From: Tejun Heo <tj@kernel.org>
To: Mike Galbraith <mgalbraith@suse.de>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [patch] workqueue: exit rescuer_thread() as TASK_RUNNING
Date: Wed, 28 Nov 2012 06:08:59 -0800 [thread overview]
Message-ID: <20121128140859.GD15971@htj.dyndns.org> (raw)
In-Reply-To: <1354083438.4506.3.camel@marge.simpson.net>
On Wed, Nov 28, 2012 at 07:17:18AM +0100, Mike Galbraith wrote:
>
> A rescue thread exiting TASK_INTERRUPTIBLE can lead to a task scheduling
> off, never to be seen again. In the case where this occurred, an exiting
> thread hit reiserfs homebrew conditional resched while holding a mutex,
> bringing the box to it's knees.
>
> PID: 18105 TASK: ffff8807fd412180 CPU: 5 COMMAND: "kdmflush"
> #0 [ffff8808157e7670] schedule at ffffffff8143f489
> #1 [ffff8808157e77b8] reiserfs_get_block at ffffffffa038ab2d [reiserfs]
> #2 [ffff8808157e79a8] __block_write_begin at ffffffff8117fb14
> #3 [ffff8808157e7a98] reiserfs_write_begin at ffffffffa0388695 [reiserfs]
> #4 [ffff8808157e7ad8] generic_perform_write at ffffffff810ee9e2
> #5 [ffff8808157e7b58] generic_file_buffered_write at ffffffff810eeb41
> #6 [ffff8808157e7ba8] __generic_file_aio_write at ffffffff810f1a3a
> #7 [ffff8808157e7c58] generic_file_aio_write at ffffffff810f1c88
> #8 [ffff8808157e7cc8] do_sync_write at ffffffff8114f850
> #9 [ffff8808157e7dd8] do_acct_process at ffffffff810a268f
> #10 [ffff8808157e7e78] acct_process at ffffffff810a27ba
> #11 [ffff8808157e7e98] do_exit at ffffffff8105e29a
> #12 [ffff8808157e7ee8] kthread at ffffffff8107afee
> #13 [ffff8808157e7f48] kernel_thread_helper at ffffffff8144a5c4
> [exception RIP: kernel_thread_helper]
> RIP: ffffffff8144a5c0 RSP: ffff8808157e7f58 RFLAGS: 00000202
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff8107af60 RDI: ffff8803ee491d18
> RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
>
> Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
> Cc: stable@vger.kernel.org
Applied to wq/for-3.8. Thanks!
--
tejun
prev parent reply other threads:[~2012-11-28 14:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-28 6:17 Mike Galbraith
2012-11-28 14:08 ` Tejun Heo [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121128140859.GD15971@htj.dyndns.org \
--to=tj@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mgalbraith@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®