[Bug 2001975] Autopkgtest regression report (glibc/2.31-0ubuntu9.12)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted glibc (2.31-0ubuntu9.12) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

aevol/5.0+ds-1build1 (arm64)
c-icap/1:0.5.3-3 (armhf)
cysignals/1.10.2+ds-4 (s390x)
dbus/1.12.16-2ubuntu2.3 (armhf)
docker.io/20.10.21-0ubuntu1~20.04.2 (amd64, arm64, ppc64el, s390x)
flatpak/1.6.5-0ubuntu0.4 (ppc64el)
kholidays/1:5.68.0-0ubuntu1 (armhf)
kplotting/5.68.0-0ubuntu1 (armhf)
libimage-sane-perl/5-1 (arm64)
libreoffice/1:6.4.7-0ubuntu0.20.04.8 (armhf)
libxml-libxslt-perl/1.99-1 (s390x)
libxml-quote-perl/1.02-4build2 (s390x)
linux-aws-5.15/5.15.0-1041.46~20.04.1 (arm64)
linux-gcp-5.15/5.15.0-1039.47~20.04.1 (arm64)
linux-lowlatency-hwe-5.15/5.15.0-79.88~20.04.1 (arm64)
mariadb-10.3/1:10.3.38-0ubuntu0.20.04.1 (armhf)
postgresql-12/12.15-0ubuntu0.20.04.1 (amd64)
r-bioc-delayedarray/0.12.2+dfsg-1 (armhf)
r-cran-curl/4.3+dfsg-1 (armhf)
systemd/245.4-4ubuntu3.22 (arm64)
threadweaver/5.68.0-0ubuntu1 (amd64)
utox/0.17.1-1 (arm64)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/focal/update_excuses.html#glibc

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/2001975

Title:
  overflow bug in wcsncmp_avx2

Status in GLibC:
  Fix Released
Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  See https://sourceware.org/bugzilla/show_bug.cgi?id=28755

  Note that we're only impacted by the avx2 issue, the evex-optimized
  version isn't present in the 2.31 branch.

  [Test case]

  > test_wcsncmp.c cat <<EOF
  #include <wchar.h>
  #include <assert.h>

  int
  main(int argc, char ** argv) {
      assert(__wcsncmp_avx2(L"abc", L"abd", (1UL << 62)) != 0);
  }
  EOF
  gcc -static -o test_wcsncmp test_wcsncmp.c
  ./test_scsncmp

  [Regression potential]

  The patch is contained within the AVX-2 optimized routine, but it
  could still cause introduce a new bug there. In addition, we could see
  performance regressions.

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