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[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

** Package changed: libxdmcp (Ubuntu) => xorg-server (Ubuntu)

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https://bugs.launchpad.net/bugs/1437507

Title:
  crash when using xdmcp to login to a remote PC

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  I think this may be raised against the correct package.

  I am having a crash when using xdmcp with lightdm when trying to log
  in to a remote PC over my network.

  After running this command on a virtual terminal ...

  X -query omega.mcs-home.com :4

  i am getting this stack trace.

  Initializing built-in extension DRI2
  Loading extension GLX
  (EE) Fatal server error:
  (EE) BUG: triggered 'if (f[f_idx])'
  (EE) BUG: ../../os/log.c:467 in pnprintf(
  (EE) Unsupported printf directive '*'
  (EE)
  (EE) Backtrace: 
  (EE) 0: X (xorg_backtrace+0x48) [0x7f569b0e8848]
  (EE) 1: X (LogVMessageVerbSigSafe+0x87d) [0x7f569b0f480d]
  (EE) 2: X (FatalError+0xd5) [0x7f569b0f4ad5]
  (EE) 3: X (0x7f569af3f000+0x1b7c24) [0x7f569b0f6c24]
  (EE) 4: X (0x7f569af3f000+0x1b80bd) [0x7f569b0f70bd]
  (EE) 5: X (WakeupHandler+0x6d) [0x7f569af9988d]
  (EE) 6: X (WaitForSomething+0x1bf) [0x7f569b0e5d9f
  (EE) 7: X (0x7f569af3f000+0x55c61) [0x7f569af94c61]
  (EE) 8: X (0x7f569af3f000+0x59d9a) [0x7f569af98d9a]
  (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f5698a7cec5]
  (EE) 10: X (0x7f569af3f000+0x451ee) [0x7f569af841ee]
  (EE)  XDMCP fatal error: Session failed %*.*s
  (EE)  Please consult the The X.Org Foundation support at http://wiki.x.org
  (EE) Please also check the log file at "/var/log/Xorg.4.log" for additional information.
  (EE) Server terminated with error (1). Closing log file.

  This has started happening after the most recent updates that i
  installed on 25/03/2015.

  If there is any more information you need, i can supply it for you.

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