Tvheadend

Tvheadend crashed a few seconds after its start, more specifically during the IPTV scan that is done when the service starts up.
I filtered out the original .m3u list, making several tests until I eliminated non-issued entries. Final tests indicated that the crash occurs only when the list contains a set of URLs - notice they were the only URLs for mp4 files in the original list. Although the list with all of those issued URLs makes Tvheadend to crash, the same does not occur when the list is narrowed down to one or two of them.

Because the crash dump mentions pthread_create.c and http.c, I wonder that, possibly, multithreaded http requests targeting .mp4 files can cause this fault.

Original M3U list

see attached file "original_list.m3u" 

Filtered list with issued URLs

see attached file "filtered_list_with_issued_URLs.m3u" 

Last lines of Tvheadend debug log

2017-06-30 22:31:38.209 [  DEBUG] mpegts: tvfoco.m3u - DanceTV in TV Foco Local - stopping mux
2017-06-30 22:31:38.209 [  DEBUG] mpegts: removing mux tvfoco.m3u - DanceTV in TV Foco Local from scan queue
2017-06-30 22:31:38.209 [  DEBUG] service: tvfoco.m3u - Anime TV - Espanhol in TV Foco Local: Status changed to [CA check] [Graceperiod expired] [Data timeout] 
2017-06-30 22:31:38.209 [   INFO] mpegts: tvfoco.m3u - Anime TV - Espanhol in TV Foco Local - scan no data, failed
2017-06-30 22:31:38.209 [   INFO] subscription: 0008: "scan" unsubscribing
2017-06-30 22:31:38.209 [  DEBUG] mpegts: tvfoco.m3u - Anime TV - Espanhol in TV Foco Local - close PID tables subscription [0042/0x73d68578]
2017-06-30 22:31:38.209 [  DEBUG] mpegts: tvfoco.m3u - Anime TV - Espanhol in TV Foco Local - stopping mux
2017-06-30 22:31:38.209 [  DEBUG] mpegts: removing mux tvfoco.m3u - Anime TV - Espanhol in TV Foco Local from scan queue
2017-06-30 22:31:38.209 [  DEBUG] service: tvfoco.m3u - TV Pantanal in TV Foco Local: Status changed to [CA check] [Graceperiod expired] [Data timeout] 
2017-06-30 22:31:38.209 [   INFO] mpegts: tvfoco.m3u - TV Pantanal in TV Foco Local - scan no data, failed
2017-06-30 22:31:38.209 [   INFO] subscription: 0007: "scan" unsubscribing
2017-06-30 22:31:38.209 [  DEBUG] mpegts: tvfoco.m3u - TV Pantanal in TV Foco Local - close PID tables subscription [0042/0x73d59aa8]
2017-06-30 22:31:38.209 [  DEBUG] mpegts: tvfoco.m3u - TV Pantanal in TV Foco Local - stopping mux
2017-06-30 22:31:38.210 [  DEBUG] mpegts: removing mux tvfoco.m3u - TV Pantanal in TV Foco Local from scan queue
2017-06-30 22:31:38.210 [  DEBUG] service: tvfoco.m3u - Rede Meio Norte in TV Foco Local: Status changed to [CA check] [Graceperiod expired] [Data timeout] 
2017-06-30 22:31:38.210 [   INFO] mpegts: tvfoco.m3u - Rede Meio Norte in TV Foco Local - scan no data, failed
2017-06-30 22:31:38.210 [   INFO] subscription: 0006: "scan" unsubscribing
2017-06-30 22:31:38.210 [  DEBUG] mpegts: tvfoco.m3u - Rede Meio Norte in TV Foco Local - close PID tables subscription [0042/0x73d4b040]
2017-06-30 22:31:38.210 [  DEBUG] mpegts: tvfoco.m3u - Rede Meio Norte in TV Foco Local - stopping mux
Segmentation fault

Core Dump results & Full Backtrace

pi@RaspberryPi2:~/tvheadend $ gdb ./build.linux/tvheadend core 
GNU gdb (Raspbian 7.7.1+dfsg-5+rpi1) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
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and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabihf".
Type "show configuration" for configuration details.
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Reading symbols from ./build.linux/tvheadend...done.
[New LWP 16406]
[New LWP 16410]
[New LWP 16413]
[New LWP 16397]
[New LWP 16400]
[New LWP 16412]
[New LWP 16399]
[New LWP 16426]
[New LWP 16432]
[New LWP 16401]
[New LWP 16434]
[New LWP 16428]
[New LWP 16425]
[New LWP 16404]
[New LWP 16427]
[New LWP 16435]
[New LWP 16403]
[New LWP 16398]
[New LWP 16407]
[New LWP 16405]
[New LWP 16409]
[New LWP 16408]
[New LWP 16431]
[New LWP 16414]
[New LWP 16411]
[New LWP 16433]
[New LWP 16436]
[New LWP 16430]
[New LWP 16402]
[New LWP 16429]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
Core was generated by `./build.linux/tvheadend -c ./build.linux/test-conf -d'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  http_client_thread (p=<optimized out>) at src/httpc.c:1426
1426          TAILQ_FOREACH(hc, &http_clients, hc_link)
(gdb) set logging on
Copying output to gdb.txt.
(gdb) set pagination off
(gdb) bt full
#0  http_client_thread (p=<optimized out>) at src/httpc.c:1426
        n = <optimized out>
        ev = {fd = 0, events = 1, data = {ptr = 0x706f5178, u64 = 1886343544, u32 = 1886343544, fd = 1886343544}}
        hc = 0x66206c61
        c = 0 '\000'
#1  0x54ba65cc in thread_wrapper (p=0x572c30e0) at src/wrappers.c:161
        ts = 0x572c30e0
        set = {__val = {16388, 0 <repeats 31 times>}}
        r = <optimized out>
#2  0x76b85e90 in start_thread (arg=0x74eff170) at pthread_create.c:311
        pd = 0x74eff170
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {1961882072, 0, 2126147068, 338, 1431129272, 1989842112, 0, 1961880748, 1079413048, 1107377192, 0 <repeats 54 times>}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread" 
#3  0x76a7c598 in ?? () at ../ports/sysdeps/unix/sysv/linux/arm/nptl/../clone.S:92 from /lib/arm-linux-gnueabihf/libc.so.6
No locals.
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)