From 2ef45716e1d4820f10a90ee2f17a9cb4fe5a8806 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Mon, 1 Aug 2016 15:23:42 +0400 Subject: [PATCH 1/2] monitor: fix crash when leaving qemu with spice audio MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since aa5cb7f5e, 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 #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 #5 0x0000555555787cad in monitor_flush_locked (mon=0x5555567bd9e0) at /home/elmarco/src/qemu/monitor.c:311 #6 0x0000555555787e46 in monitor_puts (mon=0x5555567bd9e0, str=0x5555567a44ef "") at /home/elmarco/src/qemu/monitor.c:353 #7 0x00005555557880fe in monitor_json_emitter (mon=0x5555567bd9e0, data=0x5555567c73a0) at /home/elmarco/src/qemu/monitor.c:401 #8 0x00005555557882d2 in monitor_qapi_event_emit (event=QAPI_EVENT_SPICE_DISCONNECTED, qdict=0x5555567c73a0) at /home/elmarco/src/qemu/monitor.c:472 #9 0x000055555578838f in monitor_qapi_event_queue (event=QAPI_EVENT_SPICE_DISCONNECTED, qdict=0x5555567c73a0, errp=0x7fffffffca88) at /home/elmarco/src/qemu/monitor.c:497 #10 0x0000555555c15541 in qapi_event_send_spice_disconnected (server=0x5555571139d0, client=0x5555570d0db0, errp=0x5555566c0428 ) at qapi-event.c:1038 #11 0x0000555555b11bc6 in channel_event (event=3, info=0x5555570d6c00) at ui/spice-core.c:248 #12 0x00007fffdcc9983a in adapter_channel_event (event=3, info=0x5555570d6c00) at reds.c:120 #13 0x00007fffdcc99a25 in reds_handle_channel_event (reds=0x5555567a9d60, event=3, info=0x5555570d6c00) at reds.c:324 #14 0x00007fffdcc7d4c4 in main_dispatcher_self_handle_channel_event (self=0x5555567b28b0, event=3, info=0x5555570d6c00) at main-dispatcher.c:175 #15 0x00007fffdcc7d5b1 in main_dispatcher_channel_event (self=0x5555567b28b0, event=3, info=0x5555570d6c00) at main-dispatcher.c:194 #16 0x00007fffdcca7674 in reds_stream_push_channel_event (s=0x5555570d9910, event=3) at reds-stream.c:354 #17 0x00007fffdcca749b in reds_stream_free (s=0x5555570d9910) at reds-stream.c:323 #18 0x00007fffdccb5dad in snd_disconnect_channel (channel=0x5555576a89a0) at sound.c:229 #19 0x00007fffdccb9e57 in snd_detach_common (worker=0x555557739720) at sound.c:1589 #20 0x00007fffdccb9f0e in snd_detach_playback (sin=0x5555569fe3f8) at sound.c:1602 #21 0x00007fffdcca3373 in spice_server_remove_interface (sin=0x5555569fe3f8) at reds.c:3387 #22 0x00005555558ff6e2 in line_out_fini (hw=0x5555569fe370) at audio/spiceaudio.c:152 #23 0x00005555558f909e in audio_atexit () at audio/audio.c:1754 #24 0x00007fffdb1941e8 in __run_exit_handlers (status=0, listp=0x7fffdb5175d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82 #25 0x00007fffdb194235 in __GI_exit (status=) at exit.c:104 #26 0x00007fffdb17b738 in __libc_start_main (main=0x5555558d7874
, argc=67, argv=0x7fffffffcf48, init=, fini=, rtld_fini=, 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 Message-Id: <20160801112343.29082-2-marcandre.lureau@redhat.com> Reviewed-by: Paolo Bonzini Reviewed-by: Markus Armbruster Signed-off-by: Markus Armbruster --- include/monitor/monitor.h | 1 + monitor.c | 20 ++++++++++++++++++++ vl.c | 1 + 3 files changed, 22 insertions(+) diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h index c5c9ea292f..a714d8ef80 100644 --- a/include/monitor/monitor.h +++ b/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 --git a/monitor.c b/monitor.c index 5d68a5d6fc..5c003731e2 100644 --- a/monitor.c +++ b/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 --git a/vl.c b/vl.c index e7c2c628de..a14c438d38 100644 --- a/vl.c +++ b/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; From a384c205acaa4b6fe6d4d392af47b49b2c448eb4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Mon, 1 Aug 2016 15:23:43 +0400 Subject: [PATCH 2/2] audio: clean up before monitor clean up MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since aa5cb7f5e, the chardevs are being cleaned up when leaving qemu, before the atexit() handlers. audio_cleanup() may use the monitor to notify of changes. For compatibility reasons, let's clean up audio before the monitor so it keeps emitting monitor events. The audio_atexit() function is made idempotent (so it can be called multiple times), and