linux-kernel - Re: 2.6.33.5 rt23: machine lockup (nfs/autofs related?)

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Date:	Mon, 12 Jul 2010 18:40:31 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: 2.6.33.5 rt23: machine lockup (nfs/autofs related?)

On Mon, 2010-07-12 at 18:10 -0700, Fernando Lopez-Lezcano wrote:
> On Mon, 2010-07-12 at 16:53 -0700, john stultz wrote:
> > 
> > Hrm. Ok.. I think the line 2100 above gives us a hint: (aparent == anon)
> > So if that were the case, we would have already locked aparent and that
> > would explain the blowup.
> > 
> > How does it do with the following change?
> 
> Ok, you are on to something. The machine did not crash hard!
> But the serial console printed this:

Sigh. Its never easy, is it? :)


> --------
> BUG: unable to handle kernel NULL pointer dereference at 0000008c
> IP: [<c045e50a>] rt_spin_lock_fastunlock.clone.2+0x6/0x3e
...
> Pid: 2855, comm: nautilus Not tainted
> 2.6.33.6-147.rt23.3.fc12.ccrma.i686.rt #3 P5K/EPU/P5K/EPU
> EIP: 0060:[<c045e50a>] EFLAGS: 00210246 CPU: 0
> EIP is at rt_spin_lock_fastunlock.clone.2+0x6/0x3e
> EAX: 00000078 EBX: ef45393c ECX: 00000000 EDX: 00000078
> ESI: ef716edc EDI: 00000000 EBP: f1977c8c ESP: f1977c88
>  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 preempt:00000000
> Process nautilus (pid: 2855, ti=f1976000 task=f2347130 task.ti=f1976000)
> Stack:
>  ef45393c f1977c94 c0781206 f1977cc8 c04d842e 00000000 ef703e54 faadd5bc
> <0> f1977cdc 126bc87a ef703ddc 00000000 ef45393c ef716edc ef6f5494
> faafdc6c
> <0> f1977df8 faad9041 c3604b5c faafdc6c ef452bfc 00007e7f f5eb41e8
> 00000007
> Call Trace:
>  [<c0781206>] ? rt_spin_unlock+0x8/0xa
>  [<c04d842e>] ? d_materialise_unique+0x210/0x2aa

Can you gdb list *0xc04d842e ?

Thanks again for all the testing here! Its really appreciated!
-john

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