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[Ioanna Alifieraki <1921403@xxxxxxxxxxxxxxxxxx>]

VERIFICATION FOCAL

Installed makedumpfile from proposed.
Testing on a Focal machine running 5.11 kernel.

# uname -rv
5.11.0-40-generic #44~20.04.1-Ubuntu SMP Wed Oct 20 19:04:34 UTC 2021

Trigger crash:
# echo 1 > /proc/sys/kernel/sysrq 
# echo c > /proc/sysrq-trigger

After reboot contents of /var/crash :
/var/crash/202110271414# ls
dmesg.202110271414  dump.202110271414

dmesg file has been successfully created.

** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal

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https://bugs.launchpad.net/bugs/1921403

Title:
  makedumpfile does not create dmesg file in /var/crash on 5.10+ kernels

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Focal:
  Fix Committed
Status in makedumpfile source package in Hirsute:
  Fix Released
Status in makedumpfile package in Debian:
  Fix Released

Bug description:
  [IMPACT]
  makedumpfile does not create the dmesg.<timestamp> in /var/crash.
  This happens only on 5.10+ kernel because 5.10 kernel introduces a new
  lockless ringbuffer.

  This issue has been addressed upstream with commits :
  [1] c617ec633392([PATCH 1/2] printk: add support for lockless ringbuffer)
  [2] 44b073b7ec46([PATCH 2/2] printk: use committed/finalized state values)

  [TEST CASE]

  For testing a machine running focal with the 5.11 kernel is required.
  Then trigger a crash.
  After reboot make sure that dmesg.<timestamp> file is created in /var/crash/<timestamp>

  [WHERE PROBLEMS COULD OCCUR]

  Any problems would involve the dmesg file not created.

  [Other]

  [1] https://github.com/makedumpfile/makedumpfile/commit/c617ec63339222f3a44d73e36677a9acc8954ccd
  [2] https://github.com/makedumpfile/makedumpfile/commit/44b073b7ec467aee0d7de381d455b8ace1199184

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