RHEL7: System crashed at RIP: xprt_iter_get_next

Issue

• System crash due to "BUG: unable to handle kernel paging request at ffffffff000001a0"
• System crashed at RIP: xprt_iter_get_next+0x9

crash> bt 
PID: 27838  TASK: ffff8800350bdee0  CPU: 3   COMMAND: "kworker/u8:1"
 #0 [ffff88040d3879e0] machine_kexec at ffffffff8105c52b
 #1 [ffff88040d387a40] __crash_kexec at ffffffff81104a42
 #2 [ffff88040d387b10] crash_kexec at ffffffff81104b30
 #3 [ffff88040d387b28] oops_end at ffffffff816ad338
 #4 [ffff88040d387b50] no_context at ffffffff8169d36a
 #5 [ffff88040d387ba0] __bad_area_nosemaphore at ffffffff8169d400
 #6 [ffff88040d387be8] bad_area_nosemaphore at ffffffff8169d56a
 #7 [ffff88040d387bf8] __do_page_fault at ffffffff816b01fe
 #8 [ffff88040d387c58] trace_do_page_fault at ffffffff816b0456
 #9 [ffff88040d387c98] do_async_page_fault at ffffffff816afaea
#10 [ffff88040d387cb0] async_page_fault at ffffffff816ac5f8
    [exception RIP: xprt_iter_get_next+0x9]
    RIP: ffffffffc0063f49  RSP: ffff88040d387d60  RFLAGS: 00010246
    RAX: ffff880403bce100  RBX: ffff880403bce100  RCX: 0000000000000017
    RDX: 0000000225c17d03  RSI: 0000000000006280  RDI: ffffffff00000190
    RBP: ffff88040d387d60   R8: 00000000cd4b9b2d   R9: ffffffff81185465
    R10: dfeef653caec1660  R11: ffffffff00000000  R12: ffffffff00000000
    R13: ffff88040d387da0  R14: ffff8803fd317400  R15: 0000000000000100
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#11 [ffff88040d387d68] rpc_run_task at ffffffffc003e7b5 [sunrpc]
#12 [ffff88040d387d98] rpc_call_async at ffffffffc003ea2f [sunrpc]
#13 [ffff88040d387df8] nfsd4_run_cb_work at ffffffffc02ac476 [nfsd]
#14 [ffff88040d387e20] process_one_work at ffffffff810a882a
#15 [ffff88040d387e68] worker_thread at ffffffff810a94f6
#16 [ffff88040d387ec8] kthread at ffffffff810b099f
#17 [ffff88040d387f50] ret_from_fork at ffffffff816b4fd8
crash>