(gdb) bt
#0  0x280cf187 in IncomingSMS (messagetype=20, message=0x805b2b0 "\001\b",
    length=12, data=0x8075000, state=0x8055e20) at nk6100.c:1690
#1  0x280b06eb in sm_incoming_function (messagetype=20 '\024',
    message=0x805b2b0, messagesize=12, state=0x8055e20)
    at gsm-statemachine.c:122
#2  0x280d79d7 in fbus_rx_statemachine (rx_byte=125 '}', state=0x8055e20)
    at fbus.c:360
#3  0x280d7a69 in fbus_loop (timeout=0xbfafeb44, state=0x8055e20) at fbus.c:386
#4  0x280b058b in gn_sm_loop (timeout=0, state=0x8055e20)
    at gsm-statemachine.c:77
#5  0x280b09ae in __sm_block_timeout (waitfor=20, t=40, data=0x806d000,
    state=0x8055e20) at gsm-statemachine.c:233
#6  0x280b0b5b in sm_block_timeout (waitfor=20, t=40, data=0x806d000,
    state=0x8055e20) at gsm-statemachine.c:265
#7  0x280b0bb2 in sm_block (waitfor=20, data=0x806d000, state=0x8055e20)
    at gsm-statemachine.c:275
#8  0x280cead9 in GetSMSStatus (data=0x806d000, state=0x8055e20)
    at nk6100.c:1521
#9  0x280cc472 in Functions (op=GN_OP_Init, data=0x806d000, state=0x8055e20)
    at nk6100.c:265
#10 0x280b0c07 in gn_sm_functions (op=GN_OP_GetSMSStatus, data=0x806d000,
    sm=0x0) at gsm-statemachine.c:297
#11 0x804a785 in Connect ()
#12 0x2811520f in _thread_start () from /usr/lib/libc_r.so.4
#13 0x0 in ?? ()