Segmentation fault on bash script - linux

Question

i have a bash script that shows "Segment Violation" on line
sp-sc-auth "${sopUrl}" 8809 8908 > /dev/null &
but when sp-sc-auth is executed from terminal works fine
I set:
set -o pipefail
set -o errexit
set -o xtrace
set -o nounset
end script continue executing but throws that "Segment Violation" error...
System is a debian 64 bits
Thanks in advance
Regars
The ugly code:
#!/usr/bin/env bash
# Init
set -o pipefail
set -o errexit
#set -o xtrace
set -o nounset
__DIR__="$(cd "$(dirname "${0}")"; echo $(pwd))"
__BASE__="$(basename "${0}")"
__FILE__="${__DIR__}/${__BASE__}"
ARG1="${1:-Undefined}"
display_usage() {
scriptName=$(basename $0)
echo -e "Uso:\n "${scriptName}" [6,7,8,9,10 o 12]"
echo "Sin especificar el canal, búsqueda de retransmisiones"
}
parse_arenavision() {
url="http://www.arenavision.in/agenda"
if ! av=$(curl -s "${url}");then
echo "Sin conexión"
exit 1
fi
started="off"
declare -a _list
element=""
while read line
do
if [[ $line =~ (([0-9][0-9]+/[0-9]+/[0-9]+.*)) ]]; then
element=$(echo "${BASH_REMATCH[0]}" | sed -r 's#CET|AV([^6789]|1[02])##g; s#<br />##g; s#//|&.*;##g; s#/\s*$##g; s#INGLATERRA/PREMIER LEAGUE#PREMIER#g; s#ITALIA/SERIE A#SERIE A#g; s#ITALIA/SERIE A#SERIE A#g;' | tr -dc '[:print:]')
if [[ "${element}" =~ (.*AV[6789]|.*AV10|.*AV12) ]]; then
_list+=("${element}")
fi
started="on"
else
if [[ ${started} == "on" ]]; then
break
fi
fi
done <<< "${av}"
for i in "${_list[#]}"; do
if [[ "${i}" =~ (.*BALONCESTO.*) ]]; then
echo -e "\e[92m${i}\e[0m"
elif [[ "${i}" =~ (.*LIGA BBVA.*) ]]; then
echo -e "\e[37m${i}\e[0m"
else
echo "${i}"
fi
done
}
case $ARG1 in
"Undefined" )
parse_arenavision
exit 0
;;
[6789] )
page="${ARG1}"
;;
10 )
page="${ARG1}"
;;
* )
display_usage
exit 1
;;
esac
# Delete "zombies"
if pgrep -f "sp-sc"
then
kill -9 `pgrep -f "sp-sc-auth"`
fi
url="http://www.arenavision.in/arenavision$page"
# Get url content and url sop
if ! content=$(curl -s "${url}");then
echo "Sin conexión"
fi
if [[ $content =~ (sop://([A-Za-z0-9_]+|\.)+:[0-9]+) ]]; then
sopUrl=${BASH_REMATCH[1]}
else
echo "No se ha encontrado la url"
exit 1
fi
# Connect ArenaVision 1
children=""
trap 'kill $children 1>/dev/null 2>&1; exit 143' EXIT
sp-sc-auth "${sopUrl}" 8809 8908 > /dev/null &
children="$!"
# Check if exists
line='[ ]'
for i in {0..15}
do
replace="${line/ /#}"
line=$replace
echo -ne "Comprobando sopcast ${replace}" \\r
sleep 1
done
echo -ne "\033[2K"
if ! kill -0 "${children}" 1>/dev/null 2>&1; then
echo "Sin emisión"
exit 1
else
echo -ne "Comprobando sopcast [ OK ]" \\r
echo
fi
# Open VLC player
line='[ ]'
for i in {0..25}
do
replace="${line/ /#}"
line=$replace
echo -ne "Cargando reproductor ${replace}" \\r
sleep 1
done
if ! kill -0 "${children}" 1>/dev/null 2>&1; then
echo "Fallo en recepción"
exit 1
else
vlc http://localhost:8908/tv.asf 1>/dev/null 2>&1
echo -ne "\033[2K"
fi
exit 0

Answer 1

errexit cannot work on programs run in the background, so this is unsurprising -- the inline command is simply starting a background process, and that (starting a background process) succeeds, even if the process itself subsequently fails.
If you call wait $! subsequently, then errexit will be able to take effect, as the wait call will exit with the exit status of the program itself. (Of course, if you can call wait $!, then this raises the question of why you were backgrounding the initial program to start with).
If you always want to kill the parent script if the child fails, you can do this instead:
(sp-sc-auth "$sopUrl" 8809 8908 >/dev/null || kill $$) &
$$ evaluates to the PID of the parent shell, not the subshell, so this will act accordingly.
As for the segfault itself, "program X segfaults" is a question too vague to be addressed here. To even start debugging that, you'd need to collect the core dump created on its failure (enabling cores if necessary), install debug symbols for sopcast, and use gdb to collect a stack trace from the core file created on failure.