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bug#36609: 27.0.50; Possible race-condition in threading implementation
|
From: |
Andreas Politz |
|
Subject: |
bug#36609: 27.0.50; Possible race-condition in threading implementation |
|
Date: |
Thu, 11 Jul 2019 22:51:10 +0200 |
|
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
I think there is a race-condition in the implementation of threads. I
tried to find a minimal test-case, without success. Thus, I've attached
a lengthy source-file. Loading that file should trigger this bug and
may freeze your session.
Indications:
1. The main-thread has the name of one of created threads (XEmacs in
this case), instead of "emacs".
2. Emacs stops processing all keyboard/mouse input while looping in
wait_reading_process_output. Sending commands via emacsclient still
works.
GDB output:
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7ffff17f5d40 (LWP 26264) "XEmacs" 0x000055555576eac0 in
XPNTR (a=XIL(0x7ffff1312533)) at alloc.c:535
2 Thread 0x7ffff0ac4700 (LWP 26265) "gmain" 0x00007ffff50d1667 in
poll () from /usr/lib/libc.so.6
3 Thread 0x7fffebd1a700 (LWP 26266) "gdbus" 0x00007ffff50d1667 in
poll () from /usr/lib/libc.so.6
4 Thread 0x7fffeb519700 (LWP 26267) "dconf worker" 0x00007ffff50d1667 in
poll () from /usr/lib/libc.so.6
(gdb) bt full
#0 0x00007ffff50d3f76 in pselect () at /usr/lib/libc.so.6
#1 0x0000555555832e48 in really_call_select (arg=0x7fffffffd150) at
thread.c:586
sa = 0x7fffffffd150
self = 0x555555c154e0 <main_thread>
oldset = {
__val = {0, 93825011232085, 140737488343064, 31632, 31632, 51840,
140737488343136, 93824994672716, 4294967298, 140737488343184, 93824999850720,
0, 0, 140737488343136, 93824993869565, 4041340661}
}
#2 0x0000555555774449 in flush_stack_call_func (func=0x555555832d81
<really_call_select>, arg=0x7fffffffd150) at alloc.c:4969
end = 0x7fffffffd100
self = 0x555555c154e0 <main_thread>
sentry = {
o = {
__max_align_ll = 140737488343296,
__max_align_ld = <invalid float value>
}
}
#3 0x0000555555832f40 in thread_select (func=0x7ffff50d3eb0 <pselect>,
max_fds=6, rfds=0x7fffffffd260, wfds=0x7fffffffd2e0, efds=0x0,
timeout=0x7fffffffd8b0, sigmask=0x0) at thread.c:616
sa = {
func = 0x7ffff50d3eb0 <pselect>,
max_fds = 6,
rfds = 0x7fffffffd260,
wfds = 0x7fffffffd2e0,
efds = 0x0,
timeout = 0x7fffffffd8b0,
sigmask = 0x0,
result = 210347336
}
#4 0x000055555585fea3 in xg_select (fds_lim=6, rfds=0x7fffffffd920,
wfds=0x7fffffffd9a0, efds=0x0, timeout=0x7fffffffd8b0, sigmask=0x0) at
xgselect.c:117
all_rfds = {
fds_bits = {32, 0 <repeats 15 times>}
}
all_wfds = {
fds_bits = {0 <repeats 16 times>}
}
tmo = {
tv_sec = 7,
tv_nsec = 140737488343264
}
tmop = 0x7fffffffd8b0
context = 0x555555dae320
have_wfds = true
gfds_buf = {{
fd = 0,
events = 0,
revents = 0
}, {
fd = 32,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 7,
events = 0,
revents = 0
}, {
fd = 8,
events = 0,
revents = 0
}, {
fd = 15,
events = 0,
revents = 0
}, {
fd = -11072,
events = 32767,
revents = 0
}, {
fd = 1460278864,
events = 21845,
revents = 0
}, {
fd = 64,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 2,
events = 48,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 91,
events = 124,
revents = 0
}, {
fd = -397131776,
events = 35414,
revents = 11125
}, {
fd = 1460278864,
events = 21845,
revents = 0
}, {
fd = 1,
events = 0,
revents = 0
}, {
fd = 2,
events = 0,
revents = 0
}, {
fd = -11072,
events = 32767,
revents = 0
}, {
fd = 1439161536,
events = 21845,
revents = 0
}, {
fd = -11024,
events = 32767,
revents = 0
}, {
fd = -11088,
events = 32767,
revents = 0
}, {
fd = -182671191,
events = 32767,
revents = 0
}, {
fd = 1,
events = 0,
revents = 0
}, {
