William Grant points out:
commit 8b834bff1b73dce46f4e9f5e84af6f73fed8b0ef
Date: Tue Mar 13 17:42:39 2018 +0800
scsi: hpsa: fix selection of reply queue
Since commit 84676c1f21e8 ("genirq/affinity: assign vectors to all
possible CPUs") we could end up with an MSI-X vector that did not have
any online CPUs mapped. This would lead to I/O hangs since there was no
CPU to receive the completion.
Our 4.15 does not have that commit, but does have the referenced one.
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https://bugs.launchpad.net/bugs/1766770
Title:
4.15.0-15-generic can't find root device
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