The ipc multiplexer syscall on x86 currently returns EINVAL for a non-existing sub-opcode. This logical but is a problem with the introduction of new operations (like semtimedop). Now EINVAL can mean "no such operation" and "invalid parameter". To avoid such problems in future, could you apply the attached patch? -- --------------. ,-. 444 Castro Street Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA Red Hat `--' drepper at redhat.com `---------------------------