fd = -182670875,
events = 32767,
revents = 0
}, {
fd = 194871296,
events = 59160,
revents = 48198
}, {
fd = -1175563804,
events = 19,
revents = 0
}, {
fd = 24,
events = 0,
revents = 0
}, {
fd = 1460278864,
events = 21845,
revents = 0
}, {
fd = 2,
events = 0,
revents = 0
}, {
fd = 1439882448,
events = 21845,
revents = 0
}, {
fd = 2,
events = 0,
revents = 0
}, {
fd = 2,
events = 0,
revents = 0
}, {
fd = 1,
events = 2,
revents = 0
}, {
fd = 1460278864,
events = 21845,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = -397131776,
events = 35414,
revents = 11125
}, {
fd = 24,
events = 0,
revents = 0
}, {
fd = 1439161536,
events = 21845,
revents = 0
}, {
fd = 2,
events = 0,
revents = 0
}, {
fd = 1,
events = 0,
revents = 0
}, {
fd = 1439161536,
events = 21845,
revents = 0
}, {
fd = -182606722,
events = 32767,
revents = 0
}, {
fd = -10960,
events = 32767,
revents = 0
}, {
fd = 1433487750,
events = 21845,
revents = 0
}, {
fd = -10976,
events = 32767,
revents = 0
}, {
fd = 1439161536,
events = 21845,
revents = 0
}, {
fd = -30,
events = 0,
revents = 0
}, {
fd = 1,
events = 0,
revents = 0
}, {
fd = 1,
events = 64,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 31,
events = 0,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = -10960,
events = 32767,
revents = 0
}, {
fd = 1434542700,
events = 21845,
revents = 0
}, {
fd = -10912,
events = 32767,
revents = 0
}, {
fd = 1439161536,
events = 21845,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = -397131776,
events = 35414,
revents = 11125
}, {
fd = -10848,
events = 32767,
revents = 0
}, {
fd = 1434543288,
events = 21845,
revents = 0
}, {
fd = 1460274293,
events = 21845,
revents = 0
}, {
fd = 1385447426,
events = 931,
revents = 0
}, {
fd = 95390,
events = 0,
revents = 0
}, {
fd = 1433865373,
events = 7256,
revents = 10134
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 1439161536,
events = 21845,
revents = 0
}, {
fd = 664149,
events = 0,
revents = 0
}, {
fd = 80000,
events = 0,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 664149080,
events = 0,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 664149080,
events = 0,
revents = 0
}, {
fd = -10752,
events = 32767,
revents = 0
}, {
fd = 1434543494,
events = 21845,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = -10544,
events = 32767,
revents = 0
}, {
fd = 499622378,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 499622378,
events = 0,
revents = 0
}, {
fd = -10688,
events = 32767,
revents = 0
}, {
fd = 1434939197,
events = 21845,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 164526702,
events = 0,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 664149080,
events = 0,
revents = 0
}, {
fd = -10544,
events = 32767,
revents = 0
}, {
fd = 499622378,
events = 41450,
revents = 7623
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = -1,
events = 65535,
revents = 65535
}, {
fd = -10432,
events = 32767,
revents = 0
}, {
fd = 1433359581,
events = 21845,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 1443725184,
events = 85,
revents = 0
}, {
fd = 1450650965,
events = 21845,
revents = 0
}, {
fd = 1450650965,
events = 21845,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 16384,
events = 0,
revents = 0
}, {
fd = 5,
events = 0,
revents = 0
}, {
fd = -10496,
events = 32767,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = -1,
events = 65535,
revents = 65535
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 164526702,
events = 0,
revents = 0
}, {
fd = 719,
events = 0,
revents = 0
}, {
fd = 893997157,
events = 0,
revents = 0
}, {
fd = 1439269600,
events = 21845,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = -10496,
events = 32767,
revents = 0
