This is the second test case. In this case, Emacs didn't crash when I ran the test case and everything seemed to be working properly. I then ran the test case several times in quick succession to get a lot more threads and eventually, after I had tried to create 100 more threads and running out of resources (I got an error suggesting that was the case) and I was about to exit Emacs, it crashed.
Here is the backtrace from that session:
PID: 30950 (emacs)
UID: 50067 (emartenson)
GID: 50067 (emartenson)
Signal: 6 (ABRT)
Timestamp: Wed 2016-12-14 10:56:06 SGT (6min ago)
Command Line: dist/bin/emacs -Q
Executable: /home/emartenson/src/emacs/dist/bin/emacs-26.0.50
Control Group: /system.slice/system-getty.slice/getty@tty1.service
Unit: getty@tty1.service
Slice: system-getty.slice
Boot ID: 45a62f2ad9804a0b81fed25ad8faffab
Machine ID: 50467f3a69eb4dbea19c8a2972949839
Hostname: em-desktop
Storage: /var/lib/systemd/coredump/core.emacs.50067.45a62f2ad9804a0b81fed25ad
8faffab.30950.1481684166000000000000.lz4
Message: Process 30950 (emacs) of user 50067 dumped core.
Stack trace of thread 30950:
#0 0x00007fef6f9ddf5f raise (libpthread.so.0)
#1 0x0000000000553ac0 terminate_due_to_signal (emacs-26.0.50)
#2 0x0000000000578227 handle_fatal_signal (emacs-26.0.50)
#3 0x00000000005781f8 deliver_thread_signal (emacs-26.0.50)
#4 0x000000000057825e deliver_fatal_thread_signal (emacs-26.0.50)
#5 0x00007fef6f9de080 __restore_rt (libpthread.so.0)
#6 0x00007fef6f23004f raise (libc.so.6)
#7 0x00007fef6f23147a abort (libc.so.6)
#8 0x00007fef6f228ea7 __assert_fail_base (libc.so.6)
#9 0x00007fef6f228f52 __assert_fail (libc.so.6)
#10 0x00007fef74262c4a n/a (libX11.so.6)
#11 0x00007fef74262cfb n/a (libX11.so.6)
#12 0x00007fef74262fed _XEventsQueued (libX11.so.6)
#13 0x00007fef74254cb7 XPending (libX11.so.6)
#14 0x00007fef760c2cde n/a (libgdk-3.so.0)
#15 0x00007fef749cec89 g_main_context_prepare (libglib-2.0.so.0)
#16 0x00007fef749cf6ab n/a (libglib-2.0.so.0)
#17 0x00007fef749cf847 g_main_context_pending (libglib-2.0.so.0)
#18 0x00007fef7657ecad gtk_events_pending (libgtk-3.so.0)
#19 0x000000000051fc12 XTread_socket (emacs-26.0.50)
#20 0x0000000000563d58 gobble_input (emacs-26.0.50)
#21 0x00000000005641f1 handle_async_input (emacs-26.0.50)
#22 0x0000000000564210 process_pending_signals (emacs-26.0.50)
#23 0x00000000005d1812 Fmake_list (emacs-26.0.50)
#24 0x00000000005fefa5 concat (emacs-26.0.50)
#25 0x00000000005fe9a6 Fcopy_sequence (emacs-26.0.50)
#26 0x000000000055f400 timer_check (emacs-26.0.50)
#27 0x000000000055d258 readable_events (emacs-26.0.50)
#28 0x0000000000563ba1 get_input_pending (emacs-26.0.50)
#29 0x0000000000569d9b detect_input_pending_run_timers (emacs-26.0.5
0)
#30 0x000000000064dde6 wait_reading_process_output (emacs-26.0.50)
#31 0x000000000042516e sit_for (emacs-26.0.50)
#32 0x000000000055baae read_char (emacs-26.0.50)
#33 0x000000000056857a read_key_sequence (emacs-26.0.50)
#34 0x000000000055879f command_loop_1 (emacs-26.0.50)
#35 0x00000000005f628a internal_condition_case (emacs-26.0.50)
#36 0x0000000000558098 command_loop_2 (emacs-26.0.50)
#37 0x00000000005f5b57 internal_catch (emacs-26.0.50)
