[Bug 1951033] Please test proposed package

[Brian Murray]

Hello Michael, or anyone else affected,

Accepted glibc into focal-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.5
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/1951033

Title:
  20.04 SRU

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

Bug description:
  [impact]
  It is time to update glibc in Focal. This bug is a placeholder for the overall process and a place to link the individual bugs that are being targeted:

   bug #1928508 Performance regression on memcpy() calls for AMD Zen
   bug #1899800 Runtime deadlock: pthread_cond_signal failed to wake up pthread_cond_wait due to a bug in undoing stealing
   bug #1892825 update-locale not perform correctly sanity checks
   bug #1918035 ld-2.31.so is not correctly packaged in libc6-dbg
   bug #1951032 AArch64: Backport memcpy improvements

  [test case]
  Each bug listed above has its own test case, of course. And glibc's own test case and the autopkgtests provide a good deal of assurance that things are working. But there are still some additional things we should test by hand.

  1. We should test upgrades interactively in a container and vm and make sure long running processes still function so you can still ssh in and a desktop session continues to operate as expected, ideally on a variety of architectures.
  2. We should build a core20 snap with the glibc from focal-proposed into a branch and test it with a variety of core20 snaps, on a variety of architectures.
  3. For arm64 specifically, we should test that upgrades of machines that do and do not have libc6-lse from 2.31-0ubuntu9.2 installed go smoothly.
  4. We should create a system that has the problematic 2.31-0ubuntu9.3 installed, and check that the behaviour when the new version is available is sensible (the current plan is to refuse such upgrades but I think some more testing here is sensible -- it may be that such upgrades are actually OK).
  5. We should test graphical snaps with a variety of drivers (needs expansion!)

  [regression potential]
  Rebuilding glibc is always a little risky (toolchain bugs and incompatibilities between the old and new versions can be surprising).

  glibc's own tests and the autopkgtests that will be run should catch
  any regression in the new version of glibc itself.

  However, the biggest source of problems recently has been around
  upgrades and interactions between the old and new libcs, whether that
  is different versions of libc6 in a snap and its base or when an long
  running process has the older version mapped but interacts with
  artefacts from the newer version on disk. The tests in this bug are
  aimed at catching any of these problems before it gets to updates.

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