linux-ext4 - Re: Help required for Debugging JBD

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Date:	Wed, 22 Jun 2011 09:43:52 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	Niraj Kulkarni <kulkarniniraj14@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Help required for Debugging JBD

On Tue, Jun 21, 2011 at 7:52 PM, Niraj Kulkarni
<kulkarniniraj14@...il.com> wrote:
> Hi all,
>        I have modified my JBD (no change to Ext3) to support
> Transactional-Flash. For that I require only to collect metadata and data
> blocks and send them simultaneously (no transaction record, revoke record
> etc).

It's hard to help without knowing what your patches do in more details.
Could you post the patches or give a more detailed description of how they
work?
For example, how do you collect data blocks without them being already
written? or is this not a requirement for your use case?

>       The problem is, though it works well for small number of operations,
> the kernel completely hangs when I run any benchmark (like blogbench or
> postmark) over them. The bad thing is that there is no trace left
> afterwards, ie logs don't contain any message since the operation was
> started, kernel OOPS are not shown, no faults are shown, no panic is shown
> even though I have enabled panic on hard/soft lockup. I have to hard reboot
> machine each time.

Did you try alt+sysrq+w to dump waiting tasks?

>        So essentially, I am totally clueless about the point  at which it is
> crashing or reason behind it. There is a small possibility that bug may be
> in modified MTD layer (which I've written myself), but since I have run
> unmodified Ext3 on that MTD layer without any bug, the chance of buggy MTD
> layer appears very slim.
>
> Any help in greatly appreciated.
>
> Niraj
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