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0e1f616
(Get the code!)
Same symptoms here.
In our case, five 22.04LTS servers with the 5.15.0-60-generic kernel running a web service, all five with an NFS-mounted volume.
After updating some of them with the 5.15.0-67-generic kernel, the traffic on the interface with which the NFS server is accessed increases for no apparent reason. Both output and input packets per second go from about 2k/s to a continuous 12k/s. The context switch rate per second increases by the same ratio. As a result, operations against the NFS volume are slowed down and the user experience is noticeably worse. In the meantime, systems running 5.15.0-60-generic are working as usual.
As in the case of the reporter, booting the systems with 5.15.0-60-generic returns us to the original state.