dash race

[Alexey Gladkov <gladkov.alexey@gmail.com>]

Greetings!

Sometimes following script is get 99% CPU and will be never
finished. This happens with dash from git. I can't bisect
this because 05c1076 has this problem.

<================================
#!/bin/dash
trap "echo TRAP" USR1
stub() {
	echo ">>> STUB $1" >&2
	sleep $1
	echo "<<< STUB $1" >&2
	kill -USR1 $$
}
stub 3 &
stub 2 &
until { echo "###"; wait; } do
	echo "*** $?"
done
================================>

strace:
12541 wait4(-1, 0xaf87aca0, 0, NULL)    = -1 ECHILD (No child processes)
12541 wait4(-1, 0xaf87aca0, 0, NULL)    = -1 ECHILD (No child processes)
12541 wait4(-1, 0xaf87aca0, 0, NULL)    = -1 ECHILD (No child processes)

-- 
Rgrds, legion