Tvheadend

I am using latest 79c1b4904be7ceac4c10a92f6145b1cf18e7e967.
When switching channels, system crashes at iptv_input.c:

Jun  7 21:55:29 fsiptv tvheadend[21838]: subscription: "172.30.108.119 [ XBMC Media Center ]" unsubscribing from "CNBC Europe" 
Jun  7 21:55:29 fsiptv tvheadend[21838]: subscription: "172.30.108.119 [ XBMC Media Center ]" subscribing on "RTL Nitro", weight: 150, adapter: "eth0", network: "<N/A>", mux: "224.0.9.7", provider: "<N/A>", service: "<N/A>", quality: 100
Jun  7 21:55:29 fsiptv tvheadend[21838]: Service: eth0/224.0.9.7: Status changed to [Hardware input] 
Jun  7 21:55:29 fsiptv tvheadend[21838]: Service: eth0/224.0.9.7: Status changed to [Hardware input] [Input on service] 
Jun  7 21:55:29 fsiptv tvheadend[21838]: Service: eth0/224.0.9.7: Status changed to [Hardware input] [Input on service] [Demuxed packets] 
Jun  7 21:55:29 fsiptv tvheadend[21838]: Service: eth0/224.0.9.7: Status changed to [Hardware input] [Input on service] [Demuxed packets] [Reassembled packets] 
Jun  7 21:55:38 fsiptv tvheadend[21838]: subscription: "172.30.108.119 [ XBMC Media Center ]" unsubscribing from "RTL Nitro" 
Jun  7 21:55:38 fsiptv tvheadend[21838]: subscription: "172.30.108.119 [ XBMC Media Center ]" subscribing on "N-TV", weight: 150, adapter: "eth0", network: "<N/A>", mux: "224.0.9.5", provider: "<N/A>", service: "<N/A>", quality: 100
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: Signal: 11 in PRG: /usr/local/bin/tvheadend (2.99.26.gfc10a) [da89eeee553903800ec294b230c365b42f3da09f] CWD: /  
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: Fault address 0x48 (Address not mapped)
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: Loaded libraries: /lib/x86_64-linux-gnu/librt.so.1 /lib/x86_64-linux-gnu/libdl.so.2 /usr/lib/x86_64-linux-gnu/libavahi-common.so.3 /usr/lib/x86_64-linux-gnu/libavahi-client.so.3 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 /lib/x86_64-linux-gnu/libpthread.so.0 /lib/x86_64-linux-gnu/libc.so.6 /lib64/ld-linux-x86-64.so.2 /lib/x86_64-linux-gnu/libdbus-1.so.3 /lib/x86_64-linux-gnu/libz.so.1 /lib/x86_64-linux-gnu/libnss_compat.so.2 /lib/x86_64-linux-gnu/libnsl.so.1 /lib/x86_64-linux-gnu/libnss_nis.so.2 /lib/x86_64-linux-gnu/libnss_files.so.2  
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: Register dump [23]: 00007f2cc2ffcd08 000000000000555b 0000000000000001 0000000000000206 0000000001ff5e60 0000000001ff5b50 00007f2cc2ffcce0 00007f2cdc0343a8 00007f2cc2ffcce0 00007f2cda7ebb30 00007f2cd4039120 0000000001ff69d0 00007f2cc2ffcce0 0000000000000000 00007f2ce4917d75 00007f2cda7ebb10 000000000041a26d 0000000000010202 0000000000000033 0000000000000004 000000000000000e fffffffe7ffbfa17 0000000000000048 
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: STACKTRACE
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/trap.c:139 0x42096b
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: ??:0 0x7f2ce4919060
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/htsp.c:1619 0x41a26d
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/streaming.c:288 0x40d50e
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/parsers.c:1350 0x4162fd
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/parsers.c:1092 0x417785
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/parsers.c:332 0x4160b1
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/tsdemux.c:122 0x418b2c
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/tsdemux.c:256 0x418f6e
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: /usr/src/tvheadend/src/iptv_input.c:116 0x4221ad
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: ??:0 0x7f2ce4910efc
Jun  7 21:55:38 fsiptv tvheadend[21838]: CRASH: clone+0x6d  (/lib/x86_64-linux-gnu/libc.so.6)
Jun  7 21:55:38 fsiptv kernel: [1690680.069588] tvheadend[21851]: segfault at 48 ip 000000000041a26d sp 00007f2cda7ebb10 error 4 in tvheadend[400000+8f000]
Jun  7 21:55:38 fsiptv kernel: [1690680.095051] init: tvheadend main process (21838) killed by SEGV signal
Jun  7 21:55:38 fsiptv kernel: [1690680.095161] init: tvheadend main process ended, respawning

There is 60 devices connected to this tvheadend, around 20 of using it simultaneously each day. The crash happens randomnly, sometimes once per day two, sometimes more times a day.
TvHeadend is run on dedicated AtomD252 server, and it is fed by 4 DVBS/IPTV streamers, each having TBS6984 and multicast streaming our 4 multiplexes by dvblast. Some of the channels are also processes by tsdecrypt/oscam and then restreamed to multicast as well, where tvheadend pick them up. Traffic at tvheadend server is around 200Mbps multicast in and peaking 100Mbps htsp out, server is not loaded (90+ % idle).
Let me know, if i can provide more info.