Comment 5 for bug 1349711

The crashes became more frequent. The approximate time was >12 days running, then ~2 days running, then 6 hours, then 1 hour.

I since moved to 3.15.7-031507-generic.

One thing I have observed is that (EXT4 filesystem) /var/log/nginx/access.log contained ~2KB of NULL characters in place of any entries at the point when the machine froze.