linux-kernel - 2.6.33-rc8 breaks UML with Restrict initial stack space expansion to rlimit

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Date:	Sun, 14 Feb 2010 18:40:23 +0200
From:	Jouni Malinen <j@...fi>
To:	Michael Neuling <mikey@...ling.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: 2.6.33-rc8 breaks UML with Restrict initial stack space expansion
 to rlimit

It looks like the commit 803bf5ec259941936262d10ecc84511b76a20921
(fs/exec.c: restrict initial stack space expansion to rlimit) broke my
user mode Linux setup by somehow preventing system setup from running
properly (or killing some processes that try to mount things, etc.).
This commit turned up as the reason based on git bisect and reverting it
fixes my UML test setup (Ubuntu 9.10 on both host and in UML and AMD64
arch for both). I have no idea what exactly would be the main cause for
this issue, but this looks like a somewhat unfortunately timed
regression in 2.6.33-rc8.

The failed run shows like this (with current linux-2.6.git):

...
EXT3-fs (ubda): mounted filesystem with writeback data mode
VFS: Mounted root (ext3 filesystem) readonly on device 98:0.
IRQ 3/console-write: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 2/console: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs
mountall: mount /sys/kernel/debug [218] killed by KILL signal
mountall: Filesystem could not be mounted: /sys/kernel/debug
mountall: mount /dev [219] killed by KILL signal
mountall: Filesystem could not be mounted: /dev
mountall: mount /tmp [220] killed by KILL signal
mountall: Filesystem could not be mounted: /tmp
mountall: mount /var/lock [222] killed by KILL signal
mountall: Filesystem could not be mounted: /var/lock
...

With 803bf5ec reverted, UML comes up and the output looks like this:

...
EXT3-fs (ubda): mounted filesystem with writeback data mode
VFS: Mounted root (ext3 filesystem) readonly on device 98:0.
IRQ 3/console-write: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 2/console: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs
init: procps main process (226) terminated with status 255
fsck from util-linux-ng 2.16
...

-- 
Jouni Malinen                                            PGP id EFC895FA
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