D58792.id183904.diff
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D58792.id183904.diff
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	diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
	--- a/sys/kern/uipc_usrreq.c
	+++ b/sys/kern/uipc_usrreq.c
	@@ -3114,8 +3114,15 @@
	* socket, it is the peer, so return success (or its error) with no
	* fallback; if not, it may be an O_PATH handle for a bound socket's
	* vnode, so fall through to an EMPTYPATH lookup.
	+ *
	+ * The descriptor-names-the-peer interpretation only applies to
	+ * connectat(2) with a real fd. connect(2) passes AT_FDCWD, and a
	+ * sockaddr whose sun_path begins with a NUL byte (e.g. a Linux
	+ * abstract namespace name passed through the linuxulator) must keep
	+ * failing the pathname lookup with ENOENT as it historically did,
	+ * so callers like libxcb fall back to the pathname socket.
	*/
	- if (*buf == '\0') {
	+ if (*buf == '\0' && fd != AT_FDCWD) {
	error = unp_socket_fd_peer(td, fd, so2p);
	if (error != ENOTSOCK)
	return (error);