As titled, I am using CentOS 6.10

Here is part of my shell script, it runs find manually.

#!/bin/sh
backup_dir="/mnt/backup/website"
all_web="$(</mnt/backup/list.txt)"

for web in $all_web
do
    IFS=',' read -ra arraydata <<< "$web"
    tar zcvf $backup_dir/${arraydata[0]}\_$(date +%Y%m%d).tar.gz ${arraydata[1]}
done
exit 0;

The settings in /etc/crontab

0 22 * * * root sh /mnt/backup/backup.sh

I have tried to print the script's logs, but nothing was found, the log just shows that it was stopped.

/mnt/website/corey/public/files/111.pdf
/mnt/website/corey/public/files/222.pdf
/mnt/website/corey/public/files/333.pdf
/mnt/website/corey/pub

Looked through the limits, don't know which one would cause the issue.

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 65536
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65535
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 4096
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

Inspected the system using these commands, all of them showed nothing.

dmesg | grep -i "killed process"
dmesg | grep -i "out of memory"
dmesg | grep -i "corn"
dmesg | grep -i "backup"
grep -i "sigkill" /var/log/messages
grep -i "limit" /var/log/messages

Didn't find any error message in /var/log/cron either.

Any idea would really appreciated.