linux-ext4 - Re: Crash after umount'ing a disconnected disk and JBD: recovery failed (Re: extfs reliability)

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Message-ID: <4C604CE0.9040808@vlnb.net>
Date:	Mon, 09 Aug 2010 22:45:52 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Ted Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Crash after umount'ing a disconnected disk and JBD: recovery
 failed (Re: extfs reliability)

Ted Ts'o, on 08/06/2010 10:10 PM wrote:
> On Fri, Aug 06, 2010 at 05:23:46PM +0400, Vladislav Bolkhovitin wrote:
>>>>
>>>> 1. A bunch of detected hung tasks with call traces.
>>>>
>>>
>>> Do you eventually get file
>>> system I/O errors that abort the journal transaction?  You should...
>>
>> Yes, as you can see in the previously attached log.
>
> OK, so what are you complaining about?  This is *normal*.  You can
> change how long the kernel will wait before printing the warnings, by
> adjusting /proc/sys/kernel/hung_task_timeout_secs, but the fact that
> you're getting the detected hung tasks is the system performing as
> designed.

Well, I'm not complaining, I'm reporting.

I can't say where is the problem. And I really would *not* say that 
activation of the hung tasks detector is normal. A correct timeout 
should be set by default, not after manual user intervention.

>>>> 2. "JBD: recovery failed" I reported before.
>>>
>>> I've searched my mail archives, and I'm not sure what you're talking
>>> about here.  Maybe this was in an e-mail that you sent that perhaps
>>> got lost?
>>
>> It's next to the message on which you originally replied. It was
>> about ext3, but this time I saw it with ext4.
>
> Can you resend, and with a new and specific subject line that is
> helpful for finding it, and just that one message?

See http://lkml.org/lkml/2010/7/29/222 and 
http://lkml.org/lkml/2010/7/29/325.

Vlad
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