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

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Message-ID: <CAFR8uec00zThzs5Q21ySG90shQHVxbRZDGrYBPrdn1KbNCQ_vw@mail.gmail.com>
Date:	Wed, 8 Jan 2014 12:40:54 -0800
From:	Muthu Kumar <muthu.lkml@...il.com>
To:	Chris Mason <clm@...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, 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.

>> Are you running the unmodified for-3.14/core or do you have local patches?
>>
>
> It's for-3.14/core with my btrfs branch.  Basically rc7 instead of rc6
> but no changes to the block layer.  I hadn't mounted btrfs yet.
>
> -chris
>
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