#38 0x000000000055803a command_loop (emacs-26.0.50)
#39 0x0000000000557756 recursive_edit_1 (emacs-26.0.50)
#40 0x00000000005578d2 Frecursive_edit (emacs-26.0.50)
#41 0x00000000005556cd main (emacs-26.0.50)
#42 0x00007fef6f21d291 __libc_start_main (libc.so.6)
#43 0x000000000041846a _start (emacs-26.0.50)
Stack trace of thread 30952:
#0 0x00007fef6f2dc48d poll (libc.so.6)
#1 0x00007fef749cf786 n/a (libglib-2.0.so.0)
#2 0x00007fef749cfb12 g_main_loop_run (libglib-2.0.so.0)
#3 0x00007fef74fb5316 n/a (libgio-2.0.so.0)
#4 0x00007fef749f70d5 n/a (libglib-2.0.so.0)
#5 0x00007fef6f9d4454 start_thread (libpthread.so.0)
#6 0x00007fef6f2e57df __clone (libc.so.6)
Stack trace of thread 30951:
#0 0x00007fef6f2dc48d poll (libc.so.6)
#1 0x00007fef749cf786 n/a (libglib-2.0.so.0)
#2 0x00007fef749cf89c g_main_context_iteration (libglib-2.0.so.0)
#3 0x00007fef749cf8e1 n/a (libglib-2.0.so.0)
#4 0x00007fef749f70d5 n/a (libglib-2.0.so.0)
#5 0x00007fef6f9d4454 start_thread (libpthread.so.0)
#6 0x00007fef6f2e57df __clone (libc.so.6)
Stack trace of thread 30953:
#0 0x00007fef6f2dc48d poll (libc.so.6)
#1 0x00007fef749cf786 n/a (libglib-2.0.so.0)
#2 0x00007fef749cf89c g_main_context_iteration (libglib-2.0.so.0)
#3 0x00007fef65f434bd n/a (libdconfsettings.so)
#4 0x00007fef749f70d5 n/a (libglib-2.0.so.0)
#5 0x00007fef6f9d4454 start_thread (libpthread.so.0)
#6 0x00007fef6f2e57df __clone (libc.so.6)
GNU gdb (GDB) 7.12
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Type "show configuration" for configuration details.
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Reading symbols from /home/emartenson/src/emacs/dist/bin/emacs-26.0.50...done.
warning: core file may not match specified executable file.
[New LWP 30950]
[New LWP 30952]
[New LWP 30951]
[New LWP 30953]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `dist/bin/emacs -Q'.
Program terminated with signal SIGABRT, Aborted.
#0 0x00007fef6f9ddf5f in raise () from /usr/lib/libpthread.so.0
[Current thread is 1 (Thread 0x7fef778cba00 (LWP 30950))]
(gdb) bt full
#0 0x00007fef6f9ddf5f in raise () at /usr/lib/libpthread.so.0
#1 0x0000000000553ac0 in terminate_due_to_signal (sig=6, backtrace_limit=40)
at emacs.c:396
#2 0x0000000000578227 in handle_fatal_signal (sig=6) at sysdep.c:1685
#3 0x00000000005781f8 in deliver_thread_signal (sig=6, handler=0x57820d <handle_fat
al_signal>) at sysdep.c:1659
old_errno = 11
#4 0x000000000057825e in deliver_fatal_thread_signal (sig=6) at sysdep.c:1697
#5 0x00007fef6f9de080 in <signal handler called> () at /usr/lib/libpthread.so.0
#6 0x00007fef6f23004f in raise () at /usr/lib/libc.so.6
#7 0x00007fef6f23147a in abort () at /usr/lib/libc.so.6
#8 0x00007fef6f228ea7 in __assert_fail_base () at /usr/lib/libc.so.6
#9 0x00007fef6f228f52 in () at /usr/lib/libc.so.6
#10 0x00007fef74262c4a in () at /usr/lib/libX11.so.6
#11 0x00007fef74262cfb in () at /usr/lib/libX11.so.6
#12 0x00007fef74262fed in _XEventsQueued () at /usr/lib/libX11.so.6
#13 0x00007fef74254cb7 in XPending () at /usr/lib/libX11.so.6
#14 0x00007fef760c2cde in () at /usr/lib/libgdk-3.so.0
