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


From: Luiz Capitulino
Subject: [Qemu-devel] [old BUG]: -watchdog-action pause hangs QEMU
Date: Thu, 26 Jun 2014 16:19:54 -0400

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



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