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List:       linux-xfs
Subject:    Re: XFS hang in xlog_grant_log_space
From:       Nick Piggin <npiggin () kernel ! dk>
Date:       2010-07-30 3:59:55
Message-ID: 20100730035955.GA5271 () amd
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On Fri, Jul 30, 2010 at 08:56:58AM +1000, Dave Chinner wrote:
> On Fri, Jul 30, 2010 at 12:05:46AM +1000, Nick Piggin wrote:
> > On Wed, Jul 28, 2010 at 11:17:44PM +1000, Dave Chinner wrote:
> > > Something very strange is happening, and to make matters worse I
> > > cannot reproduce it with a debug kernel (ran for 3 hours without
> > > failing). Hence it smells like a race condition somewhere.
> > > 
> > > I've reproduced it without delayed logging, so it is not directly
> > > related to that functionality.
> > > 
> > > I've seen this warning:
> > > 
> > > Filesystem "ram0": inode 0x704680 background reclaim flush failed with 117
> > > 
> > > Which indicates we failed to mark an inode stale when freeing an
> > > inode cluster, but I think I've fixed that and the problem still
> > > shows up. It's posible the last version didn't fix it, but....
> > 
> > I've seen that one a couple of times too. Keeps coming back each
> > time you echo 3 > /proc/sys/vm/drop_caches :)
> 
> Yup - it's an unflushable inode that is pinning the tail of the log,
> hence causing the log space hangs.
> 
> > > Now I've got the ag iterator rotor patch in place as well and
> > > possibly a different version of the cluster free fix to what I
> > > previously tested and it's now been running for almost half an hour.
> > > I can't say yet whether I've fixed the bug of just changed the
> > > timing enough to avoid it. I'll leave this test running over night
> > > and redo individual patch testing tomorrow.
> > 
> > I reproduced it with fs_stress now too. Any patches I could test
> > for you just let me know.
> 
> You should see them in a few minutes ;)

It's certainly not locking up like it used to... Thanks!

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