linux-kernel - Re: WARNING: at drivers/tty/tty_ldisc.c:766 tty_ldisc

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Message-ID: <CABqxG0c0wiaSXrLKCYc8Ef+uXEwkp=nuG+7-+pLoEEURkkDt=Q@mail.gmail.com>
Date:	Sun, 9 Oct 2011 14:59:49 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: at drivers/tty/tty_ldisc.c:766 tty_ldisc_reinit+0x52/0x90()
 [3.0]

On Fri, Sep 2, 2011 at 4:59 AM, Jiri Slaby <jslaby@...e.cz> wrote:
> On 08/28/2011 03:15 PM, Dave Jones wrote:
>>
>> Just saw this on a box that was recieving an rsync while I ssh'd in.
>> The ssh session hung.
>
> Yes, could you apply the attached debug patch and post a dmesg output?

I see this problem as well, the debug patch reports the refcount is 2

You can produce the WARN as below:
in xterm run:

exec 0<>/dev/console 1<>/dev/console 2<>/dev/console

>
>> WARNING: at drivers/tty/tty_ldisc.c:766 tty_ldisc_reinit+0x52/0x90()
>> Hardware name:
>> Modules linked in: nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc
>> p4_clockmod freq_table speedstep_lib nf_conntrack_ipv4 nf_defrag_ipv4
>> xt_state nf_conntrack microcode serio_raw snd_hda_codec_realtek i2c_i801
>> snd_hda_intel snd_hda_codec iTCO_wdt snd_hwdep iTCO_vendor_support snd_seq
>> snd_seq_device snd_pcm snd_timer snd r8169 soundcore mii snd_page_alloc
>> pata_sil680 i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last
>> unloaded: mperf]
>> Pid: 1381, comm: sshd Not tainted 2.6.40-4.fc15.x86_64.debug #1
>> Call Trace:
>>  [<ffffffff81058e74>] warn_slowpath_common+0x83/0x9b
>>  [<ffffffff81058ea6>] warn_slowpath_null+0x1a/0x1c
>>  [<ffffffff812f8e18>] tty_ldisc_reinit+0x52/0x90
>>  [<ffffffff812f9415>] tty_ldisc_hangup+0x13f/0x1e1
>>  [<ffffffff812f21b6>] __tty_hangup+0x111/0x35f
>>  [<ffffffff812f2429>] tty_vhangup+0xe/0x10
>>  [<ffffffff812faade>] pty_close+0x128/0x132
>>  [<ffffffff812f3404>] tty_release+0x1d8/0x4dc
>>  [<ffffffff81087a2e>] ? lock_release_holdtime.part.8+0x6b/0x72
>>  [<ffffffff8100eebf>] ? native_sched_clock+0x34/0x36
>>  [<ffffffff8113cdb2>] fput+0x127/0x1f5
>>  [<ffffffff81139d90>] filp_close+0x70/0x7b
>>  [<ffffffff81139e91>] sys_close+0xf6/0x13b
>>  [<ffffffff814fdf02>] system_call_fastpath+0x16/0x1b
>
>
>
> --
> js
> suse labs
>



-- 
Regards
Dave
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