Subject: 29.0.50; Assert fails when browsing an URL
From: Tino Calancha <[email-masked]>
To: [email-masked]
Date: Wed, 2 Nov 2022 05:48:30 +0100 (CET)
List-Id: <debbugs-submit.debbugs.gnu.org>

emacs -Q
M-x browse-url RET
https://www.example.com RET

[The URL is opened by my default browser and Emacs crashes with the
following backtrace]

process.c:7386: Emacs fatal error: assertion failed: 0 <= fd
Fatal error 6: Aborted
Backtrace:
emacs[0x610be3]
emacs[0x5d806c]
emacs[0x68a1a0]
emacs[0x73b497]
emacs[0x73b900]
emacs[0x6103ae]
emacs[0x73b92b]
/lib64/libpthread.so.0(+0x12ce0)[0x7f937e22ace0]
emacs[0x669b85]
emacs[0x669bf0]
emacs[0x675dd7]
emacs[0x673dfc]
emacs[0x6736f3]
emacs[0x661f1f]
emacs[0x63996b]
emacs[0x63ac19]
emacs[0x6c5492]
emacs[0x7236f7]
emacs[0x6c578c]
emacs[0x6c5be4]
emacs[0x6c4f15]
emacs[0x6c520c]
emacs[0x6c406f]
emacs[0x6c5629]
emacs[0x7236f7]
emacs[0x6c578c]
emacs[0x6c5be4]
emacs[0x6c4f15]
emacs[0x6c520c]
emacs[0x5dd79a]
emacs[0x5ea9e8]
emacs[0x5eab38]
emacs[0x5e7b76]
emacs[0x5f1d97]
emacs[0x5fb14e]
emacs[0x5e486a]
emacs[0x5f9229]
emacs[0x5e090f]
emacs[0x6c0a85]
emacs[0x5e0110]
emacs[0x6bfd21]
emacs[0x5e00a8]
emacs[0x5df4a5]
emacs[0x5df6ad]
emacs[0x5db103]
/lib64/libc.so.6(__libc_start_main+0xf3)[0x7f937d057cf3]
emacs[0x4180ce]

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
  version 1.15.12, Xaw scroll bars) of 2022-11-02 built on
  tcalanch.remote.csb
Repository revision: 8a5678906fa1b899c4d111e5ee4334b278f50d48
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Red Hat Enterprise Linux 8.6 (Ootpa)

Configured using:
  'configure --enable-checking=yes,glyphs --enable-check-lisp-object-type
  --with-x-toolkit=lucid 'CFLAGS=-O0 -g3' --with-gif=ifavailable'

Configured features:
ACL CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2 XPM LUCID ZLIB

Important settings:
   value of $LANG: en_US.UTF-8
   value of $XMODIFIERS: @im=ibus
   locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
   tooltip-mode: t
   global-eldoc-mode: t
   eldoc-mode: t
   show-paren-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
   blink-cursor-mode: t
   line-number-mode: t
   indent-tabs-mode: t
   transient-mark-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date subr-x 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 rmc iso-transl tooltip cconv eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine 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 emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
xinput2 x multi-tty make-network-process emacs)

Memory information:
((conses 16 36693 5402)
  (symbols 48 5093 0)
  (strings 32 13962 1228)
  (string-bytes 1 383102)
  (vectors 16 9295)
  (vector-slots 8 147845 11034)
  (floats 8 34 25)
  (intervals 56 239 0)
  (buffers 984 10))