#15 0x00007fef749cec89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#16 0x00007fef749cf6ab in () at /usr/lib/libglib-2.0.so.0
#17 0x00007fef749cf847 in g_main_context_pending () at /usr/lib/libglib-2.0.so.0
#18 0x00007fef7657ecad in gtk_events_pending () at /usr/lib/libgtk-3.so.0
#19 0x000000000051fc12 in XTread_socket (terminal=0x123de40 <bss_sbrk_buffer+5752160
>, hold_quit=0x7ffe6b540fc0) at xterm.c:8897
count = 0
event_found = false
dpyinfo = 0x471cd50
#20 0x0000000000563d58 in gobble_input () at keyboard.c:6880
nr = 0
hold_quit =
{kind = NO_EVENT, part = scroll_bar_nowhere, code = 0, modifiers = 0, x =
0, y = 0, timestamp = 0, frame_or_window = 0, arg = 0}
next = 0x0
nread = 0
err = false
t = 0x123de40 <bss_sbrk_buffer+5752160>
#21 0x00000000005641f1 in handle_async_input () at keyboard.c:7135
nread = 32766
#22 0x0000000000564210 in process_pending_signals () at keyboard.c:7149
#23 0x00000000005d1812 in Fmake_list (length=0, init=0) at alloc.c:2913
val = 75342771
size = 0
#24 0x00000000005fefa5 in concat (nargs=1, args=0x7ffe6b541208, target_type=
Lisp_Cons, last_special=false) at fns.c:680
val = 13375328
tail = 0
this = 22175315
toindex = 1481684167
toindex_byte = 0
result_len = 1
result_len_byte = 1
argnum = 1
last_tail = 0
prev = 5568549
some_multibyte = false
textprops = 0x0
num_textprops = 0
sa_avail = 16384
sa_count = 4
sa_must_free = false
#25 0x00000000005fe9a6 in Fcopy_sequence (arg=22175315) at fns.c:548
#26 0x000000000055f400 in timer_check () at keyboard.c:4514
nexttime = {tv_sec = 140730699092560, tv_nsec = 13375328}
timers = 0
idle_timers = 140730699096416
tem = 0
#27 0x000000000055d258 in readable_events (flags=1) at keyboard.c:3345
#28 0x0000000000563ba1 in get_input_pending (flags=1) at keyboard.c:6795
#29 0x0000000000569d9b in detect_input_pending_run_timers (do_display=true)
---Type <return> to continue, or q <return> to quit---
at keyboard.c:9935
old_timers_run = 104
#30 0x000000000064dde6 in wait_reading_process_output (time_limit=30, nsecs=0, read_
kbd=-1, do_display=true, wait_for_cell=0, wait_proc=0x0, just_wait_proc=0)
at process.c:5476
old_timers_run = 104
old_buffer = 0x48b2800
old_window = 19844149
leave = false
process_skipped = false
channel = 1024
nfds = 1
Available = {fds_bits = {64, 0 <repeats 15 times>}}
Writeok = {fds_bits = {0 <repeats 16 times>}}
check_write = true
check_delay = 0
no_avail = false
xerrno = 11
proc = 140730699093664
timeout = {tv_sec = 0, tv_nsec = 0}
end_time = {tv_sec = 1481684190, tv_nsec = 754967307}
timer_delay = {tv_sec = 0, tv_nsec = 499151921}
got_output_end_time = {tv_sec = 1481684190, tv_nsec = 754967307}
wait = TIMEOUT
got_some_output = -1
retry_for_async = false
count = 3
now = {tv_sec = 0, tv_nsec = -1}
#31 0x000000000042516e in sit_for (timeout=122, reading=true, display_option=1)
at dispnew.c:5763
sec = 30
nsec = 0
do_display = true
#32 0x000000000055baae in read_char (commandflag=1, map=21961475, prev_event=0, used
_mouse_menu=0x7ffe6b541aff, end_time=0x0) at keyboard.c:2722
tem0 = 5568549
timeout = 30
delay_level = 4
buffer_size = 3
c = 0
jmpcount = 3
local_getcjmp =
{{__jmpbuf = {0, 1990301376317110879, 4293696, 140730699096416, 0, 0
