> > All my slaves' /tmp's are polluted with regrtest fluff.

> Which "regrtest fluff" exactly?

I was being lazy when I wrote that.  By "regrtest fluff" I was referring to lingering files/directories in /tmp, owned by cpython, starting with tmp*.  Few examples below.

openbsd51-x64-1% ls -l /tmp
total 32
drwxr-xr-x  2 root     wheel  512 Aug 18 05:40 aucat
drwx------  4 cpython  wheel  512 Sep 19 02:26 tmp03dyjv
-rw-------  1 cpython  wheel    3 Sep 19 02:03 tmp4t3_bk
-rw-------  1 cpython  wheel    3 Sep 18 05:02 tmp5ljha3
-rw-------  1 cpython  wheel    3 Sep 18 05:02 tmp7p3sht
-rw-------  1 cpython  wheel    0 Sep 19 05:34 tmpCFMYVJ
-rw-------  1 cpython  wheel    3 Sep 19 02:34 tmpcnwqcn
-rw-------  1 cpython  wheel    3 Sep 19 02:34 tmpk0gthu
-rw-------  1 cpython  wheel    3 Sep 19 02:03 tmpmf973r
-rw-------  1 cpython  wheel    0 Sep 19 05:34 tmpqO20FC

dragonfly30-x86-1% ls -l /tmp | grep cpython
drwx------  1 cpython  wheel     0 Aug 22 03:46 ssh-v3WDeO7FhO
-rw-------  1 cpython  wheel     3 Sep 14 16:05 tmp31idrc
-rw-------  1 cpython  wheel     3 Sep 11 15:58 tmp34z8iv
-rw-------  1 cpython  wheel     3 Sep 18 05:06 tmp43uhjt
-rw-------  1 cpython  wheel     3 Sep 19 02:03 tmp4jypkx
-rw-------  1 cpython  wheel     3 Sep 12 04:31 tmp4odqso
-rw-------  1 cpython  wheel     3 Sep 12 20:36 tmp6acej6
-rw-------  1 cpython  wheel     3 Sep 12 16:22 tmp9m5vie
-rw-------  1 cpython  wheel     3 Sep 11 16:15 tmp9oj443
-rw-------  1 cpython  wheel     3 Sep 12 20:10 tmpb086ow
-rw-------  1 cpython  wheel     3 Sep 12 14:02 tmpcm0s2g
-rw-------  1 cpython  wheel     3 Sep 11 16:15 tmpd81jie
-rw-------  1 cpython  wheel     3 Sep 12 17:05 tmpdm8vv9
-rw-------  1 cpython  wheel     3 Sep 15 23:01 tmpef4d2m
-rw-------  1 cpython  wheel     3 Sep 18 05:06 tmpel_xi_
-rw-------  1 cpython  wheel     3 Sep 12 04:31 tmpf41fj3
-rw-------  1 cpython  wheel     3 Sep 11 12:08 tmpi94ajz
-rw-------  1 cpython  wheel     3 Sep 19 02:25 tmpilpy7y
-rw-------  1 cpython  wheel     3 Sep 15 22:27 tmpiq1yo9
-rw-------  1 cpython  wheel     3 Sep 13 16:36 tmpkq6d8i
-rw-------  1 cpython  wheel     3 Sep 11 12:28 tmpkxqa4a
-rw-------  1 cpython  wheel     3 Sep 19 02:25 tmpl35290
-rw-------  1 cpython  wheel     3 Sep 11 12:08 tmpn1dq2c
-rw-------  1 cpython  wheel     3 Sep 12 17:05 tmpnxrnxp
-rw-------  1 cpython  wheel     3 Sep 19 02:03 tmpocz5ux
-rw-------  1 cpython  wheel     3 Sep 14 16:05 tmppsebwf
-rw-------  1 cpython  wheel     3 Sep 11 13:50 tmpptpcep
-rw-------  1 cpython  wheel     3 Sep 15 22:27 tmpqk1s3k
-rw-------  1 cpython  wheel     3 Sep 12 14:02 tmprk8uxy
-rw-------  1 cpython  wheel     3 Sep 11 13:50 tmprqmmfw
-rw-------  1 cpython  wheel     3 Sep 13 16:36 tmps99aky
-rw-------  1 cpython  wheel     3 Sep 11 15:58 tmpsfsmoc
-rw-------  1 cpython  wheel     3 Sep 12 20:36 tmpt8_0vu
-rw-------  1 cpython  wheel     3 Sep 15 23:01 tmpthosfe
-rw-------  1 cpython  wheel     3 Sep 11 12:28 tmpwhsp9p
-rw-------  1 cpython  wheel     3 Sep 12 20:10 tmpy5774k
-rw-------  1 cpython  wheel     3 Sep 12 16:22 tmpzgafbz


oxygen% ls -l /tmp | grep cpython
drwxr-xr-x 3 root    cpython   96 Aug 31 15:41 screens
-rw------- 1 cpython cpython    0 Sep 19 05:30 tmp249ZUA
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpAvStO1
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpFLfr2x
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpOYB_X6
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpP1Hsdf
-rw------- 1 cpython cpython    0 Sep 19 05:30 tmpTqctqQ
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpUW1Gov
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpYU0lzE
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpazia2w
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpgemyJY
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpkfg0aZ
drwx------ 2 cpython cpython   96 Sep 19 05:31 tmpt1e0Jc