cmd/dist,os/exec: `wait: process not found` on plan9

[bcmills]

#!watchflakes
post <- builder ~ `^plan9` && `wait: process not found`

greplogs -l -e 'wait: process not found'
2022-05-13T14:14:49-d4dd7ac/plan9-arm

go tool compile: wait: process not found
compile version devel d4dd7acd2e9654e9769f4fa131540ad4e991adb5 buildID=G3PcgF7SXegDw3GqE4Js/V68-sYS-Sxc-yKcbosNJ/bIR2LSSstZeqop_8ZntQ/0zr6Y5NjWTT-1t3cZfVV
go tool dist: Failed: exit status: 'go 45081: 1'

2022-03-11T00:42:08-9743e9b/plan9-amd64-0intro

go tool dist: FAILED: /tmp/workdir-gnot/go/pkg/tool/plan9_amd64/compile -std -pack -o /tmp/go-tool-dist-470873418/cmd/go/internal/fsys/_go_.a -p cmd/go/internal/fsys -importcfg /tmp/go-tool-dist-470873418/cmd/go/internal/fsys/importcfg /tmp/workdir-gnot/go/src/cmd/go/internal/fsys/fsys.go: wait: process not found

build failed: make script failed: exit status: 'make.rc 209: dist 250: 2'

2019-08-27T17:41:33-b9bf2f5/plan9-arm

go tool compile: wait: process not found
compile version devel b9bf2f5d2bb117f806aef84d99ad60adbcb0cc21 buildID=l6KQKXWzKlGfRW1ff1_I/SU8e49NyZ8emdKwkQAZU/GUGyiQ4IzdZgjhej2uKY/og3zPT3p_28I-IOTINrM
2019/08/29 11:41:56 Failed: exit status: 'go 36389: 1'
2019/08/29 11:42:07 FAILED

(attn @golang/plan9)

[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.)