Date: Sun, 7 May 2006 19:26:55 +0400 (MSD) From: Dmitry Morozovsky <marck@rinet.ru> To: Kris Kennaway <kris@obsecurity.org>, Tor Egge <tegge@freebsd.org> Cc: Chris <chrcoluk@gmail.com>, Mike Jakubik <mikej@rogers.com>, stable@freebsd.org, Robert Watson <rwatson@freebsd.org> Subject: Re: quota deadlock on 6.1-RC1 Message-ID: <20060507175330.H19670@woozle.rinet.ru> In-Reply-To: <20060507104355.K92932@woozle.rinet.ru> References: <20060504033300.GA39935@xor.obsecurity.org> <44598615.3040400@rogers.com> <20060504044758.GA41047@xor.obsecurity.org> <44599732.1050905@rogers.com> <20060505080543.GD5466@garage.freebsd.pl> <35c231bf0605051049t2761281ar97b9634b8279b1fd@mail.gmail.com> <445B991F.3050600@rogers.com> <6.2.3.4.0.20060505145259.10d8dca0@64.7.153.2> <3aaaa3a0605061238ib77bb38x6f61eb6cc1c1c6c1@mail.gmail.com> <20060506204720.S46997@fledge.watson.org> <20060506233525.GA52731@xor.obsecurity.org> <20060507104355.K92932@woozle.rinet.ru>
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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> 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@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. Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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