linux-kernel - Re: uml doesn't work on 2.6.24-rc2

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Message-Id: <E1IsFbA-0007y2-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 14 Nov 2007 11:35:56 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	jdike@...toit.com
CC:	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu
Subject: Re: uml doesn't work on 2.6.24-rc2

> On Wed, Nov 14, 2007 at 12:32:43AM +0100, Miklos Szeredi wrote:
> > UML doesn't run on 2.6.24-rc2 as host (config attached).  Guest is
> > 2.6.23-mm1, but I guess it's irrelevant.  2.6.23 as host was OK.
> > 
> > When booting there are zillions of lines like this:
> > 
> > "arch_switch_tls failed, errno = EINVAL"
> 
> This is PTRACE_ARCH_PRCTL failing and the only EINVAL I see is
> do_arch_prctl getting a bogus operation - something other than
> ARCH_[GS]ET_[FG]S, which is strange because UML never would have
> worked if it were passing in bogus arguments.

Note, this is 32bit UML on 64bit host, to complicate matters.  So I
think it's not PTRACE_ARCH_PRCTL, but PTRACE_SET_THREAD_AREA.

Maybe this is a fallout from the x86 architecture merge?

Tglx and mingo cc-d.

Miklos
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