Package: linux-image-3.16.0-0.bpo.4-amd64
Version: 3.16.7-ckt2-1~bpo70+1
Severity: important

Dear Maintainer,

   * What led up to the situation?

   One of my RAID1 arrays sporadically degrades during the checkarray cron job:

   Jan  4 00:57:01 nihlus /USR/SBIN/CRON[4367]: (root) CMD (if [ -x 
/usr/share/mdadm/checkarray ] && [ $(date +%d) -le 7 ]; then 
/usr/share/mdadm/checkarray --cron --all --idle --quiet; fi)
   Jan  4 00:57:01 nihlus kernel: [ 3932.435274] md: data-check of RAID array 
md0
   Jan  4 00:57:01 nihlus kernel: [ 3932.455356] md: minimum _guaranteed_  
speed: 1000 KB/sec/disk.
   Jan  4 00:57:01 nihlus kernel: [ 3932.469160] md: delaying data-check of md2 
until md0 has finished (they share one or more physical units)
   Jan  4 00:57:01 nihlus kernel: [ 3932.524839] md: using maximum available 
idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
   Jan  4 00:57:01 nihlus kernel: [ 3932.569568] md: using 128k window, over a 
total of 262132k.
   Jan  4 00:57:03 nihlus kernel: [ 3934.473794] md: md0: data-check done.
   Jan  4 00:57:03 nihlus kernel: [ 3934.491622] md: data-check of RAID array 
md2
   Jan  4 00:57:03 nihlus kernel: [ 3934.510850] md: minimum _guaranteed_  
speed: 1000 KB/sec/disk.
   Jan  4 00:57:03 nihlus mdadm[2289]: RebuildFinished event detected on md 
device /dev/md/0
   Jan  4 00:57:03 nihlus kernel: [ 3934.541334] md: using maximum available 
idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
   Jan  4 00:57:03 nihlus kernel: [ 3934.587243] md: using 128k window, over a 
total of 1952201680k.
   [...]
   Jan  4 03:35:35 nihlus kernel: [13446.203438] sd 1:0:0:0: [sdb] Unhandled 
error code
   Jan  4 03:35:35 nihlus kernel: [13446.225179] sd 1:0:0:0: [sdb]
   Jan  4 03:35:35 nihlus kernel: [13446.239316] Result: hostbyte=DID_OK 
driverbyte=DRIVER_TIMEOUT
   Jan  4 03:35:35 nihlus kernel: [13446.265222] sd 1:0:0:0: [sdb] CDB:
   Jan  4 03:35:36 nihlus kernel: [13446.280916] Write(10): 2a 00 00 d8 67 08 
00 00 20 00
   Jan  4 03:35:36 nihlus kernel: [13446.303438] end_request: I/O error, dev 
sdb, sector 14182152
   Jan  4 03:35:36 nihlus kernel: [13446.330133] md/raid1:md2: Disk failure on 
sdb3, disabling device.
   Jan  4 03:35:36 nihlus kernel: [13446.330133] md/raid1:md2: Operation 
continuing on 1 devices.
   Jan  4 03:35:36 nihlus kernel: [13446.401456] md: md2: data-check 
interrupted.
   Jan  4 03:35:36 nihlus kernel: [13446.467913] RAID1 conf printout:
   Jan  4 03:35:36 nihlus kernel: [13446.467920]  --- wd:1 rd:2
   Jan  4 03:35:36 nihlus kernel: [13446.467925]  disk 0, wo:0, o:1, dev:sda3
   Jan  4 03:35:36 nihlus kernel: [13446.467929]  disk 1, wo:1, o:0, dev:sdb3
   Jan  4 03:35:36 nihlus kernel: [13446.492871] RAID1 conf printout:
   Jan  4 03:35:36 nihlus kernel: [13446.492878]  --- wd:1 rd:2
   Jan  4 03:35:36 nihlus kernel: [13446.492883]  disk 0, wo:0, o:1, dev:sda3
   Jan  4 03:35:36 nihlus mdadm[2289]: Fail event detected on md device 
/dev/md/2
   Jan  4 03:35:36 nihlus postfix/pickup[4968]: 3kFPGJ1mCzz1n: uid=0 from=<root>
   Jan  4 03:35:36 nihlus postfix/cleanup[5060]: 3kFPGJ1mCzz1n: 
message-id=<3kfpgj1mcz...@spectre.leuxner.net>
   Jan  4 03:35:36 nihlus mdadm[2289]: FailSpare event detected on md device 
/dev/md/2, component device /dev/sdb3
   Jan  4 03:35:36 nihlus mdadm[2289]: RebuildFinished event detected on md 
device /dev/md/2

   # cat /proc/mdstat
   Personalities : [raid1]
   md2 : active raid1 sda3[0] sdb3[2](F)
        1952201680 blocks super 1.2 [2/1] [U_]

   md1 : active (auto-read-only) raid1 sda2[0] sdb2[1]
        1048564 blocks super 1.2 [2/2] [UU]

   md0 : active raid1 sda1[0] sdb1[1]
        262132 blocks super 1.2 [2/2] [UU]

   # smartctl -i /dev/sdb
   smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.16.0-0.bpo.4-amd64] (local 
build)
   Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

   === START OF INFORMATION SECTION ===
   Device Model:     TOSHIBA DT01ACA200
   Serial Number:    [redacted]
   LU WWN Device Id: 5 000039 ff3e05ac0
   Firmware Version: MX4OABB0
   User Capacity:    2,000,398,934,016 bytes [2.00 TB]
   Sector Sizes:     512 bytes logical, 4096 bytes physical
   Device is:        Not in smartctl database [for details use: -P showall]
   ATA Version is:   8
   ATA Standard is:  ATA-8-ACS revision 4
   Local Time is:    Sun Jan  4 18:50:18 2015 CET
   SMART support is: Available - device has SMART capability.
   SMART support is: Enabled

   # smartctl -l selftest /dev/sdb
   smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.16.0-0.bpo.4-amd64] (local 
build)
   Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

   === 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 offline    Completed without error       00%      1490         
-
   # 2  Extended offline    Completed without error       00%       822         
-
   # 3  Short offline       Completed without error       00%       812         
-

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

   # mdadm --manage /dev/md2 --remove /dev/sdb3
   # mdadm --manage /dev/md2 --add /dev/sdb3

   * What was the outcome of this action?
   
   The array rebuilt without _any_ errors. The drive never went offline during 
normal operation and also
   shows no errors when conducting self-tests. It only sporadically gets 
removed from the array during
   the checkarray job - when a driver timeout occurs.
  
   * What outcome did you expect instead?
  
   No drive degradation during cron job.
  
-- System Information:
Debian Release: 7.7
  APT prefers stable
  APT policy: (1001, 'stable'), (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-0.bpo.4-amd64
Locale: LANG=en_US.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash


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