Bug 440258

Summary: grep-mem-exhausted.patch introduces regressions
Product: Red Hat Enterprise Linux 4 Reporter: Simon Vallet <svallet>
Component: grepAssignee: Stepan Kasal <kasal>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: low    
Version: 4.5CC: rvokal
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 481765 (view as bug list) Environment:
Last Closed: 2009-05-18 20:34:42 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Simon Vallet 2008-04-02 14:54:49 UTC 
Description of problem:

grep-2.5.2-32.3 from RHEL 4.5 seems to fail on large files :

$ grep '12884102-12884161_12884190-12884243;9,5;28' /env/cns/tmp/test_file
$

$ tail /env/cns/tmp/test_file > /env/cns/tmp/test_file.tail
$ grep '12884102-12884161_12884190-12884243;9,5;28' /env/cns/tmp/test_file.tail 
../lecures_NM_eland_result.seq-15290226 TGGGGGAGGGTTTTTTGTTTTATAAAGATGATC [...]
$

It appears this behaviour has been introduced by the grep-mem-exhausted.patch --
the problem disappears if we rebuild an RPM without this patch.

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

grep-2.5.2-32.3

How reproducible:

always

Steps to Reproduce:
1. wget http://www.genoscope.cns.fr/externe/test_file (warning: 1gb)
2. grep '12884102-12884161_12884190-12884243;9,5;28' /env/cns/tmp/test_file
  
Actual results:

No output

Expected results:

The last line of this file contains the pattern (see above)

Additional info:

Re-building without patch #9 (grep-mem-exhausted.patch) solves the problem
Comment 3 Stepan Kasal 2009-01-27 16:02:45 UTC 
Please note that grep-mem-exhausted.patch was introduced to fix bug #198167.
Though the patch might actually get removed on future releases of RHEL, I decided to keep a modified version in RHEL 4 updates: when the buffer limit (200MB) is reached, grep bails out with a message "line too long".

Keep in mind that grep is a tool for processing text files; it is not suited to search arbitrary data.
Comment 4 Stepan Kasal 2009-01-30 08:35:09 UTC 
Fedora rawhide clone: bug 481765
RHEL 5 clone: bug 483073
Comment 7 errata-xmlrpc 2009-05-18 20:34:42 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2009-1019.html