Re: [Qemu-devel] QEMU refusing to die on FreeBSD host

["M. Warner Losh" <imp@bsdimp.com>]

In message: <20080406163440.GA47504@saturn.kn-bremen.de>
            Juergen Lock <nox@jelal.kn-bremen.de> writes:
: On Sun, Apr 06, 2008 at 12:55:39AM -0400, Jake Myers wrote:
: > Hello,
: > 
: > On FreeBSD 7-STABLE, qemu refuses to exit even after the window is closed. 
: > It is stuck so badly that even kill -9 fails to stop it. I looked in top to 
: > see what it was doing that would cause it to lock so badly:
: > 
: > PID USERNAME    THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
: > 34859 root          1  -8   20   433M   416M devdrn   9:49  0.00% qemu
: > 
: > I believe the problem is that qemu for some reason refuses to stop trying 
: > to use the kqemu device.
: > 
: > I am running the latest qemu (0.9.1). I can provide a backtrace on request 
: > (I'm really busy right now with other things, so I didn't have time to 
: > attach one).
: 
: Yeah this looks like its the same FreeBSD 7.x/SMP issue that I already
: got reports of (refcount problem, similar to what has already been fixed
: once, only this time it seems to be a race...)
: 
:  If it is, you should be able to work around it by using an uniprocessor
: host kernel until a fix is known.

Well, reboot also works, since qemu that gets stuck will slowly be
paged out to the swap partition...  it isn't a huge deal from a
practical perspective...  Of course, this is just until the bug is
fixed...

Warner