[Bug 1447756] Re: segfault in log.c code causes phone reboot loops

[James Hunt]

Applying the top 2 commits (r1665 and r1666) from
lp:~jamesodhunt/upstart/bug-1447756-the-actual-fix [1] to
https://bugs.launchpad.net/ubuntu-
rtm/+source/upstart/1.13.2-0ubuntu1rtm1 is now working for me.

I've tested this by building on the device itself and also by building
in a ARCH=armhf utopic chroot [2].

__________

[1] - Equivalent to the attached patch.
[2] - Interestingly, building in an vivid ARCH=armhf chroot generates a binary that fails at runtime.

** Patch added: "bug-1447756-both-fixes.diff"
   https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/1447756/+attachment/4396882/+files/bug-1447756-both-fixes.diff

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https://bugs.launchpad.net/bugs/1447756

Title:
  segfault in log.c code causes phone reboot loops

Status in the base for Ubuntu mobile products:
  In Progress
Status in Upstart:
  In Progress
Status in upstart package in Ubuntu:
  In Progress

Bug description:
  We recently started getting reprots from phone users that their
  devices go into a reboot loop after changing the language or getting
  an OTA upgrade (either of both end with a reboot of the phone)

  after a bit of research we collected the log at
  http://pastebin.ubuntu.com/10872934/

  this shows a segfault of upstarts init binary in the log.c code:

  [    6.999083]init: log.c:819: Assertion failed in log_clear_unflushed: log->unflushed->len
  [    7.000279]init: Caught abort, core dumped
  [    7.467176]Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000600

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