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1.3.15 - with long command line, command hangs + thrashes. nt4 (?bash/tcsh)

A while ago I posted a weird bug; it's something I can work around but I
figured that I should write up a better description. I don't see this bug on
every machine I use, which makes it especially puzzling. 

On NT4, I see the following: I find that once a command line exceeds a
certain number of characters, and I call an external program, things get
stuck. I don't observe the same thing on my w2k laptop. 

For example:

$
LONGARG=11111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
111111111111111111111111111111111111111111111111111111111

$ echo $LONGARG

works fine, which seems to use a built-in "echo" command, but

$ /usr/bin/echo $LONGARG

hangs. In the process viewer, it keeps using more and more memory.
Eventually the system falls down. If I shorten "LONGARG", it doesn't hang.
When I strace the hanging process all I get is 

$ strace -p 378
Attached to pid 378 (windows pid 378)
   13      13 [sig] bash 378! wait_sig: looping

I note the same situation in bash and tcsh. 

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