panic_on_io_nmi

file: /proc/sys/kernel/panic_on_io_nmi
variable: kernel.panic_on_io_nmi
Official reference

Controls the kernel’s behavior when a CPU receives an NMI caused by an IO error.

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0 Try to continue operation (default).
1 Panic immediately. The IO error triggered an NMI. This indicates a
  serious system condition which could result in IO data corruption.
  Rather than continuing, panicking might be a better choice. Some
  servers issue this sort of NMI when the dump button is pushed,
  and you can use this option to take a crash dump.
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