[Bug 2101149] Autopkgtest regression report (libtraceevent/1:1.8.2-1ubuntu2.1)

[Ubuntu SRU Bot]

*** This bug is a duplicate of bug 2062118 ***
    https://bugs.launchpad.net/bugs/2062118

All autopkgtests for the newly accepted libtraceevent (1:1.8.2-1ubuntu2.1) for noble have finished running.
The following regressions have been reported in tests triggered by the package:

libtracefs/1.8.0-1ubuntu1 (arm64)
linux-azure-6.11/6.11.0-1012.12~24.04.1 (amd64, arm64)
linux-hwe-6.11/6.11.0-24.24~24.04.1 (amd64, arm64, s390x)
linux-lowlatency-hwe-6.11/6.11.0-1011.12~24.04.1 (amd64, arm64)
linux-nvidia/6.8.0-1026.29 (arm64)
linux-nvidia-lowlatency/6.8.0-1024.27.1 (arm64)
linux-realtime/6.8.1-1015.16 (amd64)
linux-xilinx/6.8.0-1014.15 (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/noble/update_excuses.html#libtraceevent

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

Thank you!

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https://bugs.launchpad.net/bugs/2101149

Title:
  [SRU] Set default file_bigendian in struct tep_handle

Status in libtraceevent package in Ubuntu:
  In Progress
Status in libtraceevent source package in Noble:
  Fix Committed
Status in libtraceevent source package in Oracular:
  Fix Committed

Bug description:
  [ Impact ]

   * This relates to https://bugs.launchpad.net/ubuntu/+source/libtracefs/+bug/2062118.
     The failures on s390x are primarily because tep_alloc sets file
     endianness to LITTLE_ENDIAN by default (with no checks)

   * The changes are already accepted into plucky and upstream:
     https://code.launchpad.net/~r41k0u/ubuntu/+source/libtraceevent/+git/libtraceevent/+merge/477042

   * This will fix autopkgtest segfaults of libtracefs on oracular and
  noble for s390x.

  [ Test Plan ]

   * Clone libtracefs (oracular-devel or noble-devel), compile it and the tests (make && make test),
     then run the tests as root (utest/trace-utest), on an s390x machine (running oracular or noble)

   * You can test the fix by installing the patched version of libtraceevent for the release you are
     testing and trying the libtracefs tests again.

  [ Where problems could occur ]

   * This is not likely to break anything, as we can make a safe assumption
     to set file_bigendian to the same value as host_bigendian by default.
     If these are different, the user can set it using event-parse-api

   * In any case, this change seems logical. This does not affect any other
     little-endian architectures, and I think this won't be breaking any workarounds
     people did around this problem.

   * But in case we have some regressions as a result of this change, then there surely would
     be some workaround to this in a patch, which can then be reverted.

  [ Other Info ]

   * This does not fix anything in libtraceevent but does fix the tests for libtracefs on s390x.
     But I have opened this bug against libtraceevent.

   * I see a workaround around this problem in the last patch in d/p/series, but this change does not affect
     it

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