[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Timo Aaltonen]

the patch has not been sent upstream yet?

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Louis Bouchard]

** Tags removed: sts-sru
** Tags added: sts-sru-done

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Launchpad Bug Tracker]

This bug was fixed in the package sssd - 1.11.8-0ubuntu0.5

---
sssd (1.11.8-0ubuntu0.5) trusty; urgency=medium

  * d/p/BUILD-Fix-linking-with-librt.patch: Upstream fix for FTBS on
ppc64el/arm64 after the implementation of timer functions in watchdog
(LP: #1641875).

 -- Victor Tapia   Tue, 28 Feb 2017 10:20:19
+0100

** Changed in: sssd (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Launchpad Bug Tracker]

This bug was fixed in the package sssd - 1.13.4-3ubuntu0.1

---
sssd (1.13.4-3ubuntu0.1) yakkety; urgency=medium

  * d/p/restart_providers_on_timeshift.patch: Implement watchdog and
use SIGUSR2 after watchdog detects time shift to execute pending
scheduled tasks that could be stuck (LP: #1641875)

 -- Victor Tapia   Thu, 23 Feb 2017 11:20:43
+0100

** Changed in: sssd (Ubuntu Yakkety)
   Status: Fix Committed => Fix Released

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Launchpad Bug Tracker]

This bug was fixed in the package sssd - 1.13.4-1ubuntu1.2

---
sssd (1.13.4-1ubuntu1.2) xenial; urgency=medium

  * d/p/restart_providers_on_timeshift.patch: Implement watchdog and
use SIGUSR2 after watchdog detects time shift to execute pending
scheduled tasks that could be stuck (LP: #1641875)

 -- Victor Tapia   Thu, 23 Feb 2017 11:46:31
+0100

** Changed in: sssd (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

# VERIFICATION FOR T

Same script as for X, works as expected:

(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [fo_resolve_service_send] 
(0x0100): Trying to resolve service 'LDAP'
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'not working'
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'not working'
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [fo_resolve_service_send] 
(0x0020): No available servers for service 'LDAP'
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [be_resolve_server_done] 
(0x1000): Server resolution failed: 5
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [sdap_id_op_connect_done] 
(0x0020): Failed to connect, going offline (5 [Input/output error])
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [be_mark_offline] 
(0x2000): Going offline!
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [be_ptask_create] 
(0x0400): Periodic task [Check if online (periodic)] was created
(Mon Mar  6 04:31:25 2017) [sssd[be[openstacklocal]]] [be_ptask_schedule] 
(0x0400): Task [Check if online (periodic)]: scheduling task 69 seconds from 
now [1488774754]
...
(Mon Mar  6 03:31:00 2017) [sssd[be[openstacklocal]]] 
[watchdog_fd_read_handler] (0x0040): Time shift detected, restarting watchdog!
...
(Mon Mar  6 03:31:41 2017) [sssd[be[openstacklocal]]] [fo_resolve_service_send] 
(0x0100): Trying to resolve service 'LDAP'
(Mon Mar  6 03:31:41 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'name not resolved'
(Mon Mar  6 03:31:41 2017) [sssd[be[openstacklocal]]] [get_port_status] 
(0x1000): Port status of port 389 for server 'ldap' is 'neutral'
(Mon Mar  6 03:31:41 2017) [sssd[be[openstacklocal]]] 
[fo_resolve_service_activate_timeout] (0x2000): Resolve timeout set to 6 seconds
(Mon Mar  6 03:31:41 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'name not resolved'
(Mon Mar  6 03:31:41 2017) [sssd[be[openstacklocal]]] [resolv_is_address] 
(0x4000): [ldap] does not look like an IP address


** Tags removed: verification-done-xenial verification-done-yakkety 
verification-needed
** Tags added: verification-done

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

# VERIFICATION FOR X

After running the following script (repro.sh), the log shows the LDAP
resolution is rescheduled:

