From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#53136: 28.0.90; segfault in lock_file Date: Wed, 12 Jan 2022 11:04:53 +0800 Message-ID: <87y23lwt62.fsf@yahoo.com> References: <871r1hv40o.fsf.ref@yahoo.com> <871r1hv40o.fsf@yahoo.com> <83bl0l2we3.fsf@gnu.org> <87r19htjlp.fsf@yahoo.com> <838rvp2tcw.fsf@gnu.org> <875yqtt9qk.fsf@yahoo.com> <8335lxazg6.fsf@gnu.org> <37cd3017-38cb-fa2c-7b52-fbeb3b085744@cs.ucla.edu> <8735lvp01e.fsf@yahoo.com> <87czkznktd.fsf@yahoo.com> Reply-To: Po Lu Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17709"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux) Cc: Eli Zaretskii , 53136@debbugs.gnu.org To: Paul Eggert Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jan 12 04:06:25 2022 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 1n7Txx-0004Pa-Aj for geb-bug-gnu-emacs@m.gmane-mx.org; 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Wed, 12 Jan 2022 03:05:05 +0000 Original-Received: by kubenode501.mail-prod1.omega.sg3.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID ece7a3e8ff8dcb657a32151dd623c22a; Wed, 12 Jan 2022 03:04:58 +0000 (UTC) In-Reply-To: (Paul Eggert's message of "Tue, 11 Jan 2022 18:59:35 -0800") X-Mailer: WebService/1.1.19551 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo 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:223977 Archived-At: Paul Eggert writes: > On 1/10/22 17:05, Po Lu wrote: >> Po Lu writes: >> >>> That was an unrelated problem. This bug is on GNU/Linux, when running >>> under Valgrind. (I was trying to find the GC bug from last month.) >> It happens with valgrind-3.18.1-7.fc35, but not >> valgrind-3.17.0-13.fc35. >> Paul, any idea why this may be? Thanks. > > Looking at the 3.18.1 release notes: > > https://valgrind.org/docs/manual/dist.news.html > > what jumps out at me are these entries: > > * glibc 2.34, which moved various functions from libpthread.so into > libc.so, is now supported. > 407589 [Linux] Add support for C11 aligned_alloc() and GNU reallocarray() > 442061 very slow execution under Fedora 34 (readdwarf3) > > It could be that these changes caused a bug in Valgrind. I think Emacs > is using aligned_alloc and reallocarray. > > I tried building Emacs master (savannah) on both Ubuntu 21.10 x86-64, > which has valgrind-3.17.0, and on Fedora 35 x86-64, which has > valgrind-3.18.1, and both instances worked for me. I was running the > Fedora 35 instance on an AMD Phenom II X4 910e. > I merely stole a lock using an interactive Emacs as my test, > though. What test are you using to reproduce the bug? (lock-file "~/any/nonexistent/file/with/a/very/long/path") will consistently reproduce the bug.