Err, I don't think _mtx_lock_sleep() is guarded in that fashion? I have an old patch to do that but have never committed it. If we want that we should probably change rwlocks and sxlocks to have also not block when panicstr is set.
Seems to me you are backing into interesting territory here- getting a bit more like Solaris.
If you *do* do this, then you really *do* need to stop all other CPUs when you panic, or else it's likely you'll double panic more often than not.
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