I have been experimenting with the following code, run from an IELM buffer:

    (make-thread (lambda ()
        (sit-for 5)
        (with-current-buffer "z"
            (insert "foo"))))

I then keep the "z" bufer open in a different window so that I can see what is going on.

If I type this command and then wait 5 seconds, the buffer get updated just as I expect.

If I then type the same command again, Emacs crashes after 5 seconds. Sometimes I have to try more than twice to get Emacs to crash, but it will inevitably happen.

Also, when the crash doesn't happen, and I keep pressing RET after running the above form, the insert will happen after much less than 5 seconds. Sometimes it happens almost immediately. It's like sit-for actually doesn't wait the correct number of seconds, but rather will just finish as soon as control is returned to the thread.

Here is the stack trace:

GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
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Reading symbols from dist/bin/emacs...done.
(gdb) run
Starting program: /home/elias/src/emacs/dist/bin/emacs 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe7a00700 (LWP 10570)]
[New Thread 0x7fffe6bda700 (LWP 10571)]
[New Thread 0x7fffe63d9700 (LWP 10572)]

(emacs:10566): Gtk-CRITICAL **: gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed

(emacs:10566): Gtk-CRITICAL **: gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed

(emacs:10566): Gtk-CRITICAL **: gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed

(emacs:10566): Gtk-CRITICAL **: gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed
[New Thread 0x7fffd7fff700 (LWP 10614)]
Fatal error 6: Aborted
Backtrace:
/home/elias/src/emacs/dist/bin/emacs[0x586840]
/home/elias/src/emacs/dist/bin/emacs[0x55fccc]
/home/elias/src/emacs/dist/bin/emacs[0x5868ca]
/home/elias/src/emacs/dist/bin/emacs[0x57117a]
/home/elias/src/emacs/dist/bin/emacs[0x571191]
/home/elias/src/emacs/dist/bin/emacs[0x6b675d]
/home/elias/src/emacs/dist/bin/emacs[0x68c951]
/home/elias/src/emacs/dist/bin/emacs[0x5e612a]
/home/elias/src/emacs/dist/bin/emacs[0x68c9ef]
/home/elias/src/emacs/dist/bin/emacs[0x6657fa]
/home/elias/src/emacs/dist/bin/emacs[0x56a7f0]
/home/elias/src/emacs/dist/bin/emacs[0x566d04]
/home/elias/src/emacs/dist/bin/emacs[0x566fae]
/home/elias/src/emacs/dist/bin/emacs[0x5685f9]
/home/elias/src/emacs/dist/bin/emacs[0x638be4]
/home/elias/src/emacs/dist/bin/emacs[0x638ede]
/home/elias/src/emacs/dist/bin/emacs[0x60cedc]
/home/elias/src/emacs/dist/bin/emacs[0x60ca87]
/home/elias/src/emacs/dist/bin/emacs[0x655c63]
/home/elias/src/emacs/dist/bin/emacs[0x60d527]
/home/elias/src/emacs/dist/bin/emacs[0x60d279]
/home/elias/src/emacs/dist/bin/emacs[0x60b71b]
/home/elias/src/emacs/dist/bin/emacs[0x60787a]
/home/elias/src/emacs/dist/bin/emacs[0x60d83e]
/home/elias/src/emacs/dist/bin/emacs[0x60cb89]
/home/elias/src/emacs/dist/bin/emacs[0x68cc3d]
/home/elias/src/emacs/dist/bin/emacs[0x609508]
/home/elias/src/emacs/dist/bin/emacs[0x68cd60]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x770a)[0x7ffff1d8b70a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7ffff18bd82d]

Thread 5 "emacs" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffd7fff700 (LWP 10614)]
0x00007ffff1d952b9 in raise (sig=6) at ../sysdeps/unix/sysv/linux/pt-raise.c:35
35 ../sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
(gdb) bt full
#0  0x00007ffff1d952b9 in raise (sig=6)
    at ../sysdeps/unix/sysv/linux/pt-raise.c:35
        resultvar = 0
        pid = <optimised out>
#1  0x000000000055fd18 in terminate_due_to_signal (sig=6, backtrace_limit=40)
    at emacs.c:394
No locals.
#2  0x00000000005868ca in emacs_abort () at sysdep.c:2342
No locals.
