--- Begin Message ---
Package: release.debian.org
Severity: normal
User: release.debian.org@packages.debian.org
Usertags: unblock
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Dear release team,
Please unblock package chrony
This update solves #854424¹ (severity important) which affect chrony 3.0
(an NTP implementation.) This issue occurs when using the time smoothing
process in interleaved mode and have the nasty effect of decreasing the
timestamps accuracy… which is precisely what interleaved modes should
improve. I left technical information in the bug report to avoid making
that unblock request indigestible, but the proposed fix is quite easy to
review (2 lines); it just consists in including the smoothing offset in
the updated server's transmit timestamp.
The proposed update has been uploaded (thanks to Paul Gevers) and built
successfully on all applicable architectures. Source debdiff attached!
unblock chrony/3.0-3
Cheers,
Vincent
¹https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854424
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diffstat for chrony-3.0 chrony-3.0
changelog | 8 +++++
patches/fix_time_smoothing_in_interleaved_mode.patch | 26 +++++++++++++++++++
patches/series | 1
3 files changed, 35 insertions(+)
diff -Nru chrony-3.0/debian/changelog chrony-3.0/debian/changelog
--- chrony-3.0/debian/changelog 2017-01-18 15:26:31.000000000 +0100
+++ chrony-3.0/debian/changelog 2017-02-07 00:37:24.000000000 +0100
@@ -1,3 +1,11 @@
+chrony (3.0-3) unstable; urgency=medium
+
+ * debian/patches/*:
+ - Backport an upstream patch to fix time smoothing in interleaved mode.
+ (Closes: #854424)
+
+ -- Vincent Blut <vincent.debian@free.fr> Tue, 07 Feb 2017 00:37:24 +0100
+
chrony (3.0-2) unstable; urgency=medium
* debian/chrony.conf:
diff -Nru chrony-3.0/debian/patches/fix_time_smoothing_in_interleaved_mode.patch chrony-3.0/debian/patches/fix_time_smoothing_in_interleaved_mode.patch
--- chrony-3.0/debian/patches/fix_time_smoothing_in_interleaved_mode.patch 1970-01-01 01:00:00.000000000 +0100
+++ chrony-3.0/debian/patches/fix_time_smoothing_in_interleaved_mode.patch 2017-02-05 22:38:22.000000000 +0100
@@ -0,0 +1,26 @@
+Description: Fix time smoothing in interleaved mode
+ When the server's transmit timestamp was updated with a kernel/HW timestamp,
+ it didn't include the time smoothing offset. If the offset was larger than
+ one second, the update failed and clients using the interleaved mode received
+ less accurate timestamps. If the update succeeded, the clients received
+ timestamps that were not adjusted for the time smoothing offset, which added
+ an error of up to 0.5s/1s to their measured offset/delay.
+
+ Fix the update to include the smoothing offset in the new timestamp.
+Author: Miroslav Lichvar <mlichvar@redhat.com>
+Origin: https://git.tuxfamily.org/chrony/chrony.git/commit/?id=da2d33e9a84baa7325503440099dd8f1e567cdd4
+Applied-Upstream: 3.1
+---
+This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
+--- a/ntp_core.c
++++ b/ntp_core.c
+@@ -2016,6 +2016,9 @@ NCR_ProcessTxUnknown(NTP_Remote_Address
+ if (log_index < 0)
+ return;
+
++ if (SMT_IsEnabled() && NTP_LVM_TO_MODE(message->lvm) == MODE_SERVER)
++ UTI_AddDoubleToTimespec(&tx_ts->ts, SMT_GetOffset(&tx_ts->ts), &tx_ts->ts);
++
+ CLG_GetNtpTimestamps(log_index, &local_ntp_rx, &local_ntp_tx);
+
+ if (UTI_IsZeroNtp64(local_ntp_tx))
diff -Nru chrony-3.0/debian/patches/series chrony-3.0/debian/patches/series
--- chrony-3.0/debian/patches/series 2017-01-16 17:33:37.000000000 +0100
+++ chrony-3.0/debian/patches/series 2017-02-05 22:09:43.000000000 +0100
@@ -0,0 +1 @@
+fix_time_smoothing_in_interleaved_mode.patch
--- End Message ---
--- Begin Message ---
Vincent Blut:
> Package: release.debian.org
> Severity: normal
> User: release.debian.org@packages.debian.org
> Usertags: unblock
>
> Dear release team,
>
> Please unblock package chrony
>
> This update solves #854424¹ (severity important) which affect chrony 3.0
> (an NTP implementation.) This issue occurs when using the time smoothing
> process in interleaved mode and have the nasty effect of decreasing the
> timestamps accuracy… which is precisely what interleaved modes should
> improve. I left technical information in the bug report to avoid making
> that unblock request indigestible, but the proposed fix is quite easy to
> review (2 lines); it just consists in including the smoothing offset in
> the updated server's transmit timestamp.
>
> The proposed update has been uploaded (thanks to Paul Gevers) and built
> successfully on all applicable architectures. Source debdiff attached!
>
> unblock chrony/3.0-3
>
> Cheers,
> Vincent
>
>
> ¹https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854424
>
>
Unblocked, thanks.
~Niels
--- End Message ---