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[AG <1536605@xxxxxxxxxxxxxxxxxx>]

Please note: The problem does NOT only apply to nvidia drivers, it might
not even be related to a graphics driver at all!.

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https://bugs.launchpad.net/bugs/1536605

Title:
  Machine freezes locally, Xorg EQ overflow

Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  New

Bug description:
  We observe spontaneous and not (yet) reproducible freezes on many of
  our heterogeneous PCs. A machine freezes such that it cannot be
  accessed locally anymore (keyboard dead, screen black or with last
  image, sometimes mouse can be moved but no action on clicks) but we
  have full access via ssh. There are no heavy processes or such
  running. Freeze happens sometime during usage but also during screen-
  lock without background activity.

  We have observed the problem
   * on Ubuntu 12.04 and 14.04, 
   * on PCs running a multitude of graphics adapters (nvidia, ati, intel) 
   * on PCs running different versions of e.g. the nvidia driver

  The only log file with some information related to this is
  /var/log/Xorg.0.log where we find

  ==>>===================================================================
  (EE) [mi] EQ overflowing.  Additional events will be discarded until existing
  events are processed.
  (EE)
  (EE) Backtrace:
  (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7f1bd1327848]
  (EE) 1: /usr/bin/X (mieqEnqueue+0x22b) [0x7f1bd130983b]
  (EE) 2: /usr/bin/X (QueuePointerEvents+0x52) [0x7f1bd11eaf72]
  (EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f1bc8621000+0x57fd)
  [0x7f1bc86267fd]
  (EE) 4: /usr/bin/X (0x7f1bd117e000+0x93518) [0x7f1bd1211518]
  (EE) 5: /usr/bin/X (0x7f1bd117e000+0xbbc90) [0x7f1bd1239c90]
  (EE) 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f1bd027a000+0x10340)
  [0x7f1bd028a340]
  (EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (__poll+0x10) [0x7f1bced86110]
  (EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (0x7f1bcec99000+0x1284a0) [0x7f1bcedc14a0]
  (EE) 9: /lib/x86_64-linux-gnu/libnsl.so.1 (0x7f1bc7ff7000+0x515f) [0x7f1bc7ffc15f]
  (EE) 10: /lib/x86_64-linux-gnu/libnsl.so.1 (yp_match+0xb2) [0x7f1bc7ffc6a2]
  (EE) 11: /lib/x86_64-linux-gnu/libnss_nis.so.2 (_nss_nis_getpwnam_r+0x68)
  [0x7f1bc7df0a98]
  (EE) 12: /lib/x86_64-linux-gnu/libnss_compat.so.2 (0x7f1bc8211000+0x156c)
  [0x7f1bc821256c]
  (EE) 13: /lib/x86_64-linux-gnu/libnss_compat.so.2 (_nss_compat_getpwnam_r+0x3f7)
  [0x7f1bc8215617]
  (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (getpwnam_r+0xdd) [0x7f1bced5906d]
  (EE) 15: /lib/x86_64-linux-gnu/libc.so.6 (getpwnam+0x7f) [0x7f1bced589ff]
  (EE) 16: /usr/bin/X (0x7f1bd117e000+0x1a7ae5) [0x7f1bd1325ae5]
  (EE) 17: /usr/bin/X (0x7f1bd117e000+0x1a8ac7) [0x7f1bd1326ac7]
  (EE) 18: /usr/bin/X (InvalidHost+0x170) [0x7f1bd1327180]
  (EE) 19: /usr/bin/X (ClientAuthorized+0x125) [0x7f1bd1328905]
  (EE) 20: /usr/bin/X (0x7f1bd117e000+0x559ac) [0x7f1bd11d39ac]
  (EE) 21: /usr/bin/X (0x7f1bd117e000+0x55f0e) [0x7f1bd11d3f0e]
  (EE) 22: /usr/bin/X (0x7f1bd117e000+0x59d9a) [0x7f1bd11d7d9a]
  (EE) 23: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f1bcecbaec5]
  (EE) 24: /usr/bin/X (0x7f1bd117e000+0x451ee) [0x7f1bd11c31ee]
  (EE)
  (EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the
  stack.
  (EE) [mi] mieq is *NOT* the cause.  It is a victim.
  (EE) [mi] EQ overflow continuing.  100 events have been dropped.
  ==>>===================================================================

  
  That then counts in steps of 100 up to 1000 and then the machine is frozen locally. Different to other bug reports on similar issues, it appears here that libnss_nis.so.2 and libnss_compat.so.2 are involved (user login is via yp).

  Any workaround would be appreciated. I'm happy to provide more details
  if required.

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