From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <9ad68ddb26c79d699d261fdf5fbdc505@coraid.com>
From: erik quanstrom <quanstro@coraid.com>
Date: Fri, 15 Dec 2006 18:08:39 -0500
To: 9fans@cse.psu.edu
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Subject: [9fans] wait race?
Topicbox-Message-UUID: f4f2be5c-ead1-11e9-9d60-3106f5b1d025

this command frequently hangs on my terminal
	for(i in `{seq 1 $n}){echo fu>/dev/null&}

i've tried n=50 and n=150.  

acid says the shell is doing this

acid: lstk()
await()+0x7 /sys/src/libc/9syscall/await.s:5
wait()+0x1b /sys/src/libc/9sys/wait.c:13
	buf=0x36373031
	fld=0xdfffcc04
	l=0x35188
	w=0x35190
Waitfor(pid=0x2ae1)+0xb4 /usr/quanstro/src/rc/plan9.c:211
	w=0x35190
	p=0x36e70
	errbuf=0x353a4
Xbackq()+0x158 /usr/quanstro/src/rc/havefork.c:120
	wd=0x303531
	ewd=0xdfffeeef
	stop=0x1dd10
	pfd=0x5
	f=0x35190
	s=0xdfffceef
	v=0x36e70
	c=0xa
	pid=0x2ae1
main(argc=0x1,argv=0xdfffefb4)+0x327 /usr/quanstro/src/rc/exec.c:184
	rcmain=0x1642c
	num=0x35343031
	bootstrap=0x2
	i=0x0
_main+0x31 /sys/src/libc/386/main9.s:16

is this a race, or am i missing something?  (p9p rc does not
hang doing the same thing.)

- erik