, 1990301376688306783, -1989976898492548513}, __mask_was_saved = 0, __saved_mask = {
__val = {13648768, 13233360, 6139553, 0, 140730699094336, 5568549, 18271280, 1323336
0, 5703494, 0, 140730699094384, 5568549, 19964883, 140730699094480, 6272103, 0}}}}
save_jump =
{{__jmpbuf = {0, 1999463896344836703, 0, 30, 0, 140666480590848, 199
9463894568548959, -1989976898492548513}, __mask_was_saved = 0, __saved_mask = {__val
= {80, 0, 4098007, 0, 500000000, 0, 9223372036854775807, 0, 495901993, 0, 91783517,
140663768982032, 5632523, 21931219, 15478450176544054016, 0}}}}
tem = 21961475
save = 0
previous_echo_area_message = 0
also_record = 0
reread = false
recorded = false
polling_stopped_here = false
orig_kboard = 0x46f9900
#33 0x000000000056857a in read_key_sequence (keybuf=0x7ffe6b541cb0, bufsize=30, prom
pt=0, dont_downcase_last=false, can_return_switch_frame=true, fix_current_buffer=tru
e, prevent_redisplay=false) at keyboard.c:9136
interrupted_kboard = 0x46f9900
interrupted_frame = 0x12ebc30 <bss_sbrk_buffer+6464336>
key = 4544753
used_mouse_menu = false
echo_local_start = 0
last_real_key_start = 0
keys_local_start = 0
---Type <return> to continue, or q <return> to quit---
new_binding = 5
count = 3
t = 0
echo_start = 0
keys_start = 0
current_binding = 21961475
first_event = 0
first_unbound = 31
mock_input = 0
fkey = {parent = 17969043, map = 17969043, start = 0, end = 0}
keytran = {parent = 13711939, map = 13711939, start = 0, end = 0}
indec = {parent = 17969059, map = 17969059, start = 0, end = 0}
shift_translated = false
delayed_switch_frame = 0
original_uppercase = 0
original_uppercase_position = -1
dummyflag = false
starting_buffer = 0x48b2800
fake_prefixed_keys = 0
#34 0x000000000055879f in command_loop_1 () at keyboard.c:1373
cmd = 140730699095552
keybuf =
{140730699095312, 6264856, 140730699095360, 4, 140730699095296, 515936, 3,
3, 0, 9555221, 140730699095360, 0, 140730699095392, 6263156, 0, 9567684, 13233360,
515936, 0, 140730699095392, 5568549, 0, 13233360, 5602788, 13233360, 140730699095440
, 0, 140730699095456, 5568549, 5602591}
i = 1
prev_modiff = 0
prev_buffer = 0x0
already_adjusted = false
#35 0x00000000005f628a in internal_condition_case (bfun=0x55838e <command_loop_1>, h
andlers=19680, hfun=0x557b7b <cmd_error>) at eval.c:1336
val = 5568549
c = 0x45c0290
#36 0x0000000000558098 in command_loop_2 (ignore=0) at keyboard.c:1115
val = 2
#37 0x00000000005f5b57 in internal_catch (tag=47088, func=0x55806f <command_loop_2>,
arg=0) at eval.c:1101
val = 5568549
c = 0x45c0160
#38 0x000000000055803a in command_loop () at keyboard.c:1094
#39 0x0000000000557756 in recursive_edit_1 () at keyboard.c:700
count = 1
val = 140730699095856
#40 0x00000000005578d2 in Frecursive_edit () at keyboard.c:771
count = 0
buffer = 0
#41 0x00000000005556cd in main (argc=2, argv=0x7ffe6b542168) at emacs.c:1691
stack_bottom_variable = 0 '\000'
do_initial_setlocale = true
dumping = false
skip_args = 0
no_loadup = false
junk = 0x0
dname_arg = 0x0
ch_to_dir = 0x0
original_pwd = 0x0
disable_aslr = false
rlim = {rlim_cur = 8720384, rlim_max = 18446744073709551615}
sockfd = -1