linux-kernel - Re: Issues with "x86, um: switch to generic fork/vfork/clone" commit

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Date:	Sat, 10 Nov 2012 04:51:04 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: Issues with "x86, um: switch to generic fork/vfork/clone" commit

On Fri, Nov 09, 2012 at 08:36:53PM -0800, Michel Lespinasse wrote:
> Hi,
> 
> I'm having an issue booting current linux-next kernels on my test
> machines. Userspace crashes when it's supposed to pivot to the rootfs.
> With the loglevel=8 kernel parameter, the last messages I see are:
> 
> Checking root filesystem in pivot_root init.
> [    6.252717] usb 2-1: link qh256-0001/ffff880853ec9ab8 start 1 [1/0 us]
> [    6.259419] hub 2-1:1.0: state 7 ports 8 chg 0000 evt 0000
> [    6.292302] traps: hotplug[1633] general protection ip:f767c06b
> sp:ffbb2d1c error:0 in libc-2.3.6.so[f7652000+126000]
> 
> I ran a bisection and it turns out that
> e52d03a3775841cc68d0ea9d86f2f09b603c41e6 (x86, um: switch to generic
> fork/vfork/clone) is the commit breaking my setup. When reverting
> that, I am able to boot linux-next (or mmotm, which is what I was
> trying to do in the first place) without issues.
> 
> Sorry for not having a more complete root cause at the moment - I'm
> lacking some context as to what the change is trying to do.

Hmm...  32bit native, presumably?
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