Mixing audio and video with `matroskamux` causing deadlocks

[pyldin601]

Test pipeline:

cefbin name=cef cefsrc::url="https://soundcloud.com/platform/sama" \
audiotestsrc do-timestamp=true is-live=true volume=0.0 ! audiomixer name=mixer \
mixer. ! audioconvert ! queue ! matroskamux streamable=true name=muxer ! queue ! fakesink sync=1 \
cef.audio ! queue ! audioconvert ! mixer. \
cef.video ! video/x-raw, width=1920, height=1080 ! videoconvert ! queue ! muxer.

When I launch this pipeline with gst-launch-1.0 it stuck at random time positions. Here's gdb backtrace when it happens:

[New LWP 10188]
[New LWP 10189]
[New LWP 10190]
[New LWP 10191]
[New LWP 10192]
[New LWP 10193]
[New LWP 10194]
[New LWP 10195]
[New LWP 10196]
[New LWP 10199]
[New LWP 10200]
[New LWP 10202]
[New LWP 10204]
[New LWP 10205]
[New LWP 10207]
[New LWP 10208]
[New LWP 10209]
[New LWP 10210]
[New LWP 10214]
[New LWP 10215]
[New LWP 10224]
[New LWP 10236]
[New LWP 10280]
[New LWP 10288]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
0x0000ffff97adbc78 in __GI___poll (fds=0xaaab02ed7770, nfds=2, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:41
41	../sysdeps/unix/sysv/linux/poll.c: No such file or directory.

