Hang on disconnecting RTSP clients on Gstreamer 1.18.0 (using test-video-disconnect example)

[Lawrence Troup]

I'm trying to upgrade from Gstreamer 1.14.4 to 1.18.0. After this upgrade, I
see a hang when running the test-video-disconnect example, in the call to
gst_rtsp_client_close. The full GDB stacktrace is pasted below. It does not
occur on every run, but is hit most times.

With 1.14.4, this issue was not seen - test-video-disconnect ran fine,
disconnecting the client successfully and exiting cleanly.

Is this a known issue in 1.18?

Thread 1 "test-video-disc" received signal SIGINT, Interrupt.
0x0000007ff7207270 in syscall () from /lib/libc.so.6
(gdb) bt
#0  0x0000007ff7207270 in syscall () from /lib/libc.so.6
#1  0x0000007ff75de3f0 in g_mutex_lock_slowpath (mutex=0x57bd60)
    at ../glib/gthread-posix.c:1458
#2  0x0000007ff757f82c in g_source_unref_internal.lto_priv.63 (
    source=0x57bf60, context=0x57bd60, have_lock=0) at ../glib/gmain.c:2237
#3  0x0000007ff7c1503c in gst_rtsp_source_finalize (source=0x57d150)
    at ../gst-libs/gst/rtsp/gstrtspconnection.c:4152
#4  0x0000007ff757f824 in g_source_unref_internal.lto_priv.63 (
    source=0x57d150, context=0x57bd60, have_lock=0) at ../glib/gmain.c:2235
#5  0x0000007ff7f6e984 in gst_rtsp_client_close (client=0x57c190)
    at ../gst/rtsp-server/rtsp-client.c:1307
#6  0x0000007ff7f88120 in gst_rtsp_server_client_filter (
    server=server at entry=0x514910, func=func at entry=0x400f24 <client_filter>, 
    user_data=0x422424b5b4a79e00, user_data at entry=0x0)
    at ../gst/rtsp-server/rtsp-server.c:1499
#7  0x0000000000401014 in shutdown_timeout (server=0x514910, 
    server at entry=<error reading variable: value has been optimized out>)
    at test-video-disconnect.c:75
#8  0x0000007ff757da20 in g_timeout_dispatch (source=<optimized out>, 
    callback=<optimized out>, user_data=<optimized out>)
    at ../glib/gmain.c:4800
#9  0x0000007ff758016c in g_main_dispatch (context=0x56d3b0)
--Type <RET> for more, q to quit, c to continue without paging--
    at ../glib/gmain.c:3309
#10 g_main_context_dispatch (context=context at entry=0x56d3b0)
    at ../glib/gmain.c:3974
#11 0x0000007ff7582d40 in g_main_context_iterate.isra.38 (context=0x56d3b0, 
    block=block at entry=1, dispatch=dispatch at entry=1) at ../glib/gmain.c:4047
#12 0x0000007ff7584570 in g_main_loop_run (loop=loop at entry=0x431c10)
    at ../glib/gmain.c:4241
#13 0x00000000004010f4 in main (argc=<optimized out>, argv=<optimized out>)
    at test-video-disconnect.c:211

Thanks,
Lawrence




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