h1fw1 froze up last night at 22:41 PDT with a kernel panic. It was restarted at 10:16 PDT today (I pressed the front panel reset button)
last part of the console error message was:
VFS: Close: file count is 0
Kernel panic - not syncing: CRED: put_cred_rcu() sees xxxxxxxxxxxxxx with usage -1
where xxxxxx is a large hex number.