(gdb) bt
#0  0x00007f11bf84aa4b in memcpy () from /lib/libc.so.6
#1  0x00000000004d00ea in ast_frdup (f=0x2328428) at frame.c:528
#2  0x000000000046bfcf in __ast_queue_frame (chan=0x7f11b44f91f8, fin=0x23283b0, head=0, after=0x0) at channel.c:1449
#3  0x000000000046c61b in ast_queue_frame (chan=0x7f11b44f91f8, fin=0x23283b0) at channel.c:1521
#4  0x0000000000472eb6 in __ast_read (chan=0x7f11b44f91f8, dropaudio=0) at channel.c:3949
#5  0x0000000000474ab9 in ast_read (chan=0x7f11b44f91f8) at channel.c:4274
#6  0x00007f11bbce7e80 in generic_fax_exec (chan=0x7f11b44f91f8, details=0x3266098, reserved=0x223bee8, token=0x0) at res_fax.c:1251
#7  0x00007f11bbcee7a8 in receivefax_exec (chan=0x7f11b44f91f8, data=0x7f11997ee570 "/var/spool/asterisk/rxfax/fax-4930055379_1336561098.86585.tif") at res_fax.c:1761
#8  0x00000000005015db in pbx_exec (c=0x7f11b44f91f8, app=0x7f11b4005950, data=0x7f11997ee570 "/var/spool/asterisk/rxfax/fax-4930055379_1336561098.86585.tif") at pbx.c:1430
#9  0x000000000050b4f9 in pbx_extension_helper (c=0x7f11b44f91f8, con=0x0, context=0x7f11b44f9750 "faxreceiver", exten=0x7f11b44f97a0 "7504930055379", priority=4, label=0x0,
    callerid=0x7f11b4059410 "Anonymous", action=E_SPAWN, found=0x7f11997f0c60, combined_find_spawn=1) at pbx.c:4249
#10 0x000000000050d12f in ast_spawn_extension (c=0x7f11b44f91f8, context=0x7f11b44f9750 "faxreceiver", exten=0x7f11b44f97a0 "7504930055379", priority=4, callerid=0x7f11b4059410 "Anonymous",
    found=0x7f11997f0c60, combined_find_spawn=1) at pbx.c:4887
#11 0x000000000050dbc2 in __ast_pbx_run (c=0x7f11b44f91f8, args=0x0) at pbx.c:4987
#12 0x000000000050f8ca in pbx_thread (data=0x7f11b44f91f8) at pbx.c:5327
#13 0x0000000000564cdf in dummy_start (data=0x7f11b44eebd0) at utils.c:1004
#14 0x00007f11bf0608ca in start_thread () from /lib/libpthread.so.0
#15 0x00007f11bf89a86d in clone () from /lib/libc.so.6
#16 0x0000000000000000 in ?? ()