linux-ext4 - Re: ext4 stops responding, need help debugging (kernel oops 5 in utf8s_to

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Message-ID: <20140205121301.GA25674@infradead.org>
Date:	Wed, 5 Feb 2014 04:13:01 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Lenz Weber <mail@...zw.de>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4 stops responding, need help debugging (kernel oops 5 in
 utf8s_to_utf16s)

On Wed, Feb 05, 2014 at 12:44:26PM +0100, Lenz Weber wrote:
> Hello everyone,
> I have a NAS with an ext4 filesystem that I access using NFSv4. From
> time to time (about once in a month), the the ext4 driver crashes and I
> can't access the file system in any way until I reboot.
> 
> As I have no further experience in filesystems, maybe you can help me.
> The system is currently in "blocked" state, so I can do any experiments
> you ask me to if you need more data.
> 
> For starters, I am attaching a dmesg output, maybe this already gives
> you an idea on what might be wrong.

This is one of the Qnap trees which has horrible hacks all over the VFS
and filesystems for per-process case insensitive support and some backup
functionality using directory hardlinks.  I doubt it's supportable by
anyone including Qnap themselves.

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