Hi!
I'm sometimes getting segfaults when I kill qemu.
This time I caught it when qemu was under gdb:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x411d0940 (LWP 14446)]
0x000000000040afb4 in qemu_mod_timer (ts=0x19f0fd0, expire_time=62275467335)
at /home/mst/scm/qemu-kvm/vl.c:1009
1009 if ((alarm_timer->flags & ALARM_FLAG_EXPIRED) == 0) {
(gdb) l
1004 ts->next = *pt;
1005 *pt = ts;
1006
1007 /* Rearm if necessary */
1008 if (pt == &active_timers[ts->clock->type]) {
1009 if ((alarm_timer->flags & ALARM_FLAG_EXPIRED) == 0) {
1010 qemu_rearm_alarm_timer(alarm_timer);
1011 }
1012 /* Interrupt execution to force deadline recalculation. */
1013 if (use_icount)
(gdb) p alarm_timer
$1 = (struct qemu_alarm_timer *) 0x0
(gdb) where
#0 0x000000000040afb4 in qemu_mod_timer (ts=0x19f0fd0, expire_time=62275467335)
at /home/mst/scm/qemu-kvm/vl.c:1009
#1 0x000000000041aadf in virtio_net_handle_tx (vdev=<value optimized out>, vq=0x19f5af0)
at /home/mst/scm/qemu-kvm/hw/virtio-net.c:696
#2 0x0000000000421669 in kvm_run (vcpu=0x19d46a0, env=0x19c2250) at /home/mst/scm/qemu-kvm/qemu-kvm.c:797
#3 0x00000000004216d6 in kvm_cpu_exec (env=0x83d0f8) at /home/mst/scm/qemu-kvm/qemu-kvm.c:1714
#4 0x0000000000422981 in ap_main_loop (_env=<value optimized out>) at /home/mst/scm/qemu-kvm/qemu-kvm.c:1969
#5 0x000000377dc06367 in start_thread () from /lib64/libpthread.so.0
#6 0x000000377d0d30ad in clone () from /lib64/libc.so.6
(gdb)
So this probably means that we have already run quit_timers:
static void quit_timers(void)
{
alarm_timer->stop(alarm_timer);
alarm_timer = NULL;
}
but kvm vcpu thread is still running.
Not sure what the right fix is here: should we stop
kvm after main loop has exited?
--
MST
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