>> for(i in `{seq 1 $n}){echo fu>/dev/null&}
> If you can reproduce the "hang", can you run ps and see if
> the pid that rc is waiting for.
I can reproduce this quite easily, with n=150,
one time in three the script hangs.
Waitfor seems to be waiting for a proc which has already exited.
felix% acid 63541
/proc/63541/text:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: lstk()
await()+0x7 /sys/src/libc/9syscall/await.s:5
wait()+0x1b /sys/src/libc/9sys/wait.c:13
buf=0x35323536
fld=0xdfffcc04
l=0x33930
w=0x33938
Waitfor(pid=0xff7e)+0xb4 /sys/src/cmd/rc/plan9.c:210
w=0x33938
p=0x36538
errbuf=0x33b4c
Xbackq()+0x158 /sys/src/cmd/rc/havefork.c:120
wd=0x303531
ewd=0xdfffeeef
stop=0x1d958
pfd=0x5
f=0x33938
s=0xdfffceef
v=0x36538
c=0xa
pid=0xff7e
main(argc=0x1,argv=0xdfffefb4)+0x327 /sys/src/cmd/rc/exec.c:184
...
0xff7e == 65406
felix% ps
...
steve 63540 0:00 0:00 252K Await rc
steve 63541 0:00 0:00 252K Await rc
steve 63546 0:00 0:00 164K Pread stats
steve 63547 0:00 0:00 168K Pread stats
steve 63548 0:00 0:00 140K Pread clock
steve 63549 0:00 0:00 140K Sleep clock
steve 63550 0:00 0:00 376K Sleep faces
steve 63551 0:00 0:00 376K Pread faces
steve 63805 0:00 0:00 1116K Await rio
steve 63806 0:00 0:00 252K Await rc
steve 63807 0:00 0:00 124K Pread nedmail
steve 63960 0:00 0:00 1116K Await rio
steve 63961 0:00 0:00 252K Await rc
steve 65153 0:00 0:00 8K Sleep sleep
steve 65226 0:00 0:00 1116K Await rio
steve 65227 0:00 0:00 252K Await rc
steve 65228 0:00 0:00 228K Pread sam
steve 65229 0:00 0:00 320K Rendez samterm
steve 65230 0:00 0:00 320K Pread samterm
steve 65231 0:00 0:00 320K Pread samterm
steve 65232 0:00 0:00 320K Pread samterm
steve 65233 0:00 0:00 320K Pread samterm
steve 65251 0:00 0:00 1116K Await rio
steve 65252 0:00 0:00 252K Await rc
steve 65253 0:00 0:00 124K Pread nedmail
steve 65419 0:00 0:00 200K Pread ps
felix%
