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Severe memleak in sequence expressions?

From: Marc Schiffbauer
Subject: Severe memleak in sequence expressions?
Date: Wed, 30 Nov 2011 13:33:15 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Hi all,

I think there is a severe memleak in bash.

I had this effect with bash 4.2.10 (Ubuntu Linux) as well as 
bash 4.1.9 on Gentoo Linux.

To make it short:

echo {0..10000000}>/dev/null

This makes my system starting to swap as bash will allocate several GiB of

If I choose a way bigger number bash "just" seems to crash:

address@hidden ~ $ echo {1..1000000000000000000}>/dev/null
bash: xmalloc: cannot allocate 11892949016 bytes (135168 bytes allocated)
address@hidden ~ $

Is this a bug?

Please do not try this on a productive machine!

8AAC 5F46 83B4 DB70 8317  3723 296C 6CCA 35A6 4134

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