Re: [Qemu-devel] [old BUG]: -watchdog-action pause hangs QEMU

[Luiz Capitulino <lcapitulino@redhat.com>]

On Thu, 26 Jun 2014 23:24:09 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Il 26/06/2014 22:19, Luiz Capitulino ha scritto:
> > Here goes a gdb backtrace:
> >
> > #0  0x00007f298ce31759 in syscall () from /lib64/libc.so.6
> > #1  0x00007f29939b0b56 in futex_wait (ev=0x7f2994548f18, val=4294967295)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/util/qemu-thread-posix.c:304
> > #2  0x00007f29939b0c68 in qemu_event_wait (ev=0x7f2994548f18)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/util/qemu-thread-posix.c:400
> > #3  0x00007f299392a066 in qemu_clock_enable (type=QEMU_CLOCK_VIRTUAL, enabled=false)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/qemu-timer.c:171
> > #4  0x00007f2993653cc1 in pause_all_vcpus () at /home/lcapitulino/work/src/upstream/qmp-unstable/cpus.c:1078
> > #5  0x00007f2993652d3f in do_vm_stop (state=RUN_STATE_WATCHDOG) at /home/lcapitulino/work/src/upstream/qmp-unstable/cpus.c:532
> > #6  0x00007f2993654273 in vm_stop (state=RUN_STATE_WATCHDOG) at /home/lcapitulino/work/src/upstream/qmp-unstable/cpus.c:1221
> > #7  0x00007f29938c638d in watchdog_perform_action () at /home/lcapitulino/work/src/upstream/qmp-unstable/hw/watchdog/watchdog.c:126
> > #8  0x00007f29938c679d in i6300esb_timer_expired (vp=0x7f2994d17d40)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/hw/watchdog/wdt_i6300esb.c:197
> > #9  0x00007f299392a8ce in timerlist_run_timers (timer_list=0x7f2994548ec0)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/qemu-timer.c:491
> > #10 0x00007f299392a916 in qemu_clock_run_timers (type=QEMU_CLOCK_VIRTUAL)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/qemu-timer.c:502
> > #11 0x00007f299392abfe in qemu_clock_run_all_timers () at /home/lcapitulino/work/src/upstream/qmp-unstable/qemu-timer.c:608
> > #12 0x00007f299392956a in main_loop_wait (nonblocking=0) at /home/lcapitulino/work/src/upstream/qmp-unstable/main-loop.c:490
> > #13 0x00007f299374b40c in main_loop () at /home/lcapitulino/work/src/upstream/qmp-unstable/vl.c:2007
> > #14 0x00007f2993752e5d in main (argc=23, argv=0x7fffc6a5a738, envp=0x7fffc6a5a7f8)
> >     at /home/lcapitulino/work/src/upstream/qmp-unstable/vl.c:4526
> >
> 
> Can you include the backtrace for the VCPU thread(s) too?

Here you go, I start the guest with only one vCPU.

#0  0x00007f9d89d2a59d in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00007f9d89d26179 in _L_lock_814 () from /lib64/libpthread.so.0
#2  0x00007f9d89d26048 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00007f9d8b5b4687 in qemu_mutex_lock (mutex=0x7f9d8ba9c340 <qemu_global_mutex>) at /home/lcapitulino/work/src/upstream/qmp-unstable/util/qemu-thread-posix.c:76
#4  0x00007f9d8b257c02 in qemu_mutex_lock_iothread () at /home/lcapitulino/work/src/upstream/qmp-unstable/cpus.c:1044
#5  0x00007f9d8b26e8bb in kvm_cpu_exec (cpu=0x7f9d8e04b830) at /home/lcapitulino/work/src/upstream/qmp-unstable/kvm-all.c:1716
#6  0x00007f9d8b2577c5 in qemu_kvm_cpu_thread_fn (arg=0x7f9d8e04b830) at /home/lcapitulino/work/src/upstream/qmp-unstable/cpus.c:874
#7  0x00007f9d89d23f33 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f9d84a3aded in clone () from /lib64/libc.so.6