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Bug 227231

Summary: libdwfl dwfl_module_addrname can't find symbol name for symbols with st_size=0.
Product: Red Hat Enterprise Linux 5 Reporter: Roland McGrath <roland>
Component: elfutilsAssignee: Roland McGrath <roland>
Status: CLOSED ERRATA QA Contact: David Lawrence <dkl>
Severity: medium Docs Contact:
Priority: medium    
Version: 5.0CC: drepper, ebachalo
Target Milestone: ---Keywords: Reopened
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: 0.126 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-04-15 10:13:58 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 227167    
Bug Blocks: 173278    

Description Roland McGrath 2007-02-03 19:41:04 UTC
+++ This bug was initially created as a clone of Bug #227167 +++

Description of problem:
calling dwfl_module_addrname on a symbol with a st_size of 0 returns null when
it should return the symbol size.

Version-Release number of selected component (if applicable):
0.125

How reproducible:
always.

Steps to Reproduce:
1. Create assembly test with code for a function with no symbol size. That
segfaults.
2. Run the program and try to get a backtrace using dwfl_module_addrname.
  
Actual results:
Get null.

Expected results:
Get foo().

Additional info:
Check out the patch for a possible solution.

-- Additional comment from npremji@redhat.com on 2007-02-02 16:30 EST --
Created an attachment (id=147253)
Patch to implement finding addrname of functions with st_size=0.


-- Additional comment from npremji@redhat.com on 2007-02-02 16:32 EST --
Created an attachment (id=147254)
A program with a function foo with st_size = 0, that segfaults in foo.


-- Additional comment from roland@redhat.com on 2007-02-03 14:39 EST --
I've done a different fix.

Comment 2 RHEL Product and Program Management 2007-06-05 20:38:23 UTC
This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Since this
bugzilla is in a component that is not approved for the current
release, it has been closed with resolution deferred.  You may
reopen this bugzilla for consideration in the next release.

Comment 6 Roland McGrath 2009-04-15 10:13:58 UTC
This was fixed in 5.3 (-0.137-3.el5)