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Bug 440258 - grep-mem-exhausted.patch introduces regressions
grep-mem-exhausted.patch introduces regressions
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: grep (Show other bugs)
x86_64 Linux
low Severity medium
: rc
: ---
Assigned To: Stepan Kasal
Depends On:
  Show dependency treegraph
Reported: 2008-04-02 10:54 EDT by Simon Vallet
Modified: 2018-09-18 10:04 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 481765 (view as bug list)
Last Closed: 2009-05-18 16:34:42 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2009:1019 normal SHIPPED_LIVE grep bug fix update 2009-05-18 10:30:16 EDT

  None (edit)
Description Simon Vallet 2008-04-02 10:54:49 EDT
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):


How reproducible:


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 11:02:45 EST
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 03:35:09 EST
Fedora rawhide clone: bug 481765
RHEL 5 clone: bug 483073
Comment 7 errata-xmlrpc 2009-05-18 16:34:42 EDT
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.


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