Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788

From	Richard Weinberger <richard@nod.at>
Newsgroups	linux.kernel
Subject	Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788
Date	2017-06-07 09:40 +0200
Message-ID	<tPDJn-3zy-7@gated-at.bofh.it> (permalink)
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Andy, Paolo,

Am 07.06.2017 um 01:46 schrieb Paolo Bonzini:
> 
> 
> ----- Original Message -----
>> From: "Andy Lutomirski" <luto@kernel.org>
>> To: "Richard Weinberger" <richard@nod.at>, "Paolo Bonzini" <pbonzini@redhat.com>
>> Cc: "Andy Lutomirski" <luto@kernel.org>, "linux-x86 64" <linux-x86_64@vger.kernel.org>, linux-kernel@vger.kernel.org,
>> "Thomas Meyer" <thomas@m3y3r.de>
>> Sent: Wednesday, June 7, 2017 12:46:12 AM
>> Subject: Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788
>>
>> On Thu, Jun 1, 2017 at 3:46 PM, Richard Weinberger <richard@nod.at> wrote:
>>> Hi!
>>>
>>> UserModeLinux hits the following warning on the host.
>>> I've extracted the evil ptrace() command sequence, please see attached
>>> program,
>>> it triggers the warning too.
>>
>> This sounds like a known QEMU bug.  Paolo, did this get fixed in QEMU?
>> If so, what version?
> 
> If I understood what bug you are referring to, 2.9.0.  Commit c52ab08aee
> ("target-i386: Fix eflags.TF/#DB handling of syscall/sysret insns", 2016-12-22).

This makes sense. I'll update my qemu and test again.

Thanks,
//richard

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WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788 Richard Weinberger <richard@nod.at> - 2017-06-02 00:50 +0200
  Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788 Andy Lutomirski <luto@kernel.org> - 2017-06-07 00:50 +0200
    Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788 Paolo Bonzini <pbonzini@redhat.com> - 2017-06-07 01:50 +0200
      Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788 Richard Weinberger <richard@nod.at> - 2017-06-07 09:40 +0200

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