linux-kernel - Re: [PATCH wq/for-4.0-fixes v2] workqueue: fix hang involving racing cancel[_delayed]_work_sync()'s for PREEMPT

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Date:	Thu, 5 Mar 2015 04:36:38 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Tomeu Vizoso <tomeu.vizoso@...il.com>
Cc:	Jesper Nilsson <jesper.nilsson@...s.com>,
	Rabin Vincent <rabinv@...s.com>,
	Jesper Nilsson <jespern@...s.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH wq/for-4.0-fixes v2] workqueue: fix hang involving racing
 cancel[_delayed]_work_sync()'s for PREEMPT_NONE

On Thu, Mar 05, 2015 at 10:24:50AM +0100, Tomeu Vizoso wrote:
...
> [  317.251001] PC is at bit_waitqueue+0x38/0x6c
...
> [  317.420658] [<c028fe18>] (bit_waitqueue) from [<c0270d34>]
> (__cancel_work_timer+0x28/0x1b0)
> [  317.430598] [<c0270d34>] (__cancel_work_timer) from [<c0270ed8>]
> (cancel_work_sync+0x1c/0x20)
> [  317.440672] [<c0270ed8>] (cancel_work_sync) from [<bf0ed138>]
> (regulatory_exit+0x24/0x17c [cfg80211])
> [  317.451396] [<bf0ed138>] (regulatory_exit [cfg80211]) from
> [<bf125184>] (cfg80211_exit+0x38/0x4c [cfg80211])
> [  317.462726] [<bf125184>] (cfg80211_exit [cfg80211]) from
> [<c02c8b4c>] (SyS_delete_module+0x1b4/0x1f8)
> [  317.473411] [<c02c8b4c>] (SyS_delete_module) from [<c0210a00>]
> (ret_fast_syscall+0x0/0x34)

Ah, I think that's from feeding static address to virt_to_page.  :(
Reverted the patch from the branch.  Will think more about what to do.

Thanks.

-- 
tejun
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