Possible race condition when clear_old_concat_parts is called

Only when sms-combine-concatenated-mo is set to 0,
I experienced a segfault in bearbox (bt full traces bellow)
The line where it crashes is :  keys = dict_keys(incoming_concat_msgs) 
(gw/bb_smscconn.c)
I've added a printf after it and it segfaults without showing my debug 
message,
so we can be sure dict_keys segfault.
Maybe we can have here a possible race condition.

@Paul,Alex, have you experiencing that issue before ?

Vincent.

refs:
2007-10-10 15:43:50.191 [22125] [67] DEBUG: HTTP[SMS_7]: Destroying client 
information
2007-10-10 15:43:50.192 [22125] [101] DEBUG: boxc_receiver: got ack
2007-10-10 15:43:51.001 [22125] [93] DEBUG: clear_old_concat_parts called
Erreur de segmentation (core dumped)


Program terminated with signal 11, Segmentation fault.
#0  0x000000000049622f in lock (dict=0x0) at gwlib/dict.c:127
127         mutex_lock(dict->lock);
(gdb) bt full
#0  0x000000000049622f in lock (dict=0x0) at gwlib/dict.c:127
        __func__ = "lock"
#1  0x0000000000496990 in dict_keys (dict=0x0) at gwlib/dict.c:355
        list = (List *) 0x941a20
        item = (Item *) 0x470ce2a2
        i = 2049294384
        j = 4858217
        __func__ = "dict_keys"
#2  0x0000000000417b25 in clear_old_concat_parts () at gw/bb_smscconn.c:1263
        keys = (List *) 0x0
        key = (Octstr *) 0x7a25c0f0
        __func__ = "clear_old_concat_parts"
#3  0x0000000000415d17 in sms_router (arg=0x0) at gw/bb_smscconn.c:527
        msg = (Msg *) 0x0
        startmsg = (Msg *) 0x0
        newmsg = (Msg *) 0x0
        ret = 0
        concat_mo_check = 1192029069
#4  0x00000000004988e4 in new_thread (arg=0x98eb40) at 
gwlib/gwthread-pthread.c:362
        ret = 0
        p = (struct new_thread_args *) 0x98eb40
#5  0x0000003f312062f7 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#6  0x0000003f306d0fbd in clone () from /lib64/libc.so.6
No symbol table info available.

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