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The purpose of this test is to verify leap second operation with ntp.  This is done
by artificially setting the leap second offset in gpsd.  ntp is not modified.
Software levels:
    gpsd - 3.16-m2.9 + the Aug 31 test patch
    ntp - 4.2.8p9-r0.mlinux3.0.  Release candidate for mLinux 4.0

ntpd leap second test  gpsd artificially causes a leap second on Aug 31, 2017 23:59:59 UTC.

The patch for this test is leap2017Aug31.patch.  This patch replaces 0006-ubxtimelps.patch.


Kernel Log:

2017-07-31T18:50:02.012018-05:00 leaptest CROND[5205]: (root) CMD (/usr/sbin/logrotate /etc/logrotate.conf)
2017-07-31T18:55:01.119140-05:00 leaptest CROND[5223]: (root) CMD (/usr/sbin/logrotate /etc/logrotate.conf)
2017-07-31T18:59:59.016393-05:00 leaptest kernel: Clock: inserting leap second 23:59:60 UTC
2017-07-31T19:00:01.215873-05:00 leaptest CROND[5240]: (root) CMD (/usr/sbin/logrotate /etc/logrotate.conf)
2017-07-31T19:00:07.381218-05:00 leaptest ntpd[501]: kernel reports leap second has occurred
2017-07-31T19:00:07.381528-05:00 leaptest ntpd[501]: kernel reports leap second has occurred
2017-07-31T19:05:01.313170-05:00 leaptest CROND[5258]: (root) CMD (/usr/sbin/logrotate /etc/logrotate.conf)


Time log from user space.  18:59:59 repeats twice 19:00:00 appears only  once.:

2017-07-31T18:59:57.855895-05:00 leaptest CTST: epoch: 1501545597.855  boot: 442607.123
2017-07-31T18:59:58.106318-05:00 leaptest CTST: epoch: 1501545598.106  boot: 442607.373
2017-07-31T18:59:58.356758-05:00 leaptest CTST: epoch: 1501545598.356  boot: 442607.624
2017-07-31T18:59:58.607171-05:00 leaptest CTST: epoch: 1501545598.606  boot: 442607.874
2017-07-31T18:59:58.857621-05:00 leaptest CTST: epoch: 1501545598.857  boot: 442608.124
2017-07-31T18:59:59.108072-05:00 leaptest CTST: epoch: 1501545599.107  boot: 442608.375
2017-07-31T18:59:59.358506-05:00 leaptest CTST: epoch: 1501545599.358  boot: 442608.625
2017-07-31T18:59:59.608952-05:00 leaptest CTST: epoch: 1501545599.608  boot: 442608.876
2017-07-31T18:59:59.859364-05:00 leaptest CTST: epoch: 1501545599.859  boot: 442609.126
2017-07-31T18:59:59.109780-05:00 leaptest CTST: epoch: 1501545599.109  boot: 442609.377
2017-07-31T18:59:59.360195-05:00 leaptest CTST: epoch: 1501545599.359  boot: 442609.627
2017-07-31T18:59:59.610608-05:00 leaptest CTST: epoch: 1501545599.610  boot: 442609.877
2017-07-31T18:59:59.861023-05:00 leaptest CTST: epoch: 1501545599.860  boot: 442610.128
2017-07-31T19:00:00.111461-05:00 leaptest CTST: epoch: 1501545600.111  boot: 442610.378
2017-07-31T19:00:00.361916-05:00 leaptest CTST: epoch: 1501545600.361  boot: 442610.629
2017-07-31T19:00:00.612329-05:00 leaptest CTST: epoch: 1501545600.612  boot: 442610.879
2017-07-31T19:00:00.862825-05:00 leaptest CTST: epoch: 1501545600.862  boot: 442611.130
2017-07-31T19:00:01.113251-05:00 leaptest CTST: epoch: 1501545601.112  boot: 442611.380
2017-07-31T19:00:01.363695-05:00 leaptest CTST: epoch: 1501545601.363  boot: 442611.630
2017-07-31T19:00:01.614114-05:00 leaptest CTST: epoch: 1501545601.613  boot: 442611.881
2017-07-31T19:00:01.864524-05:00 leaptest CTST: epoch: 1501545601.864  boot: 442612.131



