llvm-project

13cee9be - [sanitizer] Fix race condition in GetNamedMappingFd with decorate_pro… (#190981)

[sanitizer] Fix race condition in GetNamedMappingFd with decorate_pro… (#190981) …c_maps=1 Multi-threaded programs crash randomly when ASAN_OPTIONS=decorate_proc_maps=1 is enabled due to filename collision in /dev/shm. Root Cause: All threads use the same filename format '/dev/shm/<PID> [name]', causing race conditions where one thread deletes a file created by another thread, resulting in ENOENT errors. Solution: Add thread ID (TID) to the filename to ensure uniqueness: - Old format: /dev/shm/<PID> [name] - New format: /dev/shm/<PID>.<TID> [name] This ensures each thread has a unique filename, eliminating the race condition. Testing: - Original version: 30% crash rate (6 crashes in 20 runs) - Fixed version: 0% crash rate (0 crashes in 50 runs) Fixes #190604