}, {
fd = 1433288445,
events = 21845,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 164532384,
events = 0,
revents = 0
}, {
fd = 1562977925,
events = 0,
revents = 0
}, {
fd = 1562977925,
events = 0,
revents = 0
}, {
fd = 164532384,
events = 0,
revents = 0
}, {
fd = -10368,
events = 32767,
revents = 0
}, {
fd = 1434938909,
events = 21845,
revents = 0
}, {
fd = 100000,
events = 0,
revents = 0
}, {
fd = 0,
events = 0,
revents = 0
}, {
fd = 1562877925,
events = 0,
revents = 0
}, {
fd = 164532384,
events = 0,
revents = 0
}, {
fd = -1,
events = 65535,
revents = 65535
}, {
fd = 0,
events = 0,
revents = 0
}}
gfds = 0x7fffffffd360
gfds_size = 128
n_gfds = -1
retval = 0
our_fds = 0
max_fds = 5
context_acquired = false
i = 0
nfds = 135
tmo_in_millisec = 1030
must_free = 0
need_to_dispatch = false
#5 0x0000555555802a78 in wait_reading_process_output (time_limit=0, nsecs=0,
read_kbd=-1, do_display=true, wait_for_cell=XIL(0), wait_proc=0x0,
just_wait_proc=0) at process.c:5423
process_skipped = false
channel = 6
nfds = 1
Available = {
fds_bits = {32, 0 <repeats 15 times>}
}
Writeok = {
fds_bits = {0 <repeats 16 times>}
}
check_write = true
check_delay = 0
no_avail = false
xerrno = 11
proc = XIL(0x7fffffffd9a0)
timeout = {
tv_sec = 0,
tv_nsec = 499622378
}
end_time = {
tv_sec = 93824993869565,
tv_nsec = 0
}
timer_delay = {
tv_sec = 0,
tv_nsec = 499622378
}
got_output_end_time = {
tv_sec = 1562977205,
tv_nsec = 270561059
}
wait = FOREVER
got_some_output = -1
prev_wait_proc_nbytes_read = 0
retry_for_async = false
count = 4
now = {
tv_sec = 0,
tv_nsec = -1
}
#6 0x00005555556f4718 in kbd_buffer_get_event (kbp=0x7fffffffdc70,
used_mouse_menu=0x7fffffffe235, end_time=0x0) at keyboard.c:3836
do_display = true
obj = make_fixnum(1073741816)
#7 0x00005555556f06c5 in read_event_from_main_queue (end_time=0x0,
local_getcjmp=0x7fffffffe040, used_mouse_menu=0x7fffffffe235) at keyboard.c:2138
c = XIL(0)
save_jump = {{
__jmpbuf = {0, 0, 0, 0, 0, 0, 0, 0},
__mask_was_saved = 0,
__saved_mask = {
__val = {0 <repeats 16 times>}
}
}}
kb = 0x7fffffffdcd0
count = 3
#8 0x00005555556f099b in read_decoded_event_from_main_queue (end_time=0x0,
local_getcjmp=0x7fffffffe040, prev_event=XIL(0),
used_mouse_menu=0x7fffffffe235) at keyboard.c:2202
nextevt = XIL(0)
frame = 0x1dcd30d9
terminal = 0x9
events = {XIL(0), XIL(0x1dcd30d9), XIL(0xca80),
XIL(0x2b758a56e8544000), XIL(0), XIL(0x555556772ff5), XIL(0x7fffffffde50),
XIL(0x5555556f57d8), XIL(0x555555c982e0), XIL(0), XIL(0), XIL(0x7fffffffde50),
XIL(0x5555556e3efd), XIL(0x1dcd30d9), XIL(0x7fffffffde90), XIL(0x5555556f3b29)}
n = 0
#9 0x00005555556f2236 in read_char (commandflag=1, map=XIL(0x5555567756e3),
prev_event=XIL(0), used_mouse_menu=0x7fffffffe235, end_time=0x0) at
keyboard.c:2810
c = XIL(0)
jmpcount = 3
local_getcjmp = {{
__jmpbuf = {0, -245616553674816983, 93825011232757, 51840, 0, 0,
-245616553305718231, -6214351577293929943},
__mask_was_saved = 0,
__saved_mask = {
__val = {0, 0, 140737488347312, 93824993869565, 0,
140737488347424, 93824994673374, 93825011242707, 3, 0, 0, 140737488347424,
93824994446493, 93824999850720, 0, 0}
}
}}
save_jump = {{
__jmpbuf = {93824993869565, 0, 140737488347584, 93824994020698, 0,
51840, -1, 0},
__mask_was_saved = 1450661587,
__saved_mask = {
__val = {93825011242723, 140737488347520, 93824993870282,
93825011242707, 93825011242723, 140737488347584, 93824994446493,
93824999885184, 34464, 34464, 140737488347584, 93824993869565, 40105367251,
93825004306304, 140737488347624, 93824999850720}
}
}}
tem = XIL(0x2aaa9b29c970)
save = XIL(0)
previous_echo_area_message = XIL(0)
also_record = XIL(0)
reread = false
recorded = false
polling_stopped_here = true
