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Date:	Wed, 17 Sep 2014 17:13:22 +0800
From:	Jovi Zhangwei <jovi.zhangwei@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: sched: spinlock recursion in sched_rr_get_interval

On Tue, Jul 8, 2014 at 4:05 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, Jul 07, 2014 at 09:55:43AM -0400, Sasha Levin wrote:
>> I've also had this one, which looks similar:
>>
>> [10375.005884] BUG: spinlock recursion on CPU#0, modprobe/10965
>> [10375.006573]  lock: 0xffff8803a0fd7740, .magic: dead4ead, .owner: modprobe/10965, .owner_cpu: 15
>> [10375.007412] CPU: 0 PID: 10965 Comm: modprobe Tainted: G        W      3.16.0-rc3-next-20140704-sasha-00023-g26c0906-dirty #765
>
> Something's fucked; so we have:
>
> debug_spin_lock_before()
>         SPIN_BUG_ON(lock->owner == current, "recursion");
>
> Causing that, _HOWEVER_ look at .owner_cpu and the reporting cpu!! How
> can the lock owner, own the lock on cpu 15 and again contend with it on
> CPU 0. That's impossible.
>
> About when-ish did you start seeing things like this? Lemme go stare
> hard at recent changes.

Peter, any new update on this issue?

Recently we also found a similar deadlock in our box, but with
3.4-stable kernel.

<0>[177064.149832] BUG: spinlock recursion on CPU#11, current: IVS_RcvReq1/16444
<0>[177064.149840]  lock: <NULL>/0xffff88017afd5640, .magic: dead4ead,
.owner: IVS_RcvReq1/16444, .owner_cpu: 14

Thanks.

Jovi
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