[Bug 683103] Re: Clients hang on server-reboot/shutdown ...

[Alkis Georgopoulos]

*** This bug is a duplicate of bug 107526 ***
    https://bugs.launchpad.net/bugs/107526

** This bug has been marked a duplicate of bug 107526
   rebooting ltsp server leaves client stuck

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https://bugs.launchpad.net/bugs/683103

Title:
  Clients hang on server-reboot/shutdown ...

Status in “ltsp” package in Ubuntu:
  Confirmed

Bug description:
  Hey guys,

  we are currently facing a problem, similar or relaited to the bug
  #457702 (https://bugs.launchpad.net/ubuntu/+source/ltsp/+bug/457702).
  I posted also there, but didn't know if anyone would follow it as the
  bug "should" be fixed ... as we still have that problem the is still
  some fixes to do.

  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, sometimes with splash-screen) and starts 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 LTSP Ubuntu 8.04
  (32Bit) and 15 Clients running without such problems. Those clients
  stay at least via ssh reachable.

  Please Help ,-)

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