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Subject:	RE: postinstall hang
Date:	Tue, 1 Apr 2008 09:47:22 -0400
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From:	"Popper, Samuel \(US SSA\)" <samuel DOT popper AT baesystems DOT com>
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> | $ NUM=1; while true ; do echo $NUM; NUM=$(( $NUM + 1 )); done
> |
> | will run indefinitely,
> 
> because it doesn't fork

Correct; that's what I was trying to demonstrate.

> | $ NUM=1; while true ; do echo `echo $NUM` ; NUM=$(( $NUM + 1 ));
done
> |
> | Hangs pretty quickly,
> 
> because it forks a huge number of processes, and each fork is likely
to be
> tripped up by a BLODA

As I understand it, that should fork once per iteration.

Running with cut-down PATH:

[samuel DOT popper AT localhost ~]$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin
[samuel DOT popper AT localhost ~]$ NUM=1; while true ; do echo `echo $NUM` ;
NUM=$(( $NUM + 1 )); done
1
2

Here, it hung after 2 iterations.  The default /etc/profile forks more
than that!

Other than sneaking in via PATH, the only moderately intrusive thing
running on the system is Sysinternal's ProcessExplorer.  But I tried
running with that closed, and it made no difference.

Is there anything else that could contribute to BLODA?

Thanks,

-Sam



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