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

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Message-ID: <CANN689GetguA+1bqKXC=Cq0SLcLqaqLsn5XGBZYVbWeBogX+zA@mail.gmail.com>
Date:	Fri, 9 Nov 2012 20:57:58 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Al Viro <viro@...iv.linux.org.uk>
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 9, 2012 at 8:51 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> 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?

This is running on a x86_64 system; I believe the userspace binaries
should be 64-bit as well.

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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