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oops_all_cpu_backtrace

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

If this option is set, the kernel will send an NMI to all CPUs to dump their backtraces when an oops event occurs. It should be used as a last resort in case a panic cannot be triggered (to protect VMs running, for example) or kdump can’t be collected. This file shows up if CONFIG_SMP is enabled.

0: Won’t show all CPUs backtraces when an oops is detected. This is the default behavior.

1: Will non-maskably interrupt all CPUs and dump their backtraces when an oops event is detected.

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Last update: 2026-03-30 12:00:00 UTC
Parsed kernel version 6.18 from git

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Updated by Ilya Vasilyev aka Nadz Goldman from Arviol ( vStack dep. ), ITG