#!/bin/bash

change_time() {
sudo systemctl stop systemd-timesyncd
HOUR=$(date +%H)
MIN=$(date +%M)
NEW=$((10#$HOUR - 1))

sudo date --set "${NEW}:${MIN}"
echo "Setting time to ${NEW}:${MIN}"
}

sudo systemctl restart sssd
sleep 20
change_time


Excerpts from /var/log/sssd/sssd_openstacklocal.log:

(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [fo_resolve_service_send] 
(0x0100): Trying to resolve service 'LDAP'
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'not working'
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'not working'
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [fo_resolve_service_send] 
(0x0020): No available servers for service 'LDAP'
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_resolve_server_done] 
(0x1000): Server resolution failed: 5
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [sdap_id_op_connect_done] 
(0x0020): Failed to connect, going offline (5 [Input/output error])
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_mark_offline] 
(0x2000): Going offline!
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_mark_offline] 
(0x2000): Initialize check_if_online_ptask.
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_ptask_create] 
(0x0400): Periodic task [Check if online (periodic)] was created
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_ptask_schedule] 
(0x0400): Task [Check if online (periodic)]: scheduling task 63 seconds from 
now [1488462456]
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_run_offline_cb] 
(0x0080): Going offline. Running callbacks.
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [sdap_id_op_connect_done] 
(0x4000): notify offline to op #1
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] 
[sdap_dom_enum_ex_connected] (0x0400): Backend is marked offline, retry later!
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_ptask_done] (0x0400): 
Task [enumeration]: finished successfully
(Thu Mar  2 13:46:33 2017) [sssd[be[openstacklocal]]] [be_ptask_schedule] 
(0x0400): Task [enumeration]: scheduling task 300 seconds from last execution 
time [1488462691]

(Thu Mar  2 12:46:00 2017) [sssd[be[openstacklocal]]] 
[watchdog_fd_read_handler] (0x0040): Time shift detected, restarting watchdog!
* Some initialization log entries
(Thu Mar  2 12:46:40 2017) [sssd[be[openstacklocal]]] [fo_resolve_service_send] 
(0x0100): Trying to resolve service 'LDAP'
(Thu Mar  2 12:46:40 2017) [sssd[be[openstacklocal]]] [get_server_status] 
(0x1000): Status of server 'ldap' is 'name not resolved'
(Thu Mar  2 12:46:40 2017) [sssd[be[openstacklocal]]] [get_port_status] 
(0x1000): Port status of port 389 for server 'ldap' is 'neutral'
(Thu Mar  2 12:46:40 2017) [sssd[be[openstacklocal]]] 
[fo_resolve_service_activate_timeout] (0x2000): Resolve timeout set to 6 seconds


** Tags added: verification-done-xenial verification-done-yakkety

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Patch removed: "trusty-sssd_1.11.8-0ubuntu0.5.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4826011/+files/trusty-sssd_1.11.8-0ubuntu0.5.debdiff

** Patch added: "trusty-sssd_1.11.8-0ubuntu0.5.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4828066/+files/trusty-sssd_1.11.8-0ubuntu0.5.debdiff

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Patch added: "librt link fix"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4826011/+files/trusty-sssd_1.11.8-0ubuntu0.5.debdiff

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Brian Murray]

Hello Victor, or anyone else affected,

Accepted sssd into yakkety-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/sssd/1.13.4-3ubuntu0.1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: sssd (Ubuntu Yakkety)
   Status: Triaged => Fix Committed

** Tags added: verification-needed

** Changed in: sssd (Ubuntu Xenial)
   Status: Triaged => Fix Committed

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Louis Bouchard]

Fixed debdiff used for sponsorship (fixed versionning to stay coherent
with other releases)

** Patch added: "yakkety-sssd_1.13.4-3ubuntu0.1.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4825142/+files/yakkety-sssd_1.13.4-3ubuntu0.1.debdiff

