T-signals-child fails in threaded2 way

While working on !14 (closed) I found that T-signals-child fails in the threaded2 way in both the validate-x86_64-linux-deb9-debug and validate-x86_64-linux-deb9-hadrian jobs:

--- /dev/null	2019-10-04 01:12:54.143891187 +0000
+++ runghc/T-signals-child.run/T-signals-child.run.stdout.normalised	2019-10-04 05:28:38.854113713 +0000
@@ -0,0 +1,3 @@
+Child process: 11526, real process: 11526
+Expected "HUP", received: "No signal receivHeUdP"
+Expected ExitFailure 42, received ExitFailure 41

Edited Oct 05, 2019 by Ben Gamari

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T-signals-child fails in threaded2 way