graphviz testsuite seems to be broken.
1. coredumps on several architectures,
2. if there is stderr output during the test (e.g. warning about missing font), the test is not further evaluated and seems to pass,
3. nshare samples seems to be outdated.
There were proposed patches for first two cases in original bugzilla: case 1: https://bugzilla.redhat.com/attachment.cgi?id=455022&action=diff case 2: https://bugzilla.redhat.com/attachment.cgi?id=455023&action=diff
For case 3 could you update the nshare samples or provide information about system configuration / required packages / versions that results in testsuite pass?