linux-kernel - Re: Lock-up on PPC64

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Date:	Mon, 5 Jan 2009 19:34:36 +0300 (MSK)
From:	malc <av1474@...tv.ru>
To:	Michael Ellerman <michael@...erman.id.au>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: Lock-up on PPC64

On Mon, 5 Jan 2009, Michael Ellerman wrote:

> On Sun, 2008-12-28 at 03:45 +0300, malc wrote:
>> On Thu, 25 Dec 2008, Benjamin Herrenschmidt wrote:
>>
>>> On Wed, 2008-12-24 at 03:08 +0300, malc@...sesoft.com wrote:
>>>> Ken Moffat <zarniwhoop@...world.com> writes:
>>>>
>>>>> On Tue, Dec 23, 2008 at 06:04:45AM +0300, malc@...sesoft.com wrote:
>>
>> [..snip..]
>>
[..snip..]

>>
>> Now to the Christmas cheer, i've tried v2.6.28 and couldn't help but
>> notice that the problem is gone, bisecting v2.6.27 (which funnily i
>> had to mark good) to v2.6.28 (which has to be marked bad) wasn't fun
>> but eventually converged at ab598b6680f1e74c267d1547ee352f3e1e530f89
>>
>> commit ab598b6680f1e74c267d1547ee352f3e1e530f89
>> Author: Paul Mackerras <paulus@...ba.org>
>> Date:   Sun Nov 30 11:49:45 2008 +0000
>>
>>      powerpc: Fix system calls on Cell entered with XER.SO=1
>>
>> Now the lock-up is gone, however the code never exercises the path
>> taken during the lock-up so i guess it, at least, deserves a better
>> look by PPC64 care takers.
>
> I'm confused. Which code never exercises which path, and so what
> deserves a better look?

Before this change (atleast) mono_handle_native_sigsegv was executed
(before machine locks-up hard) after the change this code path is
never touched.

The fact that machine locks up hard and not even magic sysrq works
is what deserves a better look.

[..snip..]

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