Leap second flag set artifically by gpsd, and noticed by ntp (leap=01 for SHM(0) and SHM(2) and leap_armed):
2017-07-31T18:59:22.952281-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T18:59:22.962756-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum
2017-07-31T18:59:22.964152-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T18:59:23.130829-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt
2017-07-31T18:59:23.131062-05:00 leaptest ntpstatus.sh: ===========================================================
2017-07-31T18:59:23.131258-05:00 leaptest ntpstatus.sh:   1 18654  943a   yes   yes  none candidate    sys_peer  3
2017-07-31T18:59:23.131451-05:00 leaptest ntpstatus.sh:   2 18655  9649   yes   yes  none  sys.peer  leap_armed  4
2017-07-31T18:59:23.131647-05:00 leaptest ntpstatus.sh:   3 18656  8011   yes    no  none    reject    mobilize  1
2017-07-31T18:59:23.131840-05:00 leaptest ntpstatus.sh: srcadr=SHM(0), leap=01, stratum=0
2017-07-31T18:59:23.132031-05:00 leaptest ntpstatus.sh: srcadr=SHM(2), leap=01, stratum=0
2017-07-31T18:59:23.132220-05:00 leaptest ntpstatus.sh: srcadr=LOCAL(0), leap=11, stratum=14
2017-07-31T18:59:23.138000-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T18:59:23.138206-05:00 leaptest ntpstatus.sh: ntpq -p
2017-07-31T18:59:23.138404-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T18:59:23.434429-05:00 leaptest ntpstatus.sh:      remote           refid      st t when poll reach   delay   offset  jitter
2017-07-31T18:59:23.434666-05:00 leaptest ntpstatus.sh: ==============================================================================
2017-07-31T18:59:23.434863-05:00 leaptest ntpstatus.sh: +SHM(0)          .GPS.            0 l   20   64  377    0.000    6.410   1.265
2017-07-31T18:59:23.435055-05:00 leaptest ntpstatus.sh: *SHM(2)          .PPS.            0 l   19   64  377    0.000    0.062   0.008
2017-07-31T18:59:23.435249-05:00 leaptest ntpstatus.sh:  LOCAL(0)        .LOCL.          14 l    -   32    0    0.000    0.000   0.000
2017-07-31T19:00:22.459905-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:00:22.460141-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum



