bug#34394: 27.0.50; Emacs segfaults with SLY, company and C-g

[João Távora]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: João Távora <joaotavora@gmail.com>
>> Cc: 34394@debbugs.gnu.org,  schwab@linux-m68k.org
>> Date: Sat, 09 Feb 2019 13:23:06 +0000
>> 
>>    (gdb) p globals.f_Vquit_flag 
>>    $3 = XIL(0xc750)
>>    (gdb) xsymbol
>>    $4 = (struct Lisp_Symbol *) 0x555555ce94d0 <lispsym+51024>
>>    "t"
>
> Thanks.  So my theory eats dust.  Hmm...  I wonder if you could come
> up with a simpler reproducer, perhaps in "emacs -nw" (which many times
> tends to make such problems more prominent and simpler to reproduce)?

OK with emacs -nw, and attaching a gdb to the PID I got a new, slightly
different, backtrace, attached.  It now breaks on a SIGINT.

> Removing the need for having SLY or eglot would be a major
> simplification.  Then investigating this could be easier.

Yeah, I understand that.  What do you suggest, though?  I would start by
writing a completion-at-point-function that uses a dummy process?
That's a bit non-trivial, though not impossible, since all the filter,
sentinel and such have to be coded.

But is it so you can reproduce it yourself, or some other reason I'm not
seeing?  I understand it's not the best scenario, but if it's the former
maybe if you could clone SLY to a temp dir, install some common lisp
binary, and run the Emacs -Q recipe I gave you.  It should be all there
is to it (SLY doesn't have any dependencies).

João


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0x00007fe6186084a9 in __pselect (nfds=10, readfds=0x7ffef36a68f0, 
writefds=0x7ffef36a6870, exceptfds=0x0, timeout=<optimized out>, sigmask=0x0) 
at ../sysdeps/unix/sysv/linux/pselect.c:69
69      ../sysdeps/unix/sysv/linux/pselect.c: No such file or directory.
(gdb) c
Continuing.

