Issue

The system has locked up and became unresponsive. Intentionally initiated crash dump shows the following call trace on one of the processors:

PID: 3047   TASK: ffff81043c85d820  CPU: 1   COMMAND: "emcpd"
 #0 [ffff81010efaef20] crash_nmi_callback at ffffffff8007c21a
 #1 [ffff81010efaef40] do_nmi at ffffffff800658e5
 #2 [ffff81010efaef50] nmi at ffffffff80064ecf
    [exception RIP: .text.lock.spinlock+0xe]
    RIP: ffffffff80064be8  RSP: ffff81042e11fec8  RFLAGS: 00000086
    RAX: 0000000000000206  RBX: ffff810430611288  RCX: ffffffff884414f8
    RDX: 000000000000324b  RSI: 0000000000000206  RDI: ffffffff88462000
    RBP: ffffffff884414c8   R8: ffff81042e11e000   R9: 0000000000000000
    R10: ffffffff88441578  R11: 0000000000000000  R12: 000000000000ca0f
    R13: 0000000000037528  R14: ffff81043c6152e8  R15: ffff81043c6153b0
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
--- <NMI exception stack> ---
 #3 [ffff81042e11fec8] .text.lock.spinlock at ffffffff80064be8 (via _spin_lock_irqsave)
 #4 [ffff81042e11fec8] PxIocmdWfseWakeup at ffffffff883c9e80 [emcp]
 #5 [ffff81042e11fed8] PowerTimerCallout at ffffffff883cbc37 [emcp]
 #6 [ffff81042e11ff08] PowerServiceDaemonQ at ffffffff883d522d [emcp]
 #7 [ffff81042e11ff48] kernel_thread at ffffffff8005dfb1