(ccing linux-usb)
Rogério Brito wrote:
Hi there.
I have an amd64 system running Debian's sid distribution and I installed
Linux 2.6.30-rc2 on it, as a way to get improvements for the i915
subsystem.
Unfortunately, when I was transferring the contents of 2 DVDs from the
main IDE HD to a USB external HD, I got errors from the USB host, the
writes on the external HD become failures and the ext3 filesystem there
enters into error mode, going read-only.
I eventually lose the access to the device (i.e., the /dev/sd??? device
isn't there anymore) and I then have to re-run fsck on the given
filesystem.
This has already happened 2 or 3 times already and I observed that it
only occurs when there is high traffic---if I am, say, compiling the
kernel on that external HD, I don't see any problems.
Attached is part of the dmesg log that shows the problem. I put the
whole dmesg at <http://rb.doesntexist.org/linux/>.
As always, if any further information is needed, please let me know.
You're seeing these:
[103051.265045] ehci_hcd 0000:00:1d.7: detected XactErr len 1536/4096
retry 1
[103051.265156] ehci_hcd 0000:00:1d.7: detected XactErr len 1536/4096
retry 2
[103051.265281] ehci_hcd 0000:00:1d.7: detected XactErr len 1536/4096
retry 3
[103051.265406] ehci_hcd 0000:00:1d.7: detected XactErr len 1536/4096
retry 4
According to the EHCI spec, XactErr is "Set to a one by the Host
Controller during status update in the case where the host did not
receive a valid response from the device (Timeout, CRC, Bad PID, etc.)"
Quite likely this is some kind of hardware problem - maybe the USB port
doesn't quite provide enough power for the drive, etc. A lot of these
USB enclosure devices are also rather poor quality in general..
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