kernel-packages team mailing list archive

[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-trusty

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

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https://bugs.launchpad.net/bugs/1543980

Title:
  Kernel 3.13.0-77 crashes (can be triggered by Samba)

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  Ubuntu 14.04.3 LTS

  After updating to kernel 3.13.0-77 system crashes.
  First, network dies, then the whole system.
  There are several kernel crashes in the logs.

  --- snip ---
  ProblemType: KernelOops
  Annotation: Your system might become unstable now and might need to be restarted.
  Date: Wed Feb 10 09:20:35 2016
  Failure: oops
  OopsText:
   BUG: soft lockup - CPU#1 stuck for 23s! [smbd:5908]
  --- snap ---

  Followed by kernel stack traces.

  After some investigation, it turned out that the crash can be triggered by Samba.
  It's easily reproducible by running the following commands in the Samba master branch:
  ./configure.developer
  TDB_NO_FSYNC=1 make -j test FAIL_IMMEDIATELY=1 SOCKET_WRAPPER_KEEP_PCAP=1 TESTS="samba3.raw.composite"

  Downgrading to kernel 3.13.0-76 solves this problem.

  Please let me know if we can provide more information or help testing.

  Thanks!

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