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: /usr/lib/udev/ [ drwxr-xr-x ]
Uname\Kernel: Linux server.kxo.bgz.mybluehostin.me 3.10.0-1160.119.1.el7.tuxcare.els19.x86_64 #1 SMP Mon Mar 31 17:29:00 UTC 2025 x86_64
Server: Apache
PHP Version: 8.2.28 [ PHP INFO ]
Operating System: Linux
Server Ip: 162.240.163.222
Your Ip: 216.73.216.114
Date Time: 2025-07-11 06:40:08
User: dilseshaadi (1027) | Group: dilseshaadi (1027)
Safe Mode: OFF
Disable Function: exec,passthru,shell_exec,system

name : kdump-udev-throttler
#!/bin/bash
# This util helps to reduce the workload of kdump service restarting
# on udev event. When hotplugging memory / CPU, multiple udev
# events may be triggered concurrently, and obviously, we don't want
# to restart kdump service for each event.

# This script will be called by udev, and make sure kdump service is
# restart after all events we are watching are settled.

# On each call, this script will update try to aquire the $throttle_lock
# The first instance acquired the file lock will keep waiting for events
# to settle and then reload kdump. Other instances will just exit
# In this way, we can make sure kdump service is restarted immediately
# and for exactly once after udev events are settled.

throttle_lock="/var/lock/kdump-udev-throttle"

exec 9>$throttle_lock
if [ $? -ne 0 ]; then
        echo "Failed to create the lock file! Fallback to non-throttled kdump service restart"
        /bin/kdumpctl reload
        exit 1
fi

flock -n 9
if [ $? -ne 0 ]; then
        echo "Throttling kdump restart for concurrent udev event"
        exit 0
fi

# Wait for at least 1 second, at most 4 seconds for udev to settle
# Idealy we will have a less than 1 second lag between udev events settle
# and kdump reload
sleep 1 && udevadm settle --timeout 3

# Release the lock, /bin/kdumpctl will block and make the process
# holding two locks at the same time and we might miss some events
exec 9>&-

/bin/kdumpctl reload

exit 0
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