/var/log/messages contains lots of Test Unit Ready commands

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Environment

SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP2)
SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)

Situation

The system log (/var/log/messages) contains lots of messages similar to the following:

Aug 9 12:44:06 linux kernel: [2365688.544882] sd 1:0:0:5: [sdf] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
Aug 9 12:44:06 linux kernel: [2365688.544901] sd 1:0:0:5: [sdf] tag#0 CDB: Test Unit Ready 00 00 00 00 00 00
Aug 9 12:44:06 linux kernel: [2365688.545247] sd 2:0:0:4: [sdm] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
Aug 9 12:44:06 linux kernel: [2365688.545250] sd 2:0:0:4: [sdm] tag#0 CDB: Test Unit Ready 00 00 00 00 00 00
Aug 9 12:44:08 linux kernel: [2365690.545690] sd 1:0:0:6: [sdg] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
Aug 9 12:44:08 linux kernel: [2365690.545709] sd 1:0:0:6: [sdg] tag#0 CDB: Test Unit Ready 00 00 00 00 00 00

Resolution

This issue has been addressed with kernel 4.4.120-92.70.1 for SLES 12 SP2 and 4.4.120-94.17.1 for SLES 12 SP3.

Cause

Test Unit Ready commands were incorrectly reported.

Additional Information

Kernel change log entry:

- scsi: do not print 'reservation conflict' for TEST UNIT READY
(bsc#1027054).
- commit f106680

Disclaimer

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