Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/freeswitch -u freeswitch -g freeswitch -ncwait -nonat'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f1f2e430067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56	../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt full
#0  0x00007f1f2e430067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 47756
        selftid = 10873
#1  0x00007f1f2e431448 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 0, 139771190354408, 139771191368216, 0, 139771192306360, 139771921956829, 1, 
              139771918479761, 139771191368216, 139771918839013, 139771921955251, 139745655728360, 139771809609672, 206158430256, 139745655728584}}, sa_flags = 304818432, 
          sa_restorer = 0x7f19122b2aa0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f1f2e46e1b4 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7f1f2e563210 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
        ap = {{gp_offset = 40, fp_offset = 32543, overflow_arg_area = 0x7f19122b2b90, reg_save_area = 0x7f19122b2b20}}
        fd = 2
        on_2 = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
        written = <optimized out>
#3  0x00007f1f2e47398e in malloc_printerr (action=1, str=0x7f1f2e563238 "munmap_chunk(): invalid pointer", ptr=<optimized out>) at malloc.c:4996
        buf = "00007f1af21d2fb0"
        cp = <optimized out>
#4  0x00007f1f2fa0d64d in vpx_img_free () from /usr/lib/libfreeswitch.so.1
No symbol table info available.
#5  0x00007f1f2f9335d3 in switch_img_free (img=0x0) at src/switch_core_video.c:278
No locals.
#6  0x00007f1f11fbb632 in conference_video_muxing_thread_run (thread=0xba8c, obj=0x2a79) at conference_video.c:3027
        img = 0x7f19056aba70
        lg = 0x0
        file_imgs = {0x7f19056aba70, 0x0}
        file_frame = {codec = 0x0, source = 0x0, packet = 0x0, packetlen = 0, extra_data = 0x0, data = 0x0, datalen = 0, buflen = 0, samples = 0, rate = 0, channels = 0, 
          payload = 0 '\000', timestamp = 0, seq = 0, ssrc = 0, m = SWITCH_FALSE, flags = 0, user_data = 0x0, pmap = 0x0, img = 0x7f19056aba70}
        count_changed = 304325632
        async_file_img = 0x7f191223a400
        normal_file_img = 0x1
        canvas = 0x7f190c231228
        conference = 0x7f190ef77588
        check_codec = 0x1
        write_codecs = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}
        layer = 0x7f190dde9110
        write_frame = {codec = 0x0, source = 0x0, packet = 0x7f1af38233a8, packetlen = 0, extra_data = 0x0, data = 0x7f1af38233b4, datalen = 0, buflen = 16372, samples = 0, rate = 0, 
          channels = 0, payload = 0 '\000', timestamp = 0, seq = 0, ssrc = 0, m = SWITCH_FALSE, flags = 2, user_data = 0x0, pmap = 0x0, img = 0x7f1904b99510}
        file_img = 0x0
        timestamp = 1
        __func__ = "conference_video_muxing_thread_run"
#7  0x00007f1f2fbdf5d0 in dummy_worker (opaque=0x7f1af3778450) at threadproc/unix/thread.c:151
        thread = 0x7f1af3778450
#8  0x00007f1f2e7ae064 in start_thread (arg=0x7f19122b3700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7f19122b3700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139745655731968, 7241701534321556080, 0, 139745585438304, 18, 139745655731968, -7328036662076556688, -7331317203679495568}, 
              mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
---Type <return> to continue, or q <return> to quit--- 
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#9  0x00007f1f2e4e362d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb)