Re: sparc64, mm BUG in 3.9-rc8

[David Miller]

From: David Miller <davem@xxxxxxxxxxxxx>
Date: Tue, 23 Apr 2013 16:17:51 -0400 (EDT)

> From: Meelis Roos <mroos@xxxxxxxx>
> Date: Tue, 23 Apr 2013 00:19:49 +0300 (EEST)
> 
>>> > Hello, I got a non-booting Sun E420R (sparc64) with 3.9-rc8: BUG-s in 
>>> > mm/slub.c:925 and mm/memory.c:1267 (the latter keeps scrolling until 
>>> > other things break and panic comes from trying to kill init). This is 
>>> > reproducible. Same machine runs 3.9.0-rc7-00004-gbb33db7 successfully.
>>> > Configuration is below.
>>> 
>>> It's certainly a bug in the TLB shootdown fix, please verify that
>>> reverting the following fixes things:
>>> 
>>> >From f36391d2790d04993f48da6a45810033a2cdf847 Mon Sep 17 00:00:00 2001
>>> From: "David S. Miller" <davem@xxxxxxxxxxxxx>
>>> Date: Fri, 19 Apr 2013 17:26:26 -0400
>>> Subject: [PATCH] sparc64: Fix race in TLB batch processing.
>> 
>> Yes, reverting that makes it work again.
> 
> Just an update, using your config I was able to make one that boots on my
> machine and reproduces the problem.

Ok, I've narrowed it down to CONFIG_DEBUG_ATOMIC_SLEEP, as the exact config
option which starts the crashes happening when it is enabled.

I should have this fixed by the end of today.
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