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

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Message-ID: <1389215536.23310.37.camel@ret.masoncoding.com>
Date:	Wed, 8 Jan 2014 21:11:49 +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 13:01 -0800, Muthu Kumar wrote:
> On Wed, Jan 8, 2014 at 12:51 PM, Chris Mason <clm@...com> wrote:
> > 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
> >
> 
> But, like I said, problem is in different place. I am running a "dd"
> on ext4 fs for a while now, but didn't hit the problem. Any idea to
> repro locally? I would also suggest running just the for-3.1/core to
> isolate the issue.

Just reverting that change fixes it for me.  Jens mentioned it was
broken for on-stack bios.

-chris

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