linux-kernel - Re: Regression: ppc powerstation boot hang caused by slab initialisation code

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Message-Id: <1245709633.20062.13.camel@pasglop>
Date:	Tue, 23 Jun 2009 08:27:13 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Regression: ppc powerstation boot hang caused by slab
 initialisation code

On Mon, 2009-06-22 at 17:10 -0500, James Bottomley wrote:
> I'm getting a boot hang on my powerstation with recent kernels.  It
> hangs in the early prom init code:

It probably goes much further but doesn't get a chance to tell you :-)

I'll dig. Just in case, can you send me your .config ?

Cheers,
Ben.

> Please wait, loading kernel...
>    Elf64 kernel loaded...
> Loading ramdisk...
> ramdisk loaded at 02500000, size: 8280 Kbytes
> OF stdout device is: /ht/isa@...erial@2f8
> Preparing to boot Linux version 2.6.30 (jejb@...ymoor) (gcc version
> 4.3.3 (Debian 4.3.3-10) ) #1 SMP Mon Jun 22 09:59:35 CDT 2009
> command line: root=/dev/sda3 ro console=ttyS0,19200n1 
> memory layout at init:
>   alloc_bottom : 0000000002d16000
>   alloc_top    : 0000000030000000
>   alloc_top_hi : 0000000080000000
>   rmo_top      : 0000000030000000
>   ram_top      : 0000000080000000
> instantiating rtas at 0x000000002fff5000... done
> boot cpu hw idx 0000000000000000
> starting cpu hw idx 0000000000000001... done
> starting cpu hw idx 0000000000000002... done
> starting cpu hw idx 0000000000000003... done
> copying OF device tree...
> Building dt strings...
> Building dt structure...
> Device tree strings 0x0000000003117000 -> 0x0000000003117640
> Device tree struct  0x0000000003118000 -> 0x000000000311b000
> Calling quiesce...
> returning from prom_init
> 
> Git bisect identifies this commit:
> 
> commit 83b519e8b9572c319c8e0c615ee5dd7272856090
> Author: Pekka Enberg <penberg@...helsinki.fi>
> Date:   Wed Jun 10 19:40:04 2009 +0300
> 
>     slab: setup allocators earlier in the boot sequence
> 
> So it's something do do with early slab initialisation.  I'll try to
> track it down, but reverting it is hard because it seems to have a chain
> of dependent commits.
> 
> James
> 
> 
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