From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: kallsyms in buildid - broken mapping? Date: Tue, 27 Jun 2017 16:16:47 +0200 Message-ID: <6006405.Fli7mH7B85@milian-kdab2> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2048217.TODXZFmBnt"; micalg="sha256"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:52480 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752922AbdF0ORA (ORCPT ); Tue, 27 Jun 2017 10:17:00 -0400 Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: linux-perf-users@vger.kernel.org Cc: namhyung@kernel.org, Arnaldo Carvalho de Melo --nextPart2048217.TODXZFmBnt Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Hey all, a colleague of mine just sent me a `perf archive` tarball and the accompanying perf.data file. The tarball contains a kallsyms entry with build-id for `[kernel.kallsyms]`. But the file seems to be bogus, it only contains "null" mappings, i.e.: $ head kallsyms 0000000000000000 A irq_stack_union 0000000000000000 A __per_cpu_start 0000000000000000 A exception_stacks 0000000000000000 A gdt_page 0000000000000000 A espfix_waddr 0000000000000000 A espfix_stack 0000000000000000 A cpu_info 0000000000000000 A cpu_llc_shared_map 0000000000000000 A cpu_core_map 0000000000000000 A cpu_sibling_map $ cut -f1 -d' ' < kallsyms | uniq -c 144971 0000000000000000 He now also sent me a copy of `/proc/kallsyms` which actually seems to contain a useful mapping. Any idea what lead to the broken original mapping? Thanks -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart2048217.TODXZFmBnt 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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