[Webkit-unassigned] [Bug 177409] New: [GStreamer][MSE] gstreamer critical warning in gst_buffer_pool_acquire_buffer()

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Sep 23 11:29:43 PDT 2017 

https://bugs.webkit.org/show_bug.cgi?id=177409

            Bug ID: 177409
           Summary: [GStreamer][MSE] gstreamer critical warning in
                    gst_buffer_pool_acquire_buffer()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

How to reproduce:

1. Merge the webm patch https://bugs.webkit.org/show_bug.cgi?id=177355
2. Load the following page: http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/2018.html?tests=56&command=run

After the test completes (passing), a GStreamer warning is printed.

http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  Media Source and Encrypted Media Conformance Tests (version 20170922171024-vKiynwyVqklah7cE) 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  Test 56:AppendVP9Video STARTED with timeout 30000 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  checkEq passed: Source buffer number is (1). 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  checkEq passed: Range start is (0). 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  checkApproxEq passed: Range end is (0.999777). 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  Test 56:AppendVP9Video PASSED. 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  New longest test AppendVP9Video with timeout 30000 takes 1239 

(WebKitWebProcess:23826): GStreamer-CRITICAL **: gst_buffer_pool_acquire_buffer: assertion 'GST_IS_BUFFER_POOL (pool)' failed
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  Longest test is AppendVP9Video, it takes 0.0413 of its timeout. 
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/js/harness/main-20170922171024.js:123:16: CONSOLE LOG TestExecutor:  All tests are completed 

This is the backtrace, captured by setting a breakpoint in `g_log()`:

#0  g_log () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmessages.c:1394
#1  0x00007fffe27e3c5f in gst_buffer_pool_acquire_buffer () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstbufferpool.c:1251
#2  0x00007fffe1e9649b in gst_video_decoder_allocate_output_frame () at /webkit/WebKitBuild/DependenciesGTK/Source/gst-plugins-base-1.10.5/gst-libs/gst/video/gstvideodecoder.c:3987
#3  0x00007fff4ccf262f in gst_vpx_dec_handle_frame () at /webkit/WebKitBuild/DependenciesGTK/Source/gst-plugins-good-1.10.5/ext/vpx/gstvpxdec.c:712
#4  0x00007fffe1e8be6e in gst_video_decoder_decode_frame () at /webkit/WebKitBuild/DependenciesGTK/Source/gst-plugins-base-1.10.5/gst-libs/gst/video/gstvideodecoder.c:3389
#5  0x00007fffe1e8e7d8 in gst_video_decoder_chain_forward () at /webkit/WebKitBuild/DependenciesGTK/Source/gst-plugins-base-1.10.5/gst-libs/gst/video/gstvideodecoder.c:2131
#6  0x00007fffe1e8ee53 in gst_video_decoder_chain () at /webkit/WebKitBuild/DependenciesGTK/Source/gst-plugins-base-1.10.5/gst-libs/gst/video/gstvideodecoder.c:2443
#7  0x00007fffe2814567 in gst_pad_chain_data_unchecked () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4202
#8  gst_pad_push_data () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4454
#9  0x00007fffe281c483 in gst_pad_push () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4573
#10 0x00007fffe2814567 in gst_pad_chain_data_unchecked () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4202
#11 gst_pad_push_data () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4454
#12 0x00007fffe281c483 in gst_pad_push () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4573
#13 0x00007fffe28043eb in gst_proxy_pad_chain_default () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstghostpad.c:126
#14 0x00007fffe2814567 in gst_pad_chain_data_unchecked () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4202
#15 gst_pad_push_data () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4454
#16 0x00007fffe281c483 in gst_pad_push () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4573
#17 0x00007fffe28043eb in gst_proxy_pad_chain_default () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstghostpad.c:126
#18 0x00007fffe2814567 in gst_pad_chain_data_unchecked () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4202
#19 gst_pad_push_data () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4454
#20 0x00007fffe281c483 in gst_pad_push () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gstpad.c:4573
#21 0x00007fffe2b04775 in gst_base_src_loop () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/libs/gst/base/gstbasesrc.c:2854
#22 0x00007fffe2847249 in gst_task_func () at /webkit/WebKitBuild/DependenciesGTK/Source/gstreamer-1.10.5/gst/gsttask.c:334
#23 0x00007fffe03fe100 in g_thread_pool_thread_proxy () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gthreadpool.c:307
#24 0x00007fffe03fd775 in g_thread_proxy () at /webkit/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gthread.c:784
#25 0x00007fffdca2836d in start_thread (arg=0x7fff4d6ff700) at pthread_create.c:456
#26 0x00007fffdb670bbf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

`pool` variable is null, but it's not clear where it got that value from.

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