linux-ext4 - Re: kernel BUG at fs/buffer.c:1234!

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Date:	Thu, 20 Jun 2013 09:20:01 -0700
From:	Dustin Lundquist <dustin@...l-ptr.net>
To:	Theodore Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: kernel BUG at fs/buffer.c:1234!

On 06/19/2013 11:55 AM, Theodore Ts'o wrote:
> On Wed, Jun 19, 2013 at 09:41:36AM -0700, Dustin Lundquist wrote:
>> I've run into the following oops several times with the 3.10-rc3
>> through -rc6, and they have not occurred under 3.9. Originally they
>> only occurred when running Google Chrome, but this is the first time
>> it has happened in another application.
>
> So this is very strange.  fs/buffer.c:1234 for 3.10-rc6 is this
> BUG_ON:
>
> static inline void check_irqs_on(void)
> {
> #ifdef irqs_disabled
> 	BUG_ON(irqs_disabled());
> #endif
> }
>
> The only place where ext4 turns off irq's is very briefly in
> fs/ext4/page-io.c, and it's pretty easy to visually inspect all of the
> calls to spin_lock_irqsave() and spin_lock_irqrestore() and
> lock_irq_save() and local_irq_restore() are properly bracketed --- and
> the stack trace does not have any of the functions that are defined in
> fs/ext4/page_io.c.
>
> I notice from the dmesg file that one of the ext4 file systems is
> mounted on a device mapper volume.  What kind of dm device is it?
This is an LVM volume on a single SSD. I've include fdisk, mount and lvm 
output at https://gist.github.com/dlundquist/1d94dd938f03c5d06a2b. 
Another clue might be that I'm using ecryptfs to encrypt my home directory.

Since the system is still half way responsive after this occurs, is 
there any other information I can gather after if occurs to aid in 
diagnosing this?

Thanks,


Dustin Lundquist

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