From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.
Date: Wed, 27 Apr 2011 11:50:00 -0500 [thread overview]
Message-ID: <1303923000.2583.8.camel@mulgrave.site> (raw)
In-Reply-To: <1303921583-sup-4021@think>
On Wed, 2011-04-27 at 12:33 -0400, Chris Mason wrote:
> Probably easier to debug with a sysrq-l and sysrq-w.
Yes, just enabling them for the repro ... I didn't echo 1
> /proc/sys/kernel/sysrq first time around
> If you get stuck
> on the filesystem, it is probably waiting on ram, which it probably
> can't get because kswapd is spinning. Eventually everyone backs up
> waiting for the transaction that never ends. If we're really lucky it
> is just GFP_KERNEL where it should NOFS.
>
> Since you're often stuck in different spots inside shrink_slab, we're
> probably not stuck on a lock. But, trying with lock debugging, lockdep
> enabled and preempt on is a good idea to rule out locking mistakes.
>
> Does the fedora debug kernel enable preempt?
No ... I've taken the Fedora 15 kernel config directly from their
install CD for this (with a bit of munging to get it to work on -rc4)
James
WARNING: multiple messages have this Message-ID (diff)
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.
Date: Wed, 27 Apr 2011 11:50:00 -0500 [thread overview]
Message-ID: <1303923000.2583.8.camel@mulgrave.site> (raw)
In-Reply-To: <1303921583-sup-4021@think>
On Wed, 2011-04-27 at 12:33 -0400, Chris Mason wrote:
> Probably easier to debug with a sysrq-l and sysrq-w.
Yes, just enabling them for the repro ... I didn't echo 1
> /proc/sys/kernel/sysrq first time around
> If you get stuck
> on the filesystem, it is probably waiting on ram, which it probably
> can't get because kswapd is spinning. Eventually everyone backs up
> waiting for the transaction that never ends. If we're really lucky it
> is just GFP_KERNEL where it should NOFS.
>
> Since you're often stuck in different spots inside shrink_slab, we're
> probably not stuck on a lock. But, trying with lock debugging, lockdep
> enabled and preempt on is a good idea to rule out locking mistakes.
>
> Does the fedora debug kernel enable preempt?
No ... I've taken the Fedora 15 kernel config directly from their
install CD for this (with a bit of munging to get it to work on -rc4)
James
--
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WARNING: multiple messages have this Message-ID (diff)
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.
Date: Wed, 27 Apr 2011 11:50:00 -0500 [thread overview]
Message-ID: <1303923000.2583.8.camel@mulgrave.site> (raw)
In-Reply-To: <1303921583-sup-4021@think>
On Wed, 2011-04-27 at 12:33 -0400, Chris Mason wrote:
> Probably easier to debug with a sysrq-l and sysrq-w.
Yes, just enabling them for the repro ... I didn't echo 1
> /proc/sys/kernel/sysrq first time around
> If you get stuck
> on the filesystem, it is probably waiting on ram, which it probably
> can't get because kswapd is spinning. Eventually everyone backs up
> waiting for the transaction that never ends. If we're really lucky it
> is just GFP_KERNEL where it should NOFS.
>
> Since you're often stuck in different spots inside shrink_slab, we're
> probably not stuck on a lock. But, trying with lock debugging, lockdep
> enabled and preempt on is a good idea to rule out locking mistakes.
>
> Does the fedora debug kernel enable preempt?
No ... I've taken the Fedora 15 kernel config directly from their
install CD for this (with a bit of munging to get it to work on -rc4)
James
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-04-27 16:50 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-27 16:09 [BUG] fatal hang untarring 90GB file, possibly writeback related James Bottomley
2011-04-27 16:09 ` James Bottomley
2011-04-27 16:33 ` Chris Mason
2011-04-27 16:33 ` Chris Mason
2011-04-27 16:50 ` James Bottomley [this message]
2011-04-27 16:50 ` James Bottomley
2011-04-27 16:50 ` James Bottomley
2011-04-27 16:54 ` Chris Mason
2011-04-27 16:54 ` Chris Mason
2011-04-27 17:21 ` James Bottomley
2011-04-27 17:21 ` James Bottomley
2011-04-27 17:21 ` James Bottomley
2011-04-27 17:34 ` Chris Mason
2011-04-27 17:34 ` Chris Mason
