linux-kernel - Re: task imap:2958 blocked for more than 120 seconds

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Message-Id: <201001140803.48506@fortytwo.ch>
Date:	Thu, 14 Jan 2010 08:03:43 +0100
From:	Adrian von Bidder <avbidder@...tytwo.ch>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: task imap:2958 blocked for more than 120 seconds

Heyho!

On Thursday 14 January 2010 02.08:29 Chris Mason wrote:
> On Mon, Jan 11, 2010 at 09:45:31AM +0100, Adrian von Bidder wrote:
> > On Monday 11 January 2010 08.34:36 Adrian von Bidder wrote:
> > > "btrfs-vol -b" on an 2T btrfs fs (raid 1 mode over 4 disks) on an arm
> > >  CPU  has triggered it several times, so it seems a reliable way to
> > >  reproduce this.
> >
> > Found it (Debian kernel 2.6.32 on ARM):
> >
> > [78260.386272] INFO: task btrfs-vol:10979 blocked for more than 120
> > seconds. [78260.386306] "echo 0 >
> > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [78260.386331] btrfs-vol     D c02b080c     0 10979      1 0x00000001
> > [78260.386373] [<c02b080c>] (schedule+0x424/0x488) from [<c02b0c9c>]
> > (schedule_timeout+0x1c/0x244) [78260.386408] [<c02b0c9c>]
> > (schedule_timeout+0x1c/0x244) from [<c02b0b10>]
> > (wait_for_common+0xdc/0x178) [78260.386611] [<c02b0b10>]
> > (wait_for_common+0xdc/0x178) from [<bf29b880>]
> > (merge_reloc_roots+0x15c/0x1a4 [btrfs]) [78260.386940] [<bf29b880>]
> > (merge_reloc_roots+0x15c/0x1a4 [btrfs]) from [<bf2a3fd8>]
> > (relocate_block_group+0x548/0x5c8 [btrfs])
> 
> Blocking here isn't a huge surprise, relocation can involve some long
> held locks.  Does this recover?

Yes, always so far.

cheers
-- vbi

-- 
Tomorrow we have important delivery and this afternoon out Japanese
colleagues decided that 2000 pages describing our software solution is
not enough. They need at least 500 extra pages. Fortunately it could be
any existing documentation, so we randomly choose POSIX standard Part 1
(535 pages) and the Eclipse basic tutorial (592 pages).
        -- Michal Čihař

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