linux-kernel - Re: [bug] SLUB + mm/slab.c boot crash in -rc9

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Message-ID: <20080415204025.GA29784@elte.hu>
Date:	Tue, 15 Apr 2008 22:40:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <clameter@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai.Lu@....com,
	apw@...dowen.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> Ingo Molnar wrote:
>> my current guess would have been some bootmem regression/interaction that 
>> messes up the buddy bitmaps - but i just reverted to the v2.6.24 version 
>> of bootmem.c and that crashes too ...
>
> I know this is bit of hand-waving but have you noticed how all the 
> interesting sparsemem changes that one would expect to have caused the 
> breakage happened _before_ v2.6.24? So sorry for asking this again but 
> are we 110% sure the problem does not trigger with any of the 
> v2.6.24-rcN kernels?

quite. Here are all the successfull bootups from my (failed) bisection 
attempt:

 0773769191d943358a8392fa86abd756d004c4b6
 21af0297c7e56024a5ccc4d8ad2a590f9ec371ba
 26b8256e2bb930a8e4d4d10aa74950d8921376b8
 2a10e7c41254941cac87be1eccdcb6379ce097f5
 3aa88cdf6bcc9e510c0707581131b821a7d3b7cb
 49914084e797530d9baaf51df9eda77babc98fa8
 53a6e2342d73d509318836e320f70cd286acd69c
 5be3bda8987b12a87863c89b74b136fdb1f072db
 6d5f718a497375f853d90247f5f6963368e89803
 7272dcd31d56580dee7693c21e369fd167e137fe
 77de2c590ec72828156d85fa13a96db87301cc68
 82cfbb008572b1a953091ef78f767aa3ca213092
 b75f53dba8a4a61fda1ff7e0fb0fe3b0d80e0c64
 c087567d3ffb2c7c61e091982e6ca45478394f1a
 d4b37ff73540ab90bee57b882a10b21e2f97939f
 fde1b3fa947c2512e3715962ebb1d3a6a9b9bb7d

or, via git-describe:

v2.6.24-3908-g0773769
v2.6.24-2392-g21af029
v2.6.24-3868-g26b8256
v2.6.24-4463-g2a10e7c
v2.6.24-4457-g3aa88cd
v2.6.24
v2.6.24-3522-g53a6e23
v2.6.24-3131-g5be3bda
v2.6.24-4461-g6d5f718
v2.6.24-3891-g7272dcd
v2.6.24-3902-g77de2c5
v2.6.24-3613-g82cfbb0
v2.6.24-4449-gb75f53d
v2.6.24-3911-gc087567
v2.6.24-3913-gd4b37ff
v2.6.24-4464-gfde1b3f

i.e. vanilla v2.6.24 and a whole bunch of commits after it were booting 
just fine. (the problem might have been masked up to a certain point in 
theory, but given how resilient it is to offset changes in my testing i 
find that not very probable [but not impossible] )

	Ingo
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