linux-kernel - Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate

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Message-Id: <3D8A0565-36F9-4216-839E-4B4815E9AC78@kernel.crashing.org>
Date:	Mon, 19 Feb 2007 16:27:03 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate


On Feb 19, 2007, at 4:19 PM, OGAWA Hirofumi wrote:

> Kumar Gala <galak@...nel.crashing.org> writes:
>
>>>> I usually run the following twice to get the hang state:
>>>>
>>>> time ./trunc_test bar 100000000 &
>>>> time ./trunc_test baz 100000000 &
>>>>
>>>> I was wondering if anyone had any suggestions on what to poke at  
>>>> next
>>>> to try and figure out what is going on.
>>>
>>> Can you check /sys/block/xxx/stat or something to make sure there is
>>> no outstanding IO request?
>>>
>>> It seems to be no response from the lower layer...
>>
>> Once the system locks up I dont have any ability to do anything.
>
> Ah, doesn't sysrq also work? If sysrq work, it can use to see IO
> request state with a patch.

Yeah, got sysrq working today.  If you can point me at the patch I  
happy to apply it and get data.

- k

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