Re: BUG: xfs on linux lvm - lvconvert random hungs when doing i/o

[Stanislaw Gruszka <stf_xl@wp.pl>]

On Tuesday 25 March 2008, David Chinner wrote:
> That points to I/O not completing (not an XFS problem at all), or
> the filesystem freeze is just taking a long time to run (as it has
> to sync everything to disk). Given that this is a snapshot target,
> writing new blocks will take quite some time. Is the system still
> making writeback  progress when in this state, or is it really hung?
That is real deadlock, operations which normally takes  few minutes,
hangs for few hours until I restart machine.

This bug is very strange because I can't  catch it with more verbose
debug and tracing options,

I did more tests without debugging options and looks that version from
sgi cvs (2.6.25-rc3) works well. I did also test with two patches you suggest,
applied (with some troubles) for 2.6.24.2,  but finally  things hung after
2 days  - better than without patches, as you expected.

So, looks things are fixed in sgi cvs repository. Don't know if these are
xfs or other subsystem (device-mapper?) fixes, anyway I can't reproduce
bug on this version,  that's good news, I think.

>
> Cheers,
> 
> Dave.

Thanks
Stanislaw Gruszka