[Bug 1199778] Re: upstart crashes if re-exec'ed with active chroot sessions

[James Hunt]

This problem affects those systems hosting chroots but also affects
those with sbuild/pbuilder installed. The failure process is as follows:

- user builds a package in the sbuild/pbuilder env.
- upstart gets updated within the sbuild/pbuilder chroot as part of the package build.
- as part of the upgrade, the Upstart maintainer script gets called which calls "initctl version" crucially *before* ischroot gets
  called.
- at this stage an upstart session now exists for the chroot on the host system.
- the version of upstart gets upgraded on the host system (*)
- the upgrade triggers a stateful re-exec.
- seemingly on deserialisation, if sessions exist in the meta-data, a crash results.

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https://bugs.launchpad.net/bugs/1199778

Title:
  upstart crashes if re-exec'ed with active chroot sessions

Status in Upstart:
  New
Status in “upstart” package in Ubuntu:
  New

Bug description:
  Problem affects both 1.9 and 1.9.1.

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