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

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Message-ID: <4B2FA6D1.20408@web.de>
Date:	Mon, 21 Dec 2009 17:48:17 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Oleg Nesterov <oleg@...hat.com>
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

Oleg Nesterov wrote:
> 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.

Makes sense: that kernel (most probably) predates any debug register
virtualization in kvm.

> 
> Sorry for noise, thanks all for your help.

Never mind.

Jan


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