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[Jonathan Reed <jdreed@xxxxxxx>]

After more research, this turns out to be a bizarre interaction of
various things.  The culprit is the intersection of this version of
compiz and running older kernel versions.   As soon as we updated to
linux-image-3.13.0-49-generic, the problem went away.  So I think it's
still the case that something in the latest compiz update, at least on
that one specific radeon card, is tickling a bug that was present at
least as recently as 3.13.0-44, but went away some time between then and
the current version.  (I do see some radeon-specific notes in the
changelog for the package, for the -45, -46, and -47 releases).

(For unrelated reasons, a site-specific script to prune old kernel
versions had the side effect, in Trusty, of removing linux-image-
generic, due to changed dependencies between trusty and precise.  As a
result, machines didn't take kernel updates in a timely manner, which is
why this bug got noticed, and the failure mode did coincide with the
machines taking the latest compiz.)

So feel free to close this, unless there's any further info you want.

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https://bugs.launchpad.net/bugs/1449089

Title:
  Regression: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1 segfaults on
  Radeon HD 7470/8470

Status in compiz package in Ubuntu:
  Confirmed

Bug description:
  After taking the 20150313 update of Compiz, compiz segfaults on Dell
  Optiplex 7010 workstations with a Radeon HD 7470/8470 graphics card.
  I'm going to get try and get more debugging information, but there was
  not a stack trace in the kernel.log, only a single segfault mention in
  /var/log/syslog.

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