Smart I/O errors when there don't seem to be

[Phillip Susi]

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My syslog is full of entries that look like this:

Mar 3 12:06:45 faldara udisksd[2630]: Error performing housekeeping
for drive
/org/freedesktop/UDisks2/drives/WDC_WD360GD_00FNA0_WD_WMAH91337618:
Error updating SMART data: sk_disk_smart_status: Input/output error
(udisks-error-quark, 0)

And opening the disks utility shows invalid smart data, and choosing
to update the smart data also reports an I/O error. Using smartctl on
the command line though says this disk is fine:

root at faldara:~# smartctl -a /dev/sdc
smartctl 5.43 2012-06-30 r3573 [x86_64-linux-3.8.0-7-generic] (local
build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family: Western Digital Raptor
Device Model: WDC WD360GD-00FNA0
Serial Number: WD-WMAH91337618
Firmware Version: 35.06K35
User Capacity: 37,019,566,080 bytes [37.0 GB]
Sector Size: 512 bytes logical/physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: 6
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Sun Mar 3 23:25:55 2013 EST
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: (0x82) Offline data collection activity
     was completed without error.
     Auto Offline Data Collection: Enabled.
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: ( 1572) 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.
     No General Purpose Logging support.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 28) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.

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 0x000b 200 200 051 Pre-fail Always - 0
  3 Spin_Up_Time 0x0007 088 084 021 Pre-fail Always - 2100
  4 Start_Stop_Count 0x0032 095 095 040 Old_age Always - 5566
  5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
  7 Seek_Error_Rate 0x000b 200 200 051 Pre-fail Always - 0
  9 Power_On_Hours 0x0032 080 080 000 Old_age Always - 14706
 10 Spin_Retry_Count 0x0013 100 100 051 Pre-fail Always - 0
 11 Calibration_Retry_Count 0x0013 100 100 051 Pre-fail Always - 0
 12 Power_Cycle_Count 0x0032 095 095 000 Old_age Always - 5255
194 Temperature_Celsius 0x0022 109 253 000 Old_age Always - 34
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0012 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0012 200 200 000 Old_age Always - 0
199 UDMA_CRC_Error_Count 0x000a 200 253 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0009 200 125 051 Pre-fail Offline - 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 Extended offline Completed without error 00% 942 -
# 2 Extended offline Completed without error 00% 232 -
# 3 Extended offline Completed without error 00% 145 -
# 4 Extended offline Completed without error 00% 62 -
# 5 Extended offline Completed without error 00% 761 -
# 6 Extended offline Completed without error 00% 562 -
# 7 Extended offline Completed without error 00% 696 -
# 8 Extended offline Completed without error 00% 192 -
# 9 Extended offline Completed without error 00% 888 -

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 at faldara:~#

Any idea what could be causing this?  This is on Ubuntu 13.04.

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