linux-kernel - Re: Process stuck in md_wakeup

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Date:	Mon, 13 Aug 2007 15:27:37 -0700
From:	"Russ Dill" <russ.dill@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, "Neil Brown" <neilb@...e.de>
Subject: Re: Process stuck in md_wakeup_thread

On 8/12/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Sat, 11 Aug 2007 02:34:34 +0000 (UTC) Russ Dill <Russ.Dill@...il.com> wrote:
>
> > On 2.6.22 from debian (stock), I have a process (dpkg) stuck with the following
> > calltrace:
> >
> > SysRq : Show Blocked State
> >
> >                          free                        sibling
> >   task             PC    stack   pid father child younger older
> > dpkg          D 00000003     0 26040  20765 (NOTLB)
> >        e57d5e30 00200082 00000000 00000003 dfc48ba8 00000000 dfc48ba8 00000000
> >        00000007 e0af45c0 e8ce17aa 0002827f 00051ec2 e0af46cc c1809980 00000000
> >        e8ce1324 0002827f 00200082 f881cd4c 00200286 f8ba2c85 c1809980 e57d5e60
> > Call Trace:
> >  [<f881cd4c>] md_wakeup_thread+0x26/0x28 [md_mod]
> >  [<f8ba2c85>] raid5_unplug_device+0x4e/0x5a [raid456]
>
> The above is stack gunk.
>
> >  [<c02a786e>] io_schedule+0x1d/0x27
> >  [<c014f3c5>] sync_page+0x0/0x3b
> >  [<c014f3fd>] sync_page+0x38/0x3b
> >  [<c02a7a6f>] __wait_on_bit_lock+0x2a/0x52
> >  [<c014f3b7>] __lock_page+0x58/0x5e
> >  [<c01333aa>] wake_bit_function+0x0/0x3c
> >  [<c0155daa>] truncate_inode_pages_range+0x201/0x256
> >  [<c0155e16>] truncate_inode_pages+0x17/0x1a
> >  [<f8c867eb>] reiserfs_delete_inode+0x36/0xdd [reiserfs]
> >  [<f8c867b5>] reiserfs_delete_inode+0x0/0xdd [reiserfs]
> >  [<c017acc5>] generic_delete_inode+0xa0/0x105
> >  [<c017a4ad>] iput+0x60/0x62
> >  [<c0172f41>] do_unlinkat+0xb6/0x126
> >  [<c0103d7e>] syscall_call+0x7/0xb
> >  =======================
> >
> > My system is still up and running.
> >
>
> It's stuck waiting for a page to come unlocked.  The most likely
> explanation is that an IO got lost.
>

I'm not sure how an IO becomes lost. I'm not running on exotic
hardware or anything. What can I do to provide more useful debugging
output in case this occurs again?
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