Here are a couple of examples where a c test hang but hang analyzer didn't produce any useful result:

• https://spruce.mongodb.com/task/wiredtiger_ubuntu2004_release_arm64_spinlock_pthread_adaptive_test_21a339fdc93fb673ef0d220966b3912743e2094d_25_01_21_05_49_26/logs?execution=0
• https://evergreen.mongodb.com/task/wiredtiger_ubuntu2004_release_arm64_configure_combinations_21a339fdc93fb673ef0d220966b3912743e2094d_25_01_21_05_49_26