Hi Quan, Thanks for testing the patch! I'm glad it resolves the startup crash. > I tested this patch. postgres -V no longer crashes.
Regarding the shutdown issue - I tested extensively with ThreadSanitizer enabled using both build configurations I mentioned earlier, and all shutdown modes work correctly in my environment: > There is a minor issue. I'm not sure if it's caused by this patch. > The database can only be shut down using the immediate mode. Fast shutdown: 2025-09-15 20:20:07.454 IST [28229] LOG: received fast shutdown request [...] 2025-09-15 20:20:07.574 IST [28229] LOG: database system is shut down Smart shutdown: 2025-09-15 20:28:14.271 IST [31263] LOG: received smart shutdown request [...] 2025-09-15 20:28:14.399 IST [31263] LOG: database system is shut down All modes complete within seconds with the final "database system is shut down" message, unlike the hang you're experiencing. The patch only moves __ubsan_default_options() to a separate compilation unit to avoid TSan initialization issues during startup. It doesn't modify any shutdown logic or signal handling code. My Environment: Ubuntu 24.04.1, clang 18, PostgreSQL 17.2. Best regards, Emmanuel