renamed to audio_cleanup(). Since coreaudio backend is using a 'isAtexit' code path, change it to check audio_is_cleaning_up() instead, so the path is taken during normal exit. Signed-off-by: Marc-André Lureau Message-Id: <20160801112343.29082-3-marcandre.lureau@redhat.com> Reviewed-by: Paolo Bonzini Reviewed-by: Gerd Hoffmann Signed-off-by: Markus Armbruster --- audio/audio.c | 26 ++++++++++++++++++-------- audio/audio.h | 3 +++ audio/coreaudio.c | 12 ++---------- vl.c | 1 + 4 files changed, 24 insertions(+), 18 deletions(-) diff --git a/audio/audio.c b/audio/audio.c index 9d4dcc72dd..c845a44f0a 100644 --- a/audio/audio.c +++ b/audio/audio.c @@ -1739,13 +1739,21 @@ static void audio_vm_change_state_handler (void *opaque, int running, audio_reset_timer (s); } -static void audio_atexit (void) +static bool is_cleaning_up; + +bool audio_is_cleaning_up(void) +{ + return is_cleaning_up; +} + +void audio_cleanup(void) { AudioState *s = &glob_audio_state; - HWVoiceOut *hwo = NULL; - HWVoiceIn *hwi = NULL; + HWVoiceOut *hwo, *hwon; + HWVoiceIn *hwi, *hwin; - while ((hwo = audio_pcm_hw_find_any_out (hwo))) { + is_cleaning_up = true; + QLIST_FOREACH_SAFE(hwo, &glob_audio_state.hw_head_out, entries, hwon) { SWVoiceCap *sc; if (hwo->enabled) { @@ -1761,17 +1769,20 @@ static void audio_atexit (void) cb->ops.destroy (cb->opaque); } } + QLIST_REMOVE(hwo, entries); } - while ((hwi = audio_pcm_hw_find_any_in (hwi))) { + QLIST_FOREACH_SAFE(hwi, &glob_audio_state.hw_head_in, entries, hwin) { if (hwi->enabled) { hwi->pcm_ops->ctl_in (hwi, VOICE_DISABLE); } hwi->pcm_ops->fini_in (hwi); + QLIST_REMOVE(hwi, entries); } if (s->drv) { s->drv->fini (s->drv_opaque); + s->drv = NULL; } } @@ -1799,7 +1810,7 @@ static void audio_init (void) QLIST_INIT (&s->hw_head_out); QLIST_INIT (&s->hw_head_in); QLIST_INIT (&s->cap_head); - atexit (audio_atexit); + atexit(audio_cleanup); s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s); @@ -1966,8 +1977,7 @@ CaptureVoiceOut *AUD_add_capture ( QLIST_INSERT_HEAD (&s->cap_head, cap, entries); QLIST_INSERT_HEAD (&cap->cb_head, cb, entries); - hw = NULL; - while ((hw = audio_pcm_hw_find_any_out (hw))) { + QLIST_FOREACH(hw, &glob_audio_state.hw_head_out, entries) { audio_attach_capture (hw); } return cap; diff --git a/audio/audio.h b/audio/audio.h index 11e56c9d17..c3c51988f5 100644 --- a/audio/audio.h +++ b/audio/audio.h @@ -163,4 +163,7 @@ static inline void *advance (void *p, int incr) int wav_start_capture (CaptureState *s, const char *path, int freq, int bits, int nchannels); +bool audio_is_cleaning_up(void); +void audio_cleanup(void); + #endif /* QEMU_AUDIO_H */ diff --git a/audio/coreaudio.c b/audio/coreaudio.c index d4ad224590..c75142084f 100644 --- a/audio/coreaudio.c +++ b/audio/coreaudio.c @@ -36,8 +36,6 @@ #define MAC_OS_X_VERSION_10_6 1060 #endif -static int isAtexit; - typedef struct { int buffer_frames; int nbuffers; @@ -378,11 +376,6 @@ static inline UInt32 isPlaying (AudioDeviceID outputDeviceID) return result; } -static void coreaudio_atexit (void) -{ - isAtexit = 1; -} - static int coreaudio_lock (coreaudioVoiceOut *core, const char *fn_name) { int err; @@ -630,7 +623,7 @@ static void coreaudio_fini_out (HWVoiceOut *hw) int err; coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw; - if (!isAtexit) { + if (!audio_is_cleaning_up()) { /* stop playback */ if (isPlaying(core->outputDeviceID)) { status = AudioDeviceStop(core->outputDeviceID, core->ioprocid); @@ -673,7 +666,7 @@ static int coreaudio_ctl_out (HWVoiceOut *hw, int cmd, ...) case VOICE_DISABLE: /* stop playback */ - if (!isAtexit) { + if (!audio_is_cleaning_up()) { if (isPlaying(core->outputDeviceID)) { status = AudioDeviceStop(core->outputDeviceID, core->ioprocid); @@ -697,7 +690,6 @@ static void *coreaudio_audio_init (void) CoreaudioConf *conf = g_malloc(sizeof(CoreaudioConf)); *conf = glob_conf; - atexit(coreaudio_atexit); return conf; } diff --git a/vl.c b/vl.c index a14c438d38..c4eeaffb91 100644 --- a/vl.c +++ b/vl.c @@ -4612,6 +4612,7 @@ int main(int argc, char **argv, char **envp) /* vhost-user must be cleaned up before chardevs. */ net_cleanup(); + audio_cleanup(); monitor_cleanup(); qemu_chr_cleanup();