.
Thread 7 (LWP 3381):
#0  0x00007f47cce3d3dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f47cd5da6b4 in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 6 (LWP 3423):
#0  0x00007f47cd5ca08c in ?? ()
No symbol table info available.
#1  0x0000000000000008 in ?? ()
No symbol table info available.
#2  0x00007f47cde0d235 in ?? ()
No symbol table info available.
#3  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 5 (LWP 3415):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007f47cd61a867 in ?? ()
No symbol table info available.
#2  0x0000000000000001 in ?? ()
No symbol table info available.
#3  0x0000000000b67d80 in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 4 (LWP 3386):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x00007f47cba43aa4 in libusb_wait_for_event (ctx=ctx@entry=0x7f47bc0079a0, tv=tv@entry=0x7f47c8ac5b90) at ../../libusb/io.c:1828
        timeout = {tv_sec = 1379505337, tv_nsec = 125609605}
        r = <optimized out>
        __FUNCTION__ = "libusb_wait_for_event"
#2  0x00007f47cba43f47 in libusb_handle_events_timeout_completed (ctx=ctx@entry=0x7f47bc0079a0, tv=tv@entry=0x7f47c8ac5bd0, completed=completed@entry=0x7f47c8ac5c2c) at ../../libusb/io.c:2144
        r = 0
        poll_timeout = {tv_sec = 60, tv_usec = 0}
        __FUNCTION__ = "libusb_handle_events_timeout_completed"
#3  0x00007f47cba44000 in libusb_handle_events_completed (ctx=ctx@entry=0x7f47bc0079a0, completed=completed@entry=0x7f47c8ac5c2c) at ../../libusb/io.c:2221
        tv = {tv_sec = 60, tv_usec = 0}
#4  0x00007f47cba44851 in sync_transfer_wait_for_completion (transfer=transfer@entry=0x7f47b4000918) at ../../libusb/sync.c:50
        r = <optimized out>
        completed = 0x7f47c8ac5c2c
        ctx = 0x7f47bc0079a0
        __FUNCTION__ = "sync_transfer_wait_for_completion"
#5  0x00007f47cba44929 in do_sync_bulk_transfer (dev_handle=0x7f47bc008ee0, endpoint=<optimized out>, buffer=buffer@entry=0x7f47c8ac5ca0 "", length=length@entry=24, transferred=transferred@entry=0x7f47c8ac5c9c, timeout=timeout@entry=0, type=type@entry=2 '\002') at ../../libusb/sync.c:179
        transfer = 0x7f47b4000918
        completed = 0
        r = <optimized out>
        __FUNCTION__ = "do_sync_bulk_transfer"
#6  0x00007f47cba44cb4 in libusb_bulk_transfer (dev_handle=<optimized out>, endpoint=<optimized out>, data=data@entry=0x7f47c8ac5ca0 "", length=length@entry=24, transferred=transferred@entry=0x7f47c8ac5c9c, timeout=timeout@entry=0) at ../../libusb/sync.c:256
No locals.
#7  0x00007f47cd36c4a6 in ptp_usb_event (wait=0, event=0x7f47c8ac5cf0, params=0x7f47bc00ccb0) at libusb1-glue.c:1564
        ret = 8193
        usbevent = {length = 0, type = 0, code = 0, trans_id = 0, param1 = 0, param2 = 0, param3 = 0}
        ptp_usb = 0x7f47bc009620
        result = <optimized out>
        xread = 0
        rlen = <optimized out>
#8  ptp_usb_event_wait (params=0x7f47bc00ccb0, event=event@entry=0x7f47c8ac5cf0) at libusb1-glue.c:1623
No locals.
#9  0x00007f47cd34c21a in LIBMTP_Read_Event (device=device@entry=0x7f47bc008f60, event=event@entry=0x7f47c8ac5d58, out1=out1@entry=0x7f47c8ac5d5c) at libmtp.c:2153
        params = <optimized out>
        ptp_event = {Code = 4, SessionID = 0, Transaction_ID = 0, Param1 = 0, Param2 = 3366739292, Param3 = 32583, Param4 = 3366739288, Param5 = 32583, Nparam = 96 '`'}
        ret = <optimized out>
        code = <optimized out>
        session_id = <optimized out>
        transaction_id = <optimized out>
        param1 = <optimized out>
        param2 = <optimized out>
        param3 = <optimized out>
        __FUNCTION__ = "LIBMTP_Read_Event"
#10 0x00000000004087b7 in check_event (user_data=0x7f47bc00e9d0) at gvfsbackendmtp.c:573
        device = 0x7f47bc008f60
        param1 = 0
        path = <optimized out>
        backend = <optimized out>
        event_ref = 0x7f47bc00e9d0
        event = LIBMTP_EVENT_NONE
        ret = 0
#11 0x00007f47cd5ff345 in ?? ()
No symbol table info available.
#12 0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (LWP 3384):
#0  0x00007f47cce3d3dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f47cba49198 in poll (__timeout=-1, __nfds=2, __fds=0x7f47c9ac7dc0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
No locals.
#2  linux_udev_event_thread_main (arg=<optimized out>) at ../../libusb/os/linux_udev.c:175
        dummy = 0 '\000'
        r = <optimized out>
        udev_dev = <optimized out>
        fds = {{fd = 9, events = 1, revents = 0}, {fd = 8, events = 1, revents = 0}}
        __FUNCTION__ = "linux_udev_event_thread_main"
#3  0x00007f47cd11ef6e in start_thread (arg=0x7f47c9ac8700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7f47c9ac8700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139946302932736, -3976769020528055013, 0, 139946382712928, 139946359949088, 4096, 3909193735896149275, 3909185527769443611}, 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"
#4  0x00007f47cce49e2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
.
Thread 2 (LWP 3380):
#0  0x00007f47cce3d3dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f47cd5da6b4 in ?? ()
No symbol table info available.
#2  0x00007fff0a15f7f8 in ?? ()
No symbol table info available.
#3  0x00000001cd61a999 in ?? ()
No symbol table info available.
#4  0x0000000000b410d0 in ?? ()
No symbol table info available.
#5  0x000005dc7fffffff in ?? ()
No symbol table info available.
#6  0x0000000000b3b320 in ?? ()
No symbol table info available.
#7  0x0000000000b4b400 in ?? ()
No symbol table info available.
#8  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 3437):
#0  0x00007f47cd5ca093 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.