linux-kernel - Re: clocksource mutex deadlock, cat current

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Date:	Sat, 6 Feb 2010 15:46:50 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andreas Mohr <andi@...as.de>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	John Stultz <johnstul@...ibm.com>
Subject: Re: clocksource mutex deadlock, cat current_clocksource
 (2.6.33-rc6)

On Sat, 6 Feb 2010, Andreas Mohr wrote:
> echo t > /proc/sysrq-trigger shows (full output on request):

At least the state of "kwatchdog" would be interesting.

> cat           D 00000000     0 19361   2959 0x00000000
>  de215ef8 00000046 00000000 00000000 c13b0294 dd45c380 dd45c5fc df9c6ef0
>  de215f28 de215f08 c13b0260 00000202 de215f28 c124fcae dd45c380 c13b0280
>  c13b0280 c13b0280 dd45c380 de215f08 ffffffff d9de1000 c13b0338 df9c6ef0
> Call Trace:
>  [<c124fcae>] mutex_lock_nested+0x157/0x23d
>  [<c104873e>] sysfs_show_current_clocksources+0x17/0x41
> 
> INFO: lockdep is turned off.

Why is lockdep turned off ?

Thanks,

	tglx
 
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