From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Dmitry Antipov Newsgroups: gmane.emacs.bugs Subject: bug#16603: 24.3.50; Segfault when viewing a backtrace Date: Fri, 31 Jan 2014 11:03:16 +0400 Message-ID: <52EB4AB4.8040004@yandex.ru> References: <878utw28pl.fsf@building.gnus.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1391151854 1264 80.91.229.3 (31 Jan 2014 07:04:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 31 Jan 2014 07:04:14 +0000 (UTC) Cc: 16603@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Jan 31 08:04:21 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W989E-0006Dv-Ng for geb-bug-gnu-emacs@m.gmane.org; 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Fri, 31 Jan 2014 11:03:17 +0400 (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (Client certificate not present) X-Yandex-Uniq: 0baea5e0-2a5a-4d35-a3f9-e65726988ac0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1391151797; bh=VJk2RYVI7gk+806K1uvoCRkNH+5Uy/cbdgX6ANuDH7I=; h=Message-ID:Date:From:User-Agent:MIME-Version:To:CC:Subject: References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=D/OX6rsbRKjiHAAg3djCJNsriu6Xh01xDnxdsHgTp8rAKDKRq8iAP9f5PZHGLmLGw c1kYTntfRlUSuKc6fJzzT2YTrGgvFfOzKrLHYYkGX0VPstmtf9/K8NP1AZCQstJ8vP dTtPkXlvmx0P8GETVgXJRPgl/wokuodfJ6IcC0yE= Authentication-Results: smtp2o.mail.yandex.net; dkim=pass header.i=@yandex.ru User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 In-Reply-To: <878utw28pl.fsf@building.gnus.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:84329 Archived-At: On 01/31/2014 06:20 AM, Lars Ingebrigtsen wrote: > (require 'gnus-group) > (setq debug-on-error t) > (gnus-read-ephemeral-emacs-bug-group 16577) > > Choose Rotem's article, and my Emacs crashes: Reproduced. With the only extra eassert: === modified file 'src/eval.c' --- src/eval.c 2014-01-25 03:48:29 +0000 +++ src/eval.c 2014-01-31 06:49:49 +0000 @@ -3191,6 +3191,7 @@ void record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg) { + eassert (specpdl_ptr < specpdl + specpdl_size); specpdl_ptr->unwind.kind = SPECPDL_UNWIND; specpdl_ptr->unwind.func = function; specpdl_ptr->unwind.arg = arg; I got the following backtrace: #14 0x00000000005eafb9 in die (msg=0x70d440 "specpdl_ptr < specpdl + specpdl_size", file=0x70c498 "../../trunk/src/eval.c", line=3194) at ../../trunk/src/alloc.c:6761 #15 0x000000000060d987 in record_unwind_protect (function=0x605b1a , arg=...) at ../../trunk/src/eval.c:3194 #16 0x0000000000605c1f in call_debugger (arg=...) at ../../trunk/src/eval.c:290 #17 0x0000000000609b3b in maybe_call_debugger (conditions=..., sig=..., data=...) at ../../trunk/src/eval.c:1724 #18 0x00000000006093a5 in Fsignal (error_symbol=..., data=...) at ../../trunk/src/eval.c:1542 #19 0x00000000006094be in xsignal (error_symbol=..., data=...) at ../../trunk/src/eval.c:1579 #20 0x00000000006096e3 in signal_error (s=0x70d008 "Variable binding depth exceeds max-specpdl-size", arg=...) at ../../trunk/src/eval.c:1634 #21 0x000000000060a6f6 in grow_specpdl () at ../../trunk/src/eval.c:2023 #22 0x000000000060a7e3 in record_in_backtrace (function=..., args=0x7ffffff78020, nargs=1) at ../../trunk/src/eval.c:2042 #23 0x000000000060c383 in Ffuncall (nargs=2, args=0x7ffffff78018) at ../../trunk/src/eval.c:2754 IIUC this is a kind of chicken-egg problem: when we're running out of specpdl stack, we want to run a debugger, which, in turn, needs some specpdl space to run. Dmitry