Re: getgrouplist segfault?

[Anton Monroe <akm meer net>]

On Sat, Jul 02, 2005 at 03:56:53PM -0500, Anton Monroe wrote:
> The symptom is that when I try to start MC as root, it immediately gives
> a  segmentation fault.  When I start it as a normal user, it works.  The
> only  thing I can see that changed on January 30 is something called
> 'getgrouplist'. I don't know what that is.  Below is a complete diff
> between the version that works for me and the one that doesn't.  This is
> on a Linux machine; originally SuSE 7.3 but with updated versions of a
> lot of things.
> 
> Any ideas?  Any more information I should give you?

Pavel Tsekov told me how to do a backtrace.  Using cvs HEAD as of July 5,
I did
(as a normal user)
    ./autogen.sh CFLAGS="-g -O0" --prefix=/mc
    make
(as root)
    make install
    gdb /test/bin/mc | tee gdb.root.out

which produced this:

=================================================================
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GDB is free software, covered by the GNU General Public License, and you are
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Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-suse-linux"...
(gdb) r
Starting program: /mc/bin/mc 

Program received signal SIGSEGV, Segmentation fault.
0x4013bb29 in chunk_free () from /lib/libc.so.6
(gdb) bt full
#0  0x4013bb29 in chunk_free () from /lib/libc.so.6
No symbol table info available.
#1  0x4013b9a3 in free () from /lib/libc.so.6
No symbol table info available.
#2  0x4002efa3 in g_free () from /usr/lib/libglib-1.2.so.0
No symbol table info available.
#3  0x080906a7 in init_groups () at utilunix.c:107
	groups = (gid_t *) 0x8104f98
	ng = 7
	newgroups = (gid_t *) 0x8105020
	i = 135277456
	pwd = (struct passwd *) 0x401e9bd0
	grp = (struct group *) 0x401e9a88
#4  0x08076ff9 in main (argc=1, argv=0xbffff824) at main.c:2143
	show_change_notice = 0
#5  0x400e47ee in __libc_start_main () from /lib/libc.so.6
No symbol table info available.
(gdb) continue
Continuing.

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb) q
=================================================================
    
Hope it helps,

Anton