Bug 179755 – [GTK] media/video-empty-source.html is flaky

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Miguel Gomez]

media/video-empty-source.html [ Crash ]

It doesn't happen very often, but every now and then the test crashes. We get an X error

STDERR: (WebKitWebProcess:20070): Gdk-ERROR **: The program 'WebKitWebProcess' received an X Window System error.
STDERR: This probably reflects a bug in the program.
STDERR: The error was 'BadAccess (attempt to access private resource denied)'.
STDERR:   (Details: serial 1473 error_code 10 request_code 130 (MIT-SHM) minor_code 1)
STDERR:   (Note to programmers: normally, X errors are reported asynchronously;
STDERR:    that is, you will receive the error a while after causing it.
STDERR:    To debug your program, run it with the GDK_SYNCHRONIZE environment
STDERR:    variable to change this behavior. You can then get a meaningful
STDERR:    backtrace from your debugger if you break on the gdk_x_error() function.)

and the bt of the problematic thread

#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa48d828730 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#2  0x00007fa48d828bc9 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#3  0x00007fa48d830080 in XPutImage () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#4  0x00007fa48f8f85b9 in swrastPutImage2 () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/glx/drisw_glx.c:166
#5  0x00007fa48f8f85f3 in swrastPutImage () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/glx/drisw_glx.c:176
#6  0x00007fa413d25616 in put_image () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/gallium/state_trackers/dri/drisw.c:70
#7  drisw_put_image () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/gallium/state_trackers/dri/drisw.c:113
#8  0x00007fa413d25c8e in drisw_present_texture () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/gallium/state_trackers/dri/drisw.c:136
#9  drisw_copy_to_front () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/gallium/state_trackers/dri/drisw.c:153
#10 drisw_swap_buffers () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/gallium/state_trackers/dri/drisw.c:180
#11 0x00007fa48f8f80a5 in driswSwapBuffers () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/Mesa/src/glx/drisw_glx.c:552
#12 0x00007fa49327304b in _ZN6WebKit18ThreadedCompositor15renderLayerTreeEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#13 0x00007fa49326fad1 in _ZN6WebKit18CompositingRunLoop16updateTimerFiredEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#14 0x00007fa490df64fa in _ZZN3WTF7RunLoop9TimerBaseC4ERS0_ENUlPvE_4_FUNES3_ () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#15 0x00007fa48e2b45ca in g_main_dispatch () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:3212
#16 g_main_context_dispatch () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:3865
#17 0x00007fa48e2b4948 in g_main_context_iterate () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:3938
#18 0x00007fa48e2b4c62 in g_main_loop_run () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:4134
#19 0x00007fa490df68f0 in _ZN3WTF7RunLoop3runEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#20 0x00007fa490df5924 in _ZN3WTF8FunctionIFvvEE15CallableWrapperIZNS_9WorkQueue18platformInitializeEPKcNS4_4TypeENS4_3QOSEEUlvE_E4callEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#21 0x00007fa490dc2beb in _ZN3WTF6Thread10entryPointEPNS0_16NewThreadContextE () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#22 0x00007fa490df4b39 in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#23 0x00007fa48aecd494 in start_thread (arg=0x7fa4055b8700) at pthread_create.c:333
#24 0x00007fa489d3293f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

[Diego Pino]

The test(s) filed under this bug have been consistently passing for the last 4000 revisions. Marking bug as fixed.

Committed r263254: <https://trac.webkit.org/changeset/263254>