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

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Date:   Tue, 6 Jun 2017 19:46:24 -0400 (EDT)
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Richard Weinberger <richard@....at>,
        linux-x86 64 <linux-x86_64@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Thomas Meyer <thomas@...3r.de>
Subject: Re: WARNING: CPU: 0 PID: 1752 at arch/x86/kernel/traps.c:788



----- Original Message -----
> From: "Andy Lutomirski" <luto@...nel.org>
> To: "Richard Weinberger" <richard@....at>, "Paolo Bonzini" <pbonzini@...hat.com>
> Cc: "Andy Lutomirski" <luto@...nel.org>, "linux-x86 64" <linux-x86_64@...r.kernel.org>, linux-kernel@...r.kernel.org,
> "Thomas Meyer" <thomas@...3r.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@....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