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Bug#638631: Crash following repeated 'page allocation failure' & 'BUG: soft lockup'



On Sat, 2011-08-20 at 12:44 +0100, Richard Kettlewell wrote:
> Package: linux-image-3.0.0-1-686-pae
> Version: 3.0.0-1

Please use reportbug in future.

> My sid KVM guest crashed yesterday.

Not actually a crash, but a hang is just as bad (maybe worse).

> The emulated screen was blank and 
> did not respond to any input.  The kernel log is full of messages as 
> shown below.  They almost all name the same executable, apache_accesses 
> (from package munin-node) and have the same backtraces, but are 
> different PIDs (it is not a long-running process).
> 
> The exception is a "BUG: soft lockup - CPU#0 stuck for 35s!" message, 
> also below.
> 
> The guest is a news server, with around a kilobyte/second of network 
> traffic going into it at all times.
> 
> The guest has 512MB RAM assigned.  It has a gigabyte of swap available 
> and doesn't seem to have been using much of it.
[...]

That does sound wrong.

Could it be that the host is slow to service the guest's disk I/O?

Ben.

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