linux-kernel - Re: Many open/close on same files yeilds "No such file or directory".

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Date:	Fri, 02 May 2008 17:55:10 +0200
From:	Jesper Krogh <jesper@...gh.cc>
To:	Ray Lee <ray-lk@...rabbit.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Many open/close on same files yeilds "No such file or directory".

Ray Lee wrote:
> On Fri, May 2, 2008 at 8:19 AM, Jesper Krogh <jesper@...gh.cc> wrote:
>> Jesper Krogh wrote:
>>
>>>> I'd suspect that after 1e8 loops your CPU got too hot and started to
>>>> misbehave.
>>>>
>>> Hardware is an Sun Fire X4600 (8xdual-core AMD64 processors). The
>>> problem seem to be tied to this filesystem. (I cannot havent been able
>>> to reproduce it on the /-mounted disk of the same system. So if a cpu
>>> problem.. then it shouldn't be tied to a specific filesystem?
>>>
>>> This is the only activity on the system .. so a load of 1 / 16cpus.
>>>
>>  I've tried to explore this suggestion (the best I could).
>>
>>  There are 2 ext3 filesystems locally mounted. / and this one. Running 16
>> parallel runs of this program on a file on the /-mounted filesystem cannot
>> reproduce the problem. If it was linked to hot hardware, I believe I should
>> be able to reproduce it this way. The servers are in a 17 degress
>> serverroom.
>>
>>  It changes alot when.. it actually happens. The "earliest ones" has been
>> from 200000 cycles.
> 
> Run 16 in parallel on /, and another 16 simultaneously on the trouble
> filesystem? If you continue to get errors only on the 'trouble'
> filesystem, and no errors start occurring on / coincident, then it
> sounds pretty localized.

That test has been done. I can only reproduce it on this filesystem. But 
I cannot really conclude that it is only present there.. since sometimes 
my testprogram just goes on .. and dies past 1 billion cycles. But I 
have never gotten errors from the / filesystem on the same installation.

> BTW, I may have missed this earlier, but does it happen *anywhere* on
> the troublesome filesystem (ie, in a newly created subdirectory)?

I'll run that test now.

-- 
Jesper
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