[Webkit-unassigned] [Bug 249690] New: [GTK] UI process hang when fullscreening video on reddit.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249690

            Bug ID: 249690
           Summary: [GTK] UI process hang when fullscreening video on
                    reddit.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at gnome.org
                CC: bugs-noreply at webkitgtk.org

With WebKitGTK 2.39.3 (tested both Tech Preview and my personal jhbuild), the UI process hangs when attempting to fullscreen a video on reddit.com. There is an associated web process crash, bug #249689, but problem is the web process is untrusted and should not be allowed to hang the UI process no matter what, so this is a separate bug from the underlying web process crash.

At the time of the hang, the UI process is just calmly handling Wayland events as if nothing is wrong:

(gdb) bt
#0  __futex_abstimed_wait_common64
    (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x5595c8b15190) at futex-internal.c:57
#1  __futex_abstimed_wait_common
    (futex_word=futex_word at entry=0x5595c8b15190, expected=expected at entry=0, clockid=clockid at entry=0, abstime=abstime at entry=0x0, private=private at entry=0, cancel=cancel at entry=true) at futex-internal.c:87
#2  0x00007f6e0cc8bc1f in __GI___futex_abstimed_wait_cancelable64
    (futex_word=futex_word at entry=0x5595c8b15190, expected=expected at entry=0, clockid=clockid at entry=0, abstime=abstime at entry=0x0, private=private at entry=0) at futex-internal.c:139
#3  0x00007f6e0cc8e4d1 in __pthread_cond_wait_common
    (abstime=0x0, clockid=0, mutex=<optimized out>, cond=0x5595c8b15168) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x5595c8b15168, mutex=<optimized out>) at pthread_cond_wait.c:618
#5  0x00007f6e0608ebd5 in read_events () at /usr/lib/x86_64-linux-gnu/libwayland-client.so.0
#6  0x00007f6e0608ecb3 in wl_display_read_events () at /usr/lib/x86_64-linux-gnu/libwayland-client.so.0
#7  0x00007f6e0608efc6 in wl_display_dispatch_queue () at /usr/lib/x86_64-linux-gnu/libwayland-client.so.0
#8  0x00007f6e0d46be7f in gdk_wayland_toplevel_focus (toplevel=0x5595cb1d1fb0, timestamp=<optimized out>)
    at ../gdk/wayland/gdksurface-wayland.c:3603
#9  0x00007f6e0dd730a3 in  () at /app/lib/epiphany/libephymain.so
#10 0x00007f6e0db066df in g_timeout_dispatch
    (source=0x5595cb21adf0, callback=<optimized out>, user_data=<optimized out>) at ../glib/gmain.c:5007
#11 0x00007f6e0db059e1 in g_main_dispatch (context=<optimized out>) at ../glib/gmain.c:3444
#12 g_main_context_dispatch (context=<optimized out>) at ../glib/gmain.c:4162
#13 0x00007f6e0db05f38 in g_main_context_iterate
    (context=context at entry=0x5595c8ac87c0, block=block at entry=1, dispatch=dispatch at entry=1, self=<optimized out>)
    at ../glib/gmain.c:4238
#14 0x00007f6e0db05fd3 in g_main_context_iteration
    (context=context at entry=0x5595c8ac87c0, may_block=may_block at entry=1) at ../glib/gmain.c:4303
#15 0x00007f6e0d9ad84d in g_application_run
    (application=0x5595c8afbff0 [EphyShell], argc=<optimized out>, argv=<optimized out>)
    at ../gio/gapplication.c:2573
#16 0x00005595c860d04b in main ()

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