What does a "panic: trap 11" mean, and what can I do about it?

[Chris Siebenmann]

 My 3B1 has been dying with this a lot recently, so I'd like to find
out what this panic means, what it's caused by, and what (if anything)
I can do about it.

 Anyone have any information?

[My Motorola 68K handbook says exception 11 is "line 1111 emulation" -
 is this what this panic is referring to, or is it an actual TRAP
 opcode with a garbage value?]
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