After running for about 24 hours I got a large number of "aacraid: Host
adapter abort request (2,0,0,0)" errors and then the following:

AAC: Host adapter BLINK LED 0x7
AAC0: adapter kernel panic'd 7.
sd 2:0:0:0: Device offlined - not ready after error recovery
sd 2:0:0:0: Device offlined - not ready after error recovery
sd 2:0:0:0: Device offlined - not ready after error recovery
sd 2:0:0:0: Device offlined - not ready after error recovery
sd 2:0:0:0: Device offlined - not ready after error recovery
sd 2:0:0:0: Device offlined - not ready after error recovery

At this point my root filesystem is read-only. It won't reboot remotely
because I've got logging turned on for sudo. So I'll need to physically
goto the system and do a hard reset.

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https://bugs.launchpad.net/bugs/1653162

Title:
  System won't boot after upgrade to 16.04 with 4.4.0 kernel

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