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

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Date:	Fri, 09 Jul 2010 16:13:44 -0700
From:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To:	john stultz <johnstul@...ibm.com>
Cc:	nando@...ma.Stanford.EDU, 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 Fri, 2010-07-09 at 15:57 -0700, john stultz wrote:
> On Fri, 2010-07-09 at 15:13 -0700, Fernando Lopez-Lezcano wrote:
> > On Fri, 2010-07-09 at 12:54 -0700, john stultz wrote:
> > > On Fri, 2010-07-09 at 12:02 -0700, Fernando Lopez-Lezcano wrote:
> > > > Ok, I got one! (had to go buy a null modem cable, I thought I had one
> > > > but it has disappeared since the last time I did this :-)
> > > 
> > > Great! Sorry to make you go shopping! But this points out the problem
> > > nicely.
> > 
> > No problem at all, I was sure I had one... anyway, I still need it :-<
> > 
> > > > Find it below... it keeps spewing stuff every once in a while. Hopefully
> > > > this will be enough. No response from the network or the keyboard or
> > > > mouse at this point, reset is the only way out. 
> > > > 
> > > > I can retest if somebody comes up with a patch...
> > 
> > Sorry, it looks like the patch patched correctly and this is the new
> > kernel, but I still get a hang as before. 
> 
> So looking over it, I'm not easily seeing what else could be off.
> 
> So Lets see if we can cut some of the guess work out of this...
> 
> >  [<c04e08e9>] ? d_materialise_unique+0xbf/0x29e
> 
> I'm curious exactly where that is in d_materialise_unique. To find out,
> can you find the vmlinux image in the base of the directory you built
> the kernel you triggered this in?
> 
> Then run:
> # gdb ./vmlinux
> 
> Once gdb loads:
> (gdb) list *0xc04e08e9
> 
> That should point to exactly where in the function we are trying to
> acquire a previously locked lock.

I'll have to rebuild. I'm doing full rpm package builds or a build
server and the original build tree is gone. 

-- Fernando


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