From: "Jakob Østergaard" <jakob@unthought.net>
To: David Rees <dbr@greenhydrant.com>, linux-kernel@vger.kernel.org
Subject: Re: bdflush and postgres stuck in D state
Date: Wed, 19 Sep 2001 11:26:49 +0200 [thread overview]
Message-ID: <20010919112649.B7537@unthought.net> (raw)
In-Reply-To: <20010918125605.F29908@unthought.net>, <20010918125605.F29908@unthought.net>; <20010918193023.P29908@unthought.net> <3BA78916.2984B011@zip.com.au> <20010918140820.A17263@greenhydrant.com>
In-Reply-To: <20010918140820.A17263@greenhydrant.com>; from dbr@greenhydrant.com on Tue, Sep 18, 2001 at 02:08:20PM -0700
On Tue, Sep 18, 2001 at 02:08:20PM -0700, David Rees wrote:
> On Tue, Sep 18, 2001 at 10:49:10AM -0700, Andrew Morton wrote:
> > Jakob Østergaard wrote:
> > >
> > > Sorry for following up on my own post, I have a little extra
> > > information.
> > >
> > > I started a g++ job to try to force the machine to write out some dirty
> > > buffers before I reboot. g++ now hangs along with two sync's, bdflush
> > > and the postgres process.
> > >
> >
> > Since 2.4.7 several bugs have been fixed in RAID1 which would
> > cause this, including a missing blockdevice unplug and failure
> > to hang onto the supposedly-reserved RAID1 buffer-heads.
>
> Even kernels as recent as 2.4.9 have this bug. See this thread for more
> info and a patch which fixes this bug.
>
> The thread:
> http://marc.theaimsgroup.com/?t=99911655500004&w=2&r=1
>
> The patch:
> http://marc.theaimsgroup.com/?l=linux-kernel&m=99913223508789&w=2
Thanks a lot !
Somehow I seem not have lost "most" linux-raid mails, dunno why... I hadn't
seen that thread before, but it was indeed the problem I saw here too.
I didn't lose any data on the 2.4.7 that did this, but it seems the situation
is more severe in 2.4.9, leading potentially to significant data loss.
/me prepares another boot (and a spare 32MB stick) for the raid-1 box
--
................................................................
: jakob@unthought.net : And I see the elder races, :
:.........................: putrid forms of man :
: Jakob Østergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
prev parent reply other threads:[~2001-09-19 9:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-18 10:56 bdflush and postgres stuck in D state Jakob Østergaard
2001-09-18 17:30 ` Jakob Østergaard
2001-09-18 17:49 ` Andrew Morton
2001-09-18 21:08 ` David Rees
2001-09-19 9:26 ` Jakob Østergaard [this message]
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