- Taking a Xenial and a Artful VM
- Installing ntp
- Check status of ntp
- running fine on both systems
- Reboot the VM
- Check status of ntp
- still ntp service ok on both systems
- install ntpdate
- Check status of ntp
- still ntp service ok on both systems
- reboot
- Check status of ntp
- failed for blocked known address being busy on both
- reboot (to check reproducibility)
- Check status of ntp
- failed for blocked known address being busy on both
- Adding two extra devices in libvirt and configuring it on the guest
- restart
- Check status of ntp
- failed for blocked known address being busy on both (likely even at a
higher "risk")
ntp init mechanims:
Xenial: /etc/init.d/ntp locks LOCKFILE=/var/lock/ntpdate
Artful: /usr/lib/ntp/ntp-systemd-wrapper locks nothing at all
This races against the following hook (in both releases):
/etc/network/if-up.d/ntpdate which locks /run/lock/ntpdate
Seems reproducible enough to me, actually much better reproducible than in the
past.
I checked and our recent cleanup of the mess around debian/ntpdate.if-up fixed
a lot of things.
Among other it removed an accidential restart of ntp which kind of hid this
issue here (no regression-update, just an issue existing before now more likely
to be hit).
But now with things no more that racy the fix is easy and much better
testable.
** Changed in: ntp (Ubuntu Xenial)
Status: New => Confirmed
** Changed in: ntp (Ubuntu)
Status: Fix Released => Confirmed
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https://bugs.launchpad.net/bugs/1706818
Title:
mismatched file locking since 1:4.2.8p4+dfsg-3ubuntu1 causes race
leaving ntp dead on reboot
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