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

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Message-ID: <47586554.5090409@redhat.com>
Date:	Thu, 06 Dec 2007 16:10:44 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Andi Kleen <ak@...e.de>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23: x86_64 oops caused by hotplug running before vdso initialized

On 12/06/2007 03:51 PM, Andi Kleen wrote:
> 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.

It was suggested that I just make the uevent_helper an empty string,
since that's what our (Fedora) initrd does anyway when it starts.
 
> Running any user space before __initcall() has finished is just wrong.

I thought that was a feature, so some early userspace code could help bring
up devices.
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