linux-kernel - Re: BUG: using smp_processor_id() in preemptible [00000000] code: icedove-bin/5449

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Date:	Tue, 1 Jun 2010 08:41:20 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>,
	Jens Axboe <jens.axboe@...cle.com>
Cc:	piotr@...owicz.com, linux-kernel@...r.kernel.org,
	Divyesh Shah <dpshah@...gle.com>
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code:
 icedove-bin/5449


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Mon, 2010-05-24 at 05:03 +0200, Piotr Hosowicz wrote:
> > [  720.313607] BUG: using smp_processor_id() in preemptible [00000000] code: icedove-bin/5449
> > [  720.313612] caller is native_sched_clock+0x3c/0x68
> > [  720.313616] Pid: 5449, comm: icedove-bin Tainted: P            2.6.34-20100524-0407 #1
> > [  720.313618] Call Trace:
> > [  720.313624]  [<ffffffff811a533b>] debug_smp_processor_id+0xc7/0xe0
> > [  720.313629]  [<ffffffff81009b87>] native_sched_clock+0x3c/0x68
> > [  720.313634]  [<ffffffff81009a4d>] sched_clock+0x9/0xd
> > [  720.313637]  [<ffffffff811823ec>] blk_rq_init+0x92/0x9d
> > [  720.313641]  [<ffffffff81184227>] get_request+0x1bf/0x2c7
> > [  720.313646]  [<ffffffff8118435c>] get_request_wait+0x2d/0x19d 
> 
> This comes from wreckage in the blk tree..
> 
> ---
> commit 9195291e5f05e01d67f9a09c756b8aca8f009089
> Author: Divyesh Shah <dpshah@...gle.com>
> Date:   Thu Apr 1 15:01:41 2010 -0700
> 
>     blkio: Increment the blkio cgroup stats for real now

Jens, this regression is still in .35-rc1 and triggers in about 25% of all 
-tip boot tests.

The above commit is using sched_clock() in an unsafe way - please fix it or 
revert it.

The local_clock() changes PeterZ is working on are still WIP, it's not sure 
we'll have it before .36.

Thanks,

	Ingo
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