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bbfa235
(Get the code!)
We had the same issue after updating from Ubuntu 14.04 to 16.04 and then 18.04 (the two consecutive updates were applied on the same day).
The filesystem is also XFS. and the setup is with raid10.
The bug does not completely froze the system. Many process still run and were able to write to disk. But new processes seems to have trouble with that.
Also, some processes that did not write to disk also halted. Example: htop and ps aux
Interesting thing is that "ps aux" actually started printing the output and around the middle of the execution, it halted, and Ctrl+C was unable to exit the program.
htop, which hangs a few seconds after its execution, showed that the frozen processed were in D (uninterruptible sleep) state.
The fix was to downgrade from kernel 4.15.0-34-generic to 4.2.0-34-generic.
Although the fix was not perfect, since that fix it happened again once. (but once in 130 days is not as bad)
Attached logs: kernel.log with some stracktrace, but they are more or less the same as previously posted.. (the logs were OCR'ed from some screenshots. so beware of some characters. like the 0 which sometimes turns into a 6)