gdb) bt
#0  0x00007ffff6267729 in __libc_writev (fd=40, vector=0x7fffd0ff7d40, count=46) at ../sysdeps/unix/sysv/linux/writev.c:56
#1  0x0000000000442c16 in mk_write_to_fd (mkm=0x7fffb000b7b0, hq=<optimized out>) at /home/john/projects/tvheadend/src/muxer/tvh/mkmux.c:358
#2  0x0000000000442c9d in mk_write_queue (mkm=0x7fffb000b7b0, q=0x7fffd0ff8090) at /home/john/projects/tvheadend/src/muxer/tvh/mkmux.c:377
#3  0x0000000000442d14 in mk_write_master (mkm=0x7fffb000b7b0, id=524531317, p=0x7fffb0007de0) at /home/john/projects/tvheadend/src/muxer/tvh/mkmux.c:394
#4  0x0000000000442d47 in mk_close_cluster (mkm=0x7fffb000b7b0) at /home/john/projects/tvheadend/src/muxer/tvh/mkmux.c:788
#5  0x0000000000443f09 in mk_write_frame_i (pkt=0x7fffb00092e0, t=0x7fffb0000c20, mkm=0x7fffb000b7b0) at /home/john/projects/tvheadend/src/muxer/tvh/mkmux.c:841
#6  mk_mux_write_pkt (mkm=0x7fffb000b7b0, pkt=0x7fffb00092e0) at /home/john/projects/tvheadend/src/muxer/tvh/mkmux.c:1058
#7  0x00000000004420d4 in tvh_muxer_write_pkt (m=0x7fffb000b740, smt=<optimized out>, data=<optimized out>) at /home/john/projects/tvheadend/src/muxer/muxer_tvh.c:161
#8  0x00000000004395fe in http_stream_run (hc=0x7fffd0ff8d30, sq=0x7fffd0ff8260, name=0x7fffd0ff8210 "TV4", mc=<optimized out>)
    at /home/john/projects/tvheadend/src/webui/webui.c:212
#9  0x00000000004398c7 in http_stream_channel (hc=0x7fffd0ff8d30, ch=0x6baf50) at /home/john/projects/tvheadend/src/webui/webui.c:690
#10 0x0000000000439d18 in http_stream (hc=0x7fffd0ff8d30, remain=<optimized out>, opaque=<optimized out>) at /home/john/projects/tvheadend/src/webui/webui.c:751
#11 0x00000000004098ad in http_exec (hc=0x7fffd0ff8d30, hp=0x780020, remain=0x7fffd0ff893c "channel") at /home/john/projects/tvheadend/src/http.c:343
#12 0x0000000000409ce3 in http_cmd_get (hc=0x7fffd0ff8d30) at /home/john/projects/tvheadend/src/http.c:374
#13 0x0000000000409e7a in http_process_request (spill=0x7fffd0ff8e10, hc=0x7fffd0ff8d30) at /home/john/projects/tvheadend/src/http.c:454
#14 process_request (hc=0x7fffd0ff8d30, spill=0x7fffd0ff8e10) at /home/john/projects/tvheadend/src/http.c:520
#15 0x000000000040a23b in http_serve_requests (spill=0x7fffd0ff8e10, hc=0x7fffd0ff8d30) at /home/john/projects/tvheadend/src/http.c:754
#16 http_serve (fd=40, opaque=<optimized out>, peer=<optimized out>, self=<optimized out>) at /home/john/projects/tvheadend/src/http.c:797
#17 0x00000000004086b7 in tcp_server_start (aux=0x7fffec004990) at /home/john/projects/tvheadend/src/tcp.c:402
#18 0x00007ffff682cda6 in start_thread (arg=0x7fffd0ff9700) at pthread_create.c:305
#19 0x00007ffff626e99d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115