Re: branch master segfault (2019-02-05)

[Philippe Vaucher <philippe.vaucher@gmail.com>]

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>
> > Here attached you'll find the gdb trace and a strace log. I tried to
> build the image with debug flags using what's
> > in DEBUG, but the errors are similar.
> >
> > I know that recently the portable dumper branch was merged, I suspect it
> has to do with the segfault... If
> > necessary, I can bisect to find the offending commit, but I was hoping
> someone would quickly know what is
> > happening.
> >
> > This happens even if I run the container in privileged mode.
>
> Thanks.  Could you please show the Lisp backtrace as well, using the
> "xbacktrace" command defined on src/.gdbinit?
>

Here attached you'll find the whole gdb session.


> Also, does this happen when Emacs is invoked as "emacs -Q"?
>

Yes it does.

Thanks,
Philippe

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GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./emacs...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
Environment variable "DISPLAY" not defined.
TERM = xterm
Breakpoint 1 at 0x1c15b0: file emacs.c, line 370.
Temporary breakpoint 2 at 0x1ef231: file sysdep.c, line 1095.
(gdb) run
Starting program: /opt/emacs/src/emacs 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe5120700 (LWP 8470)]

Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in  ()
#1  0x0000555555678d15 in encode_coding (coding=0x555555feaba0 <safe_terminal_coding>) at coding.c:7777
#2  0x000055555567affb in encode_coding_object (coding=0x555555feaba0 <safe_terminal_coding>, src_object=XIL(0), from=0, from_byte=0, to=13, to_byte=13, dst_object=XIL(0)) at coding.c:8355
#3  0x00005555556a1f4f in encode_terminal_code (src=0x7ffff7fb2430, src_len=13, coding=0x555555feaba0 <safe_terminal_coding>) at term.c:714
#4  0x00005555556a226b in tty_write_glyphs (f=0x555556073490, string=0x7ffff7fb21c0, len=211) at term.c:775
#5  0x00005555556acfb7 in write_glyphs (f=0x555556073490, string=0x7ffff7fb21c0, len=211) at terminal.c:165
#6  0x000055555559bfaf in update_frame_line (f=0x555556073490, vpos=51, updating_menu_p=false) at dispnew.c:4854
#7  0x000055555559b148 in update_frame_1 (f=0x555556073490, force_p=true, inhibit_id_p=true, set_cursor_p=true, updating_menu_p=false) at dispnew.c:4546
#8  0x0000555555597543 in update_frame (f=0x555556073490, force_p=true, inhibit_hairy_id_p=true) at dispnew.c:3123
#9  0x00005555555df653 in echo_area_display (update_frame_p=true) at xdisp.c:11726
#10 0x00005555555dc57c in message3_nolog (m=XIL(0x5555560711f4)) at xdisp.c:10667
#11 0x00005555555dc20d in message3 (m=XIL(0x5555560711f4)) at xdisp.c:10596
#12 0x00005555557d8c79 in Fmessage (nargs=2, args=0x7fffffffc270) at editfns.c:2809
#13 0x00005555557e9536 in funcall_subr (subr=0x555555f715a0 <Smessage>, numargs=2, args=0x7fffffffc270) at eval.c:2915
#14 0x00005555557e914f in Ffuncall (nargs=3, args=0x7fffffffc268) at eval.c:2860
#15 0x000055555583df37 in exec_byte_code (bytestr=XIL(0x7fffe5e92954), vector=XIL(0x7fffe5e927fd), maxdepth=make_number(8), args_template=make_number(0), nargs=0, args=0x7fffffffc758) at bytecode.c:633
#16 0x00005555557e9d80 in funcall_lambda (fun=XIL(0x7fffe5e927d5), nargs=0, arg_vector=0x7fffffffc758) at eval.c:3058
#17 0x00005555557e9193 in Ffuncall (nargs=1, args=0x7fffffffc750) at eval.c:2862
#18 0x000055555583df37 in exec_byte_code (bytestr=XIL(0x7fffe5e92994), vector=XIL(0x7fffe5e91755), maxdepth=make_number(23), args_template=make_number(257), nargs=1, args=0x7fffffffd0d8) at bytecode.c:633
#19 0x00005555557e9d80 in funcall_lambda (fun=XIL(0x7fffe5e91725), nargs=1, arg_vector=0x7fffffffd0d0) at eval.c:3058
#20 0x00005555557e9193 in Ffuncall (nargs=2, args=0x7fffffffd0c8) at eval.c:2862
#21 0x000055555583df37 in exec_byte_code (bytestr=XIL(0x7fffe5e9639c), vector=XIL(0x7fffe5e92bd5), maxdepth=make_number(12), args_template=make_number(0), nargs=0, args=0x7fffffffdbd8) at bytecode.c:633
#22 0x00005555557e9d80 in funcall_lambda (fun=XIL(0x7fffe5e92ba5), nargs=0, arg_vector=0x7fffffffdbd8) at eval.c:3058
#23 0x00005555557e9193 in Ffuncall (nargs=1, args=0x7fffffffdbd0) at eval.c:2862
#24 0x000055555583df37 in exec_byte_code (bytestr=XIL(0x7fffe5e96fec), vector=XIL(0x7fffe5e9656d), maxdepth=make_number(12), args_template=make_number(0), nargs=0, args=0x7fffffffe1b0) at bytecode.c:633
#25 0x00005555557e9d80 in funcall_lambda (fun=XIL(0x7fffe5e9653d), nargs=0, arg_vector=0x7fffffffe1b0) at eval.c:3058
#26 0x00005555557e99eb in apply_lambda (fun=XIL(0x7fffe5e9653d), args=XIL(0), count=4) at eval.c:2994
#27 0x00005555557e79c7 in eval_sub (form=XIL(0x7fffe5fedecb)) at eval.c:2373
#28 0x00005555557e6cbf in Feval (form=XIL(0x7fffe5fedecb), lexical=XIL(0)) at eval.c:2147
#29 0x000055555571a89b in top_level_2 () at keyboard.c:1099
#30 0x00005555557e4d03 in internal_condition_case (bfun=0x55555571a878 <top_level_2>, handlers=XIL(0x5490), hfun=0x55555571a24e <cmd_error>) at eval.c:1376
#31 0x000055555571a8e3 in top_level_1 (ignore=XIL(0)) at keyboard.c:1107
#32 0x00005555557e4180 in internal_catch (tag=XIL(0xca50), func=0x55555571a89d <top_level_1>, arg=XIL(0)) at eval.c:1139
#33 0x000055555571a7c4 in command_loop () at keyboard.c:1068
#34 0x0000555555719d35 in recursive_edit_1 () at keyboard.c:714
#35 0x0000555555719f2d in Frecursive_edit () at keyboard.c:785
#36 0x0000555555717b08 in main (argc=1, argv=0x7fffffffe6b8) at emacs.c:1951

Lisp Backtrace:
"message" (0xffffc270)
"display-startup-echo-area-message" (0xffffc758)
"command-line-1" (0xffffd0d0)
"command-line" (0xffffdbd8)
"normal-top-level" (0xffffe1b0)
(gdb) xbacktrace 
"message" (0xffffc270)
"display-startup-echo-area-message" (0xffffc758)
"command-line-1" (0xffffd0d0)
"command-line" (0xffffdbd8)
"normal-top-level" (0xffffe1b0)
(gdb) quit
A debugging session is active.

	Inferior 1 [process 8466] will be killed.

Quit anyway? (y or n) y