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To: linux-kernel@vger.kernel.org
From: scream <scream@wdk.dn.ua>
Subject: Re: [BUG] null-pointer in =?utf-8?b?dGFza19ycV9sb2Nr?= (2.6.35 to 3.0-rc7)
Date: Mon, 15 Aug 2011 07:22:29 +0000 (UTC)
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References: <4E25E2F5.7090807@dasr.de>
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Harald Laabs <kernelml <at> dasr.de> writes:

> 
> Hi,
> reloading an apache httpd can crash the kernel since 2.6.35.
> It seems that tasks are removed between creating the task-list and
> calling wake_up_sem_queue_do in freeary. The pointers to the
> task_struct elements end up in try_to_wake_up and sometimes contain
> 0x0 there.


Had the same in production.

Linux version 2.6.35-22-server (buildd@allspice) (gcc version 4.4.5 
(Ubuntu/Linaro 4.4.4-14ubuntu4) ) #33-Ubuntu SMP Sun Sep 19 20:48:58 UTC 2010 
(Ubuntu 2.6.35-22.33-server 2.6.35.4)

 Apache/2.2.16 (Ubuntu) PHP/5.3.3-1ubuntu9 with Suhosin-Patch mod_ssl/2.2.16 
OpenSSL/0.9.8o

Appeared 2 times after apache2 reload during cron daily jobs.