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

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: arnold <at> skeeve.com, santiagorr <at> riseup.net, jim <at> meyering.net
Cc: 22793 <at> debbugs.gnu.org, 186568 <at> bugs.debian.org, 21513 <at> debbugs.gnu.org
Subject: bug#22793: grep -E assertion failure with back references
Date: Thu, 25 Feb 2016 00:01:52 -0800

arnold <at> skeeve.com wrote:
> Paul Eggert <eggert <at> cs.ucla.edu> wrote:
>
>> With recent 'grep' you can work around the problem by configuring
>> --with-included-regex.
>
> Not so. I did a fresh
>
> 	./boostrap
> 	./configure --with-included-regex
> 	make
>
> and it still core dumps:
>
> $ echo abc | ./src/grep -E  '(.*)(.*)(.*)\3\2\1'
> grep: regexec.c:1413: pop_fail_stack: Assertion `((Idx) (num) < ((Idx) -2))' failed.
> Aborted (core dumped)
>
> I looked at it in a debugger fs->num before the --fs->num executes looks to
> be -1.

Sorry, you're right. I got confused into thinking that grep Bug#22793 and grep 
Bug#21513 are the same bugs, but they're not. I have unmerged them.

This is still a glibc bug, not a grep bug; it's just that we don't have a fix.

grep Bug#21513 is indeed fixed by configuring --with-included-regex.

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