Hi Richard,
If setup qemu to use a watchdog with action pause, like this:
# qemu [...] -watchdog i6300esb -watchdog-action pause
qemu will completely hang when the watchdog fires. I started trying to
bisect, but I went as down as qemu v1.7.0 and the bug exists there.
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
