[Opensync-users] opensync on x86_64

[Roland S. <ro...@xi...>]

Hi,

i tried opensync on an amd64 system. It dies with a segfault=20
in osync_member_initialize when the initialize function of the
plugin is called.
I tried this with gcc-3.2 -3.3 and -4.0 and always got the same=20
result. I don't know how to track this. It seems to me, that the=20
stack gets somehow overwritten during the call to fs_initialize,=20
but this is only a guess.

btw. compiling with -Werror fails because casting void* to int=20
gives a warning on x86_64.
opensync_debug.c:65: warning: cast from pointer to integer of different siz=
e


This is a run of msynctool --sync filefile in gdb

roland@alderaan:~/opensync$ gdb ./bin/msynctool
GNU gdb 6.3-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-linux"...Using host libthread_db library=
 "/lib/libthread_db.so.1".

(gdb) break opensync_member.c:982
No source file named opensync_member.c.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (opensync_member.c:982) pending.
(gdb) run --sync filefile
Starting program: /home/roland/opensync/bin/msynctool --sync filefile
[Thread debugging using libthread_db enabled]
[New Thread 46912515451632 (LWP 32346)]
Breakpoint 2 at 0x2aaaaad56f94: file opensync_member.c, line 982.
Pending breakpoint "opensync_member.c:982" resolved
Synchronizing group "filefile"
The previous synchronization was unlean. Slow-syncing
[Switching to Thread 46912515451632 (LWP 32346)]

Breakpoint 2, osync_member_initialize (member=3D0x515750, error=3D0x7fffffc=
fb538)
    at opensync_member.c:982
982             if (!(member->plugindata =3D functions.initialize(member, e=
rror))) {
(gdb) print *member
$1 =3D {id =3D 1, configdir =3D 0x5157e0 "/home/roland/.opensync/group1/1",
  configdata =3D 0x0, configsize =3D 0, plugin =3D 0x50a2e0,
  memberfunctions =3D 0x5156f0, group =3D 0x506740, enginedata =3D 0x512a70=
,
  plugindata =3D 0x0, format_sinks =3D 0x50a170, objtype_sinks =3D 0x50a140=
,
  pluginname =3D 0x517760 "file-sync", accepted_objtypes =3D 0x0, filters =
=3D 0x0,
  extension =3D 0x0, loop =3D 0x512b80}
(gdb) s
fs_initialize (member=3D0x7fffffcfb538, error=3D0x7fffffcfb538) at file_syn=
c.c:66
66      {
(gdb) print *member
$2 =3D {id =3D 0, configdir =3D 0x0, configdata =3D 0x0, configsize =3D 0, =
plugin =3D 0x0,
  memberfunctions =3D 0x0, group =3D 0x0, enginedata =3D 0x0, plugindata =
=3D 0x0,
  format_sinks =3D 0x0, objtype_sinks =3D 0x0, pluginname =3D 0x0,
  accepted_objtypes =3D 0x0, filters =3D 0x0, extension =3D 0x0, loop =3D 0=
x0}
(gdb) finish
Run till exit from #0  fs_initialize (member=3D0x7fffffcfb538,
    error=3D0x7fffffcfb538) at file_sync.c:66
0x00002aaaaad56f9c in osync_member_initialize (member=3D0x0,
    error=3D0x7fffffcfb538) at opensync_member.c:982
982             if (!(member->plugindata =3D functions.initialize(member, e=
rror))) {
Value returned is $3 =3D (void *) 0x517670
(gdb) print *member
Cannot access memory at address 0x0
(gdb) n

Program received signal SIGSEGV, Segmentation fault.
0x00002aaaaad56f9f in osync_member_initialize (member=3D0x0,
    error=3D0x7fffffcfb538) at opensync_member.c:982
982             if (!(member->plugindata =3D functions.initialize(member, e=
rror))) {
(gdb)


Roland