long tests automatically get interrupted

when i run long tests in debian sid, they usually get interrupted:

> 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%        77         -
> # 2  Short offline       Completed without error       00%        74         -
> # 3  Extended captive    Interrupted (host reset)      90%        73         -
> # 4  Extended captive    Interrupted (host reset)      90%         3         -
> # 5  Extended offline    Interrupted (host reset)      40%         3         -
> # 6  Conveyance offline  Completed without error       00%         0         -
> # 7  Short offline       Completed without error       00%         0         -


dmesg shows the following line near the interruption time for test #2:

> [153384.901218] usb 1-1.1: reset high-speed USB device number 6 using ehci-pci

in the one successful long test, i didn't use the "-C" option. in the
prior test, which was interrupted, i did. for the other interrupted
tests, i tested it with and without the "-C" option while using an older
kernel. (perhaps i had "ejected" the disk through the gui before
starting... i don't actually know, since it was a long time ago.)

is the kernel doing this because the drive is not fully accessible
during a test? my online search didn't reveal much, except for a forum
post i found a while back. unfortunately, i didn't save the link. :-(

if anyone knows why this is happening or how to best avoid this problem,
i can add it to the faq for you. thanks!


-andrew

p.s. please CC me in replies.


here is more of the dmesg log, for more context:

> [153143.087642] usb 1-1.1: new high-speed USB device number 5 using ehci-pci
> [153143.599687] usb 1-1.1: new high-speed USB device number 6 using ehci-pci
> [153143.692937] usb 1-1.1: New USB device found, idVendor=1058, idProduct=10a8
> [153143.692943] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [153143.692946] usb 1-1.1: Product: Elements 10A8
> [153143.692949] usb 1-1.1: Manufacturer: Western Digital
> [153143.692951] usb 1-1.1: SerialNumber: <edited>
> [153143.693345] usb-storage 1-1.1:1.0: USB Mass Storage device detected
> [153143.693632] scsi7 : usb-storage 1-1.1:1.0
> [153144.692345] scsi 7:0:0:0: Direct-Access     WD       Elements 10A8    1042 PQ: 0 ANSI: 6
> [153144.696752] sd 7:0:0:0: [sdb] Spinning up disk...
> [153145.699649] .....ready
> [153149.962446] sd 7:0:0:0: [sdb] 1953458176 512-byte logical blocks: (1.00 TB/931 GiB)
> [153149.963666] sd 7:0:0:0: [sdb] Write Protect is off
> [153149.963674] sd 7:0:0:0: [sdb] Mode Sense: 53 00 10 08
> [153149.964829] sd 7:0:0:0: [sdb] No Caching mode page found
> [153149.964837] sd 7:0:0:0: [sdb] Assuming drive cache: write through
> [153149.967766] sd 7:0:0:0: [sdb] No Caching mode page found
> [153149.967774] sd 7:0:0:0: [sdb] Assuming drive cache: write through
> [153150.016976]  sdb: sdb1 sdb2
> [153150.021154] sd 7:0:0:0: [sdb] No Caching mode page found
> [153150.021162] sd 7:0:0:0: [sdb] Assuming drive cache: write through
> [153150.021169] sd 7:0:0:0: [sdb] Attached SCSI disk
> [153384.901218] usb 1-1.1: reset high-speed USB device number 6 using ehci-pci

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