GNU bug report logs - #22793
grep -E assertion failure with back references

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From: santiagorr <at> riseup.net
To: 22793 <at> debbugs.gnu.org
Subject: bug#22793: grep -E assertion failure with back references
Date: Wed, 24 Feb 2016 17:18:54 +0100

Hi,

This is a long standing bug reported to Debian, still present in 2.23.
It was forwarded at some point, but I cannot find any reference, so I'm
reforwarding it.

% echo abc | LANG=C grep -E '(.*)(.*)(.*)\3\2\1'
grep: regexec.c:1401: pop_fail_stack: Assertion `num >= 0' failed.

More info at: https://bugs.debian.org/186568

Regards,

Santiago

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