** Patch removed: "yakkety-sssd_1.13.4-3ubuntu1.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4824488/+files/yakkety-sssd_1.13.4-3ubuntu1.debdiff

** Tags removed: sts-sponsor

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Patch added: "trusty-sssd_1.11.8-0ubuntu0.4.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4824602/+files/trusty-sssd_1.11.8-0ubuntu0.4.debdiff

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Patch added: "xenial-sssd_1.13.4-1ubuntu1.2.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4824489/+files/xenial-sssd_1.13.4-1ubuntu1.2.debdiff

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Patch added: "yakkety-sssd_1.13.4-3ubuntu1.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4824488/+files/yakkety-sssd_1.13.4-3ubuntu1.debdiff

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Launchpad Bug Tracker]

This bug was fixed in the package sssd - 1.15.0-3ubuntu3

---
sssd (1.15.0-3ubuntu3) zesty; urgency=medium

  * d/p/restart_providers_on_timeshift.patch: Use SIGUSR2 after watchdog
detects time shift to execute pending scheduled tasks that could
be stuck (LP: #1641875)

 -- Victor Tapia   Wed, 15 Feb 2017 17:05:05
+0100

** Changed in: sssd (Ubuntu Zesty)
   Status: In Progress => Fix Released

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Louis Bouchard]

** Changed in: sssd (Ubuntu Zesty)
   Status: New => In Progress

** Changed in: sssd (Ubuntu Yakkety)
   Status: New => Triaged

** Changed in: sssd (Ubuntu Xenial)
   Status: New => Triaged

** Changed in: sssd (Ubuntu Trusty)
   Status: New => Triaged

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Patch added: "zesty_sssd_1.15.0-3ubuntu3.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1641875/+attachment/4819666/+files/zesty_sssd_1.15.0-3ubuntu3.debdiff

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  Scheduled events (e.g. LDAP connection retries) are affected by clock
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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Changed in: sssd (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: sssd (Ubuntu Yakkety)
   Importance: Undecided => Medium

** Changed in: sssd (Ubuntu Zesty)
   Importance: Undecided => Medium

** Changed in: sssd (Ubuntu Xenial)
   Importance: Undecided => Medium

** Tags added: sts-sponsor sts-sru

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Description changed:

+ [Impact]
  
- When SSSD fails to connect to a provider (LDAP, for instance) it creates a 
timed event with tevent_add_timer() in order to retry in ~1 min. Tevent relies 
on CLOCK_REALTIME, using absolute epoch time, so when the time changes (e.g. 
NTP sync) the scheduled event is affected.
+  * SSSD is affected by clock shifts because it's built on libtevent, that 
doesn't use monotonic clocks. 
+  * After an event has been scheduled, if the time drifts to the past SSSD 
won't recover and the event will have to wait the shifted time to be executed.
+ 
+ [Test Case]
+ 
+  * Modify the /etc/hosts file to force a failed resolution and restart sssd.
+  * Within the first ~1 minute retry window, change the date (date --set) to a 
previous time (e.g. 2h).
+  * "Tail" the log file. The event will be executed at the original schedule, 
past those 2h.
+ 
+ [Regression Potential]
+ 
+  * None
+ 
+ [Other Info]
+ 
+  * Version 1.15 implements a watchdog that detects time shifts and resets 
itselft but doesn't reschedule the scheduled events.
+  * There's a network monitor based on netlink that detects interface changes 
and restarts the providers, rescheduling the scheduled events.
+  * Such restart can be triggered with SIGUSR2. Sending that signal after the 
watchdog restarts fixes this issue.
+  * Upstream bug: https://fedorahosted.org/sssd/ticket/3285 
+ 
+ [Original Description]
+ 
+ When SSSD fails to connect to a provider (LDAP, for instance) it creates
+ a timed event with tevent_add_timer() in order to retry in ~1 min.
+ Tevent relies on CLOCK_REALTIME, using absolute epoch time, so when the
+ time changes (e.g. NTP sync) the scheduled event is affected.
  
