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Bug#516374: INFO: task * blocked for more than 120 seconds. in numerous non-SCHED_IDLE workloads



On Thu, 2009-09-03 at 10:14 +0200, Darck wrote:
> Hi,
> 
> Still no news about this problem ?...
> 
> While upgrading to a newer (unstable) kernel is easy with kernels  
> provided by Debian, this is not the case with the Xen support.
> 
> The 2.6.26-2 xen release is NOT useable in production environment, and  
> keep crashing the host due to this scheduler bug.

This bug report is about systems that are *not* making use of
SCHED_IDLE, which are probably not due to the known scheduler bug.  This
particular error message typically indicates a lock ordering bug or
infinite delay while holding a lock, and can be caused by any kernel
component.

One such case was fixed in version 2.6.26-16:

  * Fix soft lockups caused by one md resync blocking on another due
    to sharing the same device (closes: #514627)

Ben.

-- 
Ben Hutchings
Life is what happens to you while you're busy making other plans.
                                                               - John Lennon

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