tmpfs returns incorrect data on concurrent pread() and truncate()tmpfs returns incorrect data on concurrent pread() and truncate() tmpfs seems to be incorrectly returning 0-bytes when reading from a file that is concurrently being truncated. This is causing crashes in gocryptfs, a cryptographic FUSE overlay, when it reads a nonce from disk that should absolutely positively never be all-zero. I have written a reproducer in C that triggers this issue on both boxe
