hello,
failure of a test in selftest:timers
selftests: raw_skew ======================================== WARNING: ADJ_OFFSET in progress, this will cause inaccurate results Estimating clock drift: 17.910(est) 16.820(act) [FAILED] Bail out! Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 1..0 not ok 1..7 selftests: raw_skew [FAIL]
To reproduce :
make -C tools/testing/selftests/timers/ run_tests
Linux debian 4.17.0-rc1+ #3 SMP Sat Apr 21 03:41:44 IST 2018 x86_64 GNU/Linux
GNU Make 4.2.1 Binutils 2.30 Util-linux 2.31.1 Mount 2.31.1 Linux C Library 2.27 Dynamic linker (ldd) 2.27 readlink: missing operand Try 'readlink --help' for more information. Procps 3.3.14 Kbd 2.0.4 Console-tools 2.0.4 Sh-utils 8.28 Udev 238
On Sat, 21 Apr 2018, Jeffrin Thalakkottoor wrote:
Cc'ing John and Miroslav
hello,
failure of a test in selftest:timers
selftests: raw_skew
WARNING: ADJ_OFFSET in progress, this will cause inaccurate results Estimating clock drift: 17.910(est) 16.820(act) [FAILED] Bail out! Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 1..0 not ok 1..7 selftests: raw_skew [FAIL]
To reproduce :
make -C tools/testing/selftests/timers/ run_tests
Linux debian 4.17.0-rc1+ #3 SMP Sat Apr 21 03:41:44 IST 2018 x86_64 GNU/Linux
GNU Make 4.2.1 Binutils 2.30 Util-linux 2.31.1 Mount 2.31.1 Linux C Library 2.27 Dynamic linker (ldd) 2.27 readlink: missing operand Try 'readlink --help' for more information. Procps 3.3.14 Kbd 2.0.4 Console-tools 2.0.4 Sh-utils 8.28 Udev 238
-- software engineer rajagiri school of engineering and technology
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On Thu, Apr 26, 2018 at 11:28:29PM +0200, Thomas Gleixner wrote:
On Sat, 21 Apr 2018, Jeffrin Thalakkottoor wrote:
selftests: raw_skew
WARNING: ADJ_OFFSET in progress, this will cause inaccurate results Estimating clock drift: 17.910(est) 16.820(act) [FAILED]
Was ntpd, systemd-timesyncd, or some other NTP/PTP daemon running shortly before or during the test?
The warning indicates that the clock was slewed by adjtime() or adjtimex(), which makes the measurement of the frequency less accurate and the test may fail.
Maybe this test and other tests that measure the frequency of the system clock should be modified to SKIP when adjtimex() returns a non-zero offset (or the frequency changes during the test)?
i think may be systemd-timesyncd was running. anyway currently the status is as follows...
$systemctl status systemd-timesyncd.service ● systemd-timesyncd.service - Network Time Synchronization Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled) Active: active (running) since Fri 2018-04-27 19:26:16 IST; 1h 11min ago Docs: man:systemd-timesyncd.service(8) Main PID: 514 (systemd-timesyn) Status: "Synchronized to time server 123.108.200.124:123 (0.debian.pool.ntp.org)." Tasks: 2 (limit: 4382) Memory: 1.8M CGroup: /system.slice/systemd-timesyncd.service └─514 /lib/systemd/systemd-timesyncd $
The test in the latest run show "PASS" see below...
selftests: raw_skew ======================================== Estimating clock drift: 26.836(est) 26.838(act) [OK] Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 1..0 ok 1..7 selftests: raw_skew [PASS]
On Fri, Apr 27, 2018 at 1:11 PM, Miroslav Lichvar mlichvar@redhat.com wrote:
On Thu, Apr 26, 2018 at 11:28:29PM +0200, Thomas Gleixner wrote:
On Sat, 21 Apr 2018, Jeffrin Thalakkottoor wrote:
selftests: raw_skew
WARNING: ADJ_OFFSET in progress, this will cause inaccurate results Estimating clock drift: 17.910(est) 16.820(act) [FAILED]
Was ntpd, systemd-timesyncd, or some other NTP/PTP daemon running shortly before or during the test?
The warning indicates that the clock was slewed by adjtime() or adjtimex(), which makes the measurement of the frequency less accurate and the test may fail.
Maybe this test and other tests that measure the frequency of the system clock should be modified to SKIP when adjtimex() returns a non-zero offset (or the frequency changes during the test)?
-- Miroslav Lichvar
On Sat, Apr 21, 2018 at 7:47 AM, Jeffrin Thalakkottoor jeffrin@rajagiritech.edu.in wrote:
hello,
failure of a test in selftest:timers
selftests: raw_skew
WARNING: ADJ_OFFSET in progress, this will cause inaccurate results Estimating clock drift: 17.910(est) 16.820(act) [FAILED]
So you're ignoring the warning above. If an ADJ_OFFSET operation is going on, ntpd (or something similar) is changing the clock, which will kill the estimated drift calculation.
-john -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
I kind of ignored. i was not sure what that meant actually.
On Fri, Apr 27, 2018 at 3:03 AM, John Stultz john.stultz@linaro.org wrote:
On Sat, Apr 21, 2018 at 7:47 AM, Jeffrin Thalakkottoor jeffrin@rajagiritech.edu.in wrote:
hello,
failure of a test in selftest:timers
selftests: raw_skew
WARNING: ADJ_OFFSET in progress, this will cause inaccurate results Estimating clock drift: 17.910(est) 16.820(act) [FAILED]
So you're ignoring the warning above. If an ADJ_OFFSET operation is going on, ntpd (or something similar) is changing the clock, which will kill the estimated drift calculation.
-john
linux-kselftest-mirror@lists.linaro.org
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Jeffrin Thalakkottoor -
John Stultz -
Miroslav Lichvar -
Thomas Gleixner