GNU bug report logs - #19833
grep: internal PCRE error: -27 since updating from 2.16 to 2.21

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From: Oliver Freyermuth <o.freyermuth <at> googlemail.com>
To: 19833 <at> debbugs.gnu.org
Subject: bug#19833: grep: internal PCRE error: -27 since updating from 2.16 to 2.21
Date: Tue, 10 Feb 2015 22:59:38 +0100

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

Dear grep'pers,

since I updated from 2.16 to 2.21, several of my "check list of files
for bad filenames"-style grep expressions fail like this:
grep: internal PCRE error: -27
(one of the failing examples follows at the end of the mail, example
filename-list attached)

Researching this, I found that -27 is PCRE_ERROR_JIT_STACKLIMIT.
Apparently I exceed the 512 K JIT-stack-limit which is hardcoded in grep
with several of my regexps.

As using the JIT can not be turned off at runtime, nor can the stacksize
be controlled without patching + recompiling, this breaks previously
working expressions for me, so I consider this a new regression,
introduced with b06f7a29a58bbdd5866afc1e92dba3fdc9e2ed59 .

I tested that increasing the stack-size to 1 M fixes the problem for me.
A better fix could maybe consist of a better error message, allowing
stack-size control at runtime and / or making JIT optional at runtime.


Reproducer, using the attached file (which is generated by a find
command, of course - only 637 files with absolute paths in plain ASCII):
$ LANG=C grep -P -n '^([/](?!/)|[^/])*~/.*' pcrejit.txt
grep: internal PCRE error: -27


Cheers,
	Oliver

[pcrejit.txt (text/plain, attachment)]

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