process003 fails non-deterministically

e.g. this failure from validate-x86_64-linux-deb9-debug in the threaded2 way:

--- /dev/null	2019-09-24 12:56:15.807406845 +0000
+++ libraries/process/tests/process003.run/process003.run.stderr.normalised	2019-09-24 16:07:35.985339285 +0000
@@ -0,0 +1 @@
+process003: fd:17: hClose: resource vanished (Broken pipe)

Edited Sep 24, 2019 by Ben Gamari

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process003 fails non-deterministically