Comment 16 for bug 457702

Hey guys,

we are currently facing the same problem, or at least something relaited.

We use an Xubuntu 10.04.1 Server (amd64) with i386-Clients. LTSP 5.2.1ubuntu9 and separate (Windows) DHCP-Server.
If the LTSP-server gets down, no matter if shutdown, reboot, hard shutdown etc. the clients waits for around 1 minute (mostly less) and starts then giving the above mentioned errors ...

First ...
[ 57.955127] nbd0: Attempted send on closed socket
[ 57.959994] end_request: I/O error, dev nbd0, sector 416250

and then ...

[ 57.965709] SQUASHFS error: squashfs_read_data failed to read block 0xcb3f6c9
[ 57.972983] SQUASHFS error: Unable to read metadata cache entry [cb3f6c9]
[ 57.979941] SQUASHFS error: Unable to read directory block [cb3f6c9:193c]
... to infinity ...

sligthly different IDs etc but the rest is identical. The client continues with that until i shut him down manually (pulling the plug) or try to login with SSH. The authentication/login works, but you never get a prompt, just sometimes an "Input/Output Error". The client hangs then completly and also stops giving above errors. Sometimes it already hangs earlier and SSH is not reachable.

With an hardware-server which takes about 4 minutes to boot (loooots of RAM to count) we faced that first. With an virtual Server (VMware) reboots just takes seconds and the clients reboot automaticlly when the server is back running. If i pause the boot, we have the same behavier of the clients like with the hardware-server.

As above is written the bug is fixed an we use a much newer version, i was really confused why in our .../initramfs/scripts/ltsp_nbd file the fix is not implemented? But even if I add the fix manually the problem stays.

Any solution? We have already an older Server with Ubuntu 8.04 (32Bit) and 15 Clients running without such problems.