2011-04-27 17:50 ` James Bottomley
2011-04-27 17:50 ` James Bottomley
2011-04-27 18:25 ` Colin Ian King
2011-04-27 18:25 ` Colin Ian King
2011-04-28 15:57 ` James Bottomley
2011-04-28 15:57 ` James Bottomley
2011-04-27 20:05 ` James Bottomley
2011-04-27 20:05 ` James Bottomley
2011-04-28 11:36 ` Colin Ian King
2011-04-28 11:36 ` Colin Ian King
2011-04-28 12:29 ` Chris Mason
2011-04-28 12:29 ` Chris Mason
2011-04-28 13:42 ` Colin Ian King
2011-04-28 13:42 ` Colin Ian King
2011-04-28 13:45 ` Chris Mason
2011-04-28 13:45 ` Chris Mason
2011-04-28 14:01 ` Colin Ian King
2011-04-28 14:04 ` Chris Mason
2011-04-28 14:04 ` Chris Mason
2011-04-28 15:23 ` Colin Ian King
2011-04-28 14:25 ` Jan Kara
2011-04-28 14:25 ` Jan Kara
2011-04-28 14:33 ` Jan Kara
2011-04-28 14:33 ` Jan Kara
2011-04-28 14:58 ` Colin Ian King
2011-04-28 22:40 ` Jan Kara
2011-04-28 22:40 ` Jan Kara
2011-04-28 22:44 ` James Bottomley
2011-04-28 22:44 ` James Bottomley
2011-05-03 18:55 ` Colin Ian King
2011-05-03 18:55 ` Colin Ian King
2011-04-28 16:11 ` James Bottomley
2011-04-28 16:11 ` James Bottomley
2011-04-28 14:49 ` James Bottomley
2011-04-28 14:49 ` James Bottomley
2011-04-28 13:52 ` Jan Kara
2011-04-28 13:52 ` Jan Kara
2011-04-28 14:07 ` Mel Gorman
2011-04-28 14:07 ` Mel Gorman
2011-04-28 14:25 ` James Bottomley
2011-04-28 14:25 ` James Bottomley
2011-04-28 15:08 ` Mel Gorman
2011-04-28 15:08 ` Mel Gorman
2011-04-28 16:01 ` James Bottomley
2011-04-28 16:01 ` James Bottomley
2011-04-28 16:50 ` James Bottomley
2011-04-28 16:50 ` James Bottomley
2011-04-28 16:56 ` James Bottomley
2011-04-28 16:56 ` James Bottomley
2011-04-28 17:18 ` Mel Gorman
2011-04-28 17:18 ` Mel Gorman
2011-04-28 18:30 ` James Bottomley
2011-04-28 18:30 ` James Bottomley
2011-04-28 19:21 ` Mel Gorman
2011-04-28 19:21 ` Mel Gorman
2011-04-28 19:59 ` James Bottomley
2011-04-28 19:59 ` James Bottomley
2011-04-28 20:27 ` Mel Gorman
2011-04-28 20:27 ` Mel Gorman
2011-04-29 15:02 ` James Bottomley
2011-04-29 15:02 ` James Bottomley
2011-04-28 21:12 ` James Bottomley
2011-04-28 21:12 ` James Bottomley
2011-04-28 22:43 ` James Bottomley
2011-04-28 22:43 ` James Bottomley
2011-05-03 9:13 ` Mel Gorman
2011-05-03 9:13 ` Mel Gorman
2011-05-03 14:13 ` James Bottomley
2011-05-03 14:13 ` James Bottomley
2011-05-03 14:22 ` James Bottomley
2011-05-06 7:42 ` Mel Gorman
2011-05-06 7:42 ` Mel Gorman
2011-05-06 8:07 ` Mel Gorman
2011-05-09 18:16 ` James Bottomley
2011-05-09 18:16 ` James Bottomley
2011-05-10 10:21 ` Mel Gorman
2011-05-10 10:21 ` Mel Gorman
2011-05-10 10:33 ` Pekka Enberg
2011-05-10 10:33 ` Pekka Enberg
2011-05-10 14:01 ` James Bottomley
2011-05-10 14:01 ` James Bottomley
2011-05-10 14:35 ` Mel Gorman
2011-05-10 14:35 ` Mel Gorman
2011-05-10 15:29 ` James Bottomley
2011-05-10 15:29 ` James Bottomley
2011-05-10 15:57 ` James Bottomley
2011-05-10 15:57 ` James Bottomley
2011-05-10 17:05 ` James Bottomley
2011-05-10 17:05 ` James Bottomley
2011-05-10 17:17 ` Mel Gorman
2011-05-10 17:17 ` Mel Gorman
2011-05-10 17:29 ` James Bottomley
2011-05-10 17:29 ` James Bottomley
2011-05-10 21:08 ` Raghavendra D Prabhu
2011-05-11 9:16 ` Mel Gorman
2011-05-11 9:16 ` Mel Gorman
2011-05-06 11:42 ` Mel Gorman
2011-05-06 11:42 ` Mel Gorman
2011-05-06 15:44 ` Mel Gorman
2011-05-06 15:44 ` Mel Gorman
2011-05-06 19:14 ` James Bottomley
2011-05-06 19:14 ` James Bottomley
2011-05-06 19:37 ` Mel Gorman
2011-05-06 19:37 ` Mel Gorman
2011-05-10 5:37 ` Colin Ian King
2011-05-10 5:37 ` Colin Ian King
2011-05-10 5:37 ` Colin Ian King
2011-05-06 15:58 ` James Bottomley
2011-05-03 9:54 ` Colin Ian King
2011-05-03 9:54 ` Colin Ian King
2011-04-28 17:10 ` Colin Ian King
2011-04-28 17:10 ` Colin Ian King
2011-04-28 0:37 ` Dave Chinner
2011-04-28 0:37 ` Dave Chinner
2011-04-29 10:23 ` Sedat Dilek
2011-04-29 10:23 ` Sedat Dilek
2011-04-29 15:37 ` James Bottomley
2011-04-29 15:37 ` James Bottomley
2011-04-29 16:31 ` James Bottomley
2011-04-29 16:31 ` James Bottomley
2011-04-29 18:02 ` James Bottomley
2011-04-29 18:02 ` James Bottomley
2011-05-02 20:04 ` James Bottomley
2011-05-02 20:04 ` James Bottomley
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