softlockup_panic

file: /proc/sys/kernel/softlockup_panic
variable: kernel.softlockup_panic
Official reference

This parameter can be used to control whether the kernel panics when a soft lockup is detected.

= ============================================
0 Don't panic on soft lockup.
1 Panic on soft lockup.
= ============================================

This can also be set using the softlockup_panic kernel parameter.