Thread 25 (Thread 0xffff1e00b980 (LWP 10288) "AudioInputDevic"):
#0  __GI___libc_read (nbytes=4, buf=0xffff1e00b024, fd=<optimized out>) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=<optimized out>, buf=0xffff1e00b024, nbytes=4) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x0000ffff9d38cfa8 in base::ReadFromFD(int, char*, unsigned long) () at ../../base/files/file_util_posix.cc:462
#3  0x0000ffff9d393d94 [PAC] in Receive() () at ../../base/sync_socket_posix.cc:107
#4  0x0000ffff9a93649c [PAC] in ThreadMain() () at ../../media/audio/audio_device_thread.cc:84
#5  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#6  0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#7  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 24 (Thread 0xffff1e81b980 (LWP 10280) "BatteryStatusNo"):
#0  0x0000ffff97ae5ebc in __GI_epoll_pwait (epfd=<optimized out>, events=0xffff08002360, maxevents=32, timeout=-1, set=0x0) at ../sysdeps/unix/sysv/linux/epoll_pwait.c:40
#1  0x0000ffff9d4cd324 in epoll_dispatch () at ../../third_party/libevent/epoll.c:198
#2  0x0000ffff9d4caddc [PAC] in event_base_loop () at ../../third_party/libevent/event.c:512
#3  0x0000ffff9d3a2470 [PAC] in Run() () at ../../base/message_loop/message_pump_libevent.cc:356
#4  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#5  0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#6  0x0000ffff9d3754cc [PAC] in base::Thread::Run(base::RunLoop*) () at ../../base/threading/thread.cc:337
#7  0x0000ffff9d375654 [PAC] in ThreadMain() () at ../../base/threading/thread.cc:408
#8  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#9  0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#10 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 23 (Thread 0xffff51fbe980 (LWP 10236) "gmain"):
#0  0x0000ffff97adbc78 in __GI___poll (fds=0xaaab02ecb610, nfds=1, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:41
#1  0x0000ffff97cdb738 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff97c82f14 in g_main_context_iteration () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#3  0x0000ffff97c82f6c in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#4  0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#5  0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#6  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 22 (Thread 0xffff527ce980 (LWP 10224) "cefsrc:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff9493935c in gst_queue_chain_buffer_or_list (pad=0xaaab02e86ea0 [GstPad|sink], parent=0xaaab02e8e420 [GstObject|audio-queue], obj=0xffff7c01bc60, is_list=0) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1251
#3  0x0000ffff94939a80 in gst_queue_chain (pad=0xaaab02e86ea0 [GstPad|sink], parent=0xaaab02e8e420 [GstObject|audio-queue], buffer=0xffff7c01bc60) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1349
#4  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02e86ea0 [GstPad|sink], type=4112, data=0xffff7c01bc60) at ../subprojects/gstreamer/gst/gstpad.c:4447
#5  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e867b0 [GstPad|audio], type=4112, data=0xffff7c01bc60) at ../subprojects/gstreamer/gst/gstpad.c:4711
#6  0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e867b0 [GstPad|audio], buffer=0xffff7c01bc60) at ../subprojects/gstreamer/gst/gstpad.c:4830
#7  0x0000ffff94d803f4 in gst_cef_demux_push_audio_buffer(_GstBuffer**, unsigned int, AudioPushData*) () at /usr/cef/libgstcef.so
#8  0x0000ffff97ddb0c4 in gst_buffer_list_foreach (list=0xffff0c006570, func=0xffff94d803b0 <gst_cef_demux_push_audio_buffer(_GstBuffer**, unsigned int, AudioPushData*)>, user_data=0xffff527cdc18) at ../subprojects/gstreamer/gst/gstbufferlist.c:280
#9  0x0000ffff94d80790 in gst_cef_demux_chain(_GstPad*, _GstObject*, _GstBuffer*) () at /usr/cef/libgstcef.so
#10 0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02e86310 [GstPad|sink], type=4112, data=0xffff8400a5a0) at ../subprojects/gstreamer/gst/gstpad.c:4447
#11 0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e860c0 [GstPad|src], type=4112, data=0xffff8400a5a0) at ../subprojects/gstreamer/gst/gstpad.c:4711
#12 0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e860c0 [GstPad|src], buffer=0xffff8400a5a0) at ../subprojects/gstreamer/gst/gstpad.c:4830
#13 0x0000ffff94b291d8 in gst_base_src_loop (pad=0xaaab02e860c0 [GstPad|src]) at ../subprojects/gstreamer/libs/gst/base/gstbasesrc.c:3030
#14 0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed4830 [GstTask|cefsrc:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#15 0x0000ffff97e802bc in default_func (tdata=0xaaab02e7ae20, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#16 0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#17 0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#18 0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#19 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 21 (Thread 0xffff52fde980 (LWP 10215) "ThreadPoolSingl"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0xffff52fdde40) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0, futex_word=0xffff52fdde40) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff52fdde40, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7c8fc in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xffff52fddde8, cond=0xffff52fdde18) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0xffff52fdde18, mutex=0xffff52fddde8) at ./nptl/pthread_cond_wait.c:627
