linux-kernel - Re: Meet the bugs for linux-3.19-rc4 on aarch64 board

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Message-ID: <20150204172229.GH28902@arm.com>
Date:	Wed, 4 Feb 2015 17:22:29 +0000
From:	Will Deacon <will.deacon@....com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Ding Tianhong <dingtianhong@...wei.com>,
	Arnd Bergmann <arnd@...db.de>, Linuxarm <linuxarm@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Meet the bugs for linux-3.19-rc4 on aarch64 board

On Wed, Feb 04, 2015 at 05:09:51PM +0000, Catalin Marinas wrote:
> On Wed, Feb 04, 2015 at 03:17:25PM +0000, Ding Tianhong wrote:
> > bad mode in Synchronous Abort handler detected, code 0x86000005
> > CPU: 1 PID: 381 Comm: kworker/1:1 Tainted: G           O   3.19.0-rc4+ #6
> > Hardware name: Hisilicon Board ESL (DT)
> > Workqueue: events           (null)
> > task: ffffffc01cdb5800 ti: ffffffc01db28000 task.ti: ffffffc01db28000
> > PC is at 0x0
> > LR is at process_one_work+0x144/0x33c
> 
> This looks like process_one_work() tried to execute address 0, possibly
> when it does:
> 
> 	worker->current_func(work);
> 
> > Internal error: Oops - bad mode: 0 [#1] SMP
> > Modules linked in: sre(O)
> > CPU: 1 PID: 381 Comm: kworker/1:1 Tainted: G           O   3.19.0-rc4+ #6
> > Hardware name: Hisilicon Board ESL (DT)
> > Workqueue: events           (null)
> 
> So there is an "events" workqueue with a NULL function which
> process_one_work() tries to call. You could add some more debugging in
> this function or you could start bisecting (could check 3.18 first).

Also, what's the sre module that you have loaded?

Will
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