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

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Date:	Mon, 15 Feb 2010 00:23:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jouni Malinen <j@...fi>
Cc:	Michael Neuling <mikey@...ling.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.33-rc8 breaks UML with Restrict initial stack space expansion to rlimit

On Sunday 14 February 2010, Jouni Malinen wrote:
> 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
> ...

I have created the Bugzilla entry at http://bugzilla.kernel.org/show_bug.cgi?id=15308
for your report.

Thanks,
Rafael
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