This bug was fixed in the package meld - 3.18.0-6
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meld (3.18.0-6) unstable; urgency=medium
* Handle terminating diffing subprocesses to avoid severe memory leak
(LP: #1738296)
-- Balint Reczey Tue, 24 Apr 2018 12:58:18 +0200
** Changed in: meld
** Changed in: meld (Ubuntu)
Status: Triaged => Fix Committed
** Also affects: meld (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: meld (Ubuntu Artful)
Importance: Undecided => High
** Changed in: meld (Ubuntu Artful)
Status: New => Triaged
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You
** Tags added: patch-accepted-upstream
** Changed in: meld (Ubuntu)
Importance: Undecided => High
** Changed in: meld (Ubuntu)
Status: New => Triaged
** Changed in: meld (Ubuntu)
Milestone: None => ubuntu-18.04
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Looks like they moved repo to github. New links.
First bad commit (causes this bug).
https://github.com/GNOME/meld/commit/07ec4fd9b01d8efdf74cc268dc35aa4f5791c48b
#diff-0cf74878a4eeb2f48ed581806c8922a8
Patch that fixes bug.