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    SubjectRe: task imap:2958 blocked for more than 120 seconds
    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?

    -chris


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