linux-kernel - Re: WARNING: at drivers/tty/tty_buffer.c:476 flush_to

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Date:	Tue, 13 Nov 2012 20:55:34 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: at drivers/tty/tty_buffer.c:476 flush_to_ldisc()

On 11/13/2012 06:20 AM, Fengguang Wu wrote:
> Hi Jiri,

Hi,

> I got the following warning
> 
> cat: /proc/1/maps: No such file or directory
> [   72.249806] ------------[ cut here ]------------
> [   72.250807] WARNING: at /c/kernel-tests/src/tip/drivers/tty/tty_buffer.c:476 flush_to_ldisc+0x5a/0x1ad()
> [   72.252674] tty is NULL
> [   72.253182] Pid: 15, comm: kworker/0:1 Not tainted 3.7.0-rc4-05821-gdb38463 #166
> [   72.253672] Call Trace:
> [   72.253672]  [<ffffffff8103ccee>] warn_slowpath_common+0x62/0x79
> [   72.256297]  [<ffffffff8103cd73>] warn_slowpath_fmt+0x46/0x48
> [   72.257292]  [<ffffffff811e66c3>] flush_to_ldisc+0x5a/0x1ad
> [   72.258478]  [<ffffffff81053a6d>] process_one_work+0x246/0x44f
> [   72.259640]  [<ffffffff810539da>] ? process_one_work+0x1b3/0x44f
> [   72.260817]  [<ffffffff811e6669>] ? tty_buffer_free+0x61/0x61
> [   72.261820]  [<ffffffff81053fd2>] worker_thread+0x1ed/0x2c8
> [   72.262883]  [<ffffffff81053de5>] ? rescuer_thread+0x140/0x140
> [   72.263878]  [<ffffffff81058556>] kthread+0xd4/0xdc
> [   72.264980]  [<ffffffff810625d7>] ? finish_task_switch.constprop.79+0x7a/0xbf
> [   72.266150]  [<ffffffff81058482>] ? __kthread_parkme+0x61/0x61
> [   72.267145]  [<ffffffff81533bea>] ret_from_fork+0x7a/0xb0
> [   72.268361]  [<ffffffff81058482>] ? __kthread_parkme+0x61/0x61
> 
> and it's bisected to
> 
> commit ecbbfd44a08fa80e0d664814efd4c187721b85f6

Yes, I know about this already. Can you reproducible that easily given
you bisected that? I would love to be able to reproduce that...

thanks,
-- 
js
suse labs
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