Apple macOS 10.14.5 iOS 12.3 XNU - in6_pcbdetach Stale Pointer Use-After-Free

Apple macOS 10.14.5 iOS 12.3 XNU - in6pcbdetach Stale Pointer Use-After-Free Reproduction Repros on 10.14.3 when run as root. It may need multiple tries to trigger. $ clang -o in6selectsrc in6selectsrc.cc $ while 1; do sudo ./in6selectsrc; done res0: 3 res1: 0 res1.5: -1 // failure expected here...