2017-07-31T19:00:22.460343-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:00:22.618627-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt
2017-07-31T19:00:22.618857-05:00 leaptest ntpstatus.sh: ===========================================================
2017-07-31T19:00:22.619057-05:00 leaptest ntpstatus.sh:   1 18654  943a   yes   yes  none candidate    sys_peer  3
2017-07-31T19:00:22.619252-05:00 leaptest ntpstatus.sh:   2 18655  9649   yes   yes  none  sys.peer  leap_armed  4
2017-07-31T19:00:22.619444-05:00 leaptest ntpstatus.sh:   3 18656  8011   yes    no  none    reject    mobilize  1
2017-07-31T19:00:22.619634-05:00 leaptest ntpstatus.sh: srcadr=SHM(0), leap=01, stratum=0
2017-07-31T19:00:22.619824-05:00 leaptest ntpstatus.sh: srcadr=SHM(2), leap=01, stratum=0
2017-07-31T19:00:22.620016-05:00 leaptest ntpstatus.sh: srcadr=LOCAL(0), leap=11, stratum=14
2017-07-31T19:00:22.628414-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:00:22.628654-05:00 leaptest ntpstatus.sh: ntpq -p
2017-07-31T19:00:22.628868-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:00:22.922779-05:00 leaptest ntpstatus.sh:      remote           refid      st t when poll reach   delay   offset  jitter
2017-07-31T19:00:22.924191-05:00 leaptest ntpstatus.sh: ==============================================================================
2017-07-31T19:00:22.925595-05:00 leaptest ntpstatus.sh: +SHM(0)          .GPS.            0 l   16   64  377    0.000    7.369   0.661
2017-07-31T19:00:22.927000-05:00 leaptest ntpstatus.sh: *SHM(2)          .PPS.            0 l   15   64  377    0.000    0.059   0.008
2017-07-31T19:00:22.928402-05:00 leaptest ntpstatus.sh:  LOCAL(0)        .LOCL.          14 l    -   32    0    0.000    0.000   0.000
2017-07-31T19:01:22.942937-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:22.943171-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum
2017-07-31T19:01:22.943371-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:23.118319-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt
2017-07-31T19:01:23.118551-05:00 leaptest ntpstatus.sh: ===========================================================
2017-07-31T19:01:23.118750-05:00 leaptest ntpstatus.sh:   1 18654  943a   yes   yes  none candidate    sys_peer  3
2017-07-31T19:01:23.118943-05:00 leaptest ntpstatus.sh:   2 18655  9649   yes   yes  none  sys.peer  leap_armed  4
2017-07-31T19:01:23.119137-05:00 leaptest ntpstatus.sh:   3 18656  8011   yes    no  none    reject    mobilize  1
2017-07-31T19:01:23.119330-05:00 leaptest ntpstatus.sh: srcadr=SHM(0), leap=01, stratum=0
2017-07-31T19:01:23.119520-05:00 leaptest ntpstatus.sh: srcadr=SHM(2), leap=01, stratum=0
2017-07-31T19:01:23.119710-05:00 leaptest ntpstatus.sh: srcadr=LOCAL(0), leap=11, stratum=14
2017-07-31T19:01:23.128565-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:23.128809-05:00 leaptest ntpstatus.sh: ntpq -p
2017-07-31T19:01:23.129026-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:23.417707-05:00 leaptest ntpstatus.sh:      remote           refid      st t when poll reach   delay   offset  jitter
2017-07-31T19:01:23.417942-05:00 leaptest ntpstatus.sh: ==============================================================================
2017-07-31T19:01:23.418140-05:00 leaptest ntpstatus.sh: +SHM(0)          .GPS.            0 l   13   64  377    0.000  1007.48 1000.36
2017-07-31T19:01:23.418337-05:00 leaptest ntpstatus.sh: *SHM(2)          .PPS.            0 l   12   64  377    0.000  1000.05 999.994
2017-07-31T19:01:23.418529-05:00 leaptest ntpstatus.sh:  LOCAL(0)        .LOCL.          14 l    -   32    0    0.000    0.000   0.000
2017-07-31T19:02:23.442898-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:02:23.443131-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum
2017-07-31T19:02:23.443332-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:02:23.617413-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt


