linux-ext4 - Re: OOPs in ext4

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Message-ID: <CAOkSjBiAtP0pc5nckV_Opd1+kxaxFBxT=4tYgUGMo+gkAz5_EQ@mail.gmail.com>
Date:	Wed, 21 May 2014 16:33:57 +0200
From:	Arturo Borrero Gonzalez <arturo.borrero.glez@...il.com>
To:	Lukáš Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: OOPs in ext4

On 21 May 2014 15:20, Lukáš Czerner <lczerner@...hat.com> wrote:
> On Wed, 21 May 2014, Arturo Borrero Gonzalez wrote:
>
>> Date: Wed, 21 May 2014 12:29:04 +0200
>> From: Arturo Borrero Gonzalez <arturo.borrero.glez@...il.com>
>> To: linux-ext4@...r.kernel.org
>> Subject: OOPs in ext4
>>
>> Hi there!
>>
>> I have an oops in a virtual machine using ext4 as fs.
>
> Hi,
>
> yes there is definitely a bug in the error handling code because we
> really should not hit that BUG_ON() later.
>
> However I am curious how we got this state in the first place. Can
> you provide the logs before the first oops ? Are there any more
> warnings ?
>

Unfortunately, given the fs was remounted ro, no logs were written.
I took the error from dmesg.

> What is your storage setup ? Any particular workload you've been
> running at the time ? Can you reproduce it ?
>

I have a machine with a plain libvirt/kvm with LVM for virtualization.
I create a couple of LVM volumes for each virtual machine.

Each virtual machine is then installed to the LVM volume, using ext4
and using the volume as a plain disc (no nested LVM, etc..)
Specifically, I use this virtual machine to develop (netfilter,
kernel). Is a Debian Wheezy system.

So, what happened was:
 * ssh to the virtual machine.
 * cd to the devel dir
 * stg pop a couple of patches.
 * git pull the latest nftables kernel tree.
 * run `make -j8 deb-pkg'
 * the build failed due to fs remounted RO.
 * reboot.

The kernel image I was running is this:
http://git.kernel.org/cgit/linux/kernel/git/pablo/nftables.git/ I see
now that it seem to be based upon 3.10, not 3.14 as originally I
stated.

regards
-- 
Arturo Borrero González
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