[Webkit-unassigned] [Bug 199217] New: can consistently hang webkit displaying page with embedded video [not playing]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199217

            Bug ID: 199217
           Summary: can consistently hang webkit displaying page with
                    embedded video [not playing]
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: richcoe2 at gmail.com

Created attachment 372891

  --> https://bugs.webkit.org/attachment.cgi?id=372891&action=review

thread info and thread traceback

I'm using liferea which uses webkit to display web content.
For several weeks I've noticed the stability of webkit has declined. 
It frequently locks up and I have to restart the webkit web process.

I've started attaching gdb to it instead of killing it and I found the main thread blocked in 
gst_adaptive_demux_change_state() blocking on a mutex.
The other thread is source:src and it is in timedWait() from libjavascriptcoregkt.

There seems to be several different instances where it hangs in a deadlock between two threads.

This url is example: https://twitter.com/TIME/status/1142178303656288256/video/1

I've attached the traceback and thread info for loading the url.

I can reproduce it easily.

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