mainThe GNU Bourne-Again SHell - Support: sr #110888, Pattern replacement substitution...


sr #110888: Pattern replacement substitution causes segfault

Submitter:  None
Submitted:  Sun 18 Jun 2023 09:11:32 AM UTC
Category:  None Priority:  5 - Normal
Severity:  3 - Normal Status:  Postponed
Privacy:  Public Assigned to:  None
Originator Email:  -email is unavailable- Open/Closed:  Open
Operating System:  GNU/Linux
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Mon 19 Jun 2023 05:04:23 PM UTC, comment #2: 

I see. It's a shame there's no solution, but thanks for this link. It explains some of the differences in performance I see between extglobs and regexes.

Mon 19 Jun 2023 04:22:12 PM UTC, comment #1: 

You've exceeded your stack size limit with the recursion needed to implement the +(pat) operator.

There was a discussion about this last year:

There's no good solution.

Chet Ramey <chet>
Group administrator
Sun 18 Jun 2023 09:11:32 AM UTC, original submission:  

Pattern substitutions with long matches (~80KiB) cause bash to crash with SIGSEGV. Here's an example that crashes on bash 5.2.15.

#!/usr/bin/env bash
shopt -s extglob

text=$(python3 -c 'print("a" * 1024 * 80)')
sub=${text//$pattern/}  # Segmentation fault
echo "${#sub}"



(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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    Date Changed by Updated Field Previous Value => Replaced by
    2023-06-19 chet StatusNone Postponed

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