c9@/log.gz

  From logs
  FAIL: misc/tst-bz21269
  original exit status 1
  error: ../sysdeps/unix/sysv/linux/i386/tst-bz21269.c:55: not true: syscall (SYS_modify_ldt, 1, ptr, bytecount) == 0
  error: 1 test failures

  Syscall modify_ldt is not enabled because CONFIG_MODIFY_LDT_SYSCALL=n
  for bionic-kvm, even though generic and newer versions (even kvm
  derivativatives) have it enabled.

  [Fix]
  Custom patch to bionic-kvm to enable CONFIG_MODIFY_LDT_SYSCALL

  [Test Plan]
  Before the fix, autopkgtest for glibc will fail with 
  +---------------------------------------------------------------------+
  |     Encountered regressions that don't match expected failures.     |
  +---------------------------------------------------------------------+
  FAIL: misc/tst-bz21269

  After the fix, it should pass

  [Where problems could occur]
  Regression probability is pretty low, we are adding functionality not previously present but looking at focal,jammy this test was fine.

  Note: Not sure why this was not enabled for bionic-kvm, even though
  newer versions of linux kvm has it enabled.

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