| Date | Thu, 21 Feb 2013 08:16:32 -0500 | From | Sasha Levin <> | Subject | Re: [PATCH v4 00/32] ldisc patchset |
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On 02/20/2013 03:02 PM, Peter Hurley wrote: > Sasha and Dave, my trinity testbeds die in other areas right now; > I would really appreciate if you would please re-test this series.
Hi Peter,
I saw this twice in overnight fuzzing:
[ 1473.912280] ================================= [ 1473.913180] [ BUG: bad contention detected! ] [ 1473.914071] 3.8.0-next-20130220-sasha-00038-g1ad55df-dirty #8 Tainted: G W [ 1473.915684] --------------------------------- [ 1473.916549] kworker/1:1/361 is trying to contend lock (&tty->ldisc_sem) at: [ 1473.918031] [<ffffffff81c493df>] tty_ldisc_ref+0x1f/0x60 [ 1473.919060] but there are no locks held! [ 1473.919813] [ 1473.919813] other info that might help us debug this: [ 1473.920044] 2 locks held by kworker/1:1/361: [ 1473.920044] #0: (events){.+.+.+}, at: [<ffffffff811328a8>] process_one_work+0x228/0x6a0 [ 1473.920044] #1: ((&buf->work)){+.+...}, at: [<ffffffff811328a8>] process_one_work+0x228/0x6a0 [ 1473.920044] [ 1473.920044] stack backtrace: [ 1473.920044] Pid: 361, comm: kworker/1:1 Tainted: G W 3.8.0-next-20130220-sasha-00038-g1ad55df-dirty #8 [ 1473.920044] Call Trace: [ 1473.920044] [<ffffffff81c493df>] ? tty_ldisc_ref+0x1f/0x60 [ 1473.920044] [<ffffffff81182026>] print_lock_contention_bug+0xf6/0x110 [ 1473.920044] [<ffffffff81184973>] lock_contended+0x213/0x4e0 [ 1473.920044] [<ffffffff81c4bb41>] ldsem_down_read_trylock+0xb1/0xc0 [ 1473.920044] [<ffffffff81c493df>] tty_ldisc_ref+0x1f/0x60 [ 1473.920044] [<ffffffff81c4a687>] flush_to_ldisc+0x37/0x1a0 [ 1473.920044] [<ffffffff811329e6>] process_one_work+0x366/0x6a0 [ 1473.920044] [<ffffffff811328a8>] ? process_one_work+0x228/0x6a0 [ 1473.920044] [<ffffffff811332a8>] worker_thread+0x238/0x370 [ 1473.920044] [<ffffffff81133070>] ? rescuer_thread+0x310/0x310 [ 1473.920044] [<ffffffff8113d873>] kthread+0xe3/0xf0 [ 1473.920044] [<ffffffff8113d790>] ? flush_kthread_work+0x1f0/0x1f0 [ 1473.920044] [<ffffffff83dab4fc>] ret_from_fork+0x7c/0xb0 [ 1473.920044] [<ffffffff8113d790>] ? flush_kthread_work+0x1f0/0x1f0
Thanks, Sasha
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