# This script is intended to be ran via CRON.

[0] Fix | Delete

[1] Fix | Delete

# It was written to catch opcache deadlocks where opcache cannot

[2] Fix | Delete

# kill a process owned by another user within the same FPM master.

[3] Fix | Delete

# Read more: https://github.com/php/php-src/issues/8072

[4] Fix | Delete

[5] Fix | Delete

# Count all locks with ZendSem in the name and only return ones that are over 20.

[6] Fix | Delete

lslocks | awk '/ZendSem/ {print $9}' | sort | uniq -c | awk '$1 > 20' | while read -r bad_lock; do

[7] Fix | Delete

bad_lock_count=$(echo "${bad_lock}" | awk '{print $1}');

[8] Fix | Delete

bad_lock_name=$(echo "${bad_lock}" | awk '{print $2}');

[9] Fix | Delete

[10] Fix | Delete

lslocks | grep "${bad_lock_name}" | grep READ | awk '/^php-fpm/ {print $2}' | while read -r bad_lock_pid; do

[11] Fix | Delete

# If the string isn't empty, proceed with the kill.

[12] Fix | Delete

if [[ -n "${bad_lock_pid}" ]]; then

[13] Fix | Delete

echo "opcache deadlock discovered: ${bad_lock_count} active locks for ${bad_lock_name} - sending kill: ${bad_lock_pid}" | systemd-cat -p info;

[14] Fix | Delete

kill -9 "${bad_lock_pid}"

[15] Fix | Delete

fi

[16] Fix | Delete

done;

[17] Fix | Delete

unset bad_lock_pid;

[18] Fix | Delete

done

[19] Fix | Delete

[20] Fix | Delete