[Spice-devel] video playback issue with VP8/H264 patch

[Sunny Shin]

Hello Francois Gouget,

While applying and testing your patches supporting VP8 and H264, I had an
issue that VM gets hung when playing video. From gstack, it seems stuck in
gstreamer. Please check the details below, and let me know what might be
wrong. Thank you.


- OS: CentOS 7
- Patches from git server
    https://github.com/fgouget/spice/tree/gst
    https://github.com/fgouget/spice-gtk/tree/gst
    https://github.com/fgouget/spice-common/tree/gst
    https://github.com/fgouget/spice-protocol/tree/gst
- hardcoding to change the codec from mjpeg to vp8 or h264
    spice-gst/server/red_worker.c
        dcc_create_video_encoder()
            << return mjpeg_encoder_new(SPICE_VIDEO_CODEC_TYPE_MJPEG, ...)
            >> return gstreamer_encoder_new(SPICE_VIDEO_CODEC_TYPE_H264,
...)
- whenever trying to play a video, remote viewer doesn't respond, and VM
gets hung. Below is the gstack output of qemu-kvm process which was
captured after I'd closed remote viewer.

Thread 19 (Thread 0x7f0311065700 (LWP 15778)):
#0  0x00007f0320083f7d in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00007f032007fd32 in _L_lock_791 () from /lib64/libpthread.so.0
#2  0x00007f032007fc38 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00007f0322b3a3a9 in qemu_mutex_lock ()
#4  0x00007f0322a82634 in kvm_cpu_exec ()
#5  0x00007f0322a356f5 in qemu_kvm_cpu_thread_fn ()
#6  0x00007f032007ddf5 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f031c0e91ad in clone () from /lib64/libc.so.6
Thread 18 (Thread 0x7f030bfff700 (LWP 15793)):
#0  0x00007f0320081705 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f0321320c57 in g_cond_wait () from /lib64/libglib-2.0.so.0
#2  0x00007f0316e7b8b7 in gst_app_sink_pull_sample (appsink=0x7f02b838cbc0)
at gstappsink.c:1219
#3  0x00007f031ce0347d in pull_compressed_buffer () from
/lib64/libspice-server.so.1
#4  0x00007f031ce03944 in spice_gst_encoder_encode_frame () from
/lib64/libspice-server.so.1
#5  0x00007f031cdca828 in red_marshall_stream_data () from
/lib64/libspice-server.so.1
#6  0x00007f031cdcab8b in marshall_qxl_drawable () from
/lib64/libspice-server.so.1
#7  0x00007f031cdcc442 in display_channel_send_item () from
/lib64/libspice-server.so.1
#8  0x00007f031cd9f7e6 in red_channel_client_send_item () from
/lib64/libspice-server.so.1
#9  0x00007f031cda1f69 in red_channel_client_push () from
/lib64/libspice-server.so.1
#10 0x00007f031cda201e in red_channel_push () from
/lib64/libspice-server.so.1
#11 0x00007f031cdcc6ff in red_push () from /lib64/libspice-server.so.1
#12 0x00007f031cdd3ed9 in red_worker_main () from
/lib64/libspice-server.so.1
#13 0x00007f032007ddf5 in start_thread () from /lib64/libpthread.so.0
#14 0x00007f031c0e91ad in clone () from /lib64/libc.so.6
Thread 17 (Thread 0x7f030923b700 (LWP 15899)):
#0  0x00007f0320081705 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f0321320c57 in g_cond_wait () from /lib64/libglib-2.0.so.0
#2  0x00007f0316e77f6d in gst_app_src_create (bsrc=0x7f02b829f900,
offset=<optimized out>, size=4096, buf=0x7f030923a9a0) at gstappsrc.c:1197
#3  0x00007f0316c432f5 in gst_base_src_get_range (src=src at entry=0x7f02b829f900,
offset=offset at entry=641048, length=length at entry=4096,
buf=buf at entry=0x7f030923aaa8)
at gstbasesrc.c:2455
#4  0x00007f0316c44e43 in gst_base_src_loop (pad=0x7f02b838a060) at
gstbasesrc.c:2731
#5  0x00007f0316997081 in gst_task_func (task=0x7f02b8395050) at
gsttask.c:331
#6  0x00007f032130403c in g_thread_pool_thread_proxy () from
/lib64/libglib-2.0.so.0
#7  0x00007f03213036b5 in g_thread_proxy () from /lib64/libglib-2.0.so.0
#8  0x00007f032007ddf5 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f031c0e91ad in clone () from /lib64/libc.so.6
Thread 16 (Thread 0x7f0308a3a700 (LWP 15900)):
#0  0x00007f0320081705 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f03099154db in x264_threadpool_thread () from
/usr/local/lib/gstreamer-1.0/libgstx264.so
#2  0x00007f032007ddf5 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f031c0e91ad in clone () from /lib64/libc.so.6
... ...
Thread 3 (Thread 0x7f02ad7fa700 (LWP 15913)):
#0  0x00007f0320081705 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f03099154db in x264_threadpool_thread () from
/usr/local/lib/gstreamer-1.0/libgstx264.so
#2  0x00007f032007ddf5 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f031c0e91ad in clone () from /lib64/libc.so.6
Thread 2 (Thread 0x7f02a9c32700 (LWP 15914)):
#0  0x00007f0320081705 in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1  0x00007f0309914bd5 in x264_lookahead_thread () from
/usr/local/lib/gstreamer-1.0/libgstx264.so
#2  0x00007f032007ddf5 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f031c0e91ad in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7f032282fa40 (LWP 15767)):
#0  0x00007f032008425d in read () from /lib64/libpthread.so.0
#1  0x00007f031cda597a in read_safe () from /lib64/libspice-server.so.1
#2  0x00007f031cda5f0e in dispatcher_send_message () from
/lib64/libspice-server.so.1
#3  0x00007f031cda6d5f in red_dispatcher_disconnect_cursor_peer () from
/lib64/libspice-server.so.1
#4  0x00007f031cda4b9d in red_client_destroy () from
/lib64/libspice-server.so.1
#5  0x00007f031cdd8972 in reds_client_disconnect () from
/lib64/libspice-server.so.1
#6  0x00007f031cda9aba in main_dispatcher_handle_client_disconnect () from
/lib64/libspice-server.so.1
#7  0x00007f031cda5c68 in dispatcher_handle_single_read () from
/lib64/libspice-server.so.1
#8  0x00007f031cda5d67 in dispatcher_handle_recv_read () from
/lib64/libspice-server.so.1
#9  0x00007f031cda9cdc in dispatcher_handle_read () from
/lib64/libspice-server.so.1
#10 0x00007f03229c4206 in qemu_iohandler_poll ()
#11 0x00007f03229c8768 in main_loop_wait ()
#12 0x00007f03228ec340 in main ()
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