linux-kernel - Re: workqueue panic in 3.4 kernel

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Message-ID: <CALZhoSQNeaErA5TrovPRTtAwGqsoFwMYRx=rCwSTzUoytw533A@mail.gmail.com>
Date:	Tue, 12 Mar 2013 14:01:16 +0800
From:	Lei Wen <adrian.wenl@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	leiwen@...vell.com, wwang27@...vell.com
Subject: Re: workqueue panic in 3.4 kernel

On Tue, Mar 12, 2013 at 1:40 PM, Tejun Heo <tj@...nel.org> wrote:
> On Tue, Mar 12, 2013 at 01:34:56PM +0800, Lei Wen wrote:
>> > Memory areas aren't always zero on allocation.
>>
>> Shouldn't work structure be allocated with kzalloc?
>
> It's not required to. work_struct can also be on stack. It's "init"
> after all. Also, if you require clearing the memory before initing,
> you would be just shifting problem from INIT to memory clearing.
>

I see...
How about only check those workqueue structure not on stack?
For current onstack usage is rare, and should be easier to check with.

Thanks,
Lei
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