linux-kernel - Re: [ANNOUNCE] 3.0-rt3

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Date:	Tue, 26 Jul 2011 11:01:40 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Darren Hart <dvhart@...ux.intel.com>
cc:	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.0-rt3

On Mon, 25 Jul 2011, Darren Hart wrote:
> 
> 
> On 07/24/2011 09:12 AM, Thomas Gleixner wrote:
> > On Sun, 24 Jul 2011, Maarten Lankhorst wrote:
> 
> ...
> 
> >> Also not sure where this one came from:
> >> [   37.456688] BUG: spinlock bad magic on CPU#3, threaded-ml/1619
> >> [   37.456690]  lock: ffff8801fdc74d50, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
> >> [   37.456692] Pid: 1619, comm: threaded-ml Tainted: G         C  3.0.0-rt3-patser+ #39
> >> [   37.456693] Call Trace:
> >> [   37.456697]  [<ffffffff81607a78>] spin_bug+0xa0/0xa8
> >> [   37.456699]  [<ffffffff8132b412>] do_raw_spin_lock+0xa2/0x170
> >> [   37.456702]  [<ffffffff8104a201>] ? get_parent_ip+0x11/0x50
> >> [   37.456704]  [<ffffffff8160d783>] _raw_spin_lock+0x23/0x30
> >> [   37.456706]  [<ffffffff810931ce>] rt_mutex_start_proxy_lock+0x2e/0xd0
> >> [   37.456708]  [<ffffffff8109093a>] futex_requeue+0x47a/0x850
> >> [   37.456710]  [<ffffffff8109138e>] do_futex+0xae/0xb00
> >> [   37.456712]  [<ffffffff81157dcd>] ? fget_light+0x6d/0x110
> >> [   37.456714]  [<ffffffff810b77b7>] ? audit_syscall_entry+0x2e7/0x310
> >> [   37.456715]  [<ffffffff814c9375>] ? sys_recvmsg+0x75/0x90
> >> [   37.456717]  [<ffffffff810923e6>] compat_sys_futex+0xf6/0x190
> >> [   37.456719]  [<ffffffff8100e864>] ? syscall_trace_enter+0x184/0x210
> >> [   37.456721]  [<ffffffff816158b3>] ia32_do_call+0x13/0x13
> > 
> > Urrgh, that's not a good one. Darren, can you please have a look at that?
> > 
> 
> Will do.
> 
> Maarten, what are you running when you hit this?
> rt_mutex_start_proxy_lock() is only called by the requeue_pi code and
> there is no libc support for that yet, so I'm surprised to see that in
> the stack trace (unless you're running my futextest suite).

threaded-ml, whatever that is. I suspect that the changes to the futex
code, which I ported forward from 33-rt have some wreckage in it.
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