The 3rd-party module "vmsecmod" caused a deadlock scenario between mm_update_next_owner() and taskexit_event_handler()

Issue

• Kernel crash (hard lockup) with the following call trace:

NMI watchdog: Watchdog detected hard LOCKUP on cpu 11

crash> bt
PID: 1234  TASK: ffff9b12bd740000  CPU: 11  COMMAND: "task"
 #0 [ffff9b22bd548980] machine_kexec at ffffffffbca66044
 #1 [ffff9b22bd5489e0] __crash_kexec at ffffffffbcb22ee2
 #2 [ffff9b22bd548ab0] panic at ffffffffbd17952c
 #3 [ffff9b22bd548b30] nmi_panic at ffffffffbca9ba6f
 #4 [ffff9b22bd548b40] watchdog_overflow_callback at ffffffffbcb4f751
 #5 [ffff9b22bd548b58] __perf_event_overflow at ffffffffbcba9037
 #6 [ffff9b22bd548b90] perf_event_overflow at ffffffffbcbb2834
 #7 [ffff9b22bd548ba0] handle_pmi_common at ffffffffbca0a9a0
 #8 [ffff9b22bd548de0] intel_pmu_handle_irq at ffffffffbca0ac7f
 #9 [ffff9b22bd548e38] perf_event_nmi_handler at ffffffffbd189031
#10 [ffff9b22bd548e58] nmi_handle at ffffffffbd18a93c
#11 [ffff9b22bd548eb0] do_nmi at ffffffffbd18ac18
#12 [ffff9b22bd548ef0] end_repeat_nmi at ffffffffbd189d9c
    [exception RIP: queued_write_lock_slowpath+0x62]
    RIP: ffffffffbcb18212  RSP: ffff9b1198fabc40  RFLAGS: 00000006
    RAX: 0000000000000101  RBX: ffffffffbd607080  RCX: 0000000000000001
    RDX: 00000000000000ff  RSI: 0000000000000000  RDI: ffffffffbd607084
    RBP: ffff9b1198fabc50   R8: 0000000000000101   R9: 000000000000fff9
    R10: 0000000000000000  R11: 0000000000000000  R12: ffffffffbd607084
    R13: ffff9b12bd740000  R14: ffff9b12bd73fff0  R15: ffff9b12bd740000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
#13 [ffff9b1198fabc40] queued_write_lock_slowpath at ffffffffbcb18212
#14 [ffff9b1198fabc58] _raw_qwrite_lock at ffffffffbd1888b1
#15 [ffff9b1198fabc68] tasklist_write_lock_irq at ffffffffbca981eb
#16 [ffff9b1198fabc78] release_task at ffffffffbcaa0b14
#17 [ffff9b1198fabce0] do_exit at ffffffffbcaa273c
#18 [ffff9b1198fabd78] do_group_exit at ffffffffbcaa2bcf
#19 [ffff9b1198fabda8] get_signal_to_deliver at ffffffffbcab3aee
#20 [ffff9b1198fabe40] do_signal at ffffffffbca2c527
#21 [ffff9b1198fabf30] do_notify_resume at ffffffffbca2cc32
#22 [ffff9b1198fabf50] int_signal at ffffffffbd19322f
    RIP: 00007f8d659a168c  RSP: 00007f8cc1a67680  RFLAGS: 00000246
    RAX: fffffffffffffe00  RBX: 0000000000000000  RCX: ffffffffffffffff
    RDX: 0000000000000003  RSI: 0000000000000080  RDI: 00007f8c78029a84
    RBP: 00007f8cc1a67720   R8: 00007f8c78029a00   R9: 0000000000000001
    R10: 0000000000000000  R11: 0000000000000246  R12: 00007f8c78029a50
    R13: 0000000000000000  R14: 00007f8c78028800  R15: 0000000000000000
    ORIG_RAX: 00000000000000ca  CS: 0033  SS: 002b