Subject: bug#31072: closed (Re: 27.0.50; Assertion failure in defvar)

From: [email-masked] (GNU bug Tracking System)
Date: Mon, 16 Apr 2018 06:51:02 +0000

Your bug report

#31072: 27.0.50; Assertion failure in defvar

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
31072: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31072
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: 27.0.50; Assertion failure in defvar
From: Paul Eggert <[email-masked]>
To: Philipp Stephani <[email-masked]>
Cc: [email-masked]
Date: Sun, 15 Apr 2018 23:50:27 -0700
List-Id: <debbugs-submit.debbugs.gnu.org>

I installed that patch into master. Thanks again. Closing the bug.

Subject: 27.0.50; Assertion failure in defvar
From: Philipp <[email-masked]>
To: [email-masked]
Date: Fri, 06 Apr 2018 03:24:30 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

Loading the following file triggers an assertion failure:

;;; -*- lexical-binding: t; -*-
(defvar 1)

$ emacs -Q -batch -l /tmp/crash.el 
eval.c:772: Emacs fatal error: assertion failed: SYMBOLP (sym)
Fatal error 6: Abort trapAbort trap: 6

This is because Fdefvar lacks a CHECK_SYMBOL in the second branch
(lexical binding but only one argument).

Backtrace:

(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff6b22ce3e libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff6b36b150 libsystem_pthread.dylib`pthread_kill + 333
    frame #2: 0x00007fff6b13b8fe libsystem_c.dylib`raise + 26
    frame #3: 0x00000001001b73ca emacs`terminate_due_to_signal(sig=6, backtrace_limit=40) at emacs.c:395
    frame #4: 0x00000001001f98e3 emacs`emacs_abort at sysdep.c:2426
    frame #5: 0x0000000100453ef8 emacs`ns_term_shutdown(sig=6) at nsterm.m:5478
    frame #6: 0x00000001001b7710 emacs`shut_down_emacs(sig=6, stuff=(i = 0x0000000000000000)) at emacs.c:2132
    frame #7: 0x00000001001b7366 emacs`terminate_due_to_signal(sig=6, backtrace_limit=2147483647) at emacs.c:378
    frame #8: 0x0000000100288bab emacs`die(msg="SYMBOLP (sym)", file="eval.c", line=772) at alloc.c:7434
    frame #9: 0x00000001002f1f1d emacs`Fdefvar(args=(i = 0x0000000106051a63)) at eval.c:772
    frame #10: 0x00000001002ea9aa emacs`eval_sub(form=(i = 0x0000000106051a93)) at eval.c:2238
    frame #11: 0x000000010037d75f emacs`readevalloop_eager_expand_eval(val=(i = 0x0000000106051a93), macroexpand=(i = 0x00000000056c5668)) at lread.c:1884
    frame #12: 0x0000000100375115 emacs`readevalloop(readcharfun=(i = 0x0000000101004ba5), infile0=0x0000000000000000, sourcename=(i = 0x00000001010066b4), printflag=false, unibyte=(i = 0x0000000000000000), readfun=(i = 0x0000000000000000), start=(i = 0x0000000000000000), end=(i = 0x0000000000000000)) at lread.c:2070
    frame #13: 0x000000010037588a emacs`Feval_buffer(buffer=(i = 0x0000000101004ba5), printflag=(i = 0x0000000000000000), filename=(i = 0x00000001010048d4), unibyte=(i = 0x0000000000000000), do_allow_print=(i = 0x000000000000b8e0)) at lread.c:2137
    frame #14: 0x000000010030a6f3 emacs`funcall_subr(subr=0x000000010093c920, numargs=5, args=0x00007ffeefbf7fb0) at eval.c:2908
    frame #15: 0x0000000100308cab emacs`Ffuncall(nargs=6, args=0x00007ffeefbf7fa8) at eval.c:2821
    frame #16: 0x00000001003b2e4d emacs`exec_byte_code(bytestr=(i = 0x000000010055da5c), vector=(i = 0x000000010055da7d), maxdepth=(i = 0x000000000000001a), args_template=(i = 0x0000000000000000), nargs=0, args=0x0000000000000000) at bytecode.c:632
    frame #17: 0x000000010030b2df emacs`funcall_lambda(fun=(i = 0x000000010055d9dd), nargs=4, arg_vector=0x00007ffeefbf9478) at eval.c:3100
    frame #18: 0x0000000100308cfb emacs`Ffuncall(nargs=5, args=0x00007ffeefbf9470) at eval.c:2823
    frame #19: 0x0000000100309e89 emacs`call4(fn=(i = 0x0000000005eb6528), arg1=(i = 0x00000001010048d4), arg2=(i = 0x00000001010048d4), arg3=(i = 0x0000000000000000), arg4=(i = 0x000000000000b8e0)) at eval.c:2697
    frame #20: 0x00000001003717df emacs`Fload(file=(i = 0x0000000101229954), noerror=(i = 0x0000000000000000), nomessage=(i = 0x000000000000b8e0), nosuffix=(i = 0x0000000000000000), must_suffix=(i = 0x0000000000000000)) at lread.c:1366