#5  0x0000ffff9d394224 in Wait() () at ../../base/synchronization/condition_variable_posix.cc:79
#6  0x0000ffff9d394b0c [PAC] in TimedWait() () at ../../base/synchronization/waitable_event_posix.cc:212
#7  0x0000ffff9d36c224 [PAC] in base::internal::WorkerThread::Delegate::WaitForWork(base::WaitableEvent*) () at ../../base/task/thread_pool/worker_thread.cc:132
#8  0x0000ffff9d36ccb4 [PAC] in RunWorker() () at ../../base/task/thread_pool/worker_thread.cc:439
#9  0x0000ffff9d36c94c [PAC] in base::internal::WorkerThread::RunSharedWorker() () at ../../base/task/thread_pool/worker_thread.cc:345
#10 0x0000ffff9d36c834 [PAC] in ThreadMain() () at ../../base/task/thread_pool/worker_thread.cc:318
#11 0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#12 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#13 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 20 (Thread 0xffff537ee980 (LWP 10214) "CacheThread_Blo"):
#0  0x0000ffff97ae5ebc in __GI_epoll_pwait (epfd=<optimized out>, events=0xffff28002360, maxevents=32, timeout=30000, set=0x0) at ../sysdeps/unix/sysv/linux/epoll_pwait.c:40
#1  0x0000ffff9d4cd324 in epoll_dispatch () at ../../third_party/libevent/epoll.c:198
#2  0x0000ffff9d4caddc [PAC] in event_base_loop () at ../../third_party/libevent/event.c:512
#3  0x0000ffff9d3a2594 [PAC] in Run() () at ../../base/message_loop/message_pump_libevent.cc:356
#4  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#5  0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#6  0x0000ffff9d3754cc [PAC] in base::Thread::Run(base::RunLoop*) () at ../../base/threading/thread.cc:337
#7  0x0000ffff9d375654 [PAC] in ThreadMain() () at ../../base/threading/thread.cc:408
#8  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#9  0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#10 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 19 (Thread 0xffff58f9e980 (LWP 10210) "VideoCaptureThr"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0xffff58f9dd20) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0, futex_word=0xffff58f9dd20) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff58f9dd20, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7c8fc in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xffff58f9dcc8, cond=0xffff58f9dcf8) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0xffff58f9dcf8, mutex=0xffff58f9dcc8) at ./nptl/pthread_cond_wait.c:627
#5  0x0000ffff9d394224 in Wait() () at ../../base/synchronization/condition_variable_posix.cc:79
#6  0x0000ffff9d394b0c [PAC] in TimedWait() () at ../../base/synchronization/waitable_event_posix.cc:212
#7  0x0000ffff9d394800 [PAC] in base::WaitableEvent::Wait() () at ../../base/synchronization/waitable_event_posix.cc:158
#8  0x0000ffff9d30a438 [PAC] in Run() () at ../../base/message_loop/message_pump_default.cc:55
#9  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#10 0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#11 0x0000ffff9d3754cc [PAC] in base::Thread::Run(base::RunLoop*) () at ../../base/threading/thread.cc:337
#12 0x0000ffff9d375654 [PAC] in ThreadMain() () at ../../base/threading/thread.cc:408
#13 0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#14 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#15 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 18 (Thread 0xffff597ae980 (LWP 10209) "ThreadPoolSingl"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0xffff597ade40) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0, futex_word=0xffff597ade40) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff597ade40, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7c8fc in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xffff597adde8, cond=0xffff597ade18) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0xffff597ade18, mutex=0xffff597adde8) at ./nptl/pthread_cond_wait.c:627
#5  0x0000ffff9d394224 in Wait() () at ../../base/synchronization/condition_variable_posix.cc:79
#6  0x0000ffff9d394b0c [PAC] in TimedWait() () at ../../base/synchronization/waitable_event_posix.cc:212
#7  0x0000ffff9d36c224 [PAC] in base::internal::WorkerThread::Delegate::WaitForWork(base::WaitableEvent*) () at ../../base/task/thread_pool/worker_thread.cc:132
#8  0x0000ffff9d36ccb4 [PAC] in RunWorker() () at ../../base/task/thread_pool/worker_thread.cc:439
#9  0x0000ffff9d36c980 [PAC] in base::internal::WorkerThread::RunDedicatedWorker() () at ../../base/task/thread_pool/worker_thread.cc:355
#10 0x0000ffff9d36c828 [PAC] in ThreadMain() () at ../../base/task/thread_pool/worker_thread.cc:321
#11 0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#12 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#13 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 17 (Thread 0xffff59fbe980 (LWP 10208) "CompositorTileW"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0xffff700ae704) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0, futex_word=0xffff700ae704) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff700ae704, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7c8fc in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xffff700ae668, cond=0xffff700ae6d8) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0xffff700ae6d8, mutex=0xffff700ae668) at ./nptl/pthread_cond_wait.c:627
