What is the meaning of " x86/split lock detection: #AC: crashing the kernel on kernel split_locks and warning on user-space split_locks"

Solution Verified - Updated -

Issue

  • During the boot, the kernel shows the below log message. Is there any issues with the system?
## RHEL8
[    0.000000] x86/split lock detection: disabled

## RHEL9
[    0.000000] x86/split lock detection: #AC: crashing the kernel on kernel split_locks and warning on user-space split_locks

Environment

  • Red Hat Enterprise Linux 8.3 and later
  • Red Hat Enterprise Linux 9

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