Program received signal SIGINT, Interrupt.
0x00007fe6186084a9 in __pselect (nfds=10, readfds=0x7ffef36a68f0, 
writefds=0x7ffef36a6870, exceptfds=0x0, timeout=<optimized out>, sigmask=0x0) 
at ../sysdeps/unix/sysv/linux/pselect.c:69
69      in ../sysdeps/unix/sysv/linux/pselect.c
(gdb) where
#0  0x00007fe6186084a9 in __pselect (nfds=10, readfds=0x7ffef36a68f0, 
writefds=0x7ffef36a6870, exceptfds=0x0, timeout=<optimized out>, sigmask=0x0) 
at ../sysdeps/unix/sysv/linux/pselect.c:69
#1  0x00005597df5afc44 in really_call_select (arg=arg@entry=0x7ffef36a6660) at 
thread.c:580
#2  0x00005597df50b8b7 in flush_stack_call_func (func=func@entry=0x5597df5afbf5 
<really_call_select>, arg=arg@entry=0x7ffef36a6660) at alloc.c:5229
#3  0x00005597df5b0fc8 in thread_select (func=<optimized out>, 
max_fds=<optimized out>, rfds=rfds@entry=0x7ffef36a68f0, wfds=<optimized out>, 
efds=efds@entry=0x0, timeout=timeout@entry=0x7ffef36a6850, sigmask=0x0) at 
thread.c:610
#4  0x00005597df586392 in wait_reading_process_output 
(time_limit=time_limit@entry=30, nsecs=nsecs@entry=0, read_kbd=-1, 
do_display=do_display@entry=true, wait_for_cell=..., 
wait_proc=wait_proc@entry=0x0, just_wait_proc=0) at process.c:5420
#5  0x00005597df38e3ac in sit_for (timeout=..., timeout@entry=..., 
reading=reading@entry=true, display_option=display_option@entry=1) at 
lisp.h:1056
#6  0x00005597df4ac209 in read_char (commandflag=1, map=..., map@entry=..., 
prev_event=..., used_mouse_menu=used_mouse_menu@entry=0x7ffef36a6ceb, 
end_time=end_time@entry=0x0) at lisp.h:751
#7  0x00005597df4ad4f5 in read_key_sequence 
(keybuf=keybuf@entry=0x7ffef36a6db0, prompt=..., 
dont_downcase_last=dont_downcase_last@entry=false, 
can_return_switch_frame=can_return_switch_frame@entry=true, 
fix_current_buffer=fix_current_buffer@entry=true, 
prevent_redisplay=prevent_redisplay@entry=false) at keyboard.c:9082
#8  0x00005597df4aebc1 in command_loop_1 () at lisp.h:1056
#9  0x00005597df537a96 in internal_condition_case 
(bfun=bfun@entry=0x5597df4ae943 <command_loop_1>, handlers=..., 
handlers@entry=..., hfun=hfun@entry=0x5597df4a2f6d <cmd_error>) at eval.c:1376
#10 0x00005597df49f494 in command_loop_2 (ignore=..., ignore@entry=...) at 
lisp.h:1056
#11 0x00005597df5379da in internal_catch (tag=..., 
func=func@entry=0x5597df49f478 <command_loop_2>, arg=..., arg@entry=...) at 
eval.c:1139
#12 0x00005597df49c786 in command_loop () at lisp.h:1056
#13 0x00005597df4a2728 in recursive_edit_1 () at keyboard.c:714
#14 0x00005597df4a2cf0 in Frecursive_edit () at keyboard.c:785
#15 0x00005597df49b154 in main (argc=15, argv=<optimized out>) at emacs.c:1949
(gdb) bt full
#0  0x00007fe6186084a9 in __pselect (nfds=10, readfds=0x7ffef36a68f0, 
writefds=0x7ffef36a6870, exceptfds=0x0, timeout=<optimized out>, sigmask=0x0) 
at ../sysdeps/unix/sysv/linux/pselect.c:69
        resultvar = 18446744073709551102
        sc_ret = <optimized out>
        tval = {tv_sec = 0, tv_nsec = 332490737}
        data = {ss = 0, ss_len = 8}
        result = <optimized out>
#1  0x00005597df5afc44 in really_call_select (arg=arg@entry=0x7ffef36a6660) at 
thread.c:580
        sa = 0x7ffef36a6660
        self = 0x5597dfaf7160 <main_thread>
        oldset = {__val = {0, 0, 140732982257232, 94110801452240, 
94110806102771, 94110775600272, 2000000000002, 4000000000002, 140732982257232, 
94110774592060, 1549720307, 94110806102803, 94110801452245, 94110774592778, 
140728898420739, 0}}
#2  0x00005597df50b8b7 in flush_stack_call_func (func=func@entry=0x5597df5afbf5 
<really_call_select>, arg=arg@entry=0x7ffef36a6660) at alloc.c:5229
        end = 0x7ffef36a6650
        self = 0x5597dfaf7160 <main_thread>
        sentry = <optimized out>
#3  0x00005597df5b0fc8 in thread_select (func=<optimized out>, 
max_fds=<optimized out>, rfds=rfds@entry=0x7ffef36a68f0, wfds=<optimized out>, 
efds=efds@entry=0x0, timeout=timeout@entry=0x7ffef36a6850, sigmask=0x0) at 
thread.c:610
        sa = {func = 0x7fe618608450 <__pselect>, max_fds = 10, rfds = 
0x7ffef36a68f0, wfds = 0x7ffef36a6870, efds = 0x0, timeout = 0x7ffef36a6850, 
sigmask = 0x0, result = 0}
#4  0x00005597df586392 in wait_reading_process_output 
(time_limit=time_limit@entry=30, nsecs=nsecs@entry=0, read_kbd=-1, 
do_display=do_display@entry=true, wait_for_cell=..., 
wait_proc=wait_proc@entry=0x0, just_wait_proc=0) at process.c:5420
        process_skipped = false
        channel = <optimized out>
        nfds = <optimized out>
        Available = {fds_bits = {952, 0 <repeats 15 times>}}
        Writeok = {fds_bits = {0 <repeats 16 times>}}
        check_write = true
        check_delay = 1
        no_avail = false
        xerrno = 4
        proc = {i = 0x5597e0b849b5}
        timeout = {tv_sec = 0, tv_nsec = 377736428}
        end_time = <optimized out>
        timer_delay = <optimized out>
        got_output_end_time = <optimized out>
        wait = TIMEOUT
        got_some_output = -1
        prev_wait_proc_nbytes_read = 0
        retry_for_async = false
        count = 3
