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Dir : /proc/thread-self/root/proc/self/root/proc/self/root/proc/self/root/opt/maint/bin/
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Dir : //proc/thread-self/root/proc/self/root/proc/self/root/proc/self/root/opt/maint/bin/opcache_check.sh

# This script is intended to be ran via CRON.

# It was written to catch opcache deadlocks where opcache cannot
# kill a process owned by another user within the same FPM master.
# Read more: https://github.com/php/php-src/issues/8072

# Count all locks with ZendSem in the name and only return ones that are over 20.
lslocks | awk '/ZendSem/ {print $9}' | sort | uniq -c | awk '$1 > 20' | while read -r bad_lock; do
    bad_lock_count=$(echo "${bad_lock}" | awk '{print $1}');
    bad_lock_name=$(echo "${bad_lock}" | awk '{print $2}');

    lslocks | grep "${bad_lock_name}" | grep READ | awk '/^php-fpm/ {print $2}' | while read -r bad_lock_pid; do
        # If the string isn't empty, proceed with the kill.
        if [[ -n "${bad_lock_pid}" ]]; then
            echo "opcache deadlock discovered: ${bad_lock_count} active locks for ${bad_lock_name} - sending kill: ${bad_lock_pid}" | systemd-cat -p info;
            kill -9 "${bad_lock_pid}"
        fi
    done;
    unset bad_lock_pid;
done