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hung task debugging: Inject NMI when hung and going to panic
Send an NMI to all CPUs when a hung task is detected and the hung task code is configured to panic. This gives us a fairly uptodate snapshot of all CPUs in the system. This lets us get stack trace of all CPUs which makes life easier trying to debug a deadlock, and the NMI doesn't change anything since the next step is a kernel panic. Signed-off-by: Sasha Levin <firstname.lastname@example.org> Cc: Linus Torvalds <email@example.com> Cc: Andrew Morton <firstname.lastname@example.org> Link: http://email@example.com [ extended the changelog a bit ] Signed-off-by: Ingo Molnar <firstname.lastname@example.org>
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