orig_kboard = 0x555555dfa570
#10 0x00005555556ff6c8 in read_key_sequence (keybuf=0x7fffffffe440,
prompt=XIL(0), dont_downcase_last=false, can_return_switch_frame=true,
fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9124
interrupted_kboard = 0x555555dfa570
interrupted_frame = 0x5555560d7f80
key = XIL(0x5555557a7eff)
used_mouse_menu = false
echo_local_start = 0
last_real_key_start = 0
keys_local_start = 0
new_binding = XIL(0x7fffffffe310)
count = 3
t = 0
echo_start = 0
keys_start = 0
current_binding = XIL(0x5555567756e3)
first_unbound = 31
mock_input = 0
used_mouse_menu_history = {false <repeats 30 times>}
fkey = {
parent = XIL(0x555555d6ce03),
map = XIL(0x555555d6ce03),
start = 0,
end = 0
}
keytran = {
parent = XIL(0x7ffff14a7dbb),
map = XIL(0x7ffff14a7dbb),
start = 0,
end = 0
}
indec = {
parent = XIL(0x555555d6cdf3),
map = XIL(0x555555d6cdf3),
start = 0,
end = 0
}
shift_translated = false
delayed_switch_frame = XIL(0)
original_uppercase = XIL(0)
original_uppercase_position = -1
dummyflag = false
starting_buffer = 0x7ffff0e1f6f0
fake_prefixed_keys = XIL(0)
first_event = XIL(0)
second_event = XIL(0)
#11 0x00005555556ee5fb in command_loop_1 () at keyboard.c:1348
cmd = XIL(0)
keybuf = {XIL(0x7fffffffe490), XIL(0x5555557a804c),
make_fixnum(11545945833472), XIL(0x7fffffffe4c0), XIL(0x555555c982e0), XIL(0),
XIL(0), XIL(0x7fffffffe490), XIL(0x5555556e3efd), XIL(0xf0e1f6f5),
XIL(0x7fffffffe500), make_fixnum(23456248668343), XIL(0x555555d18953),
XIL(0x3), XIL(0x555555c982e0), XIL(0), XIL(0), XIL(0x7fffffffe4e0),
XIL(0x5555556e3efd), XIL(0xf0e1f6f5), XIL(0x7fffffffe520), XIL(0x5555557a2e69),
XIL(0x1556e3efd), XIL(0x5760), XIL(0x7fffffffe540), XIL(0x555555d53470),
XIL(0), XIL(0), XIL(0x7fffffffe550), make_fixnum(23456248662876)}
i = 32767
prev_modiff = 0
prev_buffer = 0x0
already_adjusted = false
#12 0x00005555557a2a64 in internal_condition_case (bfun=0x5555556ee1b3
<command_loop_1>, handlers=XIL(0x5760), hfun=0x5555556ed968 <cmd_error>) at
eval.c:1351
val = XIL(0x5555556e3efd)
c = 0x555555d53470
#13 0x00005555556ede9b in command_loop_2 (ignore=XIL(0)) at keyboard.c:1091
val = XIL(0)
#14 0x00005555557a22d5 in internal_catch (tag=XIL(0xd110), func=0x5555556ede6e
<command_loop_2>, arg=XIL(0)) at eval.c:1112
val = XIL(0x45b00000000)
c = 0x555555d53340
#15 0x00005555556ede39 in command_loop () at keyboard.c:1070
#16 0x00005555556ed537 in recursive_edit_1 () at keyboard.c:714
count = 1
val = make_fixnum(23456248667937)
#17 0x00005555556ed6bb in Frecursive_edit () at keyboard.c:786
count = 0
buffer = XIL(0)
#18 0x00005555556eb49d in main (argc=4, argv=0x7fffffffe8b8) at emacs.c:2086
stack_bottom_variable = 0x20
do_initial_setlocale = true
no_loadup = false
junk = 0x0
dname_arg = 0x0
ch_to_dir = 0x0
original_pwd = 0x0
dump_mode = 0x0
skip_args = 0
temacs = 0x0
attempt_load_pdump = true
rlim = {
rlim_cur = 10022912,
rlim_max = 18446744073709551615
}
sockfd = -1
thread-bug-2.el
Description: thread-bug-2.el
- bug#36609: 27.0.50; Possible race-condition in threading implementation,
Andreas Politz <=
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Eli Zaretskii, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Pip Cet, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Eli Zaretskii, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Pip Cet, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Eli Zaretskii, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Pip Cet, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Eli Zaretskii, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Pip Cet, 2019/07/12
- bug#36609: 27.0.50; Possible race-condition in threading implementation, Eli Zaretskii, 2019/07/12