RHEL 7 VM takes more than 10 minutes to boot with FC RDM LUNs

Issue

• RHEL 7 VM takes more than 10 minutes to boot with FC RDM LUNs.
  During boot the process, console logs showed following errors and call traces:

  sd 2:0:7:0: timing out command, waited 120s 
  INFO: task systemd-udevd:261 blocked for more than 120 seconds. 
  "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
  systemd-udevd D ffff946d2b30a080 0 261 259 0x00000000 
  Call Trace: 
  schedule+0x29/0x70 
   [<ffffffff810c9355>] async_synchronize_cookie_domain+0x85/0x150 
   [<ffffffff810c2d00>] ? wake_up_atomic_t+0x30/0x30 
   [<ffffffff810c9457>] async_synchronize_full+0x17/0x20 
   [<ffffffff81118fe7>] load_module+0x2787/0x2bc0 
   [<ffffffff813a3030>] ? ddebug_proc_write+0x100/0x100 
   [<ffffffff8111950f>] SyS_init_module+0xef/0x140 
   [<ffffffff81774ddb>] system_call_fastpath+0x22/0x27 
   [<ffffffff81774d21>] ? system_call_after_swapgs+0xae/0x146 
   sd 2:0:8:0: timing out command, waited 120s 
  

• Same issue does not occur while using iSCSI RDM LUNs.