[Bug 28792] New: Random advapi32:cred test failures on Mac

http://bugs.winehq.org/show_bug.cgi?id=28792

Bug #: 28792
           Summary: Random advapi32:cred test failures on Mac
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: advapi32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

While bringing up a Mac OS build-slave for Dan Kegel's new buildbot, I often
encounter failures in advapi32:cred that I can't seem to reproduce manually
(i.e. by running the test directly). The failures look like this:

cred.c:318: Test succeeded inside todo block: expected CredentialBlobSize of 0
but got 0
cred.c:318: Test succeeded inside todo block: expected NULL credentials but got
0x0
cred.c:328: Test failed: CredReadA failed with error 1168
cred.c:392: Tests skipped: CRED_TYPE_DOMAIN_VISIBLE_PASSWORD credentials are
not supported or are disabled. Skipping

These failures for some reason do not show up when I run the test myself by
cd'ing to dlls/advapi32/tests and running:

make cred.ok

Is there something I'm missing?