Hi all, Random SWE here. I've found a bug in the LinuxSocketOptions.c native implementation of getting/setting quickack on a socket. When running strace, the socket option that is set is actually changing the SO_PRIORITY.
This is because the syscall is incorrectly called with level=SO_SOCKET rather than level=SOL_TCP. You can see this in the openjdk implementation on line 92 and 105: https://github.com/openjdk/jdk/blob/a08c5cb3f1be7a20c8f955951d1605bb8b1c1aa4/src/jdk.net/linux/native/libextnet/LinuxSocketOptions.c#L92. It has existed since the original implementation in JDK-8145635. I believe the fix is to change both get/set syscalls like this: setsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &optval, sizeof (optval)); to setsockopt(fd, SOL_TCP, TCP_QUICKACK, &optval, sizeof (optval)); The bug has existed since JDK 10 and I see it still exists in the most recent versions of Java. It was found and tested in JDK 11. As a non-contributor, I don't know of a way of submitting a patch or directly reporting this bug. Can someone provide guidance on where to take it from here? Thank you, Bruno Da Silva