#3  0x000000000057117a in unblock_input_to (level=-1) at keyboard.c:7170
No locals.
#4  0x0000000000571191 in unblock_input () at keyboard.c:7186
No locals.
#5  0x00000000006b675d in xg_select (fds_lim=16, rfds=0x7fffd7ffd8a0, 
    wfds=0x7fffd7ffd920, efds=0x0, timeout=0x7fffd7ffd830, sigmask=0x0)
    at xgselect.c:162
        pselect_errno = 11
        all_rfds = {fds_bits = {0 <repeats 16 times>}}
        all_wfds = {fds_bits = {0 <repeats 16 times>}}
        tmo = {tv_sec = 11139005, tv_nsec = 11138972}
        tmop = 0x7fffd7ffd830
        context = 0x15e43f0
        have_wfds = true
        gfds_buf = {{fd = 6, events = 1, revents = 0}, {fd = 7, events = 1, 
            revents = 0}, {fd = 10, events = 1, revents = 0}, {fd = 38228997, 
            events = 0, revents = 0}, {fd = 38228997, events = 0, 
            revents = 0}, {fd = 0, events = 0, 
            revents = 0} <repeats 12 times>, {fd = -805303520, events = 32767, 
            revents = 0}, {fd = 4, events = 0, revents = 0}, {fd = 48, 
            events = 0, revents = 0}, {fd = -671100224, events = 32767, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = 0, 
            events = 0, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = 671100225, events = 32768, revents = 65535}, {fd = 26, 
            events = 0, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = 2, events = 0, revents = 0}, {fd = 0, events = 0, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = 91, 
            events = 110, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = 0, events = 0, revents = 0}, {fd = 119, events = 124, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = 13336224, 
            events = 0, revents = 0}, {fd = -671100064, events = 32767, 
            revents = 0}, {fd = 6210590, events = 0, revents = 0}, {
            fd = 30279696, events = 0, revents = 0}, {fd = 13336224, 
            events = 0, revents = 0}, {fd = 48, events = 0, revents = 0}, {
            fd = 52552659, events = 0, revents = 0}, {fd = 30, events = 0, 
            revents = 0}, {fd = -671090240, events = 32767, revents = 0}, {
            fd = 0, events = 0, revents = 0}, {fd = 12896288, events = 0, 
            revents = 0}, {fd = -671099984, events = 32767, revents = 0}, {
            fd = 6210590, events = 6, revents = 0}, {fd = 0, events = 0, 
            revents = 0}, {fd = 12896288, events = 0, revents = 0}, {
            fd = 13336224, events = 0, revents = 0}, {fd = -671100064, 
            events = 32767, revents = 0}, {fd = 28224, events = 0, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = -671099936, 
            events = 32767, revents = 0}, {fd = 6213781, events = 0, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = 0, 
            events = 0, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = 28224, events = 0, revents = 0}, {fd = 12896288, events = 0, 
            revents = 0}, {fd = -671100880, events = 32767, revents = 0}, {
            fd = -671099856, events = 32767, revents = 0}, {fd = 13366832, 
            events = 0, revents = 0}, {fd = 13338608, events = 0, 
            revents = 0}, {fd = 11138972, events = 0, revents = 0}, {
            fd = 30279696, events = 0, revents = 0}, {fd = 13336224, 
            events = 0, revents = 0}, {fd = 5618213, events = 0, revents = 0}, 
          {fd = 28224, events = 0, revents = 0}, {fd = -671099888, 
            events = 32767, revents = 0}, {fd = 6212474, events = 0, 
            revents = 0}, {fd = 13336224, events = 0, revents = 0}, {fd = 0, 
            events = 0, revents = 0}, {fd = 5622450, events = 0, revents = 0}, 
          {fd = 0, events = 0, revents = 0}, {fd = -671099792, events = 32767, 
