I found this report searching for "synchronized to 91.189.94.4, stratum 2" on google.
My laptop totally froze a few minutes after this entry on the syslog, CPU went high and Fans went crazy. It only happened to me twice, both times last week, exactly when I booted Windows XP. ntpd has pulled the system clock back by -7201 seconds (the two hours between me and UTC). So, maybe these questions help understand the issue: Did you boot another OS before it happened, like me? Is your time zone is ahead of London, like mine? Are you able to reproduce this crash again? -- Sudden reboot happens randomly https://bugs.launchpad.net/bugs/572162 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs