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Bug 614806

Summary:	prelink shifts .bss address by .dynbss breaking gdb
Product:	Red Hat Enterprise Linux 5	Reporter:	Jan Kratochvil <jan.kratochvil>
Component:	gdb	Assignee:	Jan Kratochvil <jan.kratochvil>
Status:	CLOSED ERRATA	QA Contact:	qe-baseos-tools-bugs
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.5	CC:	ebachalo, pmuller
Target Milestone:	rc	Keywords:	Regression
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	gdb-7.0.1-27.el5	Doc Type:	Bug Fix
Doc Text:	GDB displayed invalid content of some variables. Separate debuginfo files installed for executables caused this behavior when the prelink program optimized the executable with copy relocations. With this update, GDB correctly displays the contents of all the variables.	Story Points:	---
Clone Of:	614659
Clones:	614808 (view as bug list)		Environment:
Last Closed:	2011-01-13 23:55:01 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	614659
Bug Blocks:	614808

Description Jan Kratochvil 2010-07-15 10:05:20 UTC

+++ This bug was initially created as a clone of Bug #614659 +++

there is a regression since gdb-7.0 for a combination of:
 * prelinked
 * main executable
 * using separate debug info
 * using copy relocations

Hopefully it may not affect customer applications but it makes debugging of the RHEL components difficult:

int bssvar, *bssvarp = &bssvar;

(gdb) p &bssvar
$1 = (int *) 0x600b54
(gdb) p bssvarp
$2 = (int *) 0x600b50

Version-Release number of selected component (if applicable):
FAIL gdb-7.1-28.fc13.x86_64
FAIL gdb-7.0.1-24.el5
PASS <= FSF GDB 7.0
FAIL >= FSF GDB 7.1

How reproducible:
Always.

Steps to Reproduce:
Updated gdb.base/prelink.exp testcase.

Fix + testcase:
http://sourceware.org/ml/gdb-patches/2010-07/msg00237.html

Comment 3 Jan Kratochvil 2010-09-06 18:43:22 UTC

* Mon Sep  6 2010 Jan Kratochvil <jan.kratochvil> - 7.0.1-27.el5
- Fix prelinked executables with sepdebug and copy relocations (BZ 614806).
  - Fix incorrect relocation of sections with duplicate name (BZ 575737).
  - Fix false warning: section .gnu.liblist not found in ...

Comment 7 Eva Kopalova 2010-11-16 17:14:23 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
GDB displayed invalid content of some variables. Separate debuginfo files installed for executables caused this behavior when the prelink program optimized the executable with copy relocations. With this update, GDB correctly displays the contents of all the variables.

Comment 9 errata-xmlrpc 2011-01-13 23:55:01 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-2011-0099.html