(gdb) bt
#0  0x00f65402 in __kernel_vsyscall ()
#1  0x00760d80 in raise () from /lib/libc.so.6
#2  0x00762691 in abort () from /lib/libc.so.6
#3  0x0079924b in __libc_message () from /lib/libc.so.6
#4  0x007a10f1 in _int_free () from /lib/libc.so.6
#5  0x007a4bc0 in free () from /lib/libc.so.6
#6  0x0078fc56 in fclose@@GLIBC_2.1 () from /lib/libc.so.6
#7  0x080b04e6 in filestream_destructor ()
#8  0x08074990 in ao2_ref ()
#9  0x080b308f in ast_filestream_frame_freed ()
#10 0x080b461f in __frame_free ()
#11 0x080b477b in ast_frame_free ()
#12 0x0020e397 in moh_files_generator (chan=0xb2d31198, data=0xb3005990, len=160, samples=160)
    at res_musiconhold.c:295
#13 0x0808b660 in ast_read_generator_actions ()
#14 0x0808cfce in __ast_read ()
#15 0x0808d276 in ast_read ()
#16 0x08079aa5 in autoservice_run ()
#17 0x08120aeb in dummy_start ()
#18 0x008b249b in start_thread () from /lib/libpthread.so.0
#19 0x0080942e in clone () from /lib/libc.so.6
(gdb) bt full
#0  0x00f65402 in __kernel_vsyscall ()
No symbol table info available.
#1  0x00760d80 in raise () from /lib/libc.so.6
No symbol table info available.
#2  0x00762691 in abort () from /lib/libc.so.6
No symbol table info available.
#3  0x0079924b in __libc_message () from /lib/libc.so.6
No symbol table info available.
#4  0x007a10f1 in _int_free () from /lib/libc.so.6
No symbol table info available.
#5  0x007a4bc0 in free () from /lib/libc.so.6
No symbol table info available.
#6  0x0078fc56 in fclose@@GLIBC_2.1 () from /lib/libc.so.6
No symbol table info available.
#7  0x080b04e6 in filestream_destructor ()
No symbol table info available.
#8  0x08074990 in ao2_ref ()
No symbol table info available.
#9  0x080b308f in ast_filestream_frame_freed ()
No symbol table info available.
#10 0x080b461f in __frame_free ()
No symbol table info available.
#11 0x080b477b in ast_frame_free ()
No symbol table info available.
#12 0x0020e397 in moh_files_generator (chan=0xb2d31198, data=0xb3005990, len=160, samples=160)
    at res_musiconhold.c:295
        state = (struct moh_files_state *) 0xb3005990
        f = (struct ast_frame *) 0x9783a80
        res = 0
        __PRETTY_FUNCTION__ = "moh_files_generator"
#13 0x0808b660 in ast_read_generator_actions ()
No symbol table info available.
#14 0x0808cfce in __ast_read ()
No symbol table info available.
#15 0x0808d276 in ast_read ()
No symbol table info available.
#16 0x08079aa5 in autoservice_run ()
No symbol table info available.
#17 0x08120aeb in dummy_start ()
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#18 0x008b249b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#19 0x0080942e in clone () from /lib/libc.so.6
No symbol table info available.
(gdb) thread apply all bt

Thread 1 (process 15520):
#0  0x00f65402 in __kernel_vsyscall ()
#1  0x00760d80 in raise () from /lib/libc.so.6
#2  0x00762691 in abort () from /lib/libc.so.6
#3  0x0079924b in __libc_message () from /lib/libc.so.6
#4  0x007a10f1 in _int_free () from /lib/libc.so.6
#5  0x007a4bc0 in free () from /lib/libc.so.6
#6  0x0078fc56 in fclose@@GLIBC_2.1 () from /lib/libc.so.6
#7  0x080b04e6 in filestream_destructor ()
#8  0x08074990 in ao2_ref ()
#9  0x080b308f in ast_filestream_frame_freed ()
#10 0x080b461f in __frame_free ()
#11 0x080b477b in ast_frame_free ()
#12 0x0020e397 in moh_files_generator (chan=0xb2d31198, data=0xb3005990, len=160, samples=160)
    at res_musiconhold.c:295
#13 0x0808b660 in ast_read_generator_actions ()
#14 0x0808cfce in __ast_read ()
#15 0x0808d276 in ast_read ()
#16 0x08079aa5 in autoservice_run ()
#17 0x08120aeb in dummy_start ()
#18 0x008b249b in start_thread () from /lib/libpthread.so.0
#19 0x0080942e in clone () from /lib/libc.so.6