Verify via `sysctl -T` with kernel built with KASAN or KMSAN (can not built with both).
Escape to boot loader prompt:
```
set kern.boottrace.enabled=1
set vm.pgcache_zone_max_pcpu=1024
set vm.numa.disabled=1
set debug.kasan.disabled=1
boot
```
```
# sysctl -T kern.boottrace
kern.boottrace.table_size: 3000
kern.boottrace.shutdown_trace_threshold: 0
kern.boottrace.shutdown_trace: 0
kern.boottrace.enabled: 1
# sysctl -T vm.pgcache_zone_max_pcpu
vm.pgcache_zone_max_pcpu: 1024
# sysctl -T vm.numa.disabled
vm.numa.disabled: 1
# sysctl -T debug.kasan
debug.kasan.disabled: 1
debug.kasan.panic_on_violation: 1
```
Kernel with KMSAN:
```
# sysctl -T debug.kmsan.disabled
debug.kmsan.disabled: 0
```