Return value from linux_execve syscall now lost due following changes
in rev. 1.46 src/sys/i386/linux/linux_machdep.c, and linux programs
fail when use execvp(3) and executed binary not in first path elemen
of $PATH :
[ snip ]
-       bsd.fname = args->path;
-       bsd.argv = args->argp;
-       bsd.envv = args->envp;
-       return (execve(td, &bsd));
+       error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE,
+           args->argp, args->envp);
+       free(newpath, M_TEMP);
+       if (error == 0)
+               kern_execve(td, &eargs, NULL);
+       exec_free_args(&eargs);
+       return (error);
 }
[ ...]

Fix: I'm use following patch locally :
How-To-Repeat: Prepped some garbage to $PATH and try to run various linux progs. (tar make=
 ...)