            revents = 0}, {fd = 6216368, events = 0, revents = 0}, {fd = 0, 
            events = 0, revents = 0}, {fd = 28224, events = 0, revents = 0}, {
            fd = 1030, events = 0, revents = 0}, {fd = -237418071, 
            events = 32767, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = -189921887, events = 32767, revents = 0}, {fd = 7, 
            events = 0, revents = 0}, {fd = -1, events = 65535, 
            revents = 65535}, {fd = 22977320, events = 0, revents = 0}, {
            fd = -671099648, events = 1, revents = 0}, {fd = 22977264, 
            events = 0, revents = 0}, {fd = 22973088, events = 0, 
            revents = 0}, {fd = 22973140, events = 0, revents = 0}, {
            fd = 4096, events = 0, revents = 0}, {fd = 0, events = 0, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = -671099776, 
            events = 32767, revents = 0}, {fd = -805283021, events = 32767, 
            revents = 0}, {fd = -671099696, events = 32767, revents = 0}, {
            fd = 5618458, events = 0, revents = 0}, {fd = -805283037, 
            events = 32767, revents = 0}, {fd = -805283021, events = 32767, 
            revents = 0}, {fd = -671099632, events = 32767, revents = 0}, {
            fd = 6171307, events = 0, revents = 0}, {fd = 13338608, 
            events = 0, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = 0, events = 0, revents = 0}, {fd = -671099632, 
            events = 32767, revents = 0}, {fd = 13480832, events = 0, 
            revents = 0}, {fd = 0, events = 0, revents = 0}, {fd = -237439665, 
            events = 32767, revents = 0}, {fd = 1481473899, events = 0, 
            revents = 0}, {fd = 1481473899, events = 0, revents = 0}, {
            fd = 800000082, events = 0, revents = 0}, {fd = -671099568, 
            events = 32767, revents = 0}, {fd = 6269001, events = 0, 
            revents = 0}, {fd = 32619, events = 2130, revents = 12207}, {
            fd = 1481473899, events = 0, revents = 0}, {fd = 99862007, 
            events = 0, revents = 0}, {fd = 0, events = 0, revents = 0}, {
            fd = 0, events = 0, revents = 0}, {fd = 99862007, events = 0, 
            revents = 0}, {fd = -671099440, events = 32767, revents = 0}, {
            fd = 7121051, events = 0, revents = 0}, {fd = 1481473899, 
            events = 0, revents = 0}, {fd = 700138075, events = 0, 
            revents = 0}, {fd = 1481473899, events = 0, revents = 0}, {
            fd = 6870706, events = 0, revents = 0}, {fd = 22605, events = 0, 
            revents = 0}, {fd = 13480832, events = 0, revents = 0}}
        gfds = 0x7fffd7ffd1b0
        gfds_size = 128
        n_gfds = 3
        retval = 0
        our_fds = 0
        max_fds = 15
        context_acquired = true
        i = 3
        nfds = 0
        tmo_in_millisec = -1
        must_free = 0
        need_to_dispatch = true
#6  0x000000000068c951 in really_call_select (arg=0x7fffd7ffd6b0)
    at thread.c:494
        sa = 0x7fffd7ffd6b0
        self = 0x315cad0
#7  0x00000000005e612a in flush_stack_call_func (
    func=0x68c8f5 <really_call_select>, arg=0x7fffd7ffd6b0) at alloc.c:5137
        end = 0x7fffd7ffd618
        self = 0x315cad0
#8  0x000000000068c9ef in thread_select (func=0x6b5fa2 <xg_select>, 
    max_fds=16, rfds=0x7fffd7ffd8a0, wfds=0x7fffd7ffd920, efds=0x0, 
    timeout=0x7fffd7ffd830, sigmask=0x0) at thread.c:513
        sa = {func = 0x6b5fa2 <xg_select>, max_fds = 16, 
          rfds = 0x7fffd7ffd8a0, wfds = 0x7fffd7ffd920, efds = 0x0, 
          timeout = 0x7fffd7ffd830, sigmask = 0x0, result = 0}
#9  0x00000000006657fa in wait_reading_process_output (time_limit=4, 
    nsecs=999986304, read_kbd=-1, do_display=true, wait_for_cell=0, 
    wait_proc=0x0, just_wait_proc=0) at process.c:5345
