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

Solution Verified - Updated -


  • 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: 
     [<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.


  • Red Hat Enterprise Linux 7.4+
  • SolidFire SSD SAN LUNs mapped to VMware guest using FC RDM.
  • ESXi 6.0 U3, 6.5 U3, 6.7 U2

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