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Date: Mon, 01 Jun 2015 17:18:28 -0300 From: Daniel Bristot de Oliveira <bristot@...hat.com> To: John Stultz <john.stultz@...aro.org>, lkml <linux-kernel@...r.kernel.org> CC: Prarit Bhargava <prarit@...hat.com>, Richard Cochran <richardcochran@...il.com>, Jan Kara <jack@...e.cz>, Jiri Bohac <jbohac@...e.cz>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Shuah Khan <shuahkh@....samsung.com> Subject: Re: [RFC][PATCH 0/4] Fixes for leapsecond expiring early ABS_TIME CLOCK_REALTIME timers Il 29/05/2015 17:24, John Stultz ha scritto: > Thus this patch series tries to address this isssue, including > extending the leap-a-day test to catch this problem, as well > as other relevant fixups I found while working on the code. > > This series has only had limited testing, so I wanted to send > it out for initial review and comment. Folks can grab this tree > via git for testing here: > https://git.linaro.org/people/john.stultz/linux.git dev/early-leap-timer John, I saw two failures while testing the patched kernel using the patched leap-a-day. On both cases the leap second was not inserted, and then the timer fired at the second edge (as expected?). Here is the output of both leap-a-day and dmesg for both errors: ===== Error 1 ===== [root@...tro timers]# ./leap-a-day -s [...many lines...] Setting time to Wed Sep 9 20:59:50 2015 Scheduling leap second for Wed Sep 9 21:00:00 2015 Setting timer for Wed Sep 9 21:00:00 2015 Wed Sep 9 20:59:57 2015 + 147 us (0) TIME_INS Wed Sep 9 20:59:57 2015 + 500352 us (0) TIME_INS Wed Sep 9 20:59:58 2015 + 558 us (0) TIME_INS Wed Sep 9 20:59:58 2015 + 500767 us (0) TIME_INS Wed Sep 9 20:59:59 2015 + 975 us (0) TIME_INS Wed Sep 9 20:59:59 2015 + 501181 us (0) TIME_INS Wed Sep 9 20:59:59 2015 + 1442 us (1) TIME_OOP Wed Sep 9 20:59:59 2015 + 501670 us (1) TIME_OOP Wed Sep 9 21:00:00 2015 + 110 us (1) TIME_WAIT - TIMER FIRED Wed Sep 9 21:00:00 2015 + 179 us (1) TIME_WAIT Wed Sep 9 21:00:00 2015 + 500340 us (1) TIME_WAIT Wed Sep 9 21:00:01 2015 + 548 us (1) TIME_WAIT Wed Sep 9 21:00:01 2015 + 500768 us (1) TIME_WAIT Wed Sep 9 21:00:02 2015 + 976 us (1) TIME_WAIT Leap complete Setting time to Thu Sep 10 20:59:50 2015 Scheduling leap second for Thu Sep 10 21:00:00 2015 Setting timer for Thu Sep 10 21:00:00 2015 Thu Sep 10 20:59:57 2015 + 209 us (1) TIME_DEL Thu Sep 10 20:59:57 2015 + 500410 us (1) TIME_DEL Thu Sep 10 20:59:58 2015 + 646 us (1) TIME_DEL Thu Sep 10 20:59:58 2015 + 500881 us (1) TIME_DEL Thu Sep 10 21:00:00 2015 + 1182 us (0) TIME_WAIT - TIMER FIRED Thu Sep 10 21:00:00 2015 + 1283 us (0) TIME_WAIT Thu Sep 10 21:00:00 2015 + 501475 us (0) TIME_WAIT Thu Sep 10 21:00:01 2015 + 1654 us (0) TIME_WAIT Thu Sep 10 21:00:01 2015 + 501856 us (0) TIME_WAIT Thu Sep 10 21:00:02 2015 + 2032 us (0) TIME_WAIT Leap complete Setting time to Fri Sep 11 20:59:50 2015 Scheduling leap second for Fri Sep 11 21:00:00 2015 Setting timer for Fri Sep 11 21:00:00 2015 Fri Sep 11 20:59:57 2015 + 139 us (0) TIME_INS Fri Sep 11 20:59:57 2015 + 500347 us (0) TIME_INS Fri Sep 11 20:59:58 2015 + 527 us (0) TIME_INS Fri Sep 11 20:59:58 2015 + 500751 us (0) TIME_INS Fri Sep 11 20:59:59 2015 + 987 us (0) TIME_INS Fri Sep 11 20:59:59 2015 + 501203 us (0) TIME_INS Fri Sep 11 21:00:00 2015 + 100 us (0) TIME_INS - TIMER FIRED Error: Incorrect NTP state? Fri Sep 11 21:00:00 2015 + 173 us (0) TIME_INS Fri Sep 11 21:00:00 2015 + 500353 us (0) TIME_OK Fri Sep 11 21:00:01 2015 + 583 us (0) TIME_OK Fri Sep 11 21:00:01 2015 + 500799 us (0) TIME_OK Fri Sep 11 21:00:02 2015 + 1021 us (0) TIME_OK Leap complete Errors observed [root@...tro timers]# dmesg | tail [ 1451.279313] Clock: deleting leap second 23:59:59 UTC [ 1464.296724] Clock: inserting leap second 23:59:60 UTC [ 1477.312373] Clock: deleting