Bug 161896

Summary: Grep "Segmentation fault" using Perl regular expression
Product: [Fedora] Fedora Reporter: Robert Jackson <bugzilla>
Component: grepAssignee: Tim Waugh <twaugh>
Status: CLOSED DUPLICATE QA Contact: Mike McLean <mikem>
Severity: low Docs Contact:
Priority: medium    
Version: 3   
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2005-06-28 09:36:29 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Robert Jackson 2005-06-28 09:35:17 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050416 Fedora/1.0.3-1.3.1 Firefox/1.0.3

Description of problem:
I was using grep with a Perl regular expression to find files containing blank lines, but with some whitespace (i.e. a tab or a space).

One file (from about 20) caused grep to Segmentation fault.  This file was unique from the others since the last line was empty (i.e. it has an additional newline at the end).

I found that creating a file with a single newline caused the same Segmentation fault.

Version-Release number of selected component (if applicable):
grep-2.5.1-7.8

How reproducible:
Always

Steps to Reproduce:
1. echo "\n" > temp.txt
2. grep -P '^\s+$' temp.txt


Actual Results:  Segmentation fault

Expected Results:  No Segmentation fault


Additional info:

I tried the same command on serveral different Ferdora platforms, and all give the same Segmentation fault.  Specifically:

RedHat Linux 9 (i686)
Fedora Core 1 (i686)
Fedora Core 3 (i686)
Fedora Core 3 (x86_64)
Comment 1 Tim Waugh 2005-06-28 09:36:29 UTC 
You keep resubmitting this: don't.

*** This bug has been marked as a duplicate of 157964 ***
Comment 2 Robert Jackson 2005-06-28 09:46:13 UTC 
I'm ever so sorry.  I thought I had a firefox bookmark set up to view the
original bug report, but unfortunately clicking the bookmark actually
resubmitted the bug.