monitor: fix crash when leaving qemu with spice audio

Since aa5cb7f, the chardevs are being cleaned up when leaving
qemu. However, the monitor has still references to them, which may
lead to crashes when running atexit() and trying to send monitor
events:

 #0  0x00007fffdb18f6f5 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
 #1  0x00007fffdb1912fa in __GI_abort () at abort.c:89
 #2  0x0000555555c263e7 in error_exit (err=22, msg=0x555555d47980 <__func__.13537> "qemu_mutex_lock") at util/qemu-thread-posix.c:39
 #3  0x0000555555c26488 in qemu_mutex_lock (mutex=0x5555567a2420) at util/qemu-thread-posix.c:66
 open-power-host-os#4  0x00005555558c52db in qemu_chr_fe_write (s=0x5555567a2420, buf=0x55555740dc40 "{\"timestamp\": {\"seconds\": 1470041716, \"microseconds\": 989699}, \"event\": \"SPICE_DISCONNECTED\", \"data\": {\"server\": {\"port\": \"5900\", \"family\": \"ipv4\", \"host\": \"127.0.0.1\"}, \"client\": {\"port\": \"40272\", \"f"..., len=240) at qemu-char.c:280
 open-power-host-os#5  0x0000555555787cad in monitor_flush_locked (mon=0x5555567bd9e0) at /home/elmarco/src/qemu/monitor.c:311
 open-power-host-os#6  0x0000555555787e46 in monitor_puts (mon=0x5555567bd9e0, str=0x5555567a44ef "") at /home/elmarco/src/qemu/monitor.c:353
 open-power-host-os#7  0x00005555557880fe in monitor_json_emitter (mon=0x5555567bd9e0, data=0x5555567c73a0) at /home/elmarco/src/qemu/monitor.c:401
 open-power-host-os#8  0x00005555557882d2 in monitor_qapi_event_emit (event=QAPI_EVENT_SPICE_DISCONNECTED, qdict=0x5555567c73a0) at /home/elmarco/src/qemu/monitor.c:472
 open-power-host-os#9  0x000055555578838f in monitor_qapi_event_queue (event=QAPI_EVENT_SPICE_DISCONNECTED, qdict=0x5555567c73a0, errp=0x7fffffffca88) at /home/elmarco/src/qemu/monitor.c:497
 open-power-host-os#10 0x0000555555c15541 in qapi_event_send_spice_disconnected (server=0x5555571139d0, client=0x5555570d0db0, errp=0x5555566c0428 <error_abort>) at qapi-event.c:1038
 open-power-host-os#11 0x0000555555b11bc6 in channel_event (event=3, info=0x5555570d6c00) at ui/spice-core.c:248
 open-power-host-os#12 0x00007fffdcc9983a in adapter_channel_event (event=3, info=0x5555570d6c00) at reds.c:120
 open-power-host-os#13 0x00007fffdcc99a25 in reds_handle_channel_event (reds=0x5555567a9d60, event=3, info=0x5555570d6c00) at reds.c:324
 open-power-host-os#14 0x00007fffdcc7d4c4 in main_dispatcher_self_handle_channel_event (self=0x5555567b28b0, event=3, info=0x5555570d6c00) at main-dispatcher.c:175
 open-power-host-os#15 0x00007fffdcc7d5b1 in main_dispatcher_channel_event (self=0x5555567b28b0, event=3, info=0x5555570d6c00) at main-dispatcher.c:194
 open-power-host-os#16 0x00007fffdcca7674 in reds_stream_push_channel_event (s=0x5555570d9910, event=3) at reds-stream.c:354
 open-power-host-os#17 0x00007fffdcca749b in reds_stream_free (s=0x5555570d9910) at reds-stream.c:323
 open-power-host-os#18 0x00007fffdccb5dad in snd_disconnect_channel (channel=0x5555576a89a0) at sound.c:229
 open-power-host-os#19 0x00007fffdccb9e57 in snd_detach_common (worker=0x555557739720) at sound.c:1589
 open-power-host-os#20 0x00007fffdccb9f0e in snd_detach_playback (sin=0x5555569fe3f8) at sound.c:1602
 open-power-host-os#21 0x00007fffdcca3373 in spice_server_remove_interface (sin=0x5555569fe3f8) at reds.c:3387
 open-power-host-os#22 0x00005555558ff6e2 in line_out_fini (hw=0x5555569fe370) at audio/spiceaudio.c:152
 open-power-host-os#23 0x00005555558f909e in audio_atexit () at audio/audio.c:1754
 open-power-host-os#24 0x00007fffdb1941e8 in __run_exit_handlers (status=0, listp=0x7fffdb5175d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
 open-power-host-os#25 0x00007fffdb194235 in __GI_exit (status=<optimized out>) at exit.c:104
 open-power-host-os#26 0x00007fffdb17b738 in __libc_start_main (main=0x5555558d7874 <main>, argc=67, argv=0x7fffffffcf48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffcf38) at ../csu/libc-start.c:323

Add a monitor_cleanup() functions to remove all the monitors before
cleaning up the chardev. Note that we are "losing" some events that
used to be sent during atexit().

Signed-off-by: Marc-André Lureau <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Reviewed-by: Markus Armbruster <[email protected]>
Signed-off-by: Markus Armbruster <[email protected]>

Author: elmarco

Diff for: include/monitor/monitor.h

@@ -17,6 +17,7 @@ extern Monitor *cur_mon;
 bool monitor_cur_is_qmp(void);
 
 void monitor_init(CharDriverState *chr, int flags);
+void monitor_cleanup(void);
 
 int monitor_suspend(Monitor *mon);
 void monitor_resume(Monitor *mon);

Diff for: monitor.c

@@ -635,6 +635,13 @@ static void monitor_data_init(Monitor *mon)
 
 static void monitor_data_destroy(Monitor *mon)
 {
+    if (mon->chr) {
+        qemu_chr_add_handlers(mon->chr, NULL, NULL, NULL, NULL);
+    }
+    if (monitor_is_qmp(mon)) {
+        json_message_parser_destroy(&mon->qmp.parser);
+    }
+    g_free(mon->rs);
     QDECREF(mon->outbuf);
     qemu_mutex_destroy(&mon->out_lock);
 }
@@ -4196,6 +4203,19 @@ void monitor_init(CharDriverState *chr, int flags)
     qemu_mutex_unlock(&monitor_lock);
 }
 
+void monitor_cleanup(void)
+{
+    Monitor *mon, *next;
+
+    qemu_mutex_lock(&monitor_lock);
+    QLIST_FOREACH_SAFE(mon, &mon_list, entry, next) {
+        QLIST_REMOVE(mon, entry);
+        monitor_data_destroy(mon);
+        g_free(mon);
+    }
+    qemu_mutex_unlock(&monitor_lock);
+}
+
 static void bdrv_password_cb(void *opaque, const char *password,
                              void *readline_opaque)
 {

Diff for: vl.c

@@ -4612,6 +4612,7 @@ int main(int argc, char **argv, char **envp)
 
     /* vhost-user must be cleaned up before chardevs.  */
     net_cleanup();
+    monitor_cleanup();
     qemu_chr_cleanup();
 
     return 0;