Jamie Guinan writes:

It looks like latest uClibc defines ARCH_HAS_MMU, but a few busybox files
test UCLIBC_HAS_MMU, resulting in vfork() getting called instead of
fork(), etc.

Patch below.   Only tested for lash.

Cheers,
-Jamie

shell/lash.c

@@ -1380,7 +1380,7 @@ static int run_command(struct job *newjob, int inbg, int outpipe[2])
 			}
 		}
 
-#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
+#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
 		if (!(child->pid = fork()))
 #else
 		if (!(child->pid = vfork()))