我之前使用Kdump，尽管开启了Kdump，但是还是死锁问题没能发现原因，于是我又配上了nmi_watchdog，然后奇迹发生了， 系统还是正常死机，但是过了一会儿就利用kexec的快速重启技术重启了。
PID: 1931 TASK: ffff880234c944d0 CPU: 1 COMMAND: "zvol/29"
#0 [ffff88002f627d20] machine_kexec at ffffffff810333eb
#1 [ffff88002f627d80] crash_kexec at ffffffff810a9708
#2 [ffff88002f627e50] oops_end at ffffffff81542a58
#3 [ffff88002f627e80] die_nmi at ffffffff81542be9
#4 [ffff88002f627eb0] nmi_watchdog_tick at ffffffff81543242
#5 [ffff88002f627ef0] default_do_nmi at ffffffff8154264a
#6 [ffff88002f627f30] do_nmi at ffffffff815428a0
#7 [ffff88002f627f50] nmi at ffffffff81542050
[exception RIP: __ticket_spin_lock+20]
RIP: ffffffff81038734 RSP: ffff88021c6e3cf0 RFLAGS: 00000097
RAX: 0000000000006463 RBX: 0000000000000282 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000282 RDI: ffff880225a5ad48
RBP: ffff88021c6e3cf0 R8: ffff88021c6e3cc8 R9: 000000000117e2a2
R10: 0000000000000001 R11: 000000000000000b R12: 0000000000000000
R13: ffff88022a303480 R14: ffff8800314e5070 R15: 0000000000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
--- ---
#8 [ffff88021c6e3cf0] __ticket_spin_lock at ffffffff81038734
#9 [ffff88021c6e3cf8] default_spin_lock_flags at ffffffff810387b9
#10 [ffff88021c6e3d08] _spin_lock_irqsave at ffffffff8154181f
#11 [ffff88021c6e3d28] blk_end_bidi_request at ffffffff812a0d56
#12 [ffff88021c6e3d58] blk_end_request at ffffffff812a0de0
#13 [ffff88021c6e3d68] end_request_agg at ffffffffa030ae8b
#14 [ffff88021c6e3da8] zvol_write_agg at ffffffffa030b0bc
#15 [ffff88021c6e3df8] taskq_thread at ffffffffa01bef47
#16 [ffff88021c6e3ee8] kthread at ffffffff81084946
#17 [ffff88021c6e3f48] kernel_thread at ffffffff810131ea
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