[Bug 213371] panic: spin lock held too long

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213371

--- Comment #60 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Wojciech Giel from comment #59)
Thank you!

TLDR version of the screenshot for anyone else interested in the problem:
one thread panics because it waits "too long" to acquire the ipi spin lock,
the lock is held by a thread waiting for the targeted tlb shootdown to be
executed by other cpus, the rest of the cpus are idle, acpi_cpu_idle_mwait is
used for that.
Interesting attachments:
https://bz-attachments.freebsd.org/attachment.cgi?id=176718
https://bz-attachments.freebsd.org/attachment.cgi?id=176719
https://bz-attachments.freebsd.org/attachment.cgi?id=176720

Wojciech,
could you please try setting the following at loader prompt before booting the
kernel?

debug.acpi.disabled=mwait

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