[Bug 277559] kldload vmm sometimes hangs kernel on arm64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277559

--- Comment #7 from John F. Carr <jfc@mit.edu> ---
Moving the set of vbar_el2 was not the cause of improvement.  I just saw two
runs of over 2,000 successful kldloads before a hang without it.  I also saw
the system hang on the first load last night.

I wonder if success of the first load makes the next load more likely to
succeed, e.g. because the module reloads at the same address.

Clock frequency does not seem to matter.  I ran my kldload/kldunload loop with
powerd on running at 1416 MHz and with powerd off running at 600 MHz.

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