T3171 doesn't terminate with Interrupted message on Darwin

I am seeing T3171 fail with incorrect stderr output on Darwin (e.g. https://circleci.com/gh/ghc/ghc/7106):

Actual stdout output differs from expected:
--- ./ghci/should_run/T3171.run/T3171.stdout.normalised	2018-07-14 21:24:25.000000000 -0700
+++ ./ghci/should_run/T3171.run/T3171.run.stdout.normalised	2018-07-14 21:24:25.000000000 -0700
@@ -1 +0,0 @@
-Interrupted.
*** unexpected failure for T3171(normal)

Trac metadata

Trac field	Value
Version	8.4.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown/Multiple
Architecture	Unknown/Multiple

changed milestone to %8.6.1

changed weight to 5

added Tbug Trac import labels

Unfortunately it looks like this test is just fragile on Darwin; the same commit failed once but passed in another CircleCI build.

Trac metadata

Trac field	Value
Operating system	Unknown/Multiple → MacOS X
Architecture	Unknown/Multiple → x86_64 (amd64)

mentioned in issue #15463 (closed)

It turns out that this also fails on Linux/i386.

Trac metadata

Trac field	Value
Related	- → #15463 (closed)

changed milestone to %8.8.1

These won't be fixed for in GHC 8.6.

It fails every now and then (not always!) on i386 linux indeed: https://circleci.com/gh/ghc/ghc-diffs/269

mentioned in commit 3040444d

Indeed this also appears to happen (occasionally) on Fedora/amd64.

changed weight to 7

I'm disabling this test for now until we can investigate. Raising priority so this happens.

Trac metadata

Trac field	Value
Priority	normal → high
Operating system	MacOS X → Unknown/Multiple

mentioned in commit 817ba0cf

changed milestone to %8.10.1

added Phigh label

removed milestone