#5  0x0000ffff9d394224 in Wait() () at ../../base/synchronization/condition_variable_posix.cc:79
#6  0x0000ffff9e96ab14 [PAC] in non-virtual thunk to cc::SingleThreadTaskGraphRunner::Run() () at ../../cc/raster/single_thread_task_graph_runner.cc:129
#7  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#8  0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#9  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 16 (Thread 0xffff5a7ce980 (LWP 10207) "inotify_reader"):
#0  0x0000ffff97adbc78 in __GI___poll (fds=0xffff5a7cdfc0, nfds=1, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:41
#1  0x0000ffff9d39c9f8 in ThreadMain() () at ../../base/files/file_path_watcher_inotify.cc:295
#2  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#3  0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#4  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 15 (Thread 0xffff5b7ee980 (LWP 10205) "ThreadPoolSingl"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0xffff5b7ede40) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0, futex_word=0xffff5b7ede40) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff5b7ede40, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7c8fc in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xffff5b7edde8, cond=0xffff5b7ede18) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0xffff5b7ede18, mutex=0xffff5b7edde8) at ./nptl/pthread_cond_wait.c:627
#5  0x0000ffff9d394224 in Wait() () at ../../base/synchronization/condition_variable_posix.cc:79
#6  0x0000ffff9d394b0c [PAC] in TimedWait() () at ../../base/synchronization/waitable_event_posix.cc:212
#7  0x0000ffff9d36c224 [PAC] in base::internal::WorkerThread::Delegate::WaitForWork(base::WaitableEvent*) () at ../../base/task/thread_pool/worker_thread.cc:132
#8  0x0000ffff9d36ccb4 [PAC] in RunWorker() () at ../../base/task/thread_pool/worker_thread.cc:439
#9  0x0000ffff9d36c94c [PAC] in base::internal::WorkerThread::RunSharedWorker() () at ../../base/task/thread_pool/worker_thread.cc:345
#10 0x0000ffff9d36c834 [PAC] in ThreadMain() () at ../../base/task/thread_pool/worker_thread.cc:318
#11 0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#12 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#13 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 14 (Thread 0xffff53ffe980 (LWP 10204) "MemoryInfra"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0xffff53ffdd20) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0, futex_word=0xffff53ffdd20) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff53ffdd20, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7c8fc in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xffff53ffdcc8, cond=0xffff53ffdcf8) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0xffff53ffdcf8, mutex=0xffff53ffdcc8) at ./nptl/pthread_cond_wait.c:627
#5  0x0000ffff9d394224 in Wait() () at ../../base/synchronization/condition_variable_posix.cc:79
#6  0x0000ffff9d394b0c [PAC] in TimedWait() () at ../../base/synchronization/waitable_event_posix.cc:212
#7  0x0000ffff9d394800 [PAC] in base::WaitableEvent::Wait() () at ../../base/synchronization/waitable_event_posix.cc:158
#8  0x0000ffff9d30a438 [PAC] in Run() () at ../../base/message_loop/message_pump_default.cc:55
#9  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#10 0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#11 0x0000ffff9d3754cc [PAC] in base::Thread::Run(base::RunLoop*) () at ../../base/threading/thread.cc:337
#12 0x0000ffff9d375654 [PAC] in ThreadMain() () at ../../base/threading/thread.cc:408
#13 0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#14 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#15 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 13 (Thread 0xffff80eb5980 (LWP 10202) "Chrome_IOThread"):
#0  0x0000ffff97ae5ebc in __GI_epoll_pwait (epfd=<optimized out>, events=0xffff54002360, maxevents=32, timeout=18139, set=0x0) at ../sysdeps/unix/sysv/linux/epoll_pwait.c:40
#1  0x0000ffff9d4cd324 in epoll_dispatch () at ../../third_party/libevent/epoll.c:198
#2  0x0000ffff9d4caddc [PAC] in event_base_loop () at ../../third_party/libevent/event.c:512
#3  0x0000ffff9d3a2594 [PAC] in Run() () at ../../base/message_loop/message_pump_libevent.cc:356
#4  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#5  0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#6  0x0000ffff9d3754cc [PAC] in base::Thread::Run(base::RunLoop*) () at ../../base/threading/thread.cc:337
#7  0x0000ffff9b38cfc0 [PAC] in content::BrowserProcessIOThread::IOThreadRun(base::RunLoop*) () at ../../content/browser/browser_process_io_thread.cc:119
#8  0x0000ffff9d375654 [PAC] in ThreadMain() () at ../../base/threading/thread.cc:408
