Comment 7 for bug 1810781

Verification done on Bionic, with the HWE kernel in Xenial
(i.e., 4.15.0-44.47~16.04.1 per the original reporter's environment)

The mpt3sas driver is running correctly -- the sosreport shows the previous kernel had mpt3sas fault_state error messages repeatedly within less than 10 minutes, and the current kernel has zero in ~76 minutes (~4600 seconds uptime in kern.log).

$ grep -e 'Linux version' -e 'mpt3sas.*fault_state' sosreport-<details ommited>/var/log/kern.log
...
Jan 18 04:32:36 <details ommited> kernel: [18225729.321846] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 04:41:08 <details ommited> kernel: [18226240.928889] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 04:48:47 <details ommited> kernel: [18226700.312831] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 04:57:29 <details ommited> kernel: [18227222.159601] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 05:05:46 <details ommited> kernel: [18227719.430826] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 05:12:52 <details ommited> kernel: [18228145.023317] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 05:17:22 <details ommited> kernel: [18228414.970544] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 05:22:22 <details ommited> kernel: [18228714.613254] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 05:26:57 <details ommited> kernel: [18228989.680424] mpt3sas_cm0: fault_state(0x2100)!
Jan 18 05:36:14 <details ommited> kernel: [ 0.000000] Linux version 4.15.0-44-generic (buildd@lcy01-amd64-025) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10)) #47~16.04.1-Ubuntu SMP Mon Jan 14 20:50:30 UTC 2019 (Ubuntu 4.15.0-44.47~16.04.1-generic 4.15.18)

$ tail -n1 sosreport-<details ommited>/var/log/kern.log
Jan 18 06:52:36 <details ommited> kernel: [ 4613.908291] perf: interrupt took too long (3958 > 3952), lowering kernel.perf_event_max_sample_rate to 50500