        process_skipped = false
        channel = 1024
        nfds = 0
        Available = {fds_bits = {0 <repeats 16 times>}}
        Writeok = {fds_bits = {0 <repeats 16 times>}}
        check_write = true
        check_delay = 1
        no_avail = false
        xerrno = 11
        proc = 140736683055520
        timeout = {tv_sec = 0, tv_nsec = 99862007}
        end_time = {tv_sec = 1481473904, tv_nsec = 167438805}
        timer_delay = {tv_sec = 0, tv_nsec = 99862007}
        got_output_end_time = {tv_sec = 1481473904, tv_nsec = 167438805}
        wait = TIMEOUT
        got_some_output = -1
        retry_for_async = false
        count = 4
        now = {tv_sec = 0, tv_nsec = -1}
#10 0x000000000056a7f0 in kbd_buffer_get_event (kbp=0x7fffd7ffdc38, 
    used_mouse_menu=0x0, end_time=0x7fffd7ffe210) at keyboard.c:3827
        duration = {tv_sec = 4, tv_nsec = 999986304}
        now = {tv_sec = 1481473899, tv_nsec = 167452260}
        obj = 0
#11 0x0000000000566d04 in read_event_from_main_queue (end_time=0x7fffd7ffe210, 
    local_getcjmp=0x7fffd7ffdff0, used_mouse_menu=0x0) at keyboard.c:2159
        c = 0
        save_jump = {{__jmpbuf = {0, 5180808802454270963, 4287728, 
              140737488347936, 0, 0, 5180808802284401651, 
              -5180809199993555981}, __mask_was_saved = 0, __saved_mask = {
              __val = {5758472, 0, 140737488345952, 5618213, 2, 
                140737488346064, 6351221, 0, 3, 52564387, 0, 140737488346064, 
                6171307, 13338608, 43228563, 0}}}}
        kb = 0x5fa849 <lisp_to_timespec+135>
#12 0x0000000000566fae in read_decoded_event_from_main_queue (
    end_time=0x7fffd7ffe210, local_getcjmp=0x7fffd7ffdff0, prev_event=0, 
    used_mouse_menu=0x0) at keyboard.c:2222
        nextevt = 0
        frame = 0x1f0be84
        terminal = 0x0
        events = {0, 124771549, 45552, -7261996244722245888, 0, 0, 
          140736817258000, 5685180, 13338608, 52559587, 0, 140736817258000, 
          5618213, 32554628, 140736817258064, 5676188}
        n = 0
#13 0x00000000005685f9 in read_char (commandflag=0, map=0, prev_event=0, 
    used_mouse_menu=0x0, end_time=0x7fffd7ffe210) at keyboard.c:2810
        c = 0
        jmpcount = 4
        local_getcjmp = {{__jmpbuf = {0, 5180756027070542835, 0, 30, 
              140736817265088, 0, 5180756025826931699, -5180809199993555981}, 
            __mask_was_saved = 0, __saved_mask = {__val = {535979006331203089, 
                0, 124792337, 0, 32575416, 140736817258848, 5684531, 52559331, 
                52559267, 0, 11184747828987305728, 38228997, 22973024, 0, 0, 
                22973048}}}}
        save_jump = {{__jmpbuf = {0, 140737298433706, 1481473899, 22820400, 
              140736817258784, 140737354116324, 140736817258896, 4300673425}, 
            __mask_was_saved = 0, __saved_mask = {__val = {9801621, 30, 
                140736817265088, 140736817258896, 140737245920390, 167438564, 
                1481473904, 1481473904, 167438564, 140736817258928, 7120741, 
                5, 0, 1481473899, 167438564, 13338608}}}}
        tem = 0
        save = 22977264
        previous_echo_area_message = 0
        also_record = 0
        reread = false
        recorded = false
        polling_stopped_here = true
        orig_kboard = 0x1664e80
#14 0x0000000000638be4 in read_filtered_event (no_switch_frame=false, 
    ascii_required=false, error_nonascii=false, input_method=true, seconds=22)
    at lread.c:614
        val = 3
        delayed_switch_frame = 0
        end_time = {tv_sec = 1481473904, tv_nsec = 167438564}
#15 0x0000000000638ede in Fread_event (prompt=0, inherit_input_method=45552, 
    seconds=22) at lread.c:726
No locals.
