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This pattern is similar to No Component Symbols (Volume 1, page 298) memory analysis pattern:
# Module PID TID Time Message 21372 \src\dllA 2968 5476 3:55:10.004 Calling foo() 21373 Unknown 2968 5476 3:55:10.004 ????? Unknown( 27): GUID=1EF56EBD- A7FC-4892-8DBA-00AD813F8A24 (No Format Information found). 21374 Unknown 2968 5476 3:55:10.004 ????? Unknown( 27): GUID=1EF56EBD- A7FC-4892-8DBA-00AD813F8A24 (No Format Information found). 21375 Unknown 2968 5476 3:55:10.004 ????? Unknown( 27): GUID=1EF56EBD- A7FC-4892-8DBA-00AD813F8A24 (No Format Information found). 21376 Unknown 2968 5476 3:55:10.004 ????? Unknown( 28): GUID=1EF56EBD- A7FC-4892-8DBA-00AD813F8A24 (No Format Information found). 21377 Unknown 2968 5476 3:55:10.004 ????? Unknown( 23): GUID=1EF56EBD- A7FC-4892-8DBA-00AD813F8A24 (No Format Information found). 21378 \src\dllA 2968 5476 3:55:10.004 Calling bar()