With a tmpfs mounted on /tmp:

$ cd /tmp
$ dd if=/dev/zero of=0 bs=1M ; sync ; sleep 5 ; rm 0

results in dmesg getting spammed with:

uao_flush: strange, got an out of range flush (fixed)

If the tmpfs is large enough (larger than physical RAM, maybe?) another
error happens (I don't have it handy right now) and the system usually
winds up wedged badly enough that "boot dump" from ddb won't work as
designed. I can reproduce this on request.

-- 
  Shawn K. Quinn
  skqu...@rushpost.com

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