Bug in powerpc gdb?

[Roger Leigh <rleigh@whinlatter.ukfsn.org>]

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Hi folks,

I've come across some stack corruption when debugging a program with
gdb.  I thought this was a problem with my code, but it's (AFAICT)
verifiably correct, and shows no stack corruption on i386.  As a
result, I think this is a powerpc/gdb bug.

Please could someone try to reproduce this on their powerpc system?

Steps to reproduce:
1. Download testcase from
   http://www.whinlatter.ukfsn.org/gtk/uterm-stacks-0.1.0.tar.bz2
2. Configure with
   CC=c99 ./configure --prefix=/tmp/inst
3. make all install
4. cd utils
5. ./uterm-register [confirm the program runs OK]
6. Debug:

rleigh@hardknott:/tmp/uterm-stacks-0.1.0/utils$ gdb .libs/uterm-register
GNU gdb 6.3-debian
[...]
This GDB was configured as "powerpc-linux"...Using host libthread_db library "/lib/libthread_db.so.1".

(gdb) break main
Breakpoint 1 at 0x1000167c: file uterm-register.c, line 37.
(gdb) break uterm_control_register_module
Breakpoint 2 at 0x10011c8c
(gdb) run
Starting program: /tmp/uterm-stacks-0.1.0/utils/.libs/uterm-register
Breakpoint 2 at 0xffaf1a4: file uterm-control.c, line 142.

Breakpoint 1, main () at uterm-register.c:37
37        GModule *module = uterm_control_register_module("iso646-c0");
(gdb) bt
#0  main () at uterm-register.c:37
(gdb) c
Continuing.

Breakpoint 2, uterm_control_register_module (module=0x7ffffb20 "")
    at uterm-control.c:142
142       g_return_val_if_fail(module != NULL, NULL);
(gdb) bt
#0  uterm_control_register_module (module=0x7ffffb20 "")
    at uterm-control.c:142
#1  0x0ffaf19c in uterm_control_register_module (module=0x7ffffb20 "")
    at uterm-control.c:141
#2  0x0ffaf19c in uterm_control_register_module (module=0x7ffffb20 "")
    at uterm-control.c:141
#3  0x0ffaf19c in uterm_control_register_module (module=0x7ffffb20 "")
    at uterm-control.c:141
Previous frame inner to this frame (corrupt stack?)

I'm fairly certain this is bogus.  This is current Debian unstable,
with Linux 2.6.11.8.


Regards,
Roger

- -- 
Roger Leigh
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