Already logging to gdb.txt.
#0  0x00000032fa8082e9 in pthread_mutex_lock () from /lib64/libpthread.so.0
#1  0x00002aaabdb44605 in ast_mutex_lock (pmutex=0x0)
    at /usr/src/asterisk/asterisk-1.4.24.1/include/asterisk/lock.h:755
#2  0x00002aaabdb4dfc6 in sip_senddigit_begin (ast=0x2aaaac0d2860, 
    digit=42 '*') at chan_sip.c:3910
#3  0x0000000000445427 in ast_senddigit_begin (chan=0x2aaaac0d2860, 
    digit=42 '*') at channel.c:2669
#4  0x00000000004455ca in ast_senddigit (chan=0x2aaaac0d2860, digit=42 '*')
    at channel.c:2705
#5  0x000000000041b6b0 in ast_dtmf_stream (chan=0x2aaaac0d2860, 
    peer=0x6a4fc60, digits=0x40690f90 "*", between=100) at app.c:252
#6  0x00002aaaab0ce9d4 in ast_bridge_call (chan=0x2aaaac0d2860, 
    peer=0x6a4fc60, config=0x406913c0) at res_features.c:1768
#7  0x00002aaabb2ace03 in dial_exec_full (chan=0x2aaaac0d2860, 
    data=0x40694430, peerflags=0x40692290, continue_exec=0x0)
    at app_dial.c:1765
#8  0x00002aaabb2ad00c in dial_exec (chan=0x2aaaac0d2860, data=0x40694430)
    at app_dial.c:1804
#9  0x000000000048340c in pbx_exec (c=0x2aaaac0d2860, app=0x68740b0, 
    data=0x40694430) at pbx.c:537
#10 0x0000000000486c53 in pbx_extension_helper (c=0x2aaaac0d2860, con=0x0, 
    context=0x2aaaac0d2ab0 "macro-dialout", exten=0x2aaaac0d2b00 "s", 
    priority=4, label=0x0, callerid=0x6a1e3b0 "22036937 ", action=E_SPAWN)
    at pbx.c:1863
#11 0x0000000000487e2b in ast_spawn_extension (c=0x2aaaac0d2860, 
    context=0x2aaaac0d2ab0 "macro-dialout", exten=0x2aaaac0d2b00 "s", 
    priority=4, callerid=0x6a1e3b0 "22036937 ") at pbx.c:2320
#12 0x00002aaac41789f6 in _macro_exec (chan=0x2aaaac0d2860, data=0x406999b0, 
    exclusive=0) at app_macro.c:346
#13 0x00002aaac417978a in macro_exec (chan=0x2aaaac0d2860, data=0x406999b0)
    at app_macro.c:538
#14 0x000000000048340c in pbx_exec (c=0x2aaaac0d2860, app=0x6973200, 
    data=0x406999b0) at pbx.c:537
#15 0x0000000000486c53 in pbx_extension_helper (c=0x2aaaac0d2860, con=0x0, 
    context=0x2aaaac0d2ab0 "macro-dialout", exten=0x2aaaac0d2b00 "s", 
    priority=1, label=0x0, callerid=0x6a1e3b0 "22036937 ", action=E_SPAWN)
    at pbx.c:1863
#16 0x0000000000487e2b in ast_spawn_extension (c=0x2aaaac0d2860, 
    context=0x2aaaac0d2ab0 "macro-dialout", exten=0x2aaaac0d2b00 "s", 
    priority=1, callerid=0x6a1e3b0 "22036937 ") at pbx.c:2320
#17 0x00000000004882a3 in __ast_pbx_run (c=0x2aaaac0d2860) at pbx.c:2410
#18 0x00000000004892f2 in pbx_thread (data=0x2aaaac0d2860) at pbx.c:2636
#19 0x00000000004cb07b in dummy_start (data=0x2aaaac0b72d0) at utils.c:856
#20 0x00000032fa8062f7 in start_thread () from /lib64/libpthread.so.0
#21 0x00000032f9cd1e3d in clone () from /lib64/libc.so.6