Comment 8 for bug 620242

Sorry, my dmesg is different:

[ 2394.850285] Call Trace:
[ 2394.850293] [<ffffffff8159e18d>] schedule_timeout+0x22d/0x310
[ 2394.850299] [<ffffffff8104ee62>] ? enqueue_entity+0x132/0x1b0
[ 2394.850303] [<ffffffff81058884>] ? check_preempt_wakeup+0x1b4/0x290
[ 2394.850306] [<ffffffff8159d306>] wait_for_common+0xd6/0x180
[ 2394.850309] [<ffffffff81056d40>] ? default_wake_function+0x0/0x20
[ 2394.850312] [<ffffffff8159d48d>] wait_for_completion+0x1d/0x20
[ 2394.850317] [<ffffffff811763a9>] sync_inodes_sb+0x89/0xc0
[ 2394.850320] [<ffffffff8117ada0>] ? sync_one_sb+0x0/0x30
[ 2394.850323] [<ffffffff8117ad88>] __sync_filesystem+0x88/0xa0
[ 2394.850325] [<ffffffff8117adc0>] sync_one_sb+0x20/0x30
[ 2394.850329] [<ffffffff811559db>] iterate_supers+0x8b/0xd0
[ 2394.850332] [<ffffffff8117ae15>] sys_sync+0x45/0x70
[ 2394.850337] [<ffffffff8100a0f2>] system_call_fastpath+0x16/0x1b

The "fastpath" makes me think it relates to software RAID somehow.