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

[Paolo Bonzini]

----- Original Message -----
> From: "Andy Lutomirski" <luto@xxxxxxxxxx>
> To: "Richard Weinberger" <richard@xxxxxx>, "Paolo Bonzini" <pbonzini@xxxxxxxxxx>
> Cc: "Andy Lutomirski" <luto@xxxxxxxxxx>, "linux-x86 64" <linux-x86_64@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx,
> "Thomas Meyer" <thomas@xxxxxxxx>
> 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@xxxxxx> 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