Bug 218563

Summary:	The kernel modules have bogus addresses for text (code) section
Product:	[Fedora] Fedora	Reporter:	William Cohen <wcohen>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4	CC:	levon, wtogami
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	2.6.19-1.2895.fc6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-01-22 14:58:39 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:

Description William Cohen 2006-12-06 01:40:51 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.13) Gecko/20060418 Fedora/1.0.8-1.1.fc4 Firefox/1.0.8

Description of problem:
The text address in the kernel modules for symbols in the modules appear to be incorrect:

$ nm /lib/modules/2.6.17-1.2142_FC4/kernel/arch/x86_64/oprofile/oprofile.ko|grep ' T '
0000000000000000 T add_event_entry
0000000000000000 T alloc_cpu_buffers
0000000000000000 T alloc_event_buffer
0000000000000000 T cleanup_module
0000000000000000 T cpu_buffer_reset
0000000000000000 T end_cpu_work
...

OProfile uses that information to determine which function a sample maps to. 
It looks like the build system might be corrupting the offsets. This problem does not appear in locally build kernel RPM or kernel code.


Version-Release number of selected component (if applicable):
kernel-2.6.17-1.2142_FC4 oprofile-0.8.2-4

How reproducible:
Always


Steps to Reproduce:
1. Examine the various modules with "nm $path_to_module |grep ' T '"


Actual Results:
See that all the addresses in module are 0000000000000000


Expected Results:
See the offsets for the various functions in the module.

Additional info:

Comment 1 Christian Iseli 2007-01-22 10:09:34 UTC

This report targets the FC3 or FC4 products, which have now been EOL'd.

Could you please check that it still applies to a current Fedora release, and
either update the target product or close it ?

Thanks.

Comment 2 William Cohen 2007-01-22 14:58:39 UTC

For Rawhide looks okay:

$ nm /lib/modules/`uname -r`/kernel/arch/x86_64/oprofile/oprofile.ko|grep ' T '
0000000000000ee4 T add_event_entry
00000000000005d8 T alloc_cpu_buffers
0000000000000e38 T alloc_event_buffer
0000000000000000 T cleanup_module
00000000000001b8 T cpu_buffer_reset

Also looks okay for FC6:

$ nm /lib/modules/`uname -r`/kernel/arch/x86_64/oprofile/oprofile.ko|grep ' T '
0000000000001023 T add_event_entry
0000000000000662 T alloc_cpu_buffers
0000000000000f78 T alloc_event_buffer
0000000000000000 T cleanup_module
0000000000000230 T cpu_buffer_reset
000000000000053f T end_cpu_work