From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Daniel Colascione Newsgroups: gmane.emacs.bugs Subject: bug#40661: Crash in regex search during redisplay Date: Thu, 16 Apr 2020 10:24:36 -0700 Message-ID: References: <83ftd3e92z.fsf@gnu.org> <83d087e6gj.fsf@gnu.org> <421071D0-6D75-4442-AC4B-D091B573B49C@dancol.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="39191"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 Cc: 40661@debbugs.gnu.org To: Richard Copley Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Apr 16 19:25:36 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 1jP8Ge-000A4Z-5C for geb-bug-gnu-emacs@m.gmane-mx.org; 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d=dancol.org; s=x; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=R2IUBHGn3Xo5pFPRFChCALpVPMl8yqY56/7ip70JFSU=; b=qmO/KfcHaKM6JoW/DbELGtWm5U ql1Z23Ty/RLYJirEfs4dN5pPo2lSb/bS/O4xFPIVUZJJOXf+vnROpMA/bmZfnNXROQ5xb775QSUcV RhEBEixr+CM3MJZ56dhcoWYLOlJtszwBpo2KCIJhextBVQ7aUWdcWqs3lq/+0aFNXCSyFIkIkNVoD 0mcBmTh95qWaUPV8889jotd1ZY7lzK7Y2EDhiW5s2zXyWYTUpcIysqHKR3NCe9bjM2ALvmq2VQHSt RwMrU2UY1B+9U/M+oFfev1fiZdH7NDQwkt5wymJoD8BAfEHVLJHq1GyzpAh6sHRqepO8cVMoE8SEB kngqA+pA==; Original-Received: from [2604:4080:1321:9a00:7d81:7dd5:971d:ee46] by dancol.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1jP8Fg-0002Z2-Vg; Thu, 16 Apr 2020 10:24:37 -0700 In-Reply-To: Content-Language: en-US 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: 209.51.188.43 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:178465 Archived-At: On 4/16/20 9:56 AM, Richard Copley wrote: > On Thu, 16 Apr 2020 at 17:42, Daniel Colascione wrote: >> >> On April 16, 2020 9:33:16 AM PDT, Eli Zaretskii wrote: >>>> Date: Thu, 16 Apr 2020 18:36:36 +0300 >>>> From: Eli Zaretskii >>>> Cc: 40661@debbugs.gnu.org >>>> >>>> Looks like GC sometimes kicks in while we are inside re_search_2 >>> >>> Or not. I cannot get a breakpoint inside GC to fire while we are in >>> search_buffer_re, so maybe my hypothesis was wrong. Although the >>> symptoms are all there: when the segfault hits, the pointers passed to >>> re_search_2 are invalid, but BEGV_ADDR and GAP_END_ADDR, from which >>> they are supposed to be computed, are valid (and different). And the >>> patch does seem to avoid the segfaults. But maybe it's just a >>> coincidence or a side effect... >> >> Try using rr and see where those pointers came from > > It seems clear from "str1=str1@entry=0xc607fd", etc., that they come > from the caller, search_buffer_re. The question is, why are they no > longer valid after updating syntax? Right. So let's see what updated the valid pointers and invalidated the invalid ones.