Well, yes I agree, it does look like the serial port causing the
softlockup is probably separate - but caused by - the nbd closed socket
errors.  However, the serial port output definitely shouldn't be causing
a softlockup - no matter how much data it has to send, the serial port
driver in the kernel should be scheduling itself during operation, so
that it doesn't hog a single cpu for a long time.  It's more likely that
the general system "freezing" you are seeing is due to the serial port
driver refusing to schedule off its cpu, and not any problem with the
nbdX failure.

I'll look into the nbd code also though, to see where that error is
coming from and what that problem may be.

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  Soft lockup with "block nbdX: Attempted send on closed socket" spam

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