quota deadlock on 6.1-RC1

[Konstantin Belousov]

On Sun, May 07, 2006 at 07:59:33PM +0400, Dmitry Morozovsky wrote:
> On Sun, 7 May 2006, Konstantin Belousov wrote:
> 
> KB> > Alas, it is locked again:
> KB> > 
> KB> > root at office:~# ps axlww | grep snap
> KB> >     0    32     0   0  -4  0     0     8 snaplk DL    ??    0:04.55 [bufdaemon]
> KB> >     0    35     0   0  -4  0     0     8 snaplk DL    ??    0:01.11 [softdepflush]
> KB> >     0 45080 45061   0  -4  0  5980  2768 snaplk D     ??    0:00.09 /usr/local/sbin/smbd -D
> KB> >     0 46040 46039   0  -4  0  4492  3616 snaplk D+    p1    0:15.04 rsync -av /ar/winroot/distrib/ /st/winroot/tmp/distrib-temp/
> KB> >  1002 46116   726   0  -4  0  1612  1144 snaplk D+    p3    0:00.00 ls -GF -la /st/.snap/
> KB> > 
> KB> > Unfortunately, this was with non-debug kernel. I'm trying to reproduce the lock 
> KB> > with debug kernel right now, but still with no luck - sometimes machine is 
> KB> > almost hangs but up to now revives 4 or 5 times.
> KB> > 
> KB> So, you are running CURRENT ? Or did you manually backported changes
> KB> from CURRENT to 6-STABLE ? Note that none of the relevant commits
> KB> where MFCed still.
> 
> I'm running RELENG_6 with hand-merged sys/ufs/ffs changes from 1 to 7 May.
It would be great to show the patchset. Also note that relevant changes are
not limited to ufs/ffs. For instance, rev. 1.671 of kern/vfs_subr.c is
also important, as well as rev. 1.82 of ufs/ufs/ufs_quota.c, that
deals explicitely with combination of snapshots and quotas.
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