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[bug] SLOB crash, 2.6.24-rc2

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From: Ingo Molnar <mingo@...>
To: Rafael J. Wysocki <rjw@...>, Matt Mackall <mpm@...>
Cc: LKML <linux-kernel@...>, Andrew Morton <akpm@...>, Linus Torvalds <torvalds@...>
Subject: [bug] SLOB crash, 2.6.24-rc2
Date: Wednesday, November 14, 2007 - 7:20 am

there's a new SLOB regression - the attached config crashes with:

[   61.245190] rc.sysinit used greatest stack depth: 1680 bytes left
[   61.386859] list_add corruption. prev->next should be next (407d973c), but was 418cf818. (prev=41877098).
[   61.396328] ------------[ cut here ]------------
[   61.400910] kernel BUG at lib/list_debug.c:33!
[   61.405330] invalid opcode: 0000 [#1] DEBUG_PAGEALLOC

looks like memory corruption of some sort and it's reproducible. Picking 
CONFIG_SLUB makes the crash go away. Booting v2.6.23 with the same 
.config works fine.

bisection is difficult due to networking releated Kconfig problems: if i 
put my .24 .config into .23 then the network drivers get lost. (we 
should be more Kconfig-compatible between kernel releases, to ease 
bisection efforts)

(full bootlog and config attached)

	Ingo
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Messages in current thread:
2.6.24-rc2: Reported regressions from 2.6.23 (updated), Rafael J. Wysocki, (Sun Nov 11, 3:58 pm)
[bug] SLOB crash, 2.6.24-rc2, Ingo Molnar, (Wed Nov 14, 7:20 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Matt Mackall, (Wed Nov 14, 1:36 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, Matt Mackall, (Wed Nov 14, 2:39 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, Ingo Molnar, (Wed Nov 14, 3:05 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, David Miller, (Wed Nov 14, 6:39 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, Matt Mackall, (Wed Nov 14, 6:53 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, David Miller, (Wed Nov 14, 7:10 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, Matt Mackall, (Wed Nov 14, 7:37 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, David Miller, (Wed Nov 14, 7:41 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, Ingo Molnar, (Thu Nov 15, 6:43 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Nick Piggin, (Thu Nov 15, 6:57 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Ingo Molnar, (Thu Nov 15, 7:28 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Dave Haywood, (Thu Nov 15, 8:18 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Nick Piggin, (Thu Nov 15, 7:39 am)
[patch] slob: fix memory corruption, Ingo Molnar, (Thu Nov 15, 7:32 am)
Re: [patch] slob: fix memory corruption, Matt Mackall, (Thu Nov 15, 12:00 pm)
Re: [patch] slob: fix memory corruption, Ingo Molnar, (Thu Nov 15, 8:48 am)
Re: [patch] slob: fix memory corruption, Nick Piggin, (Thu Nov 15, 4:25 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, David Miller, (Thu Nov 15, 6:51 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Ingo Molnar, (Thu Nov 15, 7:03 am)
Re: [bug] SLOB crash, 2.6.24-rc2, David Miller, (Thu Nov 15, 7:05 am)
Re: [bug] SLOB crash, 2.6.24-rc2, Matt Mackall, (Wed Nov 14, 8:09 pm)
Re: [bug] SLOB crash, 2.6.24-rc2, Matt Mackall, (Wed Nov 14, 3:42 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Francois Romieu, (Sun Nov 11, 4:33 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Ingo Molnar, (Sun Nov 11, 4:30 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Alan Cox, (Sun Nov 11, 4:09 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Bartlomiej Zolnierkiewicz..., (Sun Nov 11, 6:22 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Alan Cox, (Sun Nov 11, 6:46 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Andrew Morton, (Mon Nov 12, 9:11 pm)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Thomas Lindroth, (Tue Nov 13, 10:09 am)
Re: 2.6.24-rc2: Reported regressions from 2.6.23 (updated), Rafael J. Wysocki, (Sun Nov 11, 4:34 pm)