quota deadlock on 6.1-RC1
kostikbel at gmail.com
Sun May 7 15:40:38 UTC 2006
On Sun, May 07, 2006 at 07:26:55PM +0400, Dmitry Morozovsky wrote:
> On Sun, 7 May 2006, Dmitry Morozovsky wrote:
> DM> KK> > Also, as an FYI, several quota-related snapshot fixes went into CVS in the
> DM> KK> > last 24-48 hours. Once they've settled for a few weeks, and assuming they
> DM> KK> > don't have complex dependencies, they will get merged to RELENG_6.
> DM> KK> > Presumably if there is sufficient demand, and they adequately address the
> DM> KK> > reports of deadlocks with quotas+snapshots, they could be merged to
> DM> KK> > RELENG_6_1 as an errata update.
> DM> KK>
> DM> KK> The fixes seem to indeed correct all the deadlocks I was seeing. I
> DM> KK> don't have time to produce a 6.x patch now though, but it should be a
> DM> KK> simple matter for someone else to do.
> DM> FWIW, for me it is much stabler too, at least in normal load patterns. I'll
> DM> spend a bit of time to stress-test this on our Samba quota-enabled server
> DM> during our long weekend (today-to-Tuesday) to catch possible rare races.
> Alas, it is locked again:
> root at office:~# ps axlww | grep snap
> 0 32 0 0 -4 0 0 8 snaplk DL ?? 0:04.55 [bufdaemon]
> 0 35 0 0 -4 0 0 8 snaplk DL ?? 0:01.11 [softdepflush]
> 0 45080 45061 0 -4 0 5980 2768 snaplk D ?? 0:00.09 /usr/local/sbin/smbd -D
> 0 46040 46039 0 -4 0 4492 3616 snaplk D+ p1 0:15.04 rsync -av /ar/winroot/distrib/ /st/winroot/tmp/distrib-temp/
> 1002 46116 726 0 -4 0 1612 1144 snaplk D+ p3 0:00.00 ls -GF -la /st/.snap/
> Unfortunately, this was with non-debug kernel. I'm trying to reproduce the lock
> with debug kernel right now, but still with no luck - sometimes machine is
> almost hangs but up to now revives 4 or 5 times.
So, you are running CURRENT ? Or did you manually backported changes
from CURRENT to 6-STABLE ? Note that none of the relevant commits
where MFCed still.
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