ports/188133: www/firefox coredumps when rewinding HTML5 video content provided by multimedia/gstreamer1-libav

[Jakub Lach]

>Number:         188133
>Category:       ports
>Synopsis:       www/firefox coredumps when rewinding HTML5 video content provided by multimedia/gstreamer1-libav
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 31 15:20:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Jakub Lach
>Release:        FreeBSD 10.0-STABLE #0 r263890 amd64
>Organization:
>Environment:
FreeBSD 10.0-STABLE #0 r263890 amd64 (CPU is a Penryn, -march=native, clang 3.4)
>Description:
When rewinding video content provided by gstreamer1-libav (usually h264, I'm stressing this because till recent update libav was miscompiled and wasn't loaded when starting www/firefox at all, and I don't think this problem manifested itself) www/firefox core dumps.

The farthest I've got, thanks to recent correction enabling me to build www/firefox with debug support-

Core was generated by `firefox'.
Program terminated with signal 11, Segmentation fault.
#0  0x00000008011e5e9a in thr_kill () from /lib/libc.so.7
(gdb) bt
#0  0x00000008011e5e9a in thr_kill () from /lib/libc.so.7
#1  0x000000080594803b in nsProfileLock::FatalSignalHandler (signo=11,
    info=0x7ffffd4c7330, context=0x7ffffd4c6fc0)
    at /usr/obj/usr/ports/www/firefox/work/mozilla-release/profile/dirserviceprovider/s
#2  0x000000080619a24f in AsmJSFaultHandler (signum=11, info=0x7ffffd4c7330,
    context=0x7ffffd4c6fc0)
    at ../../../js/src/jit/AsmJSSignalHandlers.cpp:931
#3  0x0000000800f62586 in ?? () from /lib/libthr.so.3
#4  0x0000000800f6212f in ?? () from /lib/libthr.so.3
#5  0x00007ffffffff003 in ?? ()
#6  0x0000000800f61ff0 in ?? () from /lib/libthr.so.3
#7  0x0000000000000000 in ?? ()

I know it's not much.
>How-To-Repeat:
Rewind/Skip to a point in multiple videos and try your luck.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: