i reverted back the declaration of "mi_fifo".
output of commands

(gdb) info locals
cb = 0x7f09ffffffff
FUNCTION = "run_create_callbacks"

(gdb) p *cb
Cannot access memory at address 0x7f09ffffffff

gdb trace

(gdb) bt
#0 0x00007f093abdaf6d in run_create_callbacks (dlg=0x7f093f634028, msg=0x7f09600d4d70) at dlg_cb.c:230
#1 0x00007f093abf6edf in dlg_new_dialog (req=0x7f09600d4d70, t=0x7f093f632998, run_initial_cbs=1) at dlg_handlers.c:869
#2 0x00007f093abf580e in dlg_onreq (t=0x7f093f632998, type=1, param=0x7f093f133c60 ) at dlg_handlers.c:722
#3 0x00007f093ee6cb25 in run_reqin_callbacks_internal (hl=0x7f093f1516e8, trans=0x7f093f632998, params=0x7f093f133c60 ) at t_hooks.c:360
#4 0x00007f093ee6cc31 in run_reqin_callbacks (trans=0x7f093f632998, req=0x7f09600d4d70, code=1) at t_hooks.c:385
#5 0x00007f093ee28e63 in build_cell (p_msg=0x7f09600d4d70) at h_table.c:373
#6 0x00007f093ee7ee8c in new_t (p_msg=0x7f09600d4d70) at t_lookup.c:1269
#7 0x00007f093ee80194 in t_newtran (p_msg=0x7f09600d4d70) at t_lookup.c:1409
#8 0x00007f093ee51f8c in t_relay_to (p_msg=0x7f09600d4d70, proxy=0x0, proto=0, replicate=0) at t_funcs.c:242
#9 0x00007f093ee949e8 in _w_t_relay_to (p_msg=0x7f09600d4d70, proxy=0x0, force_proto=0) at tm.c:1425
#10 0x00007f093ee95c6d in w_t_relay (p_msg=0x7f09600d4d70, _foo=0x0, _bar=0x0) at tm.c:1626
#11 0x000000000041f71f in do_action (h=0x7ffd10afbe10, a=0x7f095fea3e00, msg=0x7f09600d4d70) at action.c:1054
#12 0x000000000042c5aa in run_actions (h=0x7ffd10afbe10, a=0x7f095fea3e00, msg=0x7f09600d4d70) at action.c:1549
#13 0x000000000042cc6a in run_actions_safe (h=0x7ffd10affa20, a=0x7f095fea3e00, msg=0x7f09600d4d70) at action.c:1614
#14 0x000000000055a40a in rval_get_int (h=0x7ffd10affa20, msg=0x7f09600d4d70, i=0x7ffd10afc204, rv=0x7f095fea41e8, cache=0x0) at rvalue.c:912
#15 0x000000000055ea84 in rval_expr_eval_int (h=0x7ffd10affa20, msg=0x7f09600d4d70, res=0x7ffd10afc204, rve=0x7f095fea41e0) at rvalue.c:1910
#16 0x000000000055eee6 in rval_expr_eval_int (h=0x7ffd10affa20, msg=0x7f09600d4d70, res=0x7ffd10afc368, rve=0x7f095fea49a8) at rvalue.c:1918
#17 0x000000000041f1ca in do_action (h=0x7ffd10affa20, a=0x7f095fea5318, msg=0x7f09600d4d70) at action.c:1030
#18 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f095fe89468, msg=0x7f09600d4d70) at action.c:1549
#19 0x000000000041bee8 in do_action (h=0x7ffd10affa20, a=0x7f09600506c0, msg=0x7f09600d4d70) at action.c:678
#20 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f09600504c8, msg=0x7f09600d4d70) at action.c:1549
#21 0x000000000041bee8 in do_action (h=0x7ffd10affa20, a=0x7f096001a7c8, msg=0x7f09600d4d70) at action.c:678
#22 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f0960019928, msg=0x7f09600d4d70) at action.c:1549
#23 0x000000000041bee8 in do_action (h=0x7ffd10affa20, a=0x7f095ff13550, msg=0x7f09600d4d70) at action.c:678
#24 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f095ff0d1c0, msg=0x7f09600d4d70) at action.c:1549
#25 0x000000000041bee8 in do_action (h=0x7ffd10affa20, a=0x7f095ffeb4a8, msg=0x7f09600d4d70) at action.c:678
#26 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f095ffe6848, msg=0x7f09600d4d70) at action.c:1549
#27 0x000000000041bee8 in do_action (h=0x7ffd10affa20, a=0x7f095ff30b18, msg=0x7f09600d4d70) at action.c:678
#28 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f095ff1ba00, msg=0x7f09600d4d70) at action.c:1549
#29 0x000000000041bee8 in do_action (h=0x7ffd10affa20, a=0x7f095fdf2e50, msg=0x7f09600d4d70) at action.c:678
#30 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f095fdf23b8, msg=0x7f09600d4d70) at action.c:1549
#31 0x000000000041f68e in do_action (h=0x7ffd10affa20, a=0x7f095fdf30b0, msg=0x7f09600d4d70) at action.c:1045
#32 0x000000000042c5aa in run_actions (h=0x7ffd10affa20, a=0x7f095fde98f8, msg=0x7f09600d4d70) at action.c:1549
#33 0x000000000042cd53 in run_top_route (a=0x7f095fde98f8, msg=0x7f09600d4d70, c=0x0) at action.c:1635
#34 0x000000000051d57a in receive_msg (
buf=0xabb500 "INVITE sip:919503338275@sunilmore.in SIP/2.0\r\nVia: SIP/2.0/UDP sunilmore.in:58178;branch=z9hG4bK-524287-1---1ac92542ea6fa051;rport\r\nMax-Forwards: 69\r\nContact: <sip:zG8s8uYj9@sunilmore.in:58178;rins"..., len=1619, rcv_info=0x7ffd10affd90) at receive.c:240
#35 0x00000000006302f1 in udp_rcv_loop () at udp_server.c:495
#36 0x00000000004b3062 in main_loop () at main.c:1600
#37 0x00000000004ba772 in main (argc=13, argv=0x7ffd10b00298) at main.c:2616

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