linux-kernel - Re: 2.6.23: x86_64 oops caused by hotplug running before vdso initialized

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Date:	Thu, 6 Dec 2007 21:51:55 +0100
From:	Andi Kleen <ak@...e.de>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23: x86_64 oops caused by hotplug running before vdso initialized

On Thursday 06 December 2007 20:44:46 Chuck Ebbert wrote:
> pages is NULL here, implying vma->vm_private_data was NULL. This is apparently
> because init_vdso_vars() is __initcall and runs after the rootfs gets populated.
> An experimental initrd containing an /sbin/hotplug binary caused this. Normally
> we don't have that file in the initrd. Should vdso init be done earlier to prevent
> this problem?

We've often had bugs like this. Sure it could be fixed here, but then
the next bug would crop up again later I bet.

It would be better to move the first user  space code execution later I think. 
I guess the hotplug events could be delayed or initrd just mounted later.

Running any user space before __initcall() has finished is just wrong.

-Andi
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