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WARNING: at drivers/tty/tty_buffer.c:476 flush_to_ldisc()

DISCUSSION Jiri Slaby 2 participants 2 messages Nov 13, 2012 – Nov 14, 2012 1 message not in the archive

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A message that is not in the archive (sent off-list or not yet received): 20121113052026.GA26289@localhost

Jiri Slaby

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#1 lore raw
Quoted 1 line · Fengguang Wu

Hi Jiri,

Hi,

Quoted 22 lines

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
Quoted 3 lines

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,

Signature · 2 lines
js
suse labs
#2 lore raw

Hi Jiri,

Quoted 27 lines · Jiri Slaby
Quoted 1 line · Fengguang Wu

Hi Jiri,

Hi,

Quoted 22 lines

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
Quoted 6 lines
Quoted 3 lines

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...

I checked the bisect log (attached in the original email) and it shows that it may take several hundreds of boots to reproduce the error once. So in the bisect, it regards 7540 repeated good boots as one success.

Thanks,
Fengguang