Offset goes to one second, because there was no leap second:
2017-07-31T19:00:22.618857-05:00 leaptest ntpstatus.sh: ===========================================================
2017-07-31T19:00:22.619057-05:00 leaptest ntpstatus.sh:   1 18654  943a   yes   yes  none candidate    sys_peer  3
2017-07-31T19:00:22.619252-05:00 leaptest ntpstatus.sh:   2 18655  9649   yes   yes  none  sys.peer  leap_armed  4
2017-07-31T19:00:22.619444-05:00 leaptest ntpstatus.sh:   3 18656  8011   yes    no  none    reject    mobilize  1
2017-07-31T19:00:22.619634-05:00 leaptest ntpstatus.sh: srcadr=SHM(0), leap=01, stratum=0
2017-07-31T19:00:22.619824-05:00 leaptest ntpstatus.sh: srcadr=SHM(2), leap=01, stratum=0
2017-07-31T19:00:22.620016-05:00 leaptest ntpstatus.sh: srcadr=LOCAL(0), leap=11, stratum=14
2017-07-31T19:00:22.628414-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:00:22.628654-05:00 leaptest ntpstatus.sh: ntpq -p
2017-07-31T19:00:22.628868-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:00:22.922779-05:00 leaptest ntpstatus.sh:      remote           refid      st t when poll reach   delay   offset  jitter
2017-07-31T19:00:22.924191-05:00 leaptest ntpstatus.sh: ==============================================================================
2017-07-31T19:00:22.925595-05:00 leaptest ntpstatus.sh: +SHM(0)          .GPS.            0 l   16   64  377    0.000    7.369   0.661
2017-07-31T19:00:22.927000-05:00 leaptest ntpstatus.sh: *SHM(2)          .PPS.            0 l   15   64  377    0.000    0.059   0.008
2017-07-31T19:00:22.928402-05:00 leaptest ntpstatus.sh:  LOCAL(0)        .LOCL.          14 l    -   32    0    0.000    0.000   0.000
2017-07-31T19:01:22.942937-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:22.943171-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum
2017-07-31T19:01:22.943371-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:23.118319-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt
2017-07-31T19:01:23.118551-05:00 leaptest ntpstatus.sh: ===========================================================
2017-07-31T19:01:23.118750-05:00 leaptest ntpstatus.sh:   1 18654  943a   yes   yes  none candidate    sys_peer  3
2017-07-31T19:01:23.118943-05:00 leaptest ntpstatus.sh:   2 18655  9649   yes   yes  none  sys.peer  leap_armed  4
2017-07-31T19:01:23.119137-05:00 leaptest ntpstatus.sh:   3 18656  8011   yes    no  none    reject    mobilize  1
2017-07-31T19:01:23.119330-05:00 leaptest ntpstatus.sh: srcadr=SHM(0), leap=01, stratum=0
2017-07-31T19:01:23.119520-05:00 leaptest ntpstatus.sh: srcadr=SHM(2), leap=01, stratum=0
2017-07-31T19:01:23.119710-05:00 leaptest ntpstatus.sh: srcadr=LOCAL(0), leap=11, stratum=14
2017-07-31T19:01:23.128565-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:23.128809-05:00 leaptest ntpstatus.sh: ntpq -p
2017-07-31T19:01:23.129026-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:01:23.417707-05:00 leaptest ntpstatus.sh:      remote           refid      st t when poll reach   delay   offset  jitter
2017-07-31T19:01:23.417942-05:00 leaptest ntpstatus.sh: ==============================================================================
2017-07-31T19:01:23.418140-05:00 leaptest ntpstatus.sh: +SHM(0)          .GPS.            0 l   13   64  377    0.000  1007.48 1000.36
2017-07-31T19:01:23.418337-05:00 leaptest ntpstatus.sh: *SHM(2)          .PPS.            0 l   12   64  377    0.000  1000.05 999.994
2017-07-31T19:01:23.418529-05:00 leaptest ntpstatus.sh:  LOCAL(0)        .LOCL.          14 l    -   32    0    0.000    0.000   0.000
2017-07-31T19:02:23.442898-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:02:23.443131-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum
2017-07-31T19:02:23.443332-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:02:23.617413-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt


Leap second flag is clear, leap_armed is removed so no leap second on Aug 1, 2017:
2017-07-31T19:38:42.630432-05:00 leaptest ntpstatus.sh: ntpq -c lassoc -c mrv &1 &999 leap,srcadr,stratum
2017-07-31T19:38:42.630636-05:00 leaptest ntpstatus.sh: ==========================================================
2017-07-31T19:38:42.791369-05:00 leaptest ntpstatus.sh: ind assid status  conf reach auth condition  last_event cnt
2017-07-31T19:38:42.791605-05:00 leaptest ntpstatus.sh: ===========================================================
2017-07-31T19:38:42.791803-05:00 leaptest ntpstatus.sh:   1 18654  945a   yes   yes  none candidate    sys_peer  5
2017-07-31T19:38:42.791994-05:00 leaptest ntpstatus.sh:   2 18655  966a   yes   yes  none  sys.peer    sys_peer  6
2017-07-31T19:38:42.792189-05:00 leaptest ntpstatus.sh:   3 18656  8033   yes    no  none    reject unreachable  3
2017-07-31T19:38:42.792379-05:00 leaptest ntpstatus.sh: srcadr=SHM(0), leap=00, stratum=0
2017-07-31T19:38:42.802875-05:00 leaptest ntpstatus.sh: srcadr=SHM(2), leap=00, stratum=0
2017-07-31T19:38:42.804254-05:00 leaptest ntpstatus.sh: srcadr=LOCAL(0), leap=00, stratum=14