Comment 36 for bug 406397

According to Mark Hurenkamp's comment, severity of this bug should be set to Critical.
Image your very important app got the same PID as non-existent process had.
Then Upstart:
- causes data corruption - imagine you are editing your photos and something kills your application during rewrite of a photo
- severely affects applications beyond the package responsible for the root cause - any application can be killed ("crashing") randomly