From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA2CAC433DF for ; Thu, 25 Jun 2020 22:11:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96AB020781 for ; Thu, 25 Jun 2020 22:11:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=nazar.ca header.i=@nazar.ca header.b="OX3kCdRe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404390AbgFYWLR (ORCPT ); Thu, 25 Jun 2020 18:11:17 -0400 Received: from ny018.relay.arandomserver.com ([172.96.188.180]:57455 "EHLO ny018.relay.arandomserver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728541AbgFYWLQ (ORCPT ); Thu, 25 Jun 2020 18:11:16 -0400 X-Greylist: delayed 1615 seconds by postgrey-1.27 at vger.kernel.org; Thu, 25 Jun 2020 18:11:16 EDT Received: from nyc006.hawkhost.com ([172.96.186.142]) by se004.arandomserver.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1joZfM-0003Wg-KD; Thu, 25 Jun 2020 16:44:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nazar.ca; s=default; 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=5ZaFD8xwGGh4ZdyibW8EjPSLF0QDDusZLmEjDbPyi78=; b=OX3kCdRenmGp43LlcV9wzVy9VJ lZhBI2x2o96VtqRmARrKpD5yqdopRr4vUh1mHUV6c6A1ZfDfW0Iavq3AcYwac5amsE8LglwbN6KOf XjQOXQgq55UxU1wCOzNOQ83AywmKqoCBRRdZ/IVdB+mDgUUIjyIbJmTHhNOJhW2uA3s3k9GBd+RGz 7rwOUpgpuq1HLRtnI/hQHUxgMsuldjsoqxRQrN1X9IFpk5dUeLRdvWT11TtO068mUHrFgcdixJUV1 BmMurk8CD7DagcujhQPkixy5/wTLQIXIjBKzRo+fRLAn16EPFJjQ2L4FcJkCyRVMl5vFRaUNtwbCp RA91NBog==; Received: from [174.119.114.224] (port=56455 helo=[192.168.21.100]) by nyc006.hawkhost.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1joZfK-0001pV-T3; Thu, 25 Jun 2020 17:44:14 -0400 Subject: Re: Strange segmentation violations of rpc.gssd in Debian Buster To: "Kraus, Sebastian" , "J. Bruce Fields" Cc: "linux-nfs@vger.kernel.org" References: <20200619220434.GB1594@fieldses.org> <28a44712b25c4420909360bd813f8bfd@tu-berlin.de> <20200620170316.GH1514@fieldses.org> <5c45562c90404838944ee71a1d926c74@tu-berlin.de> <20200622223628.GC11051@fieldses.org> <406fe972135846dc8a23b60be59b0590@tu-berlin.de> From: Doug Nazar Message-ID: <1527b158-3404-168c-8908-de4b8a709ccd@nazar.ca> Date: Thu, 25 Jun 2020 17:44:14 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.0 MIME-Version: 1.0 In-Reply-To: <406fe972135846dc8a23b60be59b0590@tu-berlin.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Get-Message-Sender-Via: nyc006.hawkhost.com: authenticated_id: nazard@nazar.ca X-Authenticated-Sender: nyc006.hawkhost.com: nazard@nazar.ca X-Originating-IP: 172.96.186.142 X-SpamExperts-Domain: nyc006.hawkhost.com X-SpamExperts-Username: 172.96.186.142 Authentication-Results: arandomserver.com; auth=pass smtp.auth=172.96.186.142@nyc006.hawkhost.com X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: Combined (0.13) X-Recommended-Action: accept X-Filter-ID: Mvzo4OR0dZXEDF/gcnlw0f6LF1GdvkEexklpcFpSF5apSDasLI4SayDByyq9LIhVn0pr/eWrXTid XTJ2Y50JtUTNWdUk1Ol2OGx3IfrIJKyP9eGNFz9TW9u+Jt8z2T3K5r8HtW+i+zOSEp4G6/nKTpHR 3t4R4vw0+gs6rQMezuDQdD3ECQyPVYuo/ujzNsc8V72ZlMoYFW/iILNesMKWB6DY4cCrsCyAwHoj HGSwEc8CUhteWi9sZ0/D91cArp6Aaq2N3Fs371WfzRtGJWrwKAK/NzaQ0kU5LIjXaSmvljwhyk8Q 3euhueWKWlOW4QobXxusReGs8D5s+BpOoqsKPHnEEeQIwKMymizPrn975/qMR6RnXDqOz0oQYKSM 2MZ1trSG+zanhVH6MyN4UABWXkpCHkq3t2QWc5y7R2vgTKTvxnrnHtOKPp7r4O3DezwNkL/+h1aL 2OqtpSX2AHJEJUCbUeEMVjDon5rfSznEF9Wn0xds8xzlI9bNNBd60UaaLFOTFOSXhInfKu2LaPOi g0Tz8DRKXZMehWGgJjrhqyz6Bfy1T3PwsUos1yNYdTOG17NirEYyqwqMBGrw8ELiqOQm0t959gAh KvRa1vmpN2P40gxJLR2O3anAdXM16WBTRUFUU5/JtLKKEUu4esXRICk4xAm9D8KTeKJT7gNACPd+ nNEjPOAcc2mSKil38RhC5WpVRRy7ey4Vrj8oN0DwH5zchTwz5HNHuVi9qs3XQ4gnJC8t6+rWfQsb 10XcAoxwQk8w+7owm6K0HfhUbV86k35e90wcVfDxixi0L/Em6K0oqBBzZqz34WAUSeMDkO8xLypP fi/26oO2cauHDD/6kTRqq9XJ3A7TbtUilHMjAbMQ9r701nWrAsLwohWm7wYLeHkNjfXxRRqyRbYy SsHpHKadYLixxWRJdjXT5NXOLDAccBIk1Sag4dKiqCrF8eZZ3gAFgf5pxcvjqhYUkJ+PVcagBWhr PqYGcDoUB+MVMogTqfDNG/eSEDCU3zUmlBVgZvOugleMfvBA1j+Q7fKKz3fccSHpoEA6x1E6NCAy 03IIEaw2FATNOSyR0hlRJ2bU83KrEXc+Z1DahbUFzBX4rvXS1+qgaVt1ORMtpYIBctpo5lIZ42Pp IMd67+j9MC/iEbKoMM0R+bccIbn7fCdCag== X-Report-Abuse-To: spam@se001.arandomserver.com Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On 2020-06-25 13:43, Kraus, Sebastian wrote: > [Current thread is 1 (Thread 0x7fb2eaeba700 (LWP 14174))] > (gdb) bt > #0 0x000056233fff038e in ?? () > #1 0x000056233fff09f8 in ?? () > #2 0x000056233fff0b92 in ?? () > #3 0x000056233fff13b3 in ?? () > #4 0x00007fb2eb8dbfa3 in start_thread (arg=) at pthread_create.c:486 > #5 0x00007fb2eb80c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 > (gdb) quit > > > I am not an expert in analyzing stack and backtraces. Is there anything meaningful, you are able to extract from the trace? > As far as I see, thread 14174 caused the segmentation violation just after its birth on clone. > Please correct me, if I am in error. > Seems Debian Buster does not ship any dedicated package with debug symbols for the rpc.gssd executable. > So far, I was not able to find such a package. > What's your opinon about the trace? You'll need to install the debug symbols for your distribution/package. A quick google links to https://wiki.debian.org/HowToGetABacktrace. Those ?? lines should then be replaced with function, file & line numbers. I've been following this with interest since it used to happen to me a lot. It hasn't recently, even though every so often I spend a few hours trying to re-create it to try debug it. Doug