runtime: `unexpected fault address 0x349dc4` on `openbsd-arm64-jsing`

[bcmills]

#!watchflakes
post <- log ~ `unexpected fault address 0x349dc4`

Pulled out from #55161, since this failure mode seems more consistent than the others.

(attn @4a6f656c, @golang/openbsd; CC @golang/runtime)

[bcmills]

Hmm. The last of those seems to have occurred in April. Maybe it's fixed?

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)