'panic: trap: memory address not aligned' in 5.4

[Kris Kennaway]

I got this shortly after updating an e450 to 5.4-rc2 (from RELENG_5 of
about 6 weeks ago) and applying marius' clock patch.

panic: tpanic: trap: memory address not aligned
cpuid = -1072483876
KDB: enter: panic
spin lock sched lock held by 0xc0040fb0 for > 5 seconds
panic: trap: fast data access mmu miss
cpuid = 0
KDB: enter: panic

i.e. both CPUs panicked simultaneously.  It hung there, so I can't get
any further debugging.

Kris

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