"Serious" validation failures on i686

A very recent run of ./validate on i686 revealed 6 failures, 4 of which I'm hopefully fixing with D5031, but the other two look more serious.

The circle ci build logs are here: https://circleci.com/gh/ghc/ghc/7578

One of the remaining failures in particular seems somewhat critical:

Wrong exit code for heapprof001(prof_hc_hb)(expected 0 , actual 139 )
Stdout ( heapprof001 ):
a <= 
a <= 
a <= 
a <= 
a <= 
a <= 
a <=
Stderr ( heapprof001 ):
Segmentation fault
*** unexpected failure for heapprof001(prof_hc_hb)

While the other one might be a lot simpler:

Actual stdout output differs from expected:
--- ./ghci/should_run/T3171.run/T3171.stdout.normalised	2018-07-31 05:27:01.821192706 +0000
+++ ./ghci/should_run/T3171.run/T3171.run.stdout.normalised	2018-07-31 05:27:01.821192706 +0000
@@ -1 +0,0 @@
-Interrupted.
*** unexpected failure for T3171(normal)

I have not investigated any of those yet, but the first one does seem like a bug.

Trac metadata

Trac field	Value
Version	8.5
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

mentioned in issue #15382

mentioned in issue #15383

changed weight to 5

added Tbug Trac import labels

The T3171 failure is being tracked as #15383.

Trac metadata

Trac field	Value
Related	- → #15383

And the heapprof001 failure is being tracked as #15382.

Trac metadata

Trac field	Value
Related	#15383 → #15382, #15383

closed

Closing this in favor of #15383 and #15382.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedDuplicate

added Pnormal label