Block manager locking

configname: CONFIG_DM_DEBUG_BLOCK_MANAGER_LOCKING

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>Block manager locking
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Block manager locking can catch various metadata corruption issues.

If unsure, say N.