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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux-lts-trusty (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key regression-update trusty

** Package changed: linux-lts-trusty (Ubuntu) => linux (Ubuntu)

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Trusty)
       Status: New => Confirmed

** Tags added: needs-bisect

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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:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

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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