[Bug 277559] kldload vmm sometimes hangs kernel on arm64

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

--- Comment #10 from John F. Carr <jfc@mit.edu> ---
There is still a problem, but less common.  One out of five reboots with the
patch the RockPro64 hung the first time I ran kldload.  The ssh session was
responsive for a few seconds:

# kldload vmm
load: 0.12  cmd: kldload 81984 [running] 0.97r 0.00u 0.01s 9% 2596k
load: 0.12  cmd: kldload 81984 [running] 2.46r 0.00u 0.01s 23% 2596k
client_loop: send disconnect: Broken pipe

The last entry in /var/log/messages said:

vgic0: <Virtual GIC v3> on gic0

This machine can't save crash dumps and I don't know if there was a panic.  I
can hook up a serial console if helpful.

If kldload works the first time after reboot it seems to keep working.  This is
an improvement.

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