Short S.M.A.R.T test completes successfully with gnome-disk, but smartctl reports a read failure

Question

I acquired an used 1Tb Western Digital hard drive and I want to check its health status under Linux Mint 18.2.

I checked its S.M.A.R.T health status and everything is reported as OK. gnome-disk reports only one bad sector.

I ran a short test with gnome-disk and it completed successfully.

I also tried to run a short test with smartctl with the smartctl /dev/sdc -t short command, and it reports a read failure (reads the command output bellow):

smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.8.0-53-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
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%      8065         -
# 2  Conveyance captive  Interrupted (host reset)      90%      8065         -
# 3  Extended offline    Aborted by host               90%      8065         -
# 4  Short offline       Completed without error       00%      8064         -
# 5  Extended offline    Completed: read failure       90%      8064         125259637
# 6  Extended offline    Aborted by host               90%      8064         -
# 7  Short offline       Completed without error       00%      8064         -

Then I tried to run an extended test with gnome-disk, and this time it didn't complete successfully, it failed at 90%.

So I ran an extended test using smartctl using the sudo smartctl /dev/sdc -t long -C command, and here is the selftest log:

smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.8.0-53-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended captive    Interrupted (host reset)      90%      8065         -
# 2  Conveyance captive  Interrupted (host reset)      90%      8065         -
# 3  Extended captive    Interrupted (host reset)      90%      8065         -
# 4  Extended captive    Interrupted (host reset)      90%      8065         -
# 5  Extended captive    Interrupted (host reset)      90%      8065         -
# 6  Extended captive    Interrupted (host reset)      90%      8065         -
# 7  Extended offline    Aborted by host               90%      8065         -
# 8  Short offline       Completed without error       00%      8065         -
# 9  Short offline       Completed without error       00%      8065         -
#10  Conveyance captive  Interrupted (host reset)      90%      8065         -
#11  Extended offline    Aborted by host               90%      8065         -
#12  Short offline       Completed without error       00%      8064         -
#13  Extended offline    Completed: read failure       90%      8064         125259637
#14  Extended offline    Aborted by host               90%      8064         -
#15  Short offline       Completed without error       00%      8064         -

Is the hard drive still reliable? Is this failure benign? How should I read smartctl logs in future cases?