From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Daniel Colascione Newsgroups: gmane.emacs.bugs Subject: bug#24905: 25.1.50; Lock-up in python-mode Date: Tue, 08 Nov 2016 14:45:07 -0800 Message-ID: References: NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1478645205 15743 195.159.176.226 (8 Nov 2016 22:46:45 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 8 Nov 2016 22:46:45 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) Cc: 24905@debbugs.gnu.org To: Philipp Stephani Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Nov 08 23:46:41 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c4F9d-0007pf-48 for geb-bug-gnu-emacs@m.gmane.org; Tue, 08 Nov 2016 23:46:09 +0100 Original-Received: from localhost ([::1]:35878 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c4F9g-0005vf-7y for geb-bug-gnu-emacs@m.gmane.org; Tue, 08 Nov 2016 17:46:12 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:44869) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c4F9Z-0005vM-NC for bug-gnu-emacs@gnu.org; Tue, 08 Nov 2016 17:46:06 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c4F9W-0000SC-Im for bug-gnu-emacs@gnu.org; Tue, 08 Nov 2016 17:46:05 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:34722) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1c4F9W-0000RG-CR for bug-gnu-emacs@gnu.org; Tue, 08 Nov 2016 17:46:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1c4F9W-0006T8-1P for bug-gnu-emacs@gnu.org; Tue, 08 Nov 2016 17:46:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Daniel Colascione Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 08 Nov 2016 22:46:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 24905 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 24905-submit@debbugs.gnu.org id=B24905.147864511624805 (code B ref 24905); Tue, 08 Nov 2016 22:46:01 +0000 Original-Received: (at 24905) by debbugs.gnu.org; 8 Nov 2016 22:45:16 +0000 Original-Received: from localhost ([127.0.0.1]:50120 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c4F8m-0006S1-JO for submit@debbugs.gnu.org; Tue, 08 Nov 2016 17:45:16 -0500 Original-Received: from dancol.org ([96.126.100.184]:36112) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c4F8k-0006Rt-UZ for 24905@debbugs.gnu.org; Tue, 08 Nov 2016 17:45:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=dancol.org; s=x; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date:References:Subject:Cc:To:From; bh=sTBoaXd6O3WzgVYU+NX4iuyj9ZfEEiBfo3H4ESMnmPs=; b=rOjwuODqlig53WcSR3/WBlBldNrujO+0cqH6XZKOu/+ec3XQsJo8XUS0msn2oEMAaPMeR84e6+6s+8iMq9zJ0j72Cf71AaT5xynKqHts91b0ubqk+BE5ccMal6ug0vWk8R0297ewxGOECI+zB5bDAtdPdygGGSzteLfCD000Madn8vgoKa5aWgFT3UPn3xsMzq0UmEEiyFNozIw4aGxVy4uF2Tgkne7ICgzQ8OCzwrhspy/PjAhUxlxdCi3hHrcA+o1G2F7ohDoXN6aZAXhgxh9RQg92oGOYWQ/aIXLBnqDKQW/1WFohap51Is7+4AJT03LYDJo4PR23AHb4bmejoQ==; Original-Received: from [2620:0:1008:100b:50b8:10ae:93d5:4f46] (helo=dancol-glaptop0) by dancol.org with esmtpsa (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.84_2) (envelope-from ) id 1c4F8j-000217-SB; Tue, 08 Nov 2016 14:45:13 -0800 In-Reply-To: (Daniel Colascione's message of "Tue, 08 Nov 2016 14:38:44 -0800") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:125499 Archived-At: On Tue, Nov 08 2016, Daniel Colascione wrote: > On Tue, Nov 08 2016, Philipp Stephani wrote: >> echo ' "' > /tmp/a.py >> emacs -Q /tmp/a.py >> >> Emacs locks up immediately. >> Given that this is so easy to trigger, it should block the 25.2 >> release. > > Can repro. Thanks for coming up with a small testcase. FWIW, the Lisp traceback is this: "syntax-ppss" (0xffff2978) "python-info-line-ends-backslash-p" (0xffff2e80) "python-nav-beginning-of-statement" (0xffff3388) "python-info-beginning-of-statement-p" (0xffff3840) "python-info-beginning-of-block-p" (0xffff3d38) "python-nav--forward-sexp" (0xffff43d8) "python-nav-forward-sexp" (0xffff4918) "python-nav-backward-sexp" (0xffff4e20) "python-info-docstring-p" (0xffff5378) "python-font-lock-syntactic-face-function" (0xffff5850) "font-lock-fontify-syntactically-region" (0xffff5e00) "font-lock-default-fontify-region" (0xffff6380) "font-lock-fontify-region" (0xffff6858) 0x1c27368 PVEC_COMPILED "run-hook-wrapped" (0xffff6f30) "jit-lock--run-functions" (0xffff74b0) "jit-lock-fontify-now" (0xffff7b08) "jit-lock-function" (0xffff80b8) "redisplay_internal (C function)" (0x0) We're actually finishing GC, by the way: this isn't a problem with the alloc.c guts, fortunately. We're just generating tons of garbage. I've seen infloops in python.el's syntactic analysis before. This one looks worse than usual because it happens in redisplay. (Maybe redisplay should impose time limits on lisp that it runs?)