#16 0x000000000060cedc in funcall_subr (subr=0xc47998 <Sread_event>, 
    numargs=3, args=0x7fffd7ffe3c8) at eval.c:2815
        internal_argbuf = {0, 42963508624, 12876184, 140736817259288, 5622585, 
          46573544208, 12876189, 3}
        internal_args = 0x7fffd7ffe3c8
#17 0x000000000060ca87 in Ffuncall (nargs=4, args=0x7fffd7ffe3c0)
    at eval.c:2735
        fun = 12876189
        original_fun = 549312
        funcar = 31968
        numargs = 3
        val = 6349682
        count = 3
#18 0x0000000000655c63 in exec_byte_code (bytestr=9801588, vector=9801621, 
    maxdepth=30, args_template=3078, nargs=1, args=0x7fffd7ffe818)
    at bytecode.c:726
        v1 = 0
        op = 3
        type = CATCHER
        targets = {0x659537 <exec_byte_code+17754>, 
          0x659594 <exec_byte_code+17847>, 0x659596 <exec_byte_code+17849>, 
          0x659598 <exec_byte_code+17851>, 0x65959a <exec_byte_code+17853>, 
          0x65959a <exec_byte_code+17853>, 0x659600 <exec_byte_code+17955>, 
          0x659672 <exec_byte_code+18069>, 0x6554e9 <exec_byte_code+1292>, 
          0x6554eb <exec_byte_code+1294>, 0x6554ed <exec_byte_code+1296>, 
          0x6554ef <exec_byte_code+1298>, 0x6554f1 <exec_byte_code+1300>, 
          0x6554f1 <exec_byte_code+1300>, 0x6554fa <exec_byte_code+1309>, 
          0x6554b2 <exec_byte_code+1237>, 0x655956 <exec_byte_code+2425>, 
          0x655958 <exec_byte_code+2427>, 0x65595a <exec_byte_code+2429>, 
          0x65595c <exec_byte_code+2431>, 0x65595e <exec_byte_code+2433>, 
          0x65595e <exec_byte_code+2433>, 0x65599c <exec_byte_code+2495>, 
          0x655967 <exec_byte_code+2442>, 0x655b59 <exec_byte_code+2940>, 
          0x655b5b <exec_byte_code+2942>, 0x655b5d <exec_byte_code+2944>, 
          0x655b5f <exec_byte_code+2946>, 0x655b61 <exec_byte_code+2948>, 
          0x655b61 <exec_byte_code+2948>, 0x655b0a <exec_byte_code+2861>, 
          0x655b24 <exec_byte_code+2887>, 0x655c21 <exec_byte_code+3140>, 
          0x655c23 <exec_byte_code+3142>, 0x655c25 <exec_byte_code+3144>, 
          0x655c27 <exec_byte_code+3146>, 0x655c29 <exec_byte_code+3148>, 
          0x655c29 <exec_byte_code+3148>, 0x655bd2 <exec_byte_code+3061>, 
          0x655bec <exec_byte_code+3087>, 0x655cec <exec_byte_code+3343>, 
          0x655cee <exec_byte_code+3345>, 0x655cf0 <exec_byte_code+3347>, 
          0x655cf2 <exec_byte_code+3349>, 0x655cf4 <exec_byte_code+3351>, 
          0x655cf4 <exec_byte_code+3351>, 0x655c9d <exec_byte_code+3264>, 
          0x655cb7 <exec_byte_code+3290>, 0x656c7c <exec_byte_code+7327>, 
          0x656b21 <exec_byte_code+6980>, 0x656b15 <exec_byte_code+6968>, 
          0x659537 <exec_byte_code+17754>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 0x656ec9 <exec_byte_code+7916>, 
          0x656fc6 <exec_byte_code+8169>, 0x65702a <exec_byte_code+8269>, 
          0x65708f <exec_byte_code+8370>, 0x6570f8 <exec_byte_code+8475>, 
          0x6557cd <exec_byte_code+2032>, 0x65584f <exec_byte_code+2162>, 
          0x657176 <exec_byte_code+8601>, 0x655739 <exec_byte_code+1884>, 
          0x6558c1 <exec_byte_code+2276>, 0x6571e2 <exec_byte_code+8709>, 
          0x657254 <exec_byte_code+8823>, 0x6572a0 <exec_byte_code+8899>, 
          0x657312 <exec_byte_code+9013>, 0x657368 <exec_byte_code+9099>, 
          0x65744a <exec_byte_code+9325>, 0x657496 <exec_byte_code+9401>, 
          0x657508 <exec_byte_code+9515>, 0x65759d <exec_byte_code+9664>, 
          0x6575e9 <exec_byte_code+9740>, 0x657635 <exec_byte_code+9816>, 
          0x6576a7 <exec_byte_code+9930>, 0x657719 <exec_byte_code+10044>, 
