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

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788
Date	2017-06-07 01:50 +0200
Message-ID	<tPwox-7a2-1@gated-at.bofh.it> (permalink)
References	<tNH4J-lH-15@gated-at.bofh.it> <tPvsu-6yk-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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----- 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).

Paolo

Thread

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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