#9  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#10 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#11 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 12 (Thread 0xffff81ed5980 (LWP 10200) "ThreadPoolForeg"):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0xffff81ed4ce0, op=137, expected=0, futex_word=0xffff81ed4e40) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0xffff81ed4ce0, clockid=-1750622760, expected=0, futex_word=0xffff81ed4e40) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0xffff81ed4e40, expected=expected@entry=0, clockid=clockid@entry=1, abstime=abstime@entry=0xffff81ed4ce0, private=private@entry=0) at ./nptl/futex-internal.c:139
#3  0x0000ffff97a7cc10 in __pthread_cond_wait_common (abstime=0xffff81ed4ce0, clockid=1, mutex=0xffff81ed4de8, cond=0xffff81ed4e18) at ./nptl/pthread_cond_wait.c:503
#4  ___pthread_cond_timedwait64 (cond=0xffff81ed4e18, mutex=0xffff81ed4de8, abstime=0xffff81ed4ce0) at ./nptl/pthread_cond_wait.c:652
#5  0x0000ffff9d39438c in TimedWait() () at ../../base/synchronization/condition_variable_posix.cc:132
#6  0x0000ffff9d394b20 [PAC] in TimedWait() () at ../../base/synchronization/waitable_event_posix.cc:214
#7  0x0000ffff9d36c224 [PAC] in base::internal::WorkerThread::Delegate::WaitForWork(base::WaitableEvent*) () at ../../base/task/thread_pool/worker_thread.cc:132
#8  0x0000ffff9d36ccb4 [PAC] in RunWorker() () at ../../base/task/thread_pool/worker_thread.cc:439
#9  0x0000ffff9d36c918 [PAC] in base::internal::WorkerThread::RunPooledWorker() () at ../../base/task/thread_pool/worker_thread.cc:335
#10 0x0000ffff9d36c7ec [PAC] in ThreadMain() () at ../../base/task/thread_pool/worker_thread.cc:315
#11 0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#12 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#13 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 11 (Thread 0xffff826e5980 (LWP 10199) "ThreadPoolServi"):
#0  0x0000ffff97ae5ebc in __GI_epoll_pwait (epfd=<optimized out>, events=0xffff68002390, maxevents=32, timeout=-1, set=0x0) at ../sysdeps/unix/sysv/linux/epoll_pwait.c:40
#1  0x0000ffff9d4cd324 in epoll_dispatch () at ../../third_party/libevent/epoll.c:198
#2  0x0000ffff9d4caddc [PAC] in event_base_loop () at ../../third_party/libevent/event.c:512
#3  0x0000ffff9d3a2470 [PAC] in Run() () at ../../base/message_loop/message_pump_libevent.cc:356
#4  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#5  0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#6  0x0000ffff9d3754cc [PAC] in base::Thread::Run(base::RunLoop*) () at ../../base/threading/thread.cc:337
#7  0x0000ffff9d3650e8 [PAC] in base::internal::ServiceThread::Run(base::RunLoop*) () at ../../base/task/thread_pool/service_thread.cc:15
#8  0x0000ffff9d375654 [PAC] in ThreadMain() () at ../../base/threading/thread.cc:408
#9  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#10 0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#11 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 10 (Thread 0xffff82ef5980 (LWP 10196) "sandbox_ipc_thr"):
#0  0x0000ffff97adbc78 in __GI___poll (fds=0xffff82ef4ee0, nfds=2, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:41
#1  0x0000ffff9b8e5ab0 in Run() () at ../../content/browser/sandbox_ipc_linux.cc:46
#2  0x0000ffff9d39834c [PAC] in ThreadFunc() () at ../../base/threading/platform_thread_posix.cc:101
#3  0x0000ffff97a7d5c8 [PAC] in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#4  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 9 (Thread 0xffff90ede980 (LWP 10195) "CrBrowserMain"):
#0  0x0000ffff97adbc78 in __GI___poll (fds=0xffff70189930, nfds=3, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:41
#1  0x0000ffff97cdb738 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff97c82f14 in g_main_context_iteration () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#3  0x0000ffff9d30a824 in Run() () at ../../base/message_loop/message_pump_glib.cc:400
#4  0x0000ffff9d359354 [PAC] in Run() () at ../../base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:577
#5  0x0000ffff9d32a738 [PAC] in Run() () at ../../base/run_loop.cc:141
#6  0x0000ffff9a07cdd8 [PAC] in RunMessageLoop() () at ../../cef/libcef/browser/main_runner.cc:281
#7  0x0000ffff94d7e784 [PAC] in run_cef(_GstCefSrc*) () at /usr/cef/libgstcef.so
#8  0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#9  0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#10 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 8 (Thread 0xffff916ee980 (LWP 10194) "audio-queue:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff94aefb58 in gst_aggregator_pad_chain_internal (self=0xaaab02e9c1d0 [GstAggregator|mixer], aggpad=0xaaab02eca8b0 [GstAggregatorPad|sink_1], buffer=0xffff74012b40, head=1) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:3079
#3  0x0000ffff94af03c8 in gst_aggregator_pad_chain (pad=0xaaab02eca8b0 [GstPad|sink_1], object=0xaaab02e9c1d0 [GstObject|mixer], buffer=0xffff74012b40) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:3159
#4  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02eca8b0 [GstPad|sink_1], type=4112, data=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4447
#5  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02ea4d50 [GstPad|src], type=4112, data=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4711
#6  0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02ea4d50 [GstPad|src], buffer=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4830
