Index: sys/compat/linux/linux_misc.c
===================================================================
--- sys/compat/linux/linux_misc.c
+++ sys/compat/linux/linux_misc.c
@@ -996,6 +996,17 @@
 }
 #endif
 
+
+
+/*
+ * Since 81338031 (switch linuxulator to use the native 1:1 threads)
+ * _WALL, _WCLONE flags are broken due to the fact that (to Linux kernel)
+ * no distinction between processes and threads - everything is runnable
+ * task. This allows do a weird things like waiting for a thread status
+ * change by wait() API, unlike FreeBSD where wait() is process intended
+ * only.
+ */
+
 static int
 linux_common_wait(struct thread *td, idtype_t idtype, int id, int *statusp,
     int options, void *rup, l_siginfo_t *infop)
@@ -2746,7 +2757,8 @@
 		*bsdopts |= WNOWAIT;
 
 	if (options & __WCLONE)
-		*bsdopts |= WLINUXCLONE;
+		LINUX_RATELIMIT_MSG_OPT1("unsupported _WCLONE, options(0x%x)",
+		    options);
 }
 
 int
Index: sys/kern/kern_exit.c
===================================================================
--- sys/kern/kern_exit.c
+++ sys/kern/kern_exit.c
@@ -1125,20 +1125,6 @@
 		return (0);
 	}
 
-	/*
-	 * This special case handles a kthread spawned by linux_clone
-	 * (see linux_misc.c).  The linux_wait4 and linux_waitpid
-	 * functions need to be able to distinguish between waiting
-	 * on a process and waiting on a thread.  It is a thread if
-	 * p_sigparent is not SIGCHLD, and the WLINUXCLONE option
-	 * signifies we want to wait for threads and not processes.
-	 */
-	if ((p->p_sigparent != SIGCHLD) ^
-	    ((options & WLINUXCLONE) != 0)) {
-		PROC_UNLOCK(p);
-		return (0);
-	}
-
 	if (siginfo != NULL) {
 		bzero(siginfo, sizeof(*siginfo));
 		siginfo->si_errno = 0;
@@ -1301,7 +1287,7 @@
 
 	/* If we don't know the option, just return. */
 	if ((options & ~(WUNTRACED | WNOHANG | WCONTINUED | WNOWAIT |
-	    WEXITED | WTRAPPED | WLINUXCLONE)) != 0)
+	    WEXITED | WTRAPPED)) != 0)
 		return (EINVAL);
 	if ((options & (WEXITED | WUNTRACED | WCONTINUED | WTRAPPED)) == 0) {
 		/*
Index: sys/sys/wait.h
===================================================================
--- sys/sys/wait.h
+++ sys/sys/wait.h
@@ -87,7 +87,7 @@
 				   a breakpoint. */
 
 #if __BSD_VISIBLE
-#define	WLINUXCLONE 0x80000000	/* Wait for kthread spawned from linux_clone. */
+#define	WLINUXCLONE 0x80000000	/* Not used anymore. */
 #endif
 
 #ifndef _IDTYPE_T_DECLARED