linux-kernel - Re: [block:for-3.14/core] kernel BUG at fs/bio.c:1748

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Date:	Wed, 8 Jan 2014 20:51:38 +0000
From:	Chris Mason <clm@...com>
To:	"muthu.lkml@...il.com" <muthu.lkml@...il.com>
CC:	"kmo@...erainc.com" <kmo@...erainc.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"fengguang.wu@...el.com" <fengguang.wu@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lkp@...ux.intel.com" <lkp@...ux.intel.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [block:for-3.14/core] kernel BUG at fs/bio.c:1748

On Wed, 2014-01-08 at 12:40 -0800, Muthu Kumar wrote:
> On Wed, Jan 8, 2014 at 12:16 PM, Chris Mason <clm@...com> wrote:
> > On Wed, 2014-01-08 at 11:54 -0800, Muthu Kumar wrote:
> >> Chris,
> >>
> >> [    8.336061] WARNING: CPU: 0 PID: 0 at fs/bio.c:1778 bio_endio+0xbe/0x100()
> >> [    8.336062] bio_endio: bio for (unknown) without endio
> >>
> >> This is my recent change to avoid memory leak in bio_endio. But I
> >> think the problem is higher up, most likely bio_endio is called twice
> >> on the same bio (which was freed before).
> >>
> >
> > I think these are just two separate problems.  Lets ignore the WARN_ON
> > for now.
> >
> 
> Not really... the BUG that is triggered:
> 
> kernel BUG at fs/bio.c:523!
> 
> It is in bio_put() (added to bio_endio() as part of recent change)
> which gets an already freed bio.
> 

Oh! I see.  Let me try with that one reverted.  Thanks!

-chris

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