linux-ext4 - Re: System hang with EXT4

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Message-id: <87fx7ixppv.fsf@openvz.org>
Date:	Fri, 11 Dec 2009 04:29:48 +0300
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Justin Maggard <jmaggard10@...il.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: System hang with EXT4

Justin Maggard <jmaggard10@...il.com> writes:

> On Wed, Dec 9, 2009 at 5:23 PM, Justin Maggard <jmaggard10@...il.com> wrote:
>> On Tue, Dec 8, 2009 at 7:18 AM, Jan Kara <jack@...e.cz> wrote:
>>>  Can you still switch consoles after the system hangs (it's good to
>>> debug this on a text console)? If yes, could you press Alt-Sysrq-w and
>>> take a picture of the console by digital camera or so (take pictures of
>>> as many screens as possible using console scrollback)? Thanks.
>>
>> Thanks for the response.  Console scrollback doesn't seem to work for
>> me in that mode.  I tried it three times.  Two of the times the list
>> was empty.  The other time, the screen just listed a bunch of rm
>> processes.
>
> I have a little more information to add.  After noticing the recent
> "Fix potential quota deadlock" patch on the mailing list, I figured it
> would be worth a shot to try it without quotas enabled.  This also
> avoids the system hang.  I tried applying that patch, but still had
> the same symptoms using that kernel.  So I'm seeing a consistent
> system hang with ext4 when delalloc and quotas are enabled on an SMP
> system.  With either quotas or delalloc disabled, it doesn't hang.
> Both enabled on a single processor system also doesn't hang.
You also may try another patch
"[PATCH] ext4: fix sleep inside spinlock issue aka #14739 V2"
>
> -Justin
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