Re: [BUG] null-pointer in task_rq_lock (2.6.35 to 3.0-rc7)

From: scream
Date: Mon Aug 15 2011 - 05:45:23 EST

Harald Laabs <kernelml <at>> 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

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

Appeared 2 times after apache2 reload during cron daily jobs.

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