Re: evdev soft lockup 2.6.24-rc5-mm1

From: Jiri Slaby
Date: Wed Jan 09 2008 - 05:30:26 EST


On 01/09/2008 11:11 AM, Jiri Kosina wrote:
On Wed, 9 Jan 2008, Jiri Slaby wrote:

BUG: soft lockup - CPU#1 stuck for 11s! [X:2887]
[ ... ]
Call Trace:
[<ffffffff804e7648>] __mutex_lock_slowpath+0x38/0xd0
[<ffffffff804e747e>] mutex_lock+0x1e/0x30
[<ffffffff8040c497>] input_release_device+0x27/0x50
[<ffffffff804102aa>] evdev_ungrab+0x3a/0x50
[<ffffffff804103eb>] evdev_release+0xcb/0xd0
[<ffffffff80293460>] __fput+0xc0/0x230
[<ffffffff802938a6>] fput+0x16/0x20
[<ffffffff80290296>] filp_close+0x56/0x90
[<ffffffff80291afa>] sys_close+0x9a/0xf0
[<ffffffff8020ba4e>] system_call+0x7e/0x83
I was not able to use sysrq keys, the keyboard is obviously defunct. If this is not known, I'll try to turn lockdep on and maybe connect through ssh next time it happens.

Is this reproducible on your side?

not 100%, it happens occasionally.

Running with lockdep would be really helpful, so that we possibly know who is holding the other instance of dev->mutex.

I'll try my best.
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