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Message-ID: <20100601064120.GA3407@elte.hu>
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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