Incorrect time of self-test

[Kovalkov Dmittrii]

Hello!!!

Info:

root@1923 ~ # /opt/nobody/smartmontools-7.1/sbin/smartctl -a /dev/sda
smartctl 7.1 2019-05-21 r4918 [x86_64-linux-2.6.32-5-amd64] (local build)
Copyright (C) 2002-19, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     SAMSUNG SpinPoint F1 DT
Device Model:     SAMSUNG HD753LJ
Serial Number:    S13UJ1MSB03195
LU WWN Device Id: 5 0024e9 0028a805c
Firmware Version: 1AA01118
User Capacity:    750,156,374,016 bytes [750 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA/ATAPI-7, ATA8-ACS T13/1699-D revision 3b
Local Time is:    Tue May 28 12:48:10 2019 MSK
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00)	Offline data collection activity
					was never started.
					Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		( 9669) seconds.
Offline data collection
capabilities: 			 (0x7b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					Conveyance Self-test supported.
					Selective Self-test supported.
SMART capabilities:            (0x0003)	Saves SMART data before entering
					power-saving mode.
					Supports SMART auto save timer.
Error logging capability:        (0x01)	Error logging supported.
					General Purpose Logging supported.
Short self-test routine 
recommended polling time: 	 (   2) minutes.
Extended self-test routine
recommended polling time: 	 ( 162) minutes.
Conveyance self-test routine
recommended polling time: 	 (  18) minutes.
SCT capabilities: 	       (0x003f)	SCT Status supported.
					SCT Error Recovery Control supported.
					SCT Feature Control supported.
					SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   100   099   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0007   082   082   011    Pre-fail  Always       -       6210
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       9
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000f   100   100   051    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0025   100   100   015    Pre-fail  Offline      -       12400
  9 Power_On_Hours          0x0032   085   085   000    Old_age   Always       -       76614
 10 Spin_Retry_Count        0x0033   100   100   051    Pre-fail  Always       -       0
 11 Calibration_Retry_Count 0x0012   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       9
 13 Read_Soft_Error_Rate    0x000e   100   099   000    Old_age   Always       -       0
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0
184 End-to-End_Error        0x0033   100   100   000    Pre-fail  Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       66
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0022   065   063   000    Old_age   Always       -       35 (Min/Max 20/37)
194 Temperature_Celsius     0x0022   064   061   000    Old_age   Always       -       36 (Min/Max 20/42)
195 Hardware_ECC_Recovered  0x001a   100   100   000    Old_age   Always       -       849825416
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x003e   100   100   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x000a   100   100   000    Old_age   Always       -       0
201 Soft_Read_Error_Rate    0x000a   100   100   000    Old_age   Always       -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     11077         -
# 2  Extended offline    Completed without error       00%     18418         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

root@1923 ~ # 

Recent short self-test has 11077 value, but Power_On_hours 76614

I think, that 11077 = Power_On_hours - (65536 + 1) and it`s overflow in self-test lifetime

Please, help us

[Kovalkov Dmittrii]

https://www.smartmontools.org/ticket/12

Note: this time stamp wraps after 2^{16 hours, or 2730 days and 16 hours, or about 7.5 years.}