#7  0x0000ffff94b332c0 in gst_base_transform_chain (pad=0xaaab02ea4b00 [GstPad|sink], parent=0xaaab02eb9e20 [GstObject|audioconvert1], buffer=0xffff74012b40) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2377
#8  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02ea4b00 [GstPad|sink], type=4112, data=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4447
#9  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e7e2c0 [GstPad|audio], type=4112, data=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4711
#10 0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e7e2c0 [GstPad|audio], buffer=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4830
#11 0x0000ffff97e10e2c in gst_proxy_pad_chain_default (pad=0xaaab02e80320 [GstPad|proxypad1], parent=0xaaab02e7e2c0 [GstObject|audio], buffer=0xffff74012b40) at ../subprojects/gstreamer/gst/gstghostpad.c:127
#12 0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02e80320 [GstPad|proxypad1], type=4112, data=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4447
#13 0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e870f0 [GstPad|src], type=4112, data=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4711
#14 0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e870f0 [GstPad|src], buffer=0xffff74012b40) at ../subprojects/gstreamer/gst/gstpad.c:4830
#15 0x0000ffff94939bfc in gst_queue_push_one (queue=0xaaab02e8e420 [GstQueue|audio-queue]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1388
#16 0x0000ffff9493a9d0 in gst_queue_loop (pad=0xaaab02e870f0 [GstPad|src]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1541
#17 0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed4710 [GstTask|audio-queue:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#18 0x0000ffff97e802bc in default_func (tdata=0xaaab02ea0e60, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#19 0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#20 0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#21 0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#22 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 7 (Thread 0xffff91efe980 (LWP 10193) "video-queue:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff9493a5a8 in gst_queue_loop (pad=0xaaab02e86c50 [GstPad|src]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1529
#3  0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed45f0 [GstTask|video-queue:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#4  0x0000ffff97e802bc in default_func (tdata=0xaaab02e83120, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#5  0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#6  0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#7  0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#8  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 6 (Thread 0xffff9270e980 (LWP 10192) "audiotestsrc0:s"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff94aefb58 in gst_aggregator_pad_chain_internal (self=0xaaab02e9c1d0 [GstAggregator|mixer], aggpad=0xaaab02ec5230 [GstAggregatorPad|sink_0], buffer=0xffff74013000, head=1) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:3079
#3  0x0000ffff94af03c8 in gst_aggregator_pad_chain (pad=0xaaab02ec5230 [GstPad|sink_0], object=0xaaab02e9c1d0 [GstObject|mixer], buffer=0xffff74013000) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:3159
#4  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02ec5230 [GstPad|sink_0], type=4112, data=0xffff74013000) at ../subprojects/gstreamer/gst/gstpad.c:4447
#5  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e87340 [GstPad|src], type=4112, data=0xffff74013000) at ../subprojects/gstreamer/gst/gstpad.c:4711
#6  0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e87340 [GstPad|src], buffer=0xffff74013000) at ../subprojects/gstreamer/gst/gstpad.c:4830
#7  0x0000ffff94b291d8 in gst_base_src_loop (pad=0xaaab02e87340 [GstPad|src]) at ../subprojects/gstreamer/libs/gst/base/gstbasesrc.c:3030
#8  0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed44d0 [GstTask|audiotestsrc0:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#9  0x0000ffff97e802bc in default_func (tdata=0xaaab02e83000, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#10 0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#11 0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#12 0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#13 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 5 (Thread 0xffff92f1e980 (LWP 10191) "mixer:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff9493935c in gst_queue_chain_buffer_or_list (pad=0xaaab02e87a30 [GstPad|sink], parent=0xaaab02e8e720 [GstObject|queue0], obj=0xffff0c0aec60, is_list=0) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1251
#3  0x0000ffff94939a80 in gst_queue_chain (pad=0xaaab02e87a30 [GstPad|sink], parent=0xaaab02e8e720 [GstObject|queue0], buffer=0xffff0c0aec60) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1349
#4  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02e87a30 [GstPad|sink], type=4112, data=0xffff0c0aec60) at ../subprojects/gstreamer/gst/gstpad.c:4447
#5  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e877e0 [GstPad|src], type=4112, data=0xffff0c0aec60) at ../subprojects/gstreamer/gst/gstpad.c:4711
