I was having problems with unable to register with real network and sim reader on the testing branch. I was advised on the list to use master branch to sort this problem, I have done this and now I get the following.

<0003> gsm322.c:829 new state 'C1 normal cell selection' -> 'C3 camped normally'
<0005> gsm48_mm.c:4320 (ms 1) Received 'MM_EVENT_CELL_SELECTED' event in state MM IDLE, PLMN search
<0005> gsm48_mm.c:909 new MM IDLE state PLMN search -> location updating needed
<0005> gsm48_mm.c:909 new MM IDLE state location updating needed -> attempting to update
<0005> gsm48_mm.c:426 starting T3212 (periodic loc. upd. delay) with 21600 seconds
<0005> gsm48_mm.c:2291 Do normal Loc. upd.
<000e> gsm48_mm.c:2208 Perform location update (MCC 272, MNC 02 LAC 0x4e2a)
<0005> gsm48_mm.c:2342 LOCATION UPDATING REQUEST
<0005> gsm48_mm.c:2364  using LAI (mcc 272 mnc 02 lac 0x8cad)
<0005> gsm48_mm.c:2372  using TMSI 0x49059a60
<0005> gsm48_mm.c:914 new state MM IDLE, attempting to update -> wait for RR connection (location updating)
<0001> gsm48_rr.c:5449 (ms 1) Message 'RR_EST_REQ' received in state idle (sapi 0)
<000e> gsm48_rr.c:1307 Establish radio link due to mobility management request
<0003> gsm322.c:4049 (ms 1) Event 'EVENT_LEAVE_IDLE' for Cell selection in state 'C3 camped normally'
<0003> gsm322.c:829 new state 'C3 camped normally' -> 'connected mode 1'
<0003> gsm322.c:3665 Going to camping (normal) ARFCN 47.
<0003> gsm322.c:452 Sync to ARFCN=47, but there is a sync already pending
<0001> gsm48_rr.c:355 new state idle -> connection pending
<0001> gsm48_rr.c:1454 CHANNEL REQUEST: 00 (Location Update with NECI)
<0003> gsm322.c:2947 Channel synched. (ARFCN=47, snr=16, BSIC=59)
<0001> gsm322.c:2968 using DSC of 90
<0003> gsm48_rr.c:4820 Channel provides data.
<0001> gsm48_rr.c:1590 RANDOM ACCESS (requests left 5)
<0001> gsm48_rr.c:1647 RANDOM ACCESS (Tx-integer 7 combined no S(lots) 0 ra 0x02)
<0001> gsm48_rr.c:1686 Use MS-TXPWR-MAX-CCH power value 5 (33 dBm)
msgb(0x89b3528): Not enough headroom msgb_push (4150577812 < 7)
backtrace() returned 11 addresses
/usr/local/lib/libosmocore.so.4(osmo_generate_backtrace+0x16) [0xb76df8a6]
/usr/local/lib/libosmocore.so.4(osmo_panic+0x4c) [0xb76df71c]
/usr/local/lib/libosmogsm.so.5(lapdm_phsap_up+0x18c) [0xb76aca4c]
./mobile() [0x808516f]
./mobile() [0x8085c39]
/usr/local/lib/libosmocore.so.4(osmo_wqueue_bfd_cb+0x9e) [0xb76dc98e]
/usr/local/lib/libosmocore.so.4(osmo_select_main+0x192) [0xb76db912]
./mobile() [0x804b9cc]
/lib/i386-linux-gnu/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0xb7541e66]
./mobile() [0x804bb99]

Signal 6 received.
full talloc report on 'layer2 context' (total  21588 bytes in  50 blocks)
    Layer2                         contains    356 bytes in   1 blocks (ref 0) 0x89b3528
    GSM 04.08 L3                   contains    388 bytes in   1 blocks (ref 0) 0x89b6380
    struct gsm322_ba_list          contains    180 bytes in   1 blocks (ref 0) 0x89b3440
    struct gsm48_sysinfo           contains   1452 bytes in   1 blocks (ref 0) 0x89b4d60
    struct gsm48_sysinfo           contains   1452 bytes in   1 blocks (ref 0) 0x89b4780
    struct gsm_sub_plmn_na         contains     16 bytes in   1 blocks (ref 0) 0x89b3f98
    struct gsm_sub_plmn_na         contains     16 bytes in   1 blocks (ref 0) 0x89b3f50
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3f10
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3ed0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3e90
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3e50
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3e10
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3dd0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3d90
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3d50
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3d10
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3cd0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3c90
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3c50
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3c10
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3bd0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3b90
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3b50
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3b10
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3ad0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3a90
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3a50
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3a10
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b39d0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3990
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3950
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3910
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b38d0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b3890
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89aeda8
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89aed68
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89aebe0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89aeea0
    struct gsm_sub_plmn_list       contains     12 bytes in   1 blocks (ref 0) 0x89b31a8
    SIM                            contains    644 bytes in   1 blocks (ref 0) 0x89b44c8
    struct gsm_sim_handler         contains     16 bytes in   1 blocks (ref 0) 0x89b3160
    struct gsm_sim_handler         contains     16 bytes in   1 blocks (ref 0) 0x89b3118
    struct gsm_sim_handler         contains     16 bytes in   1 blocks (ref 0) 0x89aee18
    telnet_connection              contains     49 bytes in   2 blocks (ref 0) 0x89aefa8
        struct telnet_connection       contains     48 bytes in   1 blocks (ref 0) 0x89aef38
    struct gsm322_ba_list          contains    180 bytes in   1 blocks (ref 0) 0x89b3358
    struct osmocom_ms              contains  16364 bytes in   1 blocks (ref 0) 0x89aefe0
    /root/.osmocom/bb              contains     29 bytes in   1 blocks (ref 0) 0x8973488
    main.c:240                     contains     29 bytes in   1 blocks (ref 0) 0x8973430
Aborted
root@tom-ei9dl:~/osmocom-bb/src/host/layer23/src/mobile#