Flakey target

modulename: dm-flakey.ko

configname: CONFIG_DM_FLAKEY

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>Flakey target
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
A target that intermittently fails I/O for debugging purposes.

source code: