On Tue, Jul 07, 2015 at 05:29:43PM +0800, Gavin Guo wrote: > Hi all, > > Recently, we observed that there is the error message in > Ubuntu-3.13.0-48.80: > > "XFS: possible memory allocation deadlock in kmem_alloc (mode:0x8250)" > > repeatedly shows in the dmesg. Temporarily, our workaround is to tune the > parameters, such as, vfs_cache_pressure, min_free_kbytes, and dirty_ratio. > > And we also found that there are different error messages regarding the > hung tasks which happened in xfs_log_commit_cil and xlog_cil_push. > > The log is available at: http://paste.ubuntu.com/11835007/ > > The following link seems the same problem we suffered: > > XFS hangs with XFS: possible memory allocation deadlock in kmem_alloc > http://oss.sgi.com/archives/xfs/2015-03/msg00172.html > > I read the mail and found that there might be some modification regarding > to move the memory allocation outside the ctx lock. And I also read the > latest patch from February of 2015 to see if there is any new change > about that. Unfortunately, I didn't find anything regarding the change (may > be I'm not familiar with the XFS, so didn't find the commit). If it's > possible for someone who is familiar with the code to point out the commits > related to the bug if already exist or any status about the plan. No commits - the approach I thought we might be able to take to avoid the problem didn't work out. I have another idea of how we might solve the problem, but I haven't ad a chance to prototype it yet. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
