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

[Ondrej Kubik]

Sorry for spamming, but I guess that log_io_reader is called by nih_io_watcher which has been initialised by "nih_io_reopen"
which I suppose is called when job starts?

So that would go back to my original finding, job dies and is restarted before we get signal about disk being writable, but at the time job has been restarted it succeeds in writing unflushed logs to the disk while calling log_io_reader
Makes sense?

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

Status in the base for Ubuntu mobile products:
  Fix Committed
Status in Upstart:
  New
Status in upstart package in Ubuntu:
  Confirmed

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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