I'm not sure whether it gives any information, but here is some output
from journalctl, where the bug happens (no "clocksource=jiffies" boot
option is used):

$ journalctl -k | grep clocksource

clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, 
max_idle_ns: 7645519600211568 ns
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 
7645041785100000 ns
clocksource: Switched to clocksource refined-jiffies
clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2879c5f06f2, 
max_idle_ns: 440795220049 ns
clocksource: Switched to clocksource tsc
clocksource: timekeeping watchdog on CPU0: Marking clocksource 'tsc' as 
unstable because the skew is too large:
clocksource:                       'refined-jiffies' wd_now: fffedcd0 wd_last: 
fffedc58 mask: ffffffff
clocksource:                       'tsc' cs_now: 13ccf176fe cs_last: 13299ba17d 
mask: ffffffffffffffff
kernel: tsc: Marking TSC unstable due to clocksource watchdog
kernel: clocksource: Switched to clocksource refined-jiffies

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https://bugs.launchpad.net/bugs/124406

Title:
  Keyboard keys get stuck and repeat

Status in GNU Emacs:
  Invalid
Status in Linux:
  Confirmed
Status in X.Org X server:
  In Progress
Status in linux package in Ubuntu:
  Won't Fix
Status in xorg-server package in Ubuntu:
  Won't Fix
Status in linux source package in Jaunty:
  Won't Fix
Status in xorg-server source package in Jaunty:
  Invalid
Status in Gentoo Linux:
  New

Bug description:
  Keyboard keys such as the arrows, Alt-F4, PageUp/PageDown, etc. often
  get 'stuck' and continue being 'clicked' even after they are
  physically released. For example when clicking Alt-F4, sometimes it
  gets stuck so all the windows are closed instead of just one.

  My configuration is Feisty + Xgl + Compiz Fusion. My previous
  configuration was Edgy + Xgl + Beryl, where this didn't happen. Others
  have reported the same problem without using either Xgl or Compiz.

  The keyboard itself isn't the problem. When dual-booting to Windows,
  everything works fine. Also, the problem happens with two different
  keyboards (internal laptop, external USB).

  My best guess is that the problem occurs at time of high system load.
  Somehow during these times the key-release signal gets lost and the
  key-press is repeated indefinitely. This happens more often with
  Compiz configurations because Compiz tends to increase system load. It
  also happens more often with power-hungry apps like Firefox and
  Acrobat Reader for similar reasons.

  PS: When the keys would repeat all input devices would be locked up.
  ie. mouse won't move, clicks don't do anything, keyboard presses don't
  register. Then when it becomes unstuck, the mouse moves around and
  everything. Hope this helps.

  See also this forum thread for other people with the same problem:
  http://ubuntuforums.org/showthread.php?t=432057

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