          0x65778b <exec_byte_code+10158>, 0x657820 <exec_byte_code+10307>, 
          0x657876 <exec_byte_code+10393>, 0x6578cc <exec_byte_code+10479>, 
          0x6579ae <exec_byte_code+10705>, 0x657a2b <exec_byte_code+10830>, 
          0x657aa8 <exec_byte_code+10955>, 0x657d23 <exec_byte_code+11590>, 
          0x657d9a <exec_byte_code+11709>, 0x657e11 <exec_byte_code+11828>, 
          0x657e88 <exec_byte_code+11947>, 0x657eff <exec_byte_code+12066>, 
          0x657f55 <exec_byte_code+12152>, 0x657fd3 <exec_byte_code+12278>, 
          0x658029 <exec_byte_code+12364>, 0x65807f <exec_byte_code+12450>, 
          0x6580d5 <exec_byte_code+12536>, 0x6581f3 <exec_byte_code+12822>, 
          0x65699d <exec_byte_code+6592>, 0x658252 <exec_byte_code+12917>, 
          0x65829e <exec_byte_code+12993>, 0x658378 <exec_byte_code+13211>, 
          0x6583e2 <exec_byte_code+13317>, 0x658441 <exec_byte_code+13412>, 
          0x65848d <exec_byte_code+13488>, 0x6584d4 <exec_byte_code+13559>, 
          0x65851b <exec_byte_code+13630>, 0x65856a <exec_byte_code+13709>, 
          0x659537 <exec_byte_code+17754>, 0x6585c6 <exec_byte_code+13801>, 
          0x65860d <exec_byte_code+13872>, 0x658654 <exec_byte_code+13943>, 
          0x65869b <exec_byte_code+14014>, 0x6586e2 <exec_byte_code+14085>, 
          0x658729 <exec_byte_code+14156>, 0x65699d <exec_byte_code+6592>, 
          0x659537 <exec_byte_code+17754>, 0x658775 <exec_byte_code+14232>, 
          0x6587c9 <exec_byte_code+14316>, 0x658815 <exec_byte_code+14392>, 
          0x658861 <exec_byte_code+14468>, 0x6588d3 <exec_byte_code+14582>, 
          0x658945 <exec_byte_code+14696>, 0x658991 <exec_byte_code+14772>, 
          0x658a97 <exec_byte_code+15034>, 0x658b09 <exec_byte_code+15148>, 
          0x658b7b <exec_byte_code+15262>, 0x658bed <exec_byte_code+15376>, 
          0x658c34 <exec_byte_code+15447>, 0x659537 <exec_byte_code+17754>, 
          0x6568d1 <exec_byte_code+6388>, 0x655da2 <exec_byte_code+3525>, 
          0x6555e2 <exec_byte_code+1541>, 0x655ec6 <exec_byte_code+3817>, 
          0x65601d <exec_byte_code+4160>, 0x656168 <exec_byte_code+4491>, 
          0x65686a <exec_byte_code+6285>, 0x65689c <exec_byte_code+6335>, 
          0x655ab3 <exec_byte_code+2774>, 0x65695e <exec_byte_code+6529>, 
          0x6569cf <exec_byte_code+6642>, 0x656a62 <exec_byte_code+6789>, 
          0x656aa1 <exec_byte_code+6852>, 0x656cc3 <exec_byte_code+7398>, 
          0x656d3d <exec_byte_code+7520>, 0x656dd2 <exec_byte_code+7669>, 
          0x656e3c <exec_byte_code+7775>, 0x655d56 <exec_byte_code+3449>, 
          0x658c80 <exec_byte_code+15523>, 0x658d15 <exec_byte_code+15672>, 
          0x658d61 <exec_byte_code+15748>, 0x658dad <exec_byte_code+15824>, 
          0x658df9 <exec_byte_code+15900>, 0x658e45 <exec_byte_code+15976>, 
          0x658eb7 <exec_byte_code+16090>, 0x658f29 <exec_byte_code+16204>, 
          0x658f9b <exec_byte_code+16318>, 0x65900d <exec_byte_code+16432>, 
          0x659167 <exec_byte_code+16778>, 0x6591d9 <exec_byte_code+16892>, 
          0x65924b <exec_byte_code+17006>, 0x659297 <exec_byte_code+17082>, 
          0x659309 <exec_byte_code+17196>, 0x65937b <exec_byte_code+17310>, 
          0x6593c7 <exec_byte_code+17386>, 0x659413 <exec_byte_code+17462>, 
          0x65812b <exec_byte_code+12622>, 0x658181 <exec_byte_code+12708>, 
          0x659469 <exec_byte_code+17548>, 0x6594d2 <exec_byte_code+17653>, 
          0x659537 <exec_byte_code+17754>, 0x6562b3 <exec_byte_code+4822>, 
          0x6563aa <exec_byte_code+5069>, 0x6564d5 <exec_byte_code+5368>, 