        now = <optimized out>
#5  0x00005597df38e3ac in sit_for (timeout=..., timeout@entry=..., 
reading=reading@entry=true, display_option=display_option@entry=1) at 
lisp.h:1056
        sec = 30
        nsec = 0
        do_display = true
#6  0x00005597df4ac209 in read_char (commandflag=1, map=..., map@entry=..., 
prev_event=..., used_mouse_menu=used_mouse_menu@entry=0x7ffef36a6ceb, 
end_time=end_time@entry=0x0) at lisp.h:751
        tem0 = <optimized out>
        timeout = 30
        delay_level = <optimized out>
        buffer_size = <optimized out>
        c = {i = 0x0}
        jmpcount = 3
        local_getcjmp = {{__jmpbuf = {0, 8102213443394061389, 94110800974880, 
94110793737392, 140732982259120, 0, 2639951848513324109, 8102158771423396941}, 
__mask_was_saved = 0, __saved_mask = {__val = {94110799899491, 0, 
94110774540917, 3, 0, 4294967295, 3, 94110794482368, 94110774686145, 0, 0, 0, 
17884160, 0, 94110774540917, 8194}}}}
        save_jump = {{__jmpbuf = {0, 0, 0, 0, 0, 0, 0, 0}, __mask_was_saved = 
0, __saved_mask = {__val = {0 <repeats 16 times>}}}}
        tem = <optimized out>
        save = <optimized out>
        previous_echo_area_message = {i = 0x0}
        also_record = {i = 0x0}
        reread = false
        recorded = false
        polling_stopped_here = false
        orig_kboard = 0x5597e06fe160
#7  0x00005597df4ad4f5 in read_key_sequence 
(keybuf=keybuf@entry=0x7ffef36a6db0, prompt=..., 
dont_downcase_last=dont_downcase_last@entry=false, 
can_return_switch_frame=can_return_switch_frame@entry=true, 
fix_current_buffer=fix_current_buffer@entry=true, 
prevent_redisplay=prevent_redisplay@entry=false) at keyboard.c:9082
        interrupted_kboard = 0x5597e06fe160
        interrupted_frame = 0x5597e06e24b0
        key = {i = 0x5597e0dc9420}
        used_mouse_menu = false
        echo_local_start = 0
        last_real_key_start = 0
        keys_local_start = <optimized out>
        new_binding = <optimized out>
        count = 3
        t = 0
        echo_start = 0
        keys_start = 0
        current_binding = <optimized out>
        first_unbound = 31
        mock_input = 0
        used_mouse_menu_history = {false <repeats 30 times>}
        fkey = {parent = {i = 0x5597e06de553}, map = {i = 0x5597e06de553}, 
start = 0, end = 0}
        keytran = {parent = {i = 0x7fe6146095cb}, map = {i = 0x7fe6146095cb}, 
start = 0, end = 0}
        indec = {parent = {i = 0x5597e06de543}, map = {i = 0x5597e06de543}, 
start = 0, end = 0}
        shift_translated = false
        delayed_switch_frame = <optimized out>
        original_uppercase = <optimized out>
        original_uppercase_position = -1
        dummyflag = false
        starting_buffer = 0x5597e0dc9420
        fake_prefixed_keys = <optimized out>
        first_event = <optimized out>
        second_event = <optimized out>
#8  0x00005597df4aebc1 in command_loop_1 () at lisp.h:1056
        cmd = <optimized out>
        keybuf = {{i = 0x50a0}, {i = 0x13e}, {i = 0x10a}, {i = 0x3}, {i = 0x3}, 
{i = 0x5597df538c17 <Ffuncall+684>}, {i = 0x0}, {i = 0x5597e128f203}, {i = 
0x7ffef36a6e70}, {i = 0x2a4e34a6d918}, {i = 0x1}, {i = 0x0}, {i = 0x0}, {i = 
0x5597df53cfae <call3+36>}, {i = 0x2a4e34a6d918}, {i = 0x5597e128f203}, {i = 
0x7fe6140a1f74}, {i = 0x0}, {i = 0x7ffef36a6e70}, {i = 0x5597df4a2f45 
<cmd_error_internal+495>}, {i = 0x0}, {i = 0x5597e128f203}, {i = 0x0}, {i = 
0x5597df4a32bb <cmd_error+846>}, {i = 0x0}, {i = 0x1}, {i = 0x3}, {i = 
0x5597df53782b <push_handler_nosignal+323>}, {i = 0x7fe61460c60b}, {i = 
0x5597e07102e0}}
        i = <optimized out>
        prev_modiff = 44
        prev_buffer = 0x5597e0dc9420
#9  0x00005597df537a96 in internal_condition_case 
(bfun=bfun@entry=0x5597df4ae943 <command_loop_1>, handlers=..., 
handlers@entry=..., hfun=hfun@entry=0x5597df4a2f6d <cmd_error>) at eval.c:1376
        val = {i = 0xfffffffffffffdfe}
        c = 0x5597e07102e0
#10 0x00005597df49f494 in command_loop_2 (ignore=..., ignore@entry=...) at 
lisp.h:1056
        val = <optimized out>
#11 0x00005597df5379da in internal_catch (tag=..., 
func=func@entry=0x5597df49f478 <command_loop_2>, arg=..., arg@entry=...) at 
eval.c:1139
        val = {i = 0xfffffffffffffdfe}
        c = 0x5597e06fe230
#12 0x00005597df49c786 in command_loop () at lisp.h:1056
No locals.
#13 0x00005597df4a2728 in recursive_edit_1 () at keyboard.c:714
        count = 1
        val = <optimized out>
#14 0x00005597df4a2cf0 in Frecursive_edit () at keyboard.c:785
        count = 0
        buffer = <optimized out>
#15 0x00005597df49b154 in main (argc=15, argv=<optimized out>) at emacs.c:1949
        stack_bottom_variable = 0x5597df5ef155 <__libc_csu_init+69>
        do_initial_setlocale = <optimized out>
        no_loadup = false
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x0
        original_pwd = 0x0
        dump_mode = <optimized out>
        skip_args = 1
        temacs = 0x0
        rlim = {rlim_cur = 10022912, rlim_max = 18446744073709551615}
(gdb)