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[Bug 1543980] Re: Kernel 3.13.0-77 crashes (can be triggered by Samba)


Thanks Philipp!

I just hope to trigger some reaction from the ubuntu maintainers
in order get a usable kernel more than two week after breaking it.

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

Status in linux package in Ubuntu:
Status in linux source package in Trusty:

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
   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:
  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.


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