Keep stack trace of thin provisioning block lock holders

configname: CONFIG_DM_DEBUG_BLOCK_STACK_TRACING

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>Keep stack trace of thin provisioning block lock holders
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Enable this for messages that may help debug problems with the
block manager locking used by thin provisioning.

If unsure, say N.