Subject: Re: Lock-up on PPC64
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: malc@pulsesoft.com
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <871vvy77v4.fsf@linmac.oyster.ru>
References: <Pine.LNX.4.64.0812212058550.2164@linmac.oyster.ru>
	 <20081222233223.GA6688@joi> <877i5rh9rm.fsf@linmac.oyster.ru>
	 <20081223234513.GA8730@deepthought>   <871vvy77v4.fsf@linmac.oyster.ru>
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Date: Thu, 25 Dec 2008 11:32:43 +1100
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On Wed, 2008-12-24 at 03:08 +0300, malc@pulsesoft.com wrote:
> Ken Moffat <zarniwhoop@ntlworld.com> writes:
> 
> > On Tue, Dec 23, 2008 at 06:04:45AM +0300, malc@pulsesoft.com wrote:
> >> 
> >> I don't know where to get PPC64 capable memtest, even if it exists the
> >> probability of two different machines exhibiting almost the same
> >> behaviour is rather slim. Netconsole doesn't catch anything. In fact
> >> i just had slightly different situation where after ssh connection was
> >> killed i was able to reconnect and look at dmesg there - nothing.
> >> 
> >  If you wanted to, you could get memtester from
> > http://pyropus.ca/software/memtester/ - not as convenient as
> > memtest86 etc (it's just a userspace task, so it can't test all the
> > memory), but it did work on ppc64 last time I tried it (nearly 2
> > years ago).
> >
> 
> Thanks for the reference, but i'm sure, now more than ever, that bad
> memory has nothing to do with it, all signs are there that kernel is
> confused by the way signals are (mis)used by Mono.

It shouldn't be but I agree with you, it smells bad. Can you report that
again on the linuxppc-dev@ozlabs.org mailing list ? Along with
instructions to d/l, install & run the minimum repro-case ? I'll try to
give it a go on different ppc64 machines as soon as I'm over my upcoming
xmas hangover :-) If it appears to be ps3 specific, we can work with
Geoff Levand (PS3 maintainer for Sony) to try to identify the root cause
and fix it.

Cheers,
Ben.


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