lkml.org 
[lkml]   [2011]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [BUG] null-pointer in task_rq_lock (2.6.35 to 3.0-rc7)
On 07/19/2011 11:14 PM, Eric Dumazet wrote:
> Le mardi 19 juillet 2011 à 22:03 +0200, Harald Laabs a écrit :Hi,
>>
>> I'm not able to fix or understand this bug myself, its already in
>> bugzilla with the call trace:
>> https://bugzilla.kernel.org/show_bug.cgi?id=27142
>>
>> Is there any more useful information I can provide? Anything to test?
Could you build a kernel with CONFIG_DEBUG_LIST enabled?
Does it report anything?
>> Does anyone know of changes from 2.6.34 to 2.6.35 that might have
>> broken this? (The diff and the changelog do not enlighten me, too
>> much changed and I understand little of it.)
> I feel commit 0a2b9d4c79671b059568 might be the bug origin
> (ipc/sem.c: move wake_up_process out of the spinlock section)
>
I'll try to reproduce the bug tomorrow.
Perhaps a race with multiple processes sleeping, some/all woken up by a
signal an a concurrent IPC_RM.

But I don't see the bug yet.

--
Manfred

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-07-20 20:11    [W:0.204 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site