(gdb) bt
#0  0x00007f7b43e6fc94 in memcpy () from /lib/libc.so.6
#1  0x00000000004cfcd2 in ast_frdup (f=0x11368b8) at frame.c:528
#2  0x000000000046bf4b in __ast_queue_frame (chan=0x109f878, fin=0x1136660, head=0, after=0x0) at channel.c:1449
#3  0x000000000046c597 in ast_queue_frame (chan=0x109f878, fin=0x1136660) at channel.c:1521
#4  0x0000000000472dfb in __ast_read (chan=0x109f878, dropaudio=0) at channel.c:3934
#5  0x00000000004749b3 in ast_read (chan=0x109f878) at channel.c:4257
#6  0x00007f7b40d91e80 in generic_fax_exec (chan=0x109f878, details=0x10bd198, reserved=0x10143f8, token=0x0) at res_fax.c:1251
#7  0x00007f7b40d98787 in receivefax_exec (chan=0x109f878, data=0x7f7b20c5f570 "/var/spool/asterisk/rxfax/fax-4930050099_1334911772.5676.tif") at res_fax.c:1
#8  0x0000000000500e83 in pbx_exec (c=0x109f878, app=0x7f7b3c09d2f0, data=0x7f7b20c5f570 "/var/spool/asterisk/rxfax/fax-4930050099_1334911772.5676.tif") at p
#9  0x000000000050ada1 in pbx_extension_helper (c=0x109f878, con=0x0, context=0x109fdd0 "faxreceiver", exten=0x109fe20 "7504930050099", priority=4, label=0x0
    combined_find_spawn=1) at pbx.c:4249
#10 0x000000000050c9d7 in ast_spawn_extension (c=0x109f878, context=0x109fdd0 "faxreceiver", exten=0x109fe20 "7504930050099", priority=4, callerid=0x1015970
#11 0x000000000050d46a in __ast_pbx_run (c=0x109f878, args=0x0) at pbx.c:4987
#12 0x000000000050f172 in pbx_thread (data=0x109f878) at pbx.c:5327
#13 0x00000000005644cf in dummy_start (data=0x10bc020) at utils.c:1004
#14 0x00007f7b436858ca in start_thread () from /lib/libpthread.so.0
#15 0x00007f7b43ebf86d in clone () from /lib/libc.so.6
#16 0x0000000000000000 in ?? ()