Issues with "x86, um: switch to generic fork/vfork/clone" commit

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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.

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