.
Thread 4 (LWP 12926):
#0  0x00007f866f1143cd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f866fa78394 in g_main_context_poll (priority=2147483647, n_fds=3, fds=0x7f86500010c0, timeout=-1, context=0x7f865800f0e0) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3999
        poll_func = 0x7f866fa87030 <g_poll>
#2  g_main_context_iterate (context=0x7f865800f0e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3700
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 3
        allocated_nfds = 3
        fds = 0x7f86500010c0
#3  0x00007f866fa787fa in g_main_loop_run (loop=0x7f865800f070) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3899
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#4  0x00007f8670053646 in gdbus_shared_thread_func (user_data=0x7f865800f0b0) at /build/buildd/glib2.0-2.37.3/./gio/gdbusprivate.c:278
        data = 0x7f865800f0b0
#5  0x00007f866fa9cc25 in g_thread_proxy (data=0x20ce2d0) at /build/buildd/glib2.0-2.37.3/./glib/gthread.c:798
        thread = 0x20ce2d0
#6  0x00007f866f3f6f8e in start_thread (arg=0x7f865cf64700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f865cf64700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140215061989120, 5562071852665761546, 0, 140215424893024, 140215070378016, 4096, -5603380575529898230, -5603414035845779702}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f866f120e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 3 (LWP 12925):
#0  0x00007f866f1143cd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f866fa78394 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f86580010e0, timeout=24907, context=0x20c6310) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3999
        poll_func = 0x7f866fa87030 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x20c6310, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3700
        max_priority = 2147483647
        timeout = 24907
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f86580010e0
#3  0x00007f866fa7849c in g_main_context_iteration (context=context@entry=0x20c6310, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3766
        retval = <optimized out>
#4  0x00007f865d76ca9d in dconf_gdbus_worker_thread (user_data=0x20c6310) at dconf-gdbus-thread.c:81
        context = 0x20c6310
#5  0x00007f866fa9cc25 in g_thread_proxy (data=0x207c400) at /build/buildd/glib2.0-2.37.3/./glib/gthread.c:798
        thread = 0x207c400
#6  0x00007f866f3f6f8e in start_thread (arg=0x7f865d765700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f865d765700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140215070381824, 5562071852665761546, 0, 140215424893024, 140734226731968, 4096, -5603383877822877942, -5603414035845779702}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f866f120e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 2 (LWP 12900):
#0  0x00007f8672772b16 in ?? ()
No symbol table info available.
#1  0x00007f867275ff2f in ?? ()
No symbol table info available.
#2  0x00007fff00000042 in ?? ()
No symbol table info available.
#3  0xb2ce09ce89776f0a in ?? ()
No symbol table info available.
#4  0x00007f866779cd58 in _DYNAMIC () from /tmp/apport_sandbox_s_Um5E/usr/lib/x86_64-linux-gnu/libdee-1.0.so.4
No symbol table info available.
#5  0x00007f8672766439 in ?? ()
No symbol table info available.
#6  0x00000000000004d0 in ?? ()
No symbol table info available.
#7  0x0000000000000012 in ?? ()
No symbol table info available.
#8  0x0000000000000060 in ?? ()
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 12937):
#0  brasero_sense_data_not_ready (err=0x0, sense_data=0x7f86571d5790 "p") at scsi-sense-data.c:118
        res = BRASERO_SCSI_FAILURE
#1  brasero_sense_data_process (sense_data=sense_data@entry=0x7f86571d5790 "p", err=err@entry=0x0) at scsi-sense-data.c:210
        res = BRASERO_SCSI_FAILURE
#2  0x00007f867254d59b in brasero_scsi_command_issue_sync (command=command@entry=0x7f8644001500, buffer=buffer@entry=0x7f86571d57f0, size=size@entry=4, error=error@entry=0x0) at scsi-sg.c:134
        sense_buffer = "p\000\002\000\000\000\000\n\000\000\000\000:\002\000\000\000\000"
        transport = {interface_id = 83, dxfer_direction = -3, cmd_len = 10 '\n', mx_sb_len = 19 '\023', iovec_count = 0, dxfer_len = 4, dxferp = 0x7f86571d57f0, cmdp = 0x7f8644001500 "C\002\004", sbp = 0x7f86571d5790 "p", timeout = 0, flags = 0, pack_id = 0, usr_ptr = 0x0, status = 2 '\002', masked_status = 1 '\001', msg_status = 0 '\000', sb_len_wr = 18 '\022', host_status = 0, driver_status = 8, resid = 0, duration = 4, info = 1}
        res = <optimized out>
        cmd = 0x7f8644001500
        __PRETTY_FUNCTION__ = "brasero_scsi_command_issue_sync"
#3  0x00007f867253cc51 in brasero_read_toc_pma_atip (cdb=0x7f8644001500, desc_size=8, data=0x7f86571d58d8, size=0x7f86571d58d0, error=0x0) at scsi-read-toc-pma-atip.c:125
        buffer = <optimized out>
        hdr = {len = "\000F", first_track_session = 113 'q', last_track_session = 0 '\000'}
        res = <optimized out>
        request_size = <optimized out>
        buffer_size = <optimized out>
        data = 0x7f86571d58d8
        desc_size = 8
        cdb = 0x7f8644001500
        error = 0x0
        size = 0x7f86571d58d0
#4  0x00007f867253d011 in brasero_mmc1_read_atip (handle=handle@entry=0x7f86440010c0, data=data@entry=0x7f86571d58d8, size=size@entry=0x7f86571d58d0, error=error@entry=0x0) at scsi-read-toc-pma-atip.c:277
        cdb = 0x7f8644001500
        res = <optimized out>
        __PRETTY_FUNCTION__ = "brasero_mmc1_read_atip"
#5  0x00007f867254587f in brasero_medium_get_capacity_CD_RW (code=<optimized out>, handle=0x7f86440010c0, self=0x23616a0) at brasero-medium.c:1158
        atip_data = 0x0
        priv = 0x2361600
        result = <optimized out>
        size = 0
#6  brasero_medium_get_capacity_by_type (code=0x7f86571d58c4, handle=0x7f86440010c0, self=0x23616a0) at brasero-medium.c:1304
        priv = <optimized out>
#7  brasero_medium_init_real (object=<optimized out>, handle=handle@entry=0x7f86440010c0) at brasero-medium.c:2916
        i = <optimized out>
        name = <optimized out>
        priv = <optimized out>
        code = BRASERO_SCSI_ERROR_NONE
        buffer = '\000' <repeats 255 times>
#8  0x00007f86725465c4 in brasero_medium_probe_thread (self=0x23616a0) at brasero-medium.c:3077
        counter = <optimized out>
        wait_time = {tv_sec = 36742784, tv_usec = 0}
        device = 0x235da40 "/dev/sr0"
        code = BRASERO_SCSI_ERROR_NONE
        priv = 0x2361600
        handle = 0x7f86440010c0
#9  0x00007f866fa9cc25 in g_thread_proxy (data=0x230a680) at /build/buildd/glib2.0-2.37.3/./glib/gthread.c:798
        thread = 0x230a680
#10 0x00007f866f3f6f8e in start_thread (arg=0x7f86571d6700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f86571d6700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140214963889920, 5562071852665761546, 0, 140215424893024, 140214972278192, 4096, -5603361002290188534, -5603414035845779702}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#11 0x00007f866f120e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.