Re: INFO: task jbd2/dm-0-8:3993 blocked for more than 120 seconds

From: Thomas Backlund
Date: Wed Aug 17 2011 - 17:09:10 EST

Andreas Dilger skrev 17.8.2011 17:35:
On 2011-08-17, at 7:31 AM, Thomas Backlund<tmb@xxxxxxxxxx> wrote:

One of our buildnodes, a 8-core Supermicro X7DA8 system,
and a WDC WD1002FAEX-0 sata disk hits the "blocked for more than 120 seconds" several times, and ends up resetting the ata bus.

The disk does not report any errors with smart, and we have the same model in a 24-core Supermicro X8DTN, and it does not show this problem.

ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata3.00: failed command: FLUSH CACHE EXT
ata3.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
res 40/00:00:01:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
ata3.00: status: { DRDY }
ata3: soft resetting link
ata3.00: configured for UDMA/133
ata3.00: retrying FLUSH 0xea Emask 0x4
ata3: EH complete

This is a problem with your disk hardware.


Are you sure?
I get nothing from smart, even after I had executed the long test...

# smartctl -a /dev/sda
smartctl 5.39.1 2010-01-28 r3054 [x86_64-mandriva-linux-gnu] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Device Model: WDC WD1002FAEX-00Z3A0
Serial Number: WD-WCATR3168879
Firmware Version: 05.01D05
User Capacity: 1,000,204,886,016 bytes
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Wed Aug 17 23:07:52 2011 CEST
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: (0x85) Offline data collection activity
was aborted by an interrupting command from host.
Auto Offline Data Collection: Enabled.
Self-test execution status: ( 241) Self-test routine in progress...
10% of test remaining.
Total time to complete Offline
data collection: (17400) 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: ( 201) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x3037) SCT Status 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 0x002f 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 186 174 021 Pre-fail Always - 3683
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 15
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 091 091 000 Old_age Always - 7113
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 13
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 11
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 3
194 Temperature_Celsius 0x0022 115 108 000 Old_age Always - 32
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age 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 Short offline Completed without error 00% 7109 -
# 2 Extended offline Completed without error 00% 7003 -
# 3 Extended offline Completed without error 00% 6837 -
# 4 Extended offline Completed without error 00% 6670 -
# 5 Extended offline Completed without error 00% 6504 -
# 6 Extended offline Completed without error 00% 6338 -
# 7 Extended offline Completed without error 00% 6173 -
# 8 Extended offline Completed without error 00% 6006 -
# 9 Extended offline Completed without error 00% 5840 -
#10 Extended offline Completed without error 00% 5674 -
#11 Extended offline Completed without error 00% 5507 -
#12 Extended offline Completed without error 00% 5340 -
#13 Extended offline Completed without error 00% 5173 -
#14 Extended offline Completed without error 00% 5007 -
#15 Extended offline Completed without error 00% 4841 -
#16 Extended offline Completed without error 00% 4675 -
#17 Extended offline Completed without error 00% 4510 -
#18 Extended offline Completed without error 00% 4344 -
#19 Extended offline Completed without error 00% 4179 -
#20 Extended offline Completed without error 00% 4012 -
#21 Extended offline Completed without error 00% 3847 -

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.

--
Thomas
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