          0x656600 <exec_byte_code+5667>, 0x656735 <exec_byte_code+5976>, 
          0x6573be <exec_byte_code+9185>, 0x657922 <exec_byte_code+10565>, 
          0x6582ec <exec_byte_code+13071>, 0x659709 <exec_byte_code+18220>, 
          0x65977c <exec_byte_code+18335>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 0x659816 <exec_byte_code+18489>, 
          0x659537 <exec_byte_code+17754>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 0x659537 <exec_byte_code+17754>, 
          0x659537 <exec_byte_code+17754>, 
          0x6598b0 <exec_byte_code+18643> <repeats 64 times>}
        const_length = 12
        bytestr_length = 90
        vectorp = 0x958f98 <pure+128088>
        stack = {pc = 0xc3b95d <pure+3153437> ")\211?\206W", 
          byte_string = 9801588, 
          byte_string_start = 0xc3b913 <pure+3153363> "\001\247\203\022", 
          next = 0x0}
        quitcounter = 5 '\005'
        stack_items = 8
        sa_avail = 16320
        sa_count = 2
        sa_must_free = false
        stack_base = 0x7fffd7ffe3a0
        stack_lim = 0x7fffd7ffe3e0
        top = 0x7fffd7ffe3c0
        count = 2
        result = 73014444032
#19 0x000000000060d527 in funcall_lambda (fun=9801541, nargs=1, 
    arg_vector=0x7fffd7ffe810) at eval.c:2935
        size = 5
        val = 0
        syms_left = 3078
        next = 6360627
        lexenv = 0
        count = 2
        i = 0
        optional = false
        rest = false
        previous_optional_or_rest = false
#20 0x000000000060d279 in apply_lambda (fun=9801541, args=52535539, count=1)
    at eval.c:2872
        args_left = 0
        i = 1
        numargs = 1
        arg_vector = 0x7fffd7ffe810
        tem = 22
        sa_avail = 16376
        sa_count = 2
        sa_must_free = false
#21 0x000000000060b71b in eval_sub (form=52535523) at eval.c:2256
        fun = 9801541
        val = 0
        original_fun = 4284672
        original_args = 52535539
        funcar = 140736817260880
        count = 1
        argvals = {0, 28320, 0, 0, 0, 13366928, 13338608, 0}
#22 0x000000000060787a in Fprogn (body=52535987) at eval.c:450
        val = 0
#23 0x000000000060d83e in funcall_lambda (fun=52536019, nargs=0, 
    arg_vector=0x315caf8) at eval.c:3006
        val = 0
        syms_left = 0
        next = 0
        lexenv = 0
        count = 1
        i = 0
        optional = false
        rest = false
        previous_optional_or_rest = false
#24 0x000000000060cb89 in Ffuncall (nargs=1, args=0x315caf0) at eval.c:2749
        fun = 52536019
        original_fun = 52536019
        funcar = 30720
        numargs = 0
        val = 6330469
        count = 0
#25 0x000000000068cc3d in invoke_thread_function () at thread.c:603
        count = 0
#26 0x0000000000609508 in internal_condition_case (
    bfun=0x68cc15 <invoke_thread_function>, handlers=45552, 
    hfun=0x68cc5c <do_nothing>) at eval.c:1336
        val = 5618213
        c = 0x7fffd00009f0
#27 0x000000000068cd60 in run_thread (state=0x315cad0) at thread.c:638
        stack_pos = 0 '\000'
        self = 0x315cad0
        iter = 0x0
#28 0x00007ffff1d8b70a in start_thread (arg=0x7fffd7fff700)
    at pthread_create.c:333
        __res = <optimised out>
        pd = 0x7fffd7fff700
        now = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140736817264384, 
                -5180808803420933133, 0, 140737488339487, 140736817265088, 0, 
                5180756027265577971, 5180813469674042355}, 
              mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#29 0x00007ffff18bd82d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.