[Webkit-unassigned] [Bug 232492] New: [ BigSur Debug wk2 arm64 EWS ] webrtc/video-receivers.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232492

            Bug ID: 232492
           Summary: [ BigSur Debug wk2 arm64 EWS ]
                    webrtc/video-receivers.html is a flaky crash
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ehutchison at apple.com
                CC: youennf at gmail.com

Created attachment 442831

  --> https://bugs.webkit.org/attachment.cgi?id=442831&action=review

Crash Log

webrtc/video-receivers.html

is a flaky crash on BigSur Debug wk2 arm64 EWS-only.

History: https://results.webkit.org/?suite=layout-tests&test=webrtc/video-receivers.html

Build: https://ews-build.webkit.org/#/builders/60/builds/15664

Results: https://ews-build.s3-us-west-2.amazonaws.com/macOS-AppleSilicon-Big-Sur-Debug-WK2-Tests-EWS/r442804-15664/results.html

Crash Log (attached): https://ews-build.s3-us-west-2.amazonaws.com/macOS-AppleSilicon-Big-Sur-Debug-WK2-Tests-EWS/r442268-15245/com.apple.WebKit.GPU.Development-32322-crash-log.txt

Thread 52 Crashed:: Dispatch queue: vtencoder-callback-queue-0x2e0124c40
0   libsystem_pthread.dylib             0x00000001987e1d9c pthread_mutex_lock + 0
1   com.apple.VideoToolbox              0x00000001a3830858 VTEncoderSessionEmitEncodedFrame + 404
2   com.apple.VideoToolbox              0x00000001a38debb4 0x1a381d000 + 793524
3   libxpc.dylib                        0x00000001985517d0 _xpc_connection_call_event_handler + 172
4   libxpc.dylib                        0x000000019855032c _xpc_connection_mach_event + 968
5   libdispatch.dylib                   0x0000000198637f8c _dispatch_client_callout4 + 20
6   libdispatch.dylib                   0x0000000198653114 _dispatch_mach_msg_invoke + 476
7   libdispatch.dylib                   0x000000019863f570 _dispatch_lane_serial_drain + 308
8   libdispatch.dylib                   0x0000000198653e78 _dispatch_mach_invoke + 464
9   libdispatch.dylib                   0x000000019863f570 _dispatch_lane_serial_drain + 308
10  libdispatch.dylib                   0x00000001986402d8 _dispatch_lane_invoke + 456
11  libdispatch.dylib                   0x0000000198649684 _dispatch_root_queue_drain + 388
12  libdispatch.dylib                   0x000000019864941c _dispatch_worker_thread + 236
13  libsystem_pthread.dylib             0x00000001987e7878 _pthread_start + 320
14  libsystem_pthread.dylib             0x00000001987e25e0 thread_start + 8

As noted above, this test crash has not been seen on OpenSource.

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