Correction - 4.4.0-116-generic does not solve the problem.
The server was up for over an hour before hanging. As it doesn't usually
have a console, I can't be certain of the cause of the hang. However, a
subsequent reboot, with a console, involving rebuilding a 10TB RAID 5
array, showed exactly the same Watchdog Hard Lockup for each core during
the boot process.
Now running with noibpb again.
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Hard lockup during boot with linux-image-4.4.0-112-generic
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