From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Hendrik Tews Newsgroups: gmane.emacs.bugs Subject: bug#42013: 26.3; hash tables are not garbage collected Date: Tue, 23 Jun 2020 00:20:32 +0200 Message-ID: <87zh8uwxn3.fsf@cert.kernkonzept.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="111252"; mail-complaints-to="usenet@ciao.gmane.io" To: 42013@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jun 23 01:47:18 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jnW9m-000SoO-0m for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 23 Jun 2020 01:47:18 +0200 Original-Received: from localhost ([::1]:49954 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jnW9l-0003hN-0f for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 22 Jun 2020 19:47:17 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59440) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jnW9W-0003gN-Sc for bug-gnu-emacs@gnu.org; Mon, 22 Jun 2020 19:47:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:51612) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jnW9W-000210-IR for bug-gnu-emacs@gnu.org; Mon, 22 Jun 2020 19:47:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jnW9W-0006Jl-Fp for bug-gnu-emacs@gnu.org; Mon, 22 Jun 2020 19:47:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Hendrik Tews Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 22 Jun 2020 23:47:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 42013 X-GNU-PR-Package: emacs X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Original-Received: via spool by submit@debbugs.gnu.org id=B.159286960024250 (code B ref -1); Mon, 22 Jun 2020 23:47:02 +0000 Original-Received: (at submit) by debbugs.gnu.org; 22 Jun 2020 23:46:40 +0000 Original-Received: from localhost ([127.0.0.1]:34925 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jnW97-0006J1-KI for submit@debbugs.gnu.org; Mon, 22 Jun 2020 19:46:40 -0400 Original-Received: from lists.gnu.org ([209.51.188.17]:52094) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jnUo0-0004Cm-47 for submit@debbugs.gnu.org; Mon, 22 Jun 2020 18:20:46 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57132) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jnUnz-0000Ay-Ur for bug-gnu-emacs@gnu.org; Mon, 22 Jun 2020 18:20:43 -0400 Original-Received: from serv1.kernkonzept.com ([2a01:4f8:1c1c:b490::2]:51975 helo=mx.kernkonzept.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jnUnx-0005Lw-OZ for bug-gnu-emacs@gnu.org; Mon, 22 Jun 2020 18:20:43 -0400 Original-Received: from ip5f5a9e4f.dynamic.kabel-deutschland.de ([95.90.158.79] helo=cert) by mx.kernkonzept.com with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) id 1jnUns-0002c0-Fb for bug-gnu-emacs@gnu.org; Tue, 23 Jun 2020 00:20:36 +0200 Original-Received: from localhost ([::1] helo=cert) by cert with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1jnUnr-000cEt-BL for bug-gnu-emacs@gnu.org; Tue, 23 Jun 2020 00:20:35 +0200 Received-SPF: softfail client-ip=2a01:4f8:1c1c:b490::2; envelope-from=hendrik.tews@kernkonzept.com; helo=mx.kernkonzept.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -1 X-Spam_score: -0.2 X-Spam_bar: / X-Spam_report: (-0.2 / 5.0 requ) BAYES_00=-1.9, KHOP_HELO_FCRDNS=1, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-Mailman-Approved-At: Mon, 22 Jun 2020 19:46:36 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:182295 Archived-At: Hi, I have the impression hash tables and their content are not garbage collected when the hash table is not referenced any more. Consider the following piece of elisp code: (let (gc-start gc-state hash symbol result) ;; record gc statistics (setq gc-start (garbage-collect)) ;; create a hash and put an uninterned symbol into it (setq hash (make-hash-table)) (setq symbol (make-symbol "x")) (puthash symbol t hash) ;; take gc stats and record the differences of used symbols and used ;; vectors in result (setq gc-state (garbage-collect)) (push (list 'sym1 (- (caddr (assoc 'symbols gc-state)) (caddr (assoc 'symbols gc-start)))) result) (push (list 'vec1 (- (caddr (assoc 'vectors gc-state)) (caddr (assoc 'vectors gc-start)))) result) ;; make the symbol and the hash inaccessible (setq symbol nil) (setq hash nil) ;; take gc stats again and record the differences of used symbols ;; and used vectors in result (setq gc-state (garbage-collect)) (push (list 'sym2 (- (caddr (assoc 'symbols gc-state)) (caddr (assoc 'symbols gc-start)))) result) (push (list 'vec2 (- (caddr (assoc 'vectors gc-state)) (caddr (assoc 'vectors gc-start)))) result) result) With emacs -Q it returns ((vec2 5) (sym2 1) (vec1 5) (sym1 1)), while I was expecting ((vec2 0) (sym2 0) ...). What am I doing wrong that prevents the third call to garbage-collect to garbage collect the hash and the uninterned symbol? Note that with inserting a clrhash before setting hash to nil, the symbol gets collected, but the vectors won't. What is needed to garbage collect a hash table? Thanks, Hendrik text generated by report-emacs-bug: In GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.20) of 2020-05-17, modified by Debian built on x86-csail-01 Windowing system distributor 'The X.Org Foundation', version 11.0.12008000 System Description: Debian GNU/Linux bullseye/sid Recent messages: For information about GNU Emacs and the GNU system, type C-h C-a. Configured using: 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.3/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.3/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs-mHAik2/emacs-26.3+1=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM THREADS LIBSYSTEMD LCMS2 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 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 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 cl-loaddefs cl-lib 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 sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type 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 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 threads dbusbind inotify lcms2 dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 16 96516 5845) (symbols 48 20785 1) (miscs 40 45 96) (strings 32 29163 1930) (string-bytes 1 763910) (vectors 16 14012) (vector-slots 8 507754 6556) (floats 8 49 68) (intervals 56 268 0) (buffers 992 12))