    frame #21: 0x000000010030a6f3 emacs`funcall_subr(subr=0x000000010093c8f0, numargs=3, args=0x00007ffeefbf9d68) at eval.c:2908
    frame #22: 0x0000000100308cab emacs`Ffuncall(nargs=4, args=0x00007ffeefbf9d60) at eval.c:2821
    frame #23: 0x00000001003b2e4d emacs`exec_byte_code(bytestr=(i = 0x000000010063cf1c), vector=(i = 0x000000010063cf3d), maxdepth=(i = 0x000000000000005e), args_template=(i = 0x0000000000000406), nargs=1, args=0x00007ffeefbfb5f8) at bytecode.c:632
    frame #24: 0x000000010030ac7c emacs`funcall_lambda(fun=(i = 0x000000010063ceed), nargs=1, arg_vector=0x00007ffeefbfb5f0) at eval.c:3022
    frame #25: 0x0000000100308cfb emacs`Ffuncall(nargs=2, args=0x00007ffeefbfb5e8) at eval.c:2823
    frame #26: 0x00000001003b2e4d emacs`exec_byte_code(bytestr=(i = 0x0000000100637834), vector=(i = 0x0000000100637855), maxdepth=(i = 0x0000000000000032), args_template=(i = 0x0000000000000002), nargs=0, args=0x00007ffeefbfd048) at bytecode.c:632
    frame #27: 0x000000010030ac7c emacs`funcall_lambda(fun=(i = 0x0000000100637805), nargs=0, arg_vector=0x00007ffeefbfd048) at eval.c:3022
    frame #28: 0x0000000100308cfb emacs`Ffuncall(nargs=1, args=0x00007ffeefbfd040) at eval.c:2823
    frame #29: 0x00000001003b2e4d emacs`exec_byte_code(bytestr=(i = 0x00000001006367e4), vector=(i = 0x0000000100636805), maxdepth=(i = 0x0000000000000032), args_template=(i = 0x0000000000000002), nargs=0, args=0x00007ffeefbfe4e0) at bytecode.c:632
    frame #30: 0x000000010030ac7c emacs`funcall_lambda(fun=(i = 0x00000001006367b5), nargs=0, arg_vector=0x00007ffeefbfe4e0) at eval.c:3022
    frame #31: 0x00000001002fee63 emacs`apply_lambda(fun=(i = 0x00000001006367b5), args=(i = 0x0000000000000000), count=4) at eval.c:2958
    frame #32: 0x00000001002efb2c emacs`eval_sub(form=(i = 0x00000001020738d3)) at eval.c:2331
    frame #33: 0x00000001002faae7 emacs`Feval(form=(i = 0x00000001020738d3), lexical=(i = 0x0000000000000000)) at eval.c:2106
    frame #34: 0x00000001001d9b8a emacs`top_level_2 at keyboard.c:1120
    frame #35: 0x00000001002f8f4f emacs`internal_condition_case(bfun=(emacs`top_level_2 at keyboard.c:1119), handlers=(i = 0x0000000000004a10), hfun=(emacs`cmd_error at keyboard.c:939)) at eval.c:1332
    frame #36: 0x00000001001d9831 emacs`top_level_1(ignore=(i = 0x0000000000000000)) at keyboard.c:1128
    frame #37: 0x00000001002f8158 emacs`internal_catch(tag=(i = 0x000000000000bf10), func=(emacs`top_level_1 at keyboard.c:1125), arg=(i = 0x0000000000000000)) at eval.c:1097
    frame #38: 0x00000001001bba91 emacs`command_loop at keyboard.c:1089
    frame #39: 0x00000001001bb8d4 emacs`recursive_edit_1 at keyboard.c:696
    frame #40: 0x00000001001bbd01 emacs`Frecursive_edit at keyboard.c:767
    frame #41: 0x00000001001b9379 emacs`main(argc=5, argv=0x00007ffeefbff7a0) at emacs.c:1724
    frame #42: 0x00007fff6b0dd115 libdyld.dylib`start + 1

Found by american fuzzy lop.

In GNU Emacs 27.0.50 (build 60, x86_64-apple-darwin17.4.0, NS appkit-1561.20 Version 10.13.3 (Build 17D102))
 of 2018-04-06 built on p
Repository revision: 3deaac1bd9569fd57185e9e6256cc8419323ba78
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.3

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --with-modules --without-pop --with-mailutils
 --enable-gcc-warnings=yes --enable-checking
 --enable-check-lisp-object-type 'CFLAGS=-ggdb3 -O0''

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES THREADS
JSON

Important settings:
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
easymenu mml-sec password-cache epa derived epg epg-config gnus-util
rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date elec-pair
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel term/ns-win ns-win ucs-normalize mule-util term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote kqueue cocoa ns
multi-tty make-network-process emacs)

Memory information:
((conses 16 204514 6370)
 (symbols 48 19989 1)
 (miscs 40 56 173)
 (strings 32 28825 1989)
 (string-bytes 1 771796)
 (vectors 16 35273)
 (vector-slots 8 721624 13558)
 (floats 8 51 65)
 (intervals 56 210 0)
 (buffers 992 11))