On Sun, 21 Aug 2005 16:57:14 -0400 (EDT)
Alan Stern wrote:

> It appears that khubd is stuck in ehci_disable_endpoint, which points to a 
> bug in the EHCI driver.  If you get multiple stack traces, with varying 
> time intervals in between, does the khubd entry always end up looking like 
> this one?
> 
> What this means is that the hub driver has detected that your drive 
> disconnected and is trying to clean up after it.  During that clean-up 
> period it locks the device -- that's what prevents usbview and lsusb from 
> doing their thing.  I can't tell what's going on with the badblocks 
> program, but maybe once this issue is solved the program will fail 
> gracefully rather than hang.
> 
> If you're more interested in preventing this sort of thing, I still 
> suggest you try a 2.6.13-mