On Sun, Mar 12, 2017 at 08:36:19PM +0100, Michael Biebl wrote: > > The stop job for 'Raise network interfaces' fails to complete when > > shutting down or rebooting a fresh stretch install when certain > > conditions are met: > > > > * ATA-over-Ethernet (aoe) kernel module is loaded, and AOE devices are > > listed in /dev/etherd > > * Interface bridging via brctl is used > > > > If either one of these conditions are not satisfied, reboot or shutdown > > will proceed without issue. If both are present, 'Raise network > > interfaces' will repeatedly try to stop, raising the timeout on > > occasion, but will never complete. This means an easy workaround is > > ensuring the 'aoe' kernel module is removed before shutting down or > > rebooting, if no aoe disks are in use at that time, but that can't be > > guaranteed in all situations. > > This looks like something which needs to be looked at by the ifupdown > maintainter, so reassigning accordingly.
This seems to be an issue with the AoE implementation in the kernel. It
correctly keeps an interface busy when an AoE device is mounted over it,
but it handles the teardown very badly.
I'm not sure how you mount the AoE device, but most likely there is
nothing declaring a relationship between it and the bridge interface. So
systemd will not unmount the device before trying to stop the network.
Ifupdown in turn will call brctl delif. I see that this causes the brctl
command to hang. The kernel will repeatedly log this:
unregister_netdevice: waiting for br0 to become free. Usage count = 1
Meanwhile br0 has disappeared from the output of ifconfig. Also, any
access to the mounted device will also hang (because the slaves of the
bridge are down at this point).
Either you have to ensure that systemd unmounts the device before
bringing down the network, or as a workaround you can tell ifupdown to
keep the bridge interface up at shutdown time, by adding something like
this to /etc/network/interfaces:
no-auto-down br0
--
Met vriendelijke groet / with kind regards,
Guus Sliepen <g...@debian.org>
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