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Date:	Thu, 20 Jun 2013 09:20:01 -0700
From:	Dustin Lundquist <>
To:	Theodore Ts'o <>
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
> 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 
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?


Dustin Lundquist

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