Red Hat Bugzilla – Bug 837496
ntpd not keeping hardware clock in sync
Last modified: 2013-08-01 13:21:31 EDT
Description of problem:
Since upgrading from Fedora 15 to 16, I've found that my system's hardware clock is no longer being kept in sync with the system time as maintained by ntpd.
After a month of running Fedora 16, the hardware clock has drifted by 20 seconds. Consequently, every time I reboot, the system time is initially off by 20 seconds until ntpdate and ntpd start (I run both) and correct it.
Syncing the hardware clock manually with "hwclock --systohc" works, but I shouldn't have to do that. Per the hwclock manual, ntpd is supposed to tell the kernel to sync the clock every 11 minutes, but evidently that isn't working. (ntpd does log "kernel time sync enabled" during startup.)
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Confirm ntpd is running and in clock_sync state
2. Run "date; hwclock" and compare the results
hwclock off by 20 seconds in my case
hwclock in sync
You can verify ntpd sets the kernel bit with ntptime, there shouldn't be UNSYNC in the status field.
I think it's a problem in the kernel, there were other reports similar to this.
Is this still happening with the 3.4/3.5 kernels?
# Mass update to all open bugs.
Kernel 3.6.2-1.fc16 has just been pushed to updates.
This update is a significant rebase from the previous version.
Please retest with this kernel, and let us know if your problem has been fixed.
In the event that you have upgraded to a newer release and the bug you reported
is still present, please change the version field to the newest release you have
encountered the issue with. Before doing so, please ensure you are testing the
latest kernel update in that release and attach any new and relevant information
you may have gathered.
If you are not the original bug reporter and you still experience this bug,
please file a new report, as it is possible that you may be seeing a
(Please don't clone this bug, a fresh bug referencing this bug in the comment is sufficient).
With no response, we are closing this bug under the assumption that it is no longer an issue. If you still experience this bug, please feel free to reopen the bug report.
Sorry for the lack of followup before.
The same problem still exists on Fedora 17 with kernel-PAE-3.7.3-101.fc17.i686
I see 1-2 seconds-per-day drift on two systems with different hardware (both running i686.PAE). No special NTP configuration settings are needed to reproduce; simply run "hwclock; date" and observe that the times are not in sync.
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