System hang during rport deletion waiting on RCU sync

Issue

• System hang during rport deletion waiting on RCU sync:

PID: 2312227  TASK: ffff8d1feef43d80  CPU: 13   COMMAND: "kworker/13:0"
 #0 [ffffb5c271df3af8] __schedule at ffffffffbc08f8cf
 #1 [ffffb5c271df3b90] schedule at ffffffffbc08fcff
 #2 [ffffb5c271df3ba0] schedule_timeout at ffffffffbc0938dd
 #3 [ffffb5c271df3c38] wait_for_completion at ffffffffbc09075f
 #4 [ffffb5c271df3c98] __wait_rcu_gp at ffffffffbb9252e2
 #5 [ffffb5c271df3cd8] synchronize_rcu at ffffffffbb92aaa6
 #6 [ffffb5c271df3d20] device_block at ffffffffbbdb4bb9
 #7 [ffffb5c271df3d48] starget_for_each_device at ffffffffbbdadf05
 #8 [ffffb5c271df3d78] target_block at ffffffffbbdb5588
 #9 [ffffb5c271df3d88] device_for_each_child at ffffffffbbd77f84
#10 [ffffb5c271df3dc0] fc_remote_port_delete at ffffffffc0667070 [scsi_transport_fc]
#11 [ffffb5c271df3de0] qla2x00_mark_device_lost at ffffffffc0b9407c [qla2xxx]
#12 [ffffb5c271df3e20] qlt_free_session_done at ffffffffc0c0e0b1 [qla2xxx]
#13 [ffffb5c271df3e98] process_one_work at ffffffffbb8ce7e7
#14 [ffffb5c271df3ed8] worker_thread at ffffffffbb8cef00
#15 [ffffb5c271df3f10] kthread at ffffffffbb8d4812
#16 [ffffb5c271df3f50] ret_from_fork at ffffffffbc20023f

PID: 3675271  TASK: ffff8d7ec5a93d80  CPU: 0    COMMAND: "oracle_3675271_"
 #0 [fffffe0000007e50] crash_nmi_callback at ffffffffbb84ce93
 #1 [fffffe0000007e58] nmi_handle at ffffffffbb822893
 #2 [fffffe0000007eb0] default_do_nmi at ffffffffbb822d4e
 #3 [fffffe0000007ed0] do_nmi at ffffffffbb822f28
 #4 [fffffe0000007ef0] end_repeat_nmi at ffffffffbc2016b4
    [exception RIP: smp_call_function_single+136]
    RIP: ffffffffbb94e958  RSP: ffffb5c295273be0  RFLAGS: 00000202
    RAX: 0000000000000001  RBX: 00000000026d5906  RCX: 0000000000000000
    RDX: 0000000000000000  RSI: ffffffffbb834710  RDI: 0000000000000031
    RBP: ffffb5c295273c28   R8: ffff8cf7c0a2ac40   R9: 0000000000000000
    R10: ffffb5c295273cb8  R11: 0000000000000000  R12: 0000b6b2072670b8
    R13: 0000000000000001  R14: ffff8cee29ad8fa0  R15: ffff8ceef9f00f00
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #5 [ffffb5c295273be0] smp_call_function_single at ffffffffbb94e958
 #6 [ffffb5c295273c30] aperfmperf_snapshot_cpu at ffffffffbb8347e0
 #7 [ffffb5c295273c40] arch_freq_prepare_all at ffffffffbb83487d
 #8 [ffffb5c295273c68] cpuinfo_open at ffffffffbbb4b01e
 #9 [ffffb5c295273c78] proc_reg_open at ffffffffbbb42131
#10 [ffffb5c295273cb0] do_dentry_open at ffffffffbbac2352
#11 [ffffb5c295273ce0] path_openat at ffffffffbbad6553
#12 [ffffb5c295273db8] do_filp_open at ffffffffbbad8843
#13 [ffffb5c295273ec0] do_sys_open at ffffffffbbac3a54
#14 [ffffb5c295273f18] twnotify_sys_openat at ffffffffc0afa2e8 [twnotify]
#15 [ffffb5c295273f38] do_syscall_64 at ffffffffbb80419b
#16 [ffffb5c295273f50] entry_SYSCALL_64_after_hwframe at ffffffffbc2000ad
....