linux-kernel - Re: [PATCH block/for-3.3/core] block: remove WARN_ON_ONCE() in exit_io

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Message-ID: <4EFA0604.1030607@fusionio.com>
Date:	Tue, 27 Dec 2011 18:53:08 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Sasha Levin <levinsasha928@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH block/for-3.3/core] block: remove WARN_ON_ONCE() in exit_io_context()

On 2011-12-27 18:35, Tejun Heo wrote:
> 6e736be7 "block: make ioc get/put interface more conventional and fix
> race on alloction" added WARN_ON_ONCE() in exit_io_context() which
> triggers if !PF_EXITING.  All tasks hitting exit_io_context() from
> task exit should have PF_EXITING set but task struct tearing down
> after fork failure calls into the function without PF_EXITING,
> triggering the condition.
> 
>   WARNING: at block/blk-ioc.c:234 exit_io_context+0x40/0x92()
>   Pid: 17090, comm: trinity Not tainted 3.2.0-rc6-next-20111222-sasha-dirty #77
>   Call Trace:
>    [<ffffffff810b69a3>] warn_slowpath_common+0x8f/0xb2
>    [<ffffffff810b6a77>] warn_slowpath_null+0x18/0x1a
>    [<ffffffff8181a7a2>] exit_io_context+0x40/0x92
>    [<ffffffff810b58c9>] copy_process+0x126f/0x1453
>    [<ffffffff810b5c1b>] do_fork+0x120/0x3e9
>    [<ffffffff8106242f>] sys_clone+0x26/0x28
>    [<ffffffff82425803>] stub_clone+0x13/0x20
>   ---[ end trace a2e4eb670b375238 ]---
> 
> Reported-by: Sasha Levin <levinsasha928@...il.com>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
> Heh, sorry about that.  Forgot about fork failure path.  Just removing
> the WARN_ON_ONCE() should be enough.  Thanks for reporting the problem.

Thanks, applied.

-- 
Jens Axboe

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