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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 EC097C43331 for ; Fri, 27 Mar 2020 12:20:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B57DA20787 for ; Fri, 27 Mar 2020 12:20:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kdab.com header.i=@kdab.com header.b="KJcY2aIs" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726540AbgC0MUy (ORCPT ); Fri, 27 Mar 2020 08:20:54 -0400 Received: from mail.kdab.com ([176.9.126.58]:61228 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726454AbgC0MUy (ORCPT ); Fri, 27 Mar 2020 08:20:54 -0400 X-Greylist: delayed 595 seconds by postgrey-1.27 at vger.kernel.org; Fri, 27 Mar 2020 08:20:52 EDT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kdab.com; h= content-type:content-type:mime-version:references:in-reply-to :organization:message-id:date:date:subject:subject:from:from; s= dkim; t=1585311052; x=1586175053; bh=0v5S+/wxKMPHa2dUqc3WLv2VzjI U0pvmr95mPMTqUK0=; b=KJcY2aIsL1eTfCn9V+CmqW21STvDJ4jFm2xujhFQqsY usJ41iDLC99YqKWtqLyzmlGIbB5NW+GIjtrROQMQy7+5rw+wvVemCi+ut78AIFxy n1HjmvTf+FWHwoiDC10KXMkqOXAwaHtJ4seEQsH2OIcAjWL5B64GURtavyMWPbkM = X-Virus-Scanned: amavisd-new at kdab.com From: Milian Wolff To: Jiri Olsa , ahmadkhorrami Cc: Steven Rostedt , Arnaldo Carvalho de Melo , Linux-trace Users , Peter Zijlstra , linux-trace-users-owner@vger.kernel.org, Jin Yao , Namhyung Kim , Changbin Du , Andi Kleen Subject: Re: Wrong Perf Backtraces Date: Fri, 27 Mar 2020 13:10:50 +0100 Message-ID: <2478802.X9hSmTKtgW@agathebauer> Organization: KDAB In-Reply-To: References: <20200325210252.GC1947699@krava> <821540886fc57d7749edee585a50602f@ut.ac.ir> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart12890461.RDIVbhacDa"; micalg="sha256"; protocol="application/pkcs7-signature" Sender: linux-trace-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-users@vger.kernel.org --nextPart12890461.RDIVbhacDa Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" On Freitag, 27. M=E4rz 2020 12:04:20 CET ahmadkhorrami wrote: > I do the following: > If this line is in the perf script backtrace: > 7f21ffe256db g_main_context_iteration+0x2b > (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.5600.4) > I run the following command: > gdb -batch -ex 'file /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.5600.4' > -ex 'disass g_main_context_iteration'. You can try to parse the output of `perf buildid-list` to get a mapping tha= t=20 can be used to run this on another person's machine. E.g. ``` $ perf buildid-list 5837b1e7495db791f9a3a56fb6ca29958da75b0c [kernel.kallsyms] 845f98f6a3019620c37a2f611b2f20c27de83d5b /home/milian/projects/kdab/rnd/ hotspot/build/tests/test-clients/cpp-parallel/cpp-parallel f6ca5853dae87d9f0503a9ef230f6d1fa15a832d /usr/lib/ld-2.30.so 92883b06055e8e21ded8eb0cd5a61f5704531152 [vdso] 8b04d1825b63d9a600e3d57ac71058935e7ad757 /usr/lib/libpthread-2.30.so 09639b80a8fad179004f2484608764d2b336dd4a /usr/lib/libstdc++.so.6.0.27 33d1f350f13728651d74dd2a56bad1e4e4648f5e /usr/lib/libc-2.30.so $ file ~/.debug/usr/lib/ld-2.30.so/f6ca5853dae87d9f0503a9ef230f6d1fa15a832d/ elf=20 /home/milian/.debug/usr/lib/ld-2.30.so/ f6ca5853dae87d9f0503a9ef230f6d1fa15a832d/elf: ELF 64-bit LSB shared object,= =20 x86-64, version 1 (SYSV), statically linked,=20 BuildID[sha1]=3Df6ca5853dae87d9f0503a9ef230f6d1fa15a832d, not stripped ``` I'm afraid to say that I currently don't have the time required to be of mo= re=20 help in debugging this issue in general. Good luck! =2D-=20 Milian Wolff | milian.wolff@kdab.com | Senior Software Engineer KDAB (Deutschland) GmbH, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt, C++ and OpenGL Experts --nextPart12890461.RDIVbhacDa Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDEIw ggXmMIIDzqADAgECAhBqm+E4O/8ra58B1dm4p1JWMA0GCSqGSIb3DQEBDAUAMIGFMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDErMCkGA1UEAxMiQ09NT0RPIFJTQSBDZXJ0aWZpY2F0aW9u IEF1dGhvcml0eTAeFw0xMzAxMTAwMDAwMDBaFw0yODAxMDkyMzU5NTlaMIGXMQswCQYDVQQGEwJH QjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYDVQQK ExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVudGlj YXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB 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