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27 March 2024, 02:37:15 UTC
Revision ff497452636f4687e517964817b7e2bd99f4b44b authored by Linus Torvalds on 30 August 2013, 00:02:48 UTC, committed by Linus Torvalds on 30 August 2013, 00:02:48 UTC 
Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
 
Pull workqueue fix from Tejun Heo:
 "This contains one fix which could lead to system-wide lockup on
  !PREEMPT kernels.  It's very late in the cycle but this definitely is
  a -stable material.

  The problem is that workqueue worker tasks may process unlimited
  number of work items back-to-back without every yielding inbetween.
  This usually isn't noticeable but a work item which re-queues itself
  waiting for someone else to do something can deadlock with
  stop_machine.  stop_machine will ensure nothing else happens on all
  other cpus and the requeueing work item will reqeueue itself
  indefinitely without ever yielding and thus preventing the CPU from
  entering stop_machine.

  Kudos to Jamie Liu for spotting and diagnosing the problem.  This can
  be trivially fixed by adding cond_resched() after processing each work
  item"

* 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: cond_resched() after processing each work item
2 parent s 06a557f + b22ce27
History
Tip revision: ff497452636f4687e517964817b7e2bd99f4b44b authored by Linus Torvalds on 30 August 2013, 00:02:48 UTC
Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Tip revision: ff49745
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