From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: perf inject --sched-stat can produce invalid perf.data files Date: Tue, 30 Aug 2016 23:26:53 +0200 Message-ID: <1996346.OFykjbkAe6@agathebauer> References: <1705181.9Ekn7j0XTY@agathebauer> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2395423.6lVTeE4ouF"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:43890 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751609AbcH3V06 (ORCPT ); Tue, 30 Aug 2016 17:26:58 -0400 In-Reply-To: <1705181.9Ekn7j0XTY@agathebauer> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: linux-perf-users@vger.kernel.org Cc: Arnaldo Carvalho de Melo --nextPart2395423.6lVTeE4ouF Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Dienstag, 16. August 2016 17:56:10 CEST Milian Wolff wrote: > Hey all, ping? > I've hit another issue that I have trouble understanding and fixing: > > ~~~~~~~~~~~~ > echo 1 | sudo tee /proc/sys/kernel/sched_schedstats > > perf record \ > --event sched:sched_stat_sleep/call-graph=no/ \ > --event sched:sched_switch/call-graph=fp/ \ > --output perf.data.raw \ > sleep 1 > > echo 0 | sudo tee /proc/sys/kernel/sched_schedstats > > perf inject --sched-stat --input perf.data.raw --output perf.data > perf script # or perf report > 0x4e18 [0xd8]: failed to process type: 9 > ~~~~~~~~~~~~ > > This happens only for the perf.data produced by perf-inject when at least > one of the sched events has no call graph. > > Looking at the code, I see that the issue is triggered in evsel.c: > > ~~~~~~~~~~~~ > if (type & PERF_SAMPLE_CALLCHAIN) { > const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); > > OVERFLOW_CHECK_u64(array); > data->callchain = (struct ip_callchain *)array++; > if (data->callchain->nr > max_callchain_nr) > return -EFAULT; > sz = data->callchain->nr * sizeof(u64); > OVERFLOW_CHECK(array, sz, max_size); > array = (void *)array + sz; > } > ~~~~~~~~~~~~ > > In GDB: > > ~~~~~~~~~~~~ > (gdb) break evsel.c:1859 > Breakpoint 1 at 0x5555556704d9: file util/evsel.c, line 1859. > (gdb) run > Starting program: /home/milian/.bin/perf script > [Thread debugging using libthread_db enabled] > Using host libthread_db library "/usr/lib/libthread_db.so.1". > > Breakpoint 1, perf_evsel__parse_sample (evsel=0x5555571c1d50, > event=0x7ffff7ff4e18, data=0x7fffffffb3e0) at util/evsel.c:1861 > 1861 data->callchain = (struct ip_callchain *)array++; > (gdb) next > 1862 if (data->callchain->nr > max_callchain_nr) > (gdb) print *data->callchain > $1 = {nr = 61654255534090, ips = 0x7ffff7ff4e58} > (gdb) next > 1864 sz = data->callchain->nr * sizeof(u64); > (gdb) > 1865 OVERFLOW_CHECK(array, sz, max_size); > (gdb) print sz > $2 = 493234044272720 > (gdb) next > 1934 return -EFAULT; > ~~~~~~~~~~~~ > > Can someone please look into this issue and find a way to fix perf-inject? -- 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 --nextPart2395423.6lVTeE4ouF Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVy bmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MIIBIjAN 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