[Bug 604314] Re: Kernel deadlock when running programs from aufs over squashfs

[Steve Rippl]

We're experiencing this too, here's a report from the tech that builds
our LTSP servers which includes the network equipment we're using.
Applying the patch (disabling nbd-proxy) doesn't completely solve things
for us. We had none of these problems on 9.04.

=======

When 2 or more switches are between client and server a failure to boot
occurs before launching LDM about %50 of the time. The frequency of the
failure to boot is reduced by being connected to the server with only
one intermediate switch but does not go away completely. The following
bugs seem to reference the same problem and indicate that it is
nbd-proxy that is falling down during the boot process.

https://bugs.launchpad.net/ubuntu/+source/ltsp/+bug/604314
https://bugs.launchpad.net/ltsp/+bug/589034

The latter of these references a patch that when applied disables the
activation of the nbd-proxy during the client setup process. My success
rate for booting clients after applying this patch rises to about %70.
Load seems to effect this condition adversely as well as speed and
duplex transitions such as many 10/100 clients connecting to a server
attached to a gigabit port. The clients in question are Atom based and
include gigabit ethernet ports but are connected to 10/100 ports in the
classroom. Switches being used include HP Pro-curve edge products as
well as a variety of unmanaged 10/100 5-8 port switches.

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Kernel deadlock when running programs from aufs over squashfs
https://bugs.launchpad.net/bugs/604314
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