leap second 23:59:59 UTC [ 1490.329740] Clock: inserting leap second 23:59:60 UTC [ 1503.345402] Clock: deleting leap second 23:59:59 UTC [ 1516.362841] Clock: inserting leap second 23:59:60 UTC [ 1529.378466] Clock: deleting leap second 23:59:59 UTC [ 1542.395826] Clock: inserting leap second 23:59:60 UTC [ 1555.411551] Clock: deleting leap second 23:59:59 UTC [ 1697.998312] Adjusting tsc more than 11% (5677670 vs 7466007) <-- ??? ---> did not insert the leap second <--- ## did not insert the leap second ===== Error 2 ===== [root@...tro timers]# ./leap-a-day -s [...many lines...] Setting time to Wed Aug 19 20:59:50 2015 Scheduling leap second for Wed Aug 19 21:00:00 2015 Setting timer for Wed Aug 19 21:00:00 2015 Something cleared STA_INS/STA_DEL, setting it again. Wed Aug 19 20:59:57 2015 + 181 us (0) TIME_OK Wed Aug 19 20:59:57 2015 + 500357 us (0) TIME_INS Wed Aug 19 20:59:58 2015 + 559 us (0) TIME_INS Wed Aug 19 20:59:58 2015 + 500761 us (0) TIME_INS Wed Aug 19 20:59:59 2015 + 967 us (0) TIME_INS Wed Aug 19 20:59:59 2015 + 501177 us (0) TIME_INS Wed Aug 19 20:59:59 2015 + 1318 us (1) TIME_OOP Wed Aug 19 20:59:59 2015 + 501508 us (1) TIME_OOP Wed Aug 19 21:00:00 2015 + 99 us (1) TIME_WAIT - TIMER FIRED Wed Aug 19 21:00:00 2015 + 161 us (1) TIME_WAIT Wed Aug 19 21:00:00 2015 + 500320 us (1) TIME_WAIT Wed Aug 19 21:00:01 2015 + 523 us (1) TIME_WAIT Wed Aug 19 21:00:01 2015 + 500735 us (1) TIME_WAIT Wed Aug 19 21:00:02 2015 + 937 us (1) TIME_WAIT Leap complete Setting time to Thu Aug 20 20:59:50 2015 Scheduling leap second for Thu Aug 20 21:00:00 2015 Setting timer for Thu Aug 20 21:00:00 2015 Thu Aug 20 20:59:57 2015 + 144 us (1) TIME_DEL Thu Aug 20 20:59:57 2015 + 500351 us (1) TIME_DEL Thu Aug 20 20:59:58 2015 + 552 us (1) TIME_DEL Thu Aug 20 20:59:58 2015 + 500752 us (1) TIME_DEL Thu Aug 20 21:00:00 2015 + 1021 us (0) TIME_WAIT - TIMER FIRED Thu Aug 20 21:00:00 2015 + 1096 us (0) TIME_WAIT Thu Aug 20 21:00:00 2015 + 501267 us (0) TIME_WAIT Thu Aug 20 21:00:01 2015 + 1470 us (0) TIME_WAIT Thu Aug 20 21:00:01 2015 + 501677 us (0) TIME_WAIT Thu Aug 20 21:00:02 2015 + 1886 us (0) TIME_WAIT Leap complete Setting time to Fri Aug 21 20:59:50 2015 Scheduling leap second for Fri Aug 21 21:00:00 2015 Setting timer for Fri Aug 21 21:00:00 2015 Fri Aug 21 20:59:57 2015 + 153 us (0) TIME_INS Fri Aug 21 20:59:57 2015 + 500354 us (0) TIME_INS Fri Aug 21 20:59:58 2015 + 562 us (0) TIME_INS Fri Aug 21 20:59:58 2015 + 500815 us (0) TIME_INS Fri Aug 21 20:59:59 2015 + 1000 us (0) TIME_INS Fri Aug 21 20:59:59 2015 + 501207 us (0) TIME_INS Fri Aug 21 21:00:00 2015 + 109 us (0) TIME_INS - TIMER FIRED Error: Incorrect NTP state? Fri Aug 21 21:00:00 2015 + 173 us (0) TIME_INS Fri Aug 21 21:00:00 2015 + 500331 us (0) TIME_OK Fri Aug 21 21:00:01 2015 + 540 us (0) TIME_OK Fri Aug 21 21:00:01 2015 + 500791 us (0) TIME_OK Fri Aug 21 21:00:02 2015 + 1046 us (0) TIME_OK Leap complete Errors observed [root@...tro timers]# dmesg | tail [ 1283.857902] Clock: inserting leap second 23:59:60 UTC [ 1296.873600] Clock: deleting leap second 23:59:59 UTC [ 1309.891049] Clock: inserting leap second 23:59:60 UTC [ 1322.906709] Clock: deleting leap second 23:59:59 UTC [ 1335.924154] Clock: inserting leap second 23:59:60 UTC [ 1348.939824] Clock: deleting leap second 23:59:59 UTC [ 1361.957267] Clock: inserting leap second 23:59:60 UTC [ 1374.972919] Clock: deleting leap second 23:59:59 UTC [ 1387.989238] Clock: inserting leap second 23:59:60 UTC [ 1401.005877] Clock: deleting leap second 23:59:59 UTC ---> did not insert the leap second <--- Both cases occurred in the same physical machine. AFAICS, it does not occur in the unpatched kernel/leap-a-day in the same machine. -- Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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