  Reproducer:
  
  1. Modify the /etc/hosts file to force a failed resolution and restart
  sssd
  
- (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] 
[resolv_gethostbyname_dns_query] (0x0100): Trying to resolve A record of 'ldap' 
in DNS 
- (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] 
[resolv_gethostbyname_done] (0x0040): querying hosts database failed [5]: 
Input/output error 
- (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] 
[fo_resolve_service_done] (0x0020): Failed to resolve server 'ldap': Could not 
contact DNS servers 
- ... 
- (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] [check_online_callback] 
(0x0100): Backend returned: (1, 0, ) [Provider is Offline] 
+ (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] 
[resolv_gethostbyname_dns_query] (0x0100): Trying to resolve A record of 'ldap' 
in DNS
+ (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] 
[resolv_gethostbyname_done] (0x0040): querying hosts database failed [5]: 
Input/output error
+ (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] 
[fo_resolve_service_done] (0x0020): Failed to resolve server 'ldap': Could not 
contact DNS servers
+ ...
+ (Tue Oct 25 09:37:14 2016) [sssd[be[openstacklocal]]] [check_online_callback] 
(0x0100): Backend returned: (1, 0, ) [Provider is Offline]
  
  2. Within the ~1 minute window, change the date (date --set) to a
  previous time (2 hour in my example). Note: if /etc/resolv.conf or a
  network interface is modified, SSSD providers will restart, but the
  scheduled retry will be kept.
  
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [recreate_ares_channel] 
(0x0100): Initializing new c-ares channel 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [recreate_ares_channel] 
(0x0100): Destroying the old c-ares channel 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] 
[set_server_common_status] (0x0100): Marking server 'ldap' as 'name not 
resolved' 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [fo_set_port_status] 
(0x0100): Marking port 389 of server 'ldap' as 'neutral' 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] 
[fo_resolve_service_send] (0x0100): Trying to resolve service 'LDAP' 
- ... 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] 
[fo_resolve_service_done] (0x0020): Failed to resolve server 'ldap': Could not 
contact DNS servers 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] 
[set_server_common_status] (0x0100): Marking server 'ldap' as 'not working' 
- ... 
- (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [check_online_callback] 
(0x0100): Backend returned: (1, 0, ) [Provider is Offline] 
+ (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [recreate_ares_channel] 
(0x0100): Initializing new c-ares channel
+ (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [recreate_ares_channel] 
(0x0100): Destroying the old c-ares channel
+ (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] 
[set_server_common_status] (0x0100): Marking server 'ldap' as 'name not 
resolved'
+ (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] [fo_set_port_status] 
(0x0100): Marking port 389 of server 'ldap' as 'neutral'
+ (Tue Oct 25 07:41:46 2016) [sssd[be[openstacklocal]]] 
[fo_resolve_service_send] (0x0100): Trying to resolve 

[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Victor Tapia]

** Changed in: sssd (Ubuntu Trusty)
 Assignee: (unassigned) => Victor Tapia (vtapia)

** Changed in: sssd (Ubuntu Xenial)
 Assignee: (unassigned) => Victor Tapia (vtapia)

** Changed in: sssd (Ubuntu Yakkety)
 Assignee: (unassigned) => Victor Tapia (vtapia)

** Changed in: sssd (Ubuntu Zesty)
 Assignee: (unassigned) => Victor Tapia (vtapia)

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Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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[Bug 1641875] Re: Scheduled events (e.g. LDAP connection retries) are affected by clock adjustments

[Louis Bouchard]

** Also affects: sssd (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Also affects: sssd (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: sssd (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** Also affects: sssd (Ubuntu Yakkety)
   Importance: Undecided
   Status: New

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https://bugs.launchpad.net/bugs/1641875

Title:
  Scheduled events (e.g. LDAP connection retries) are affected by clock
  adjustments

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