memory allocation bug in bash 4.2.39(1)-release

[John Vincent]

I'm using bash 4.2.39(1)-release, part of Fedora release 17 (Beefy Miracle)
 
I find that if I enter the command:
 
echo {1..20000000}
 
it runs, but afterwards whenever I enter another command I get the error:
 
-bash: fork: Cannot allocate memory
 
I guess that the memory allocated to all those numbers on the echo command line 
is not freed properly.
 
Thanks,
John Vincent.