T9405 sporadic failure

I just got a failure on travis with T9405 on https://travis-ci.org/ghc/ghc/builds/237325270.

The error:

--- /dev/null	2017-05-29 08:06:46.967079000 +0000
+++ /tmp/ghctest-eo4toy/test   spaces/./rts/T9405.run/T9405.run.stderr.normalised	2017-05-29 23:20:55.665885000 +0000
@@ -0,0 +1 @@
+/bin/sh: 4: kill: No such process

What I suspect happens is that under some scheduling and with CPU contention, the test instead of timing out just finishes normally. Perhaps increasing the sleep time from 2s should be enough to mitigate.

Trac metadata

Trac field	Value
Version	8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	bgamari
Operating system
Architecture