#6  0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e877e0 [GstPad|src], buffer=0xffff0c0aec60) at ../subprojects/gstreamer/gst/gstpad.c:4830
#7  0x0000ffff94b332c0 in gst_base_transform_chain (pad=0xaaab02e87590 [GstPad|sink], parent=0xaaab02ea1960 [GstObject|audioconvert0], buffer=0xffff0c0aec60) at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2377
#8  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02e87590 [GstPad|sink], type=4112, data=0xffff0c0aec60) at ../subprojects/gstreamer/gst/gstpad.c:4447
#9  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e9e440 [GstPad|src], type=4112, data=0xffff0c0aec60) at ../subprojects/gstreamer/gst/gstpad.c:4711
#10 0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e9e440 [GstPad|src], buffer=0xffff0c0aec60) at ../subprojects/gstreamer/gst/gstpad.c:4830
#11 0x0000ffff94ae45c0 in gst_aggregator_default_finish_buffer (self=0xaaab02e9c1d0 [GstAggregator|mixer], buffer=0xffff0c0aec60) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:688
#12 0x0000ffff94ae46c0 in gst_aggregator_finish_buffer (aggregator=0xaaab02e9c1d0 [GstAggregator|mixer], buffer=0xffff0c0aec60) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:714
#13 0x0000ffff94bbe448 in gst_audio_aggregator_aggregate (agg=0xaaab02e9c1d0 [GstAggregator|mixer], timeout=0) at ../subprojects/gst-plugins-base/gst-libs/gst/audio/gstaudioaggregator.c:2549
#14 0x0000ffff94ae7ed8 in gst_aggregator_aggregate_func (self=0xaaab02e9c1d0 [GstAggregator|mixer]) at ../subprojects/gstreamer/libs/gst/base/gstaggregator.c:1389
#15 0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed43b0 [GstTask|mixer:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#16 0x0000ffff97e802bc in default_func (tdata=0xaaab02ea0a80, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#17 0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#18 0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#19 0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#20 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 4 (Thread 0xffff9372e980 (LWP 10190) "queue0:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff94b45934 in gst_collect_pads_chain (pad=0xaaab02ea58e0 [GstPad|audio_0], parent=0xaaab02eb2040 [GstObject|muxer], buffer=0xffff7800e6c0) at ../subprojects/gstreamer/libs/gst/base/gstcollectpads.c:2244
#3  0x0000ffff97e37f28 in gst_pad_chain_data_unchecked (pad=0xaaab02ea58e0 [GstPad|audio_0], type=4112, data=0xffff7800e6c0) at ../subprojects/gstreamer/gst/gstpad.c:4447
#4  0x0000ffff97e38d18 in gst_pad_push_data (pad=0xaaab02e87c80 [GstPad|src], type=4112, data=0xffff7800e6c0) at ../subprojects/gstreamer/gst/gstpad.c:4711
#5  0x0000ffff97e39480 in gst_pad_push (pad=0xaaab02e87c80 [GstPad|src], buffer=0xffff7800e6c0) at ../subprojects/gstreamer/gst/gstpad.c:4830
#6  0x0000ffff94939bfc in gst_queue_push_one (queue=0xaaab02e8e720 [GstQueue|queue0]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1388
#7  0x0000ffff9493a9d0 in gst_queue_loop (pad=0xaaab02e87c80 [GstPad|src]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1541
#8  0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed4170 [GstTask|queue0:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#9  0x0000ffff97e802bc in default_func (tdata=0xaaab02ea0e80, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#10 0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#11 0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#12 0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#13 0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 3 (Thread 0xffff93f3e980 (LWP 10189) "queue1:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff9493a5a8 in gst_queue_loop (pad=0xaaab02ea4660 [GstPad|src]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1529
#3  0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed4050 [GstTask|queue1:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#4  0x0000ffff97e802bc in default_func (tdata=0xaaab02ea0ab0, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#5  0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#6  0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#7  0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#8  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 2 (Thread 0xffff9474e980 (LWP 10188) "queue2:src"):
#0  syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1  0x0000ffff97cd571c in g_cond_wait () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff9493a5a8 in gst_queue_loop (pad=0xaaab02ea5690 [GstPad|src]) at ../subprojects/gstreamer/plugins/elements/gstqueue.c:1529
#3  0x0000ffff97e7ed5c in gst_task_func (task=0xaaab02ed4290 [GstTask|queue2:src]) at ../subprojects/gstreamer/gst/gsttask.c:384
#4  0x0000ffff97e802bc in default_func (tdata=0xaaab02ea0c60, pool=0xaaab02ed2490 [GstTaskPool|taskpool0]) at ../subprojects/gstreamer/gst/gsttaskpool.c:70
#5  0x0000ffff97cb8678 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#6  0x0000ffff97cb59a0 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#7  0x0000ffff97a7d5c8 in start_thread (arg=0x0) at ./nptl/pthread_create.c:442
#8  0x0000ffff97ae5d1c in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:79

Thread 1 (Thread 0xffff979fd040 (LWP 10187) "gst-launch-1.0"):
#0  0x0000ffff97adbc78 in __GI___poll (fds=0xaaab02ed7770, nfds=2, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:41
#1  0x0000ffff97cdb738 in  () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#2  0x0000ffff97c85024 in g_main_loop_run () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#3  0x0000aaaae831707c in main (argc=41, argv=0xffffcaa813f8) at ../subprojects/gstreamer/tools/gst-launch.c:1305
[Inferior 1 (process 10187) detached]

Can't reproduce the issue when GST_DEBUG=5 or higher, so can't provide detailed logs.

[pyldin601]

It is also reproducible when I run example pipeline from README.md - Record website video + audio (with audiomixer). Just need to run some CPU heavy task in the background to trigger lags. After some time of lagging, it hangs forever.

[MathieuDuponchelle]

Both pipelines work with no issue on my end (gst main). What version of GStreamer are you using? Have you tried removing either audio or video ?

[pyldin601]

GStreamer 1.20.2 (GIT)

It is reproducible when cefbin starts dropping audio or video data due to CPU overload.

I've tried to remove audio/video tracks from muxer and also tried to remove cef.audio pad from audiomixer leaving only silence. In both cases, the issue was not reproducible. The only thing, that helped to make my pipeline with audio and video not hanging on overload is to make the queue between cef.audio and audiomixer leaky.

[reinismu]

Just a guess, but did you monitor memory usage? Maybe the queue feels up and the operating system starts to swap memory?

[MathieuDuponchelle]

Why would cefbin drop data?

[pyldin601]

Just a guess, but did you monitor memory usage? Maybe the queue feels up and the operating system starts to swap memory?

Yes, I can confirm that this happens when I have high CPU/memory usage. This causes the cefbin to start lagging. But at some point of time the pipeline completely stuck and never continues to play the pipeline. Even if CPU starts idling.

Why would cefbin drop data?

Sorry, I meant it starts lagging. But after a few seconds of lagging, the pipeline completely hangs.

Just a guess, can the "lagging" of audio/video pads on cefbin causing some pts desync on both pads?

[hevc]

Hi,
I observe the same issue. When CPU usage is high then CEF starts producing bad audio PTS. Once the CPU usage stabilizes the audio never returns to normal. Record files then have erroneous audio. This manifests itself through very high crackling and distortion of the sound. The video looks fine. Recordings last ~1h or longer.

Moreover sometimes during low CPU usage I observe short audio crackles.

Maybe PTS calculation is wrong when gst buffer are created? Perhaps there is a PTS drift?

How to reproduce:

• Create Vbox with 2 cpu.
• build gst 1.21.2
• build cefsrc main
• start:
  GST_DEBUG=3 gst-launch-1.0 -e mpegtsmux name=mux ! filesink location=test.ts cefbin name=cef cefsrc::url="https://www.youtube.com/embed/lEk1riUEdCQ?playlist=lEk1riUEdCQ&autoplay=1&loop=1" cefsrc::gpu=false cef.video ! videoconvert ! video/x-raw,framerate=30/1,format=I420 ! queue ! x264enc tune=zerolatency speed-preset=ultrafast ! h264parse ! queue ! mux. cef.audio ! queue ! audioconvert ! audiomixer ! queue ! fdkaacenc ! aacparse ! queue ! mux.

after ~10 seconds it hangs.

With vbox 4 cpu pipeline works longer but the video is bad. CPU/ Mem:

Converted with ffmpeg -i test.ts -c copy out.mp4:

out.mp4

[philn]

In OnAudioStreamPacket() the pts from CEF is actually not used. We compute one based on the initial video framerate, incremented by audio packet duration afterwards. I wonder why?

[philn]

I experimented a bit in this branch, maybe some folks would like to give feedback! https://github.com/philn/gstcefsrc/tree/audio-things

[hevc]

I tested your branch. It brings a change from the previous behavior. Audio does not drift as before (however, it needs more testing). I have attached two files for comparison: "out_new.mp4" is with the latest changes. I tested on virtualbox with 2 cpu 2.5 GHz to show the problem faster.

With the new changes you can clearly hear crackling in the audio stream. Sometimes I also heard modulations of the sound.

out_new.mp4

out_old.mp4

[hevc]

Maybe I'm wrong, but it looks like the audio is synchronized to the video, and it should be the other way around. Maybe the audio PTS from CEF needs to be set as the video PTS.

[MathieuDuponchelle]

https://bitbucket.org/chromiumembedded/cef/issues/2995/audio-capture-susceptible-to-packet-loss#comment-59277083 sounds (hah) extremely related

[MathieuDuponchelle]

In OnAudioStreamPacket() the pts from CEF is actually not used. We compute one based on the initial video framerate, incremented by audio packet duration afterwards. I wonder why?

I don't remember to be honest, but design wise my approach was: attach whatever audio was produced since the last video frame was produced, and assume CEF provides us with live, synchronized audio and video data.

[hevc]

I think the changes made by @philn improve a lot. The most important improvement is that using audio PTS from CEF allows the audio to fix itself after a heavy CPU load. The previous implementation had no way to fix itself.

I suggest that these changes should be merged.

[MathieuDuponchelle]

I think the patch makes sense too, but I would like to test too if you don't mind, using virtualbox is a nice trick thanks @hevc :) @pldin601 can you please try Phil's patch on your end?

I've added this to my TODO list in any case :)