- Messages of the type:
- "NMI watchdog: BUG: soft lockup - CPU#25 stuck for 22s! [137.215.75.246-:26291]"
- appear periodically in the logs. This is a kernel bug, which should have been fixed already.
RedHat Reference:Â https://access.redhat.com/solutions/2073603
- To make this parameter persistent across reboots by adding following line inÂ
/etc/sysctl.conf  file:
For RHEL/Centos below 6: kernel.softlockup_thresh=30 in /etc/sysctl.conf
For RHEL/Centos 6/7+: kernel.watchdog_thresh=60 in /etc/sysctl.conf
In RHEL 6 and above, the threshold is now named "watchdog_thresh" and can be set to no higher than 60: - To make this change in RHEL 6 and above, set the tuneable kernel.watchdog_thresh  in sysctl.conf
For RHEL/Centos 7: echo 60 > /proc/sys/kernel/watchdog_thresh and check with: vmstat There should be very few entries. |