[Issue 21265] New: Test Suite Heisenbug: FAILED targets: - runnable/testptrref_gc.d in macOS 10.15 x64, DMD (bootstrap)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21265

          Issue ID: 21265
           Summary: Test Suite Heisenbug: FAILED targets: -
                    runnable/testptrref_gc.d in macOS 10.15 x64, DMD
                    (bootstrap)
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Mac OS X
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

I've seen this again and again, some failure with the -J flag not finding
files. Restarting the test suite makes it pass. Only to randomly fail again in
the future. Classifying it as "MAJOR" because it is a constant waste of time
and resources re-running the test suite.

The log file:
----
Test runnable/testptrref_gc.d failed.  The logged output:
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC  -odtest_results/runnable
-oftest_results/runnable/testptrref_gc_0  runnable/testptrref_gc.d 
test_results/runnable/testptrref_gc_0
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC -O -odtest_results/runnable
-oftest_results/runnable/testptrref_gc_1  runnable/testptrref_gc.d 
test_results/runnable/testptrref_gc_1
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC -inline
-odtest_results/runnable -oftest_results/runnable/testptrref_gc_2 
runnable/testptrref_gc.d 
test_results/runnable/testptrref_gc_2
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC -O -inline
-odtest_results/runnable -oftest_results/runnable/testptrref_gc_3 
runnable/testptrref_gc.d 
test_results/runnable/testptrref_gc_3
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC -release
-odtest_results/runnable -oftest_results/runnable/testptrref_gc_4 
runnable/testptrref_gc.d 
test_results/runnable/testptrref_gc_4
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC -O -release
-odtest_results/runnable -oftest_results/runnable/testptrref_gc_5 
runnable/testptrref_gc.d 
test_results/runnable/testptrref_gc_5
/private/var/folders/3y/l0z1x3693dl_8n0qybp4dqwh0000gn/T/cirrus-ci-build/generated/osx/release/64/dmd
-conf= -m64 -Irunnable -lowmem -Jrunnable  -fPIC -inline -release
-odtest_results/runnable -oftest_results/runnable/testptrref_gc_6 
runnable/testptrref_gc.d 
runnable/testptrref_gc.d(3): Error: file `"testptrref.d"` cannot be found or
not in a path specified with `-J`
runnable/testptrref_gc.d(3):        Path(s) searched (as provided by `-J`):
runnable/testptrref_gc.d(3):        [0]: `runnable`

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