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Old 09-16-2008, 09:45 AM
Mihnea-Costin Grigore
 
Default Bug#499297: linux-image-2.6-amd64: excessive time drifts (10sec/min) after kernel upgrade

Package: linux-image-2.6-amd64
Version: 2.6.26+16
Severity: critical
Justification: breaks unrelated software


After upgrading two machines to the latest 2.6.26 kernel from sid, they exhibit extreme time drift (to the order of 10 seconds in a minute), resulting in clocks that are hours out-of-sync after only a day of uptime!
The drift is so bad that ntpd gives up trying to sync the clocks and rejects all sources (it is the same basically with or without ntpd).

The affected systems ran perfectly with the latest 2.6.25 (debian) kernel and the behaviour started only after rebooting with 2.6.26.
These are not production systems, however database activity is severely affected, and so are many other programs that depend on time like VPN software which refuses to establish connections.

I tried manually installing an older 2.6.25 kernel on one of them and the problem went away, so it is definitely something in the latest kernels (didn't try previous 2.6.26 versions).

-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages linux-image-2.6-amd64 depends on:
ii linux-image-2.6.26-1-amd64 2.6.26-5 Linux 2.6.26 image on AMD64

linux-image-2.6-amd64 recommends no packages.

linux-image-2.6-amd64 suggests no packages.

-- no debconf information



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Old 09-17-2008, 03:57 PM
Bastian Blank
 
Default Bug#499297: linux-image-2.6-amd64: excessive time drifts (10sec/min) after kernel upgrade

On Tue, Sep 16, 2008 at 12:45:43PM +0300, Mihnea-Costin Grigore wrote:
> -- System Information:
> Debian Release: lenny/sid
> APT prefers unstable
> APT policy: (500, 'unstable')
> Architecture: amd64 (x86_64)

Complete kernel log (dmesg). /proc/version. ntp log. /proc/taint.

Bastian

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