`src/rawposix/src/fs_calls.rs:1108-1110` A read lock on vmmap is acquired and immediately dropped without reading it. The munmap path should validate that the region exists before unmapping.
src/rawposix/src/fs_calls.rs:1108-1110A read lock on vmmap is acquired and immediately dropped without reading it. The munmap path should validate that the region exists before unmapping.