linux-kernel - Re: x86: do_debug && PTRACE_SINGLESTEP broken by 08d68323d1f0c34452e614263b212ca556dae47f

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Message-ID: <20091221165304.GA5061@redhat.com>
Date:	Mon, 21 Dec 2009 17:53:04 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Jan Kiszka <jan.kiszka@....de>
Cc:	Roland McGrath <roland@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	utrace-devel@...hat.com, Avi Kivity <avi@...hat.com>
Subject: Re: x86: do_debug && PTRACE_SINGLESTEP broken by
	08d68323d1f0c34452e614263b212ca556dae47f

On 12/21, Jan Kiszka wrote:
>
> Oleg Nesterov wrote:
> >
> > Hmm. Now I see how wrong I was when I said this code is "obviously wrong" ;)

Yes, it is easy to blame the code you don't understand.

My apologies to all.

> > I'll add the debugging printk's and report the output. Sorry for delay,
> > can't do this today.
>
> Can't reproduce, runs fine here with with 2.6.33-rc1 as both host&guest
> and qemu-kvm latest git. Host uses kvm-intel.

Everything runs fine under 2.6.32 as a _host_ kernel. Previously I did
the testing under 2.6.26.5-45.fc9.

Sorry for noise, thanks all for your help.

Oleg.

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