Re: task imap:2958 blocked for more than 120 seconds

[Adrian von Bidder]

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

-- 
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colleagues decided that 2000 pages describing our software solution is
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        -- Michal ÄihaÅ

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