At rport loss, deadlock in lpfc_worker thread and multipathd

Solution Unverified - Updated -

Issue

  • Experienced a hard lockup in multipathd that was waiting on the same lock as the lpfc_worker_0 thread resulting in system panic.
PID: 623    TASK: ffff880870f58aa0  CPU: 3   COMMAND: "fc_wq_1"
 #0 [ffff880028266e90] crash_nmi_callback at ffffffff810321a6
 #1 [ffff880028266ea0] notifier_call_chain at ffffffff815300f5
 #2 [ffff880028266ee0] atomic_notifier_call_chain at ffffffff8153015a
 #3 [ffff880028266ef0] notify_die at ffffffff810a4eae
 #4 [ffff880028266f20] do_nmi at ffffffff8152ddbb
 #5 [ffff880028266f50] nmi at ffffffff8152d680
    [exception RIP: scsi_remove_target+147]
    RIP: ffffffff8138de93  RSP: ffff880870f5ddd0  RFLAGS: 00000046
    RAX: ffff88022bc91c08  RBX: ffff88022bc91c00  RCX: 0000000000004cc2
    RDX: 0000000000000286  RSI: 0000000000000286  RDI: ffff88107074c050
    RBP: ffff880870f5de10   R8: ffffffff81c09cc0   R9: 0000000000000000
    R10: 0000a5f8ffffff38  R11: 0000000000000000  R12: ffff88022bc91c00
    R13: 0000000000000286  R14: ffff880870cc5060  R15: ffff88107074c010
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #6 [ffff880870f5ddd0] scsi_remove_target at ffffffff8138de93
 #7 [ffff880870f5de18] fc_starget_delete at ffffffffa008c596 [scsi_transport_fc]
 #8 [ffff880870f5de38] worker_thread at ffffffff81097fe0
 #9 [ffff880870f5dee8] kthread at ffffffff8109e66e
#10 [ffff880870f5df48] kernel_thread at ffffffff8100c20a

Environment

  • RHEL 6.6Z stream - 2.6.32-504.12.2.el6.x86_64

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