[Bug 1853193] Re: copy_file_range test fails with linux 5.3+ on bionic

[Steve Langasek]

Hello Thadeu, or anyone else affected,

Accepted glibc into bionic-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/glibc/2.27-3ubuntu1.3
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-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. 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.

** Changed in: glibc (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1853193

Title:
  copy_file_range test fails with linux 5.3+ on bionic

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

Bug description:
  [Impact]
  When tested against newer versions of linux, glibc tests will fail as it makes some assumptions about supportead features on the kernel.

  [Fix]
  Do not run the test that checks that copy_file_range will fail with EXDEV when done across devices.

  [Test case]
  Build glibc and run its tests on linux 5.3.

  [Regression potential]
  The same test is being ignored right now, we risk ignoring a failure on an older version of linux, like 4.15. However, that could happen because the feature is backported to said kernel. And we are currently ignoring the failure anyway.

  ===================================

  copy_file_range on linux 5.3 now works across devices, so EXDEV is not
  returned anymore on those cases. glibc, however, tests that is the
  case and its autopkgtest fails, then, when running on linux 5.3.

  glibc 2.30 does not fail in that case anymore, so eoan glibc works
  fine on linux 5.3. However, the change on glibc 2.30 was to remove its
  userspace emulation entirely, and require users to fallback on their
  own.

  https://sourceware.org/bugzilla/show_bug.cgi?id=24744

  Linux commit 5dae222a5ff0c269730393018a5539cc970a4726.

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