GNU bug report logs - #44538
grep -E might exhaust stack space

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: JIang Yuancheng <0599jiangyc <at> gmail.com>
Cc: 44538 <at> debbugs.gnu.org, Kaihang Ji <kaihang <at> comp.nus.edu.sg>
Subject: bug#44538: grep -E might exhaust stack space
Date: Fri, 27 Aug 2021 18:25:44 -0700

[Message part 1 (text/plain, inline)]

On 11/9/20 9:34 AM, JIang Yuancheng wrote:
> grep -E “.*{10,}{10,}{10,}{10,}{10,}” can exhaust stack space then stack overflow comes out. (Tested on latest version 3.6)

This is a longstanding issue with the regex matcher. I installed the 
attached patch to document the issue better. Fortunately, the problem is 
mostly limited to contrived examples.

[0001-doc-document-interval-expression-limitations.patch (text/x-patch, attachment)]

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