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[dm-devel] Re: INFO: task mount:11202 blocked for more than 120 seconds



David Chinner wrote:
>>> Also, the iolock can be held across I/O so it's possible you've lost an 
>>> I/O. Any I/O errors in the syslog?
>> No, no I/O errors at all. See the kern.log above, I could even do dd(1) 
>> from the md1 (dm-crypt on raid1), no errors either.
> 
> Oh, dm-crypt. Well, I'd definitely start looking there. XFS has a
> history of exposing dm-crypt bugs, and these hangs appear to be I/O
> congestion/scheduling related and not XFS. Also, we haven't changed
> anything related to plug/unplug of block devices in XFS recently, so
> that also points to some other change as well...

Yes, there is bug in dm-crypt...
Please try if the patch here helps: http://lkml.org/lkml/2008/3/14/71

Thanks,
Milan
--
mbroz redhat com


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