From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Richard Copley Newsgroups: gmane.emacs.bugs Subject: bug#40661: Crash in regex search during redisplay Date: Thu, 16 Apr 2020 17:56:51 +0100 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" Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="47554"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 40661@debbugs.gnu.org To: Daniel Colascione Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Apr 16 18:58:13 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 1jP7q9-000CEO-3Z for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 16 Apr 2020 18:58:13 +0200 Original-Received: from localhost ([::1]:37170 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jP7q8-0002ye-47 for geb-bug-gnu-emacs@m.gmane-mx.org; 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=r2bH+FbkNInWIrBb7eeebg01yNeiT0s7GF2qME6sYEo=; b=nvyxppIDM9OsuzNQp+b+Fiy34IpQKmALkqbxfLuu6fFRtnEhenbJXL2FVfbm3egF5Y QE1NDPq5sgCN6fMlWr3Ola6pQmV5rCYo0sH8N9Uj+69GxVOsDBr5/IMHW6jzMsLVWq5o 22QFi6TyyoKpZd8kSC7yeTlC4ZGRJq1MCuks9IbAa/tkOF1cpmisdqiHEWjm8yHGLxIP vlWItIa0YQOSJxYD7X79DKnqMpkBEb1FGpwt9TOyJ56r+2fbfLAehaPGMwuavDnK3FHF 7IsOqR7pOq34C5MS4UM75RIgZsFJII2ZHB6uOhVcnrKd+GnQRL5aRwQOZVvjE9IsNZRN omew== X-Gm-Message-State: AGi0Pua4Y8tQpumnjRWiEKmhY86eAH/XKQWF8mZwILZKeyF5NukLQQCD ckATMYdf03wv8PweKc+nnX4J7qr8xB3BlV7TvA8= X-Google-Smtp-Source: APiQypIchbcihKT6gpZ6lxL17XsK09BlcIKQI9UkxVxPQKir3NX8yhpj4ZqE9fQq/AOOiXyJKOiaLxGIH6pLF46P+8A= X-Received: by 2002:aca:3745:: with SMTP id e66mr3345633oia.153.1587056236923; Thu, 16 Apr 2020 09:57:16 -0700 (PDT) In-Reply-To: <421071D0-6D75-4442-AC4B-D091B573B49C@dancol.org> 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:178464 Archived-At: 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?