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

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Date:	Tue, 25 May 2010 16:34:44 +0200
From:	Piotr Hosowicz <piotr@...owicz.com>
To:	piotr@...owicz.com
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	Divyesh Shah <dpshah@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code:
 icedove-bin/5449

On 25.05.2010 16:13, Piotr Hosowicz wrote:
> On 25.05.2010 12:29, Piotr Hosowicz wrote:
>> On 25.05.2010 12:05, Piotr Hosowicz wrote:
>>> On 25.05.2010 12:00, Peter Zijlstra wrote:
>>>> On Tue, 2010-05-25 at 11:57 +0200, Piotr Hosowicz wrote:
>>>>> On 25.05.2010 11:43, Ingo Molnar wrote:
>>>>>
>>>>>> This doesnt fix the whole issue. cpu_clock() is local, while the
>>>>>> measurements
>>>>>> done in the blk code are global ...
>>>>>>
>>>>>> While the warning is fixed this way, the far more serious issue is
>>>>>> still
>>>>>> there: time can go backwards if two points of time measurement are on
>>>>>> different CPUs and can mess up the statistics with negative values,
>>>>>> etc...
>>>>>
>>>>> How serious is this? Can it damage my data? I ask because the
>>>>> machine is
>>>>> my private computer, not any test machine.
>>>>
>>>> I'm not sure, since I didn't really look what they use the timestamps
>>>> for, but a guess would say your data is safe, it might schedule the io
>>>> funny, but it should not compromise integrity. At best its used purely
>>>> for statistics and not even behaviour is affected.
>>>
>>> Thanks.
>>
>> Seems to work like a charm.
>
> Not exactly. I looked into the syslog. I's much better, but I rebooted
> to single user mode to rebuild nvidia driver (new beta version) and I
> see same error (BUG ... code: ???) on shuting down, mentioning sync,
> umount and finally shutdown.

Sorry, reversed order - shutdown, umount, finally sync.

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