Message-ID: <4B2FA6D1.20408@web.de>
Date: Mon, 21 Dec 2009 17:48:17 +0100
From: Jan Kiszka <jan.kiszka@web.de>
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MIME-Version: 1.0
To: Oleg Nesterov <oleg@redhat.com>
CC: Roland McGrath <roland@redhat.com>,
       Frederic Weisbecker <fweisbec@gmail.com>, linux-kernel@vger.kernel.org,
       Alan Stern <stern@rowland.harvard.edu>, utrace-devel@redhat.com,
       Avi Kivity <avi@redhat.com>
Subject: Re: x86: do_debug && PTRACE_SINGLESTEP broken by	08d68323d1f0c34452e614263b212ca556dae47f
References: <20091218005650.GA20667@redhat.com> <20091218030601.GB16470@nowhere> <20091218172747.GA10924@redhat.com> <20091218200503.2CA0DF9A4@magilla.sf.frob.com> <20091218223230.GA1853@redhat.com> <4B2F4C58.8010303@web.de> <20091221165304.GA5061@redhat.com>
In-Reply-To: <20091221165304.GA5061@redhat.com>
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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 wr=
ong" ;)
>=20
> Yes, it is easy to blame the code you don't understand.
>=20
> My apologies to all.
>=20
>>> I'll add the debugging printk's and report the output. Sorry for dela=
y,
>>> can't do this today.
>> Can't reproduce, runs fine here with with 2.6.33-rc1 as both host&gues=
t
>> and qemu-kvm latest git. Host uses kvm-intel.
>=20
> 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.

>=20
> Sorry for noise, thanks all for your help.

Never mind.

Jan


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