Fail to load shared objects on AIX

[Heinrich Mislik]

On 15 Jan 2008 at 22:47, Volker Lendecke wrote:

> Probing module
> '/home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so'
> Error loading module
> '/home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so':
> rtld: 0712-001 Symbol _talloc_realloc_array was referenced
>       from module
> /home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so(), but
> a runtime definition
>       of the symbol was not found.
> rtld: 0712-001 Symbol _talloc_array was referenced
>       from module
> /home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so(), but
> a runtime definition
>       of the symbol was not found.
> rtld: 0712-001 Symbol _talloc_zero was referenced
>       from module
> /home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so(), but
> a runtime definition
>       of the symbol was not found.
> Can't find a vfs module
> [/home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so]
> smbd_vfs_init: vfs_init_custom failed for
> /home/build/build_farm/samba_3_2_test/source/bin/xattr_tdb.so
> 
> when trying to connect the tmp share defined in server.conf
> of the build farm scripts. When looking at "nm bin/smbd",
> it says:
> 
> ._talloc_realloc     T   268559344
> ._talloc_realloc_array T   268554040
> ._talloc_realloc_array at AF90_40 t   268579484
> 
> Similarly for the other symbols.

Always use dump -Tv on AIX to get the true story. Depending on your 
object_mode
the -X32 or -X64 flag my be required.

As an example:

dump -Tv -X64 lib/vfs/readonly.so

gives

lib/vfs/readonly.so:

                        ***Loader Section***

                        ***Loader Symbol Table Information***
[Index]      Value      Scn     IMEX Sclass   Type           IMPid 
Name

[0]     0x00000000    undef      IMP     RW EXTref libc.a(shr_64.o) 
errno
[1]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
__mod_init
[2]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
exit
[3]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
strlen
[4]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
abort
[5]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
time
[6]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
strncmp
[7]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
isspace
[8]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
islower
[9]     0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
toupper
[10]    0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
localtime
[11]    0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
gmtime
[12]    0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
mktime
[13]    0x00000000    undef      IMP     DS EXTref libc.a(shr_64.o) 
isalpha
[14]    0x00000000    undef      IMP     RW EXTref libc.a(shr_64.o) 
__n_pthreads
[15]    0x00000000    undef      IMP     RW EXTref libc.a(shr_64.o) 
__malloc_user_defined_name
[16]    0x00000000    undef      IMP     RW EXTref libc.a(shr_64.o) 
__crt0v
[17]    0x1100013f0    .data    ENTpt     DS SECdef        [noIMid] 
__start
[18]    0x110001400    .data      EXP     DS SECdef        [noIMid] 
init_module
[19]    0x110001430    .data      EXP     DS SECdef        [noIMid] 
get_date
[20]    0x110001448    .data      EXP     DS SECdef        [noIMid] 
yyparse
[21]    0x110001460    .data      EXP     DS SECdef        [noIMid] 
strcmp
[22]    0x110001470    .data      EXP     RW    BSS        [noIMid] 
p_xargc
[23]    0x110001478    .data      EXP     RW    BSS        [noIMid] 
p_xargv
[24]    0x1100014b0    .data      EXP     RW    BSS        [noIMid] 
p_xrcfg
[25]    0x1100014b4    .data      EXP     RW    BSS        [noIMid] 
p_xrc
[26]    0x1100015b0     .bss      EXP     RW    BSS        [noIMid] 
fc_softc
[27]    0x1100015b8     .bss      EXP     RW    BSS        [noIMid] 
ras_arg_t
[28]    0x1100015d0     .bss      EXP     RW    BSS        [noIMid] 
end
[29]    0x00000000    undef      IMP     DS EXTref              .. 
main
[30]    0x00000000    undef      IMP     DS EXTref              .. 
smb_register_vfs
[31]    0x00000000    undef      IMP     DS EXTref              .. 
lp_parm_string_list

The important things to look at:

Any symbol in the .so called from the main module must have EXP in 
the
IMEX column.

Any symbol the .so calls in the main module must have .. or . in the
IMPId column.

BUilding shared object with cc -G takes care of that.

HtH

Cheers

Heinrich
-- 
Heinrich Mislik
Zentraler Informatikdienst der Universitaet Wien
A-1010 Wien, Universitaetsstrasse 7
Tel.: (+43 1) 4277-14056, Fax: (+43 1) 4277-9140