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SubjectRe: tty ldisc lockups in linux-next
On 09/25/2012 10:49 AM, Sasha Levin wrote:
> Hi all,
>
> While fuzzing with trinity in a KVM tools guest running linux-next kernel, I keep hitting the following lockup:

Hi, I'm confused here. Is this different to what you reported a couple
days ago? Doesn't reverting aa3c8af86382 help in the end?

> [ 842.780242] INFO: task init:1 blocked for more than 120 seconds.
> [ 842.780732] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 842.781559] init D ffff88000d5b0000 3344 1 0 0x00000002
> [ 842.783226] ffff88000d5adc28 0000000000000082 ffff88000d5adbe8 ffffffff81150ac5
> [ 842.784714] ffff88000d5adfd8 ffff88000d5adfd8 ffff88000d5adfd8 ffff88000d5adfd8
> [ 842.785737] ffffffff84e2e420 ffff88000d5b0000 ffff88000d5b08f0 7fffffffffffffff
> [ 842.786764] Call Trace:
> [ 842.787102] [<ffffffff81150ac5>] ? sched_clock_local+0x25/0xa0
> [ 842.787858] [<ffffffff83a0be45>] schedule+0x55/0x60
> [ 842.788511] [<ffffffff83a09dd5>] schedule_timeout+0x45/0x360
> [ 842.789251] [<ffffffff83a0d54d>] ? _raw_spin_unlock_irqrestore+0x5d/0xb0
> [ 842.790149] [<ffffffff8117b13d>] ? trace_hardirqs_on+0xd/0x10
> [ 842.790594] [<ffffffff83a0d574>] ? _raw_spin_unlock_irqrestore+0x84/0xb0
> [ 842.791096] [<ffffffff81137af7>] ? prepare_to_wait+0x77/0x90
> [ 842.791535] [<ffffffff81b9b2c6>] tty_ldisc_wait_idle.isra.7+0x76/0xb0
> [ 842.792016] [<ffffffff81137cd0>] ? abort_exclusive_wait+0xb0/0xb0
> [ 842.792490] [<ffffffff81b9c03b>] tty_ldisc_hangup+0x1cb/0x320
> [ 842.792924] [<ffffffff81b933a2>] ? __tty_hangup+0x122/0x430
> [ 842.793364] [<ffffffff81b933aa>] __tty_hangup+0x12a/0x430
> [ 842.794077] [<ffffffff83a0d574>] ? _raw_spin_unlock_irqrestore+0x84/0xb0
> [ 842.794942] [<ffffffff81b955cc>] disassociate_ctty+0x6c/0x230
> [ 842.795693] [<ffffffff8110e7e8>] do_exit+0x3d8/0xa90
> [ 842.796361] [<ffffffff83a0e4d9>] ? retint_swapgs+0x13/0x1b
> [ 842.797079] [<ffffffff8110ef64>] do_group_exit+0x84/0xd0
> [ 842.797818] [<ffffffff8110efc2>] sys_exit_group+0x12/0x20
> [ 842.798524] [<ffffffff83a0edcd>] system_call_fastpath+0x1a/0x1f
> [ 842.799294] 1 lock held by init/1:
> [ 842.799734] #0: (&tty->ldisc_mutex){+.+.+.}, at: [<ffffffff81b9bf92>] tty_ldisc_hangup+0x122/0x320



--
js
suse labs


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