kernel-packages team mailing list archive

[Philipp Hahn <hahn@xxxxxxxxxxxxx>]

Hello,

Am 23.02.2016 um 08:34 schrieb Stefan Metzmacher:
> https://forge.univention.org/bugzilla/show_bug.cgi?id=40558#c11
> 
> Indicates that commit
> 51cd3ed4c41b3895869925b99dd95a704bd2c91a unix: avoid use-after-free in ep_remove_wait_queue
> should be reverted in order to avoid this regression.
> 
> Can we please get some progress on this?

Rainer Weikusat sent a patch named
 [PATCH net] af_unix: Guard against other == sk in unix_dgram_sendmsg
 <https://patchwork.ozlabs.org/patch/582017/>
which fixes the problem.


For our distribution we released chose to revert the original patch as
we needed a working kernel as fast as possible, as several of our
customers were hit by that bug.

I tested the patch from Rainer and it also made the bug disappear.
David Miller also picked the patch for stable and we will do the same
when next be build a new kernel for our release.

Philipp

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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:
  Triaged

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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