[Bug libc/794] New: Segfault with LD_DEBUG=ALL

[Bug libc/794] New: Segfault with LD_DEBUG=ALL

[paul at codesourcery dot com]

I'm getting a segfault when setting LD_DEBUG=all
The segfault occurs because we end up doing something equivalent to 
_dl_debug_printf("%s", NULL);

I't quite possible that this is a bug elsewhere, but given this routine is
specifically for debugging purposes it sems sensible to make it robust to
unusual input.

-- 
           Summary: Segfault with LD_DEBUG=ALL
           Product: glibc
           Version: 2.3.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: paul at codesourcery dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: arm-none-linux-gnueabi


http://sources.redhat.com/bugzilla/show_bug.cgi?id=794

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[Bug libc/794] Segfault with LD_DEBUG=ALL

[paul at codesourcery dot com]

------- Additional Comments From paul at codesourcery dot com  2005-03-17 14:34 -------
Created an attachment (id=438)
 --> (http://sources.redhat.com/bugzilla/attachment.cgi?id=438&action=view)
Patch to fix bug

Fixes bug by printing "(null)" as appropriate, like normal printf does.

-- 


http://sources.redhat.com/bugzilla/show_bug.cgi?id=794

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[Bug libc/794] Segfault with LD_DEBUG=ALL

[roland at gnu dot org]

------- Additional Comments From roland at gnu dot org  2005-03-17 21:09 -------
This report lacks a test case.  If this is an arm-specific problem, please
figure out whether it happens only in some arm-specific code.  

Note that Target is a meaningless field for libc.
If you want to indicate the platform of interest, that's Host.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING


http://sources.redhat.com/bugzilla/show_bug.cgi?id=794

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[Bug libc/794] Segfault with LD_DEBUG=ALL

[paul at codesourcery dot com]

------- Additional Comments From paul at codesourcery dot com  2005-03-18 03:40 -------
This happened with an internal modified version of glibc, and only      
occurred because another bit of glibc was broken.   
   
However tracking down that bug would probably have been easier if     
_dl_debug_printf didn't segfault.  Tracking back a fault is much easier when 
you can see the debug output going wrong, rather than trying to deal with 
segfaults on a target without a working gdb. 
   
The issue is not specific to a particular target. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
 GCC target triplet|arm-none-linux-gnueabi      |


http://sources.redhat.com/bugzilla/show_bug.cgi?id=794

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[Bug libc/794] Segfault with LD_DEBUG=ALL

[gotom at debian dot or dot jp]

------- Additional Comments From gotom at debian dot or dot jp  2005-03-20 02:06 -------
In most case, passing NULL to _dl_debug_printf("%s") is glibc's bug.
It's small improvement for such a special case.  Committers,
please judge to put it or not.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|gotom at debian dot or dot  |roland at gnu dot org
                   |jp                          |
             Status|NEW                         |ASSIGNED


http://sources.redhat.com/bugzilla/show_bug.cgi?id=794

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[Bug libc/794] Segfault with LD_DEBUG=ALL

[roland at gnu dot org]

------- Additional Comments From roland at gnu dot org  2005-03-20 06:39 -------
I don't think it's warranted.  It seems as likely to mask a bug as to make
debugging easier.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |WONTFIX


http://sources.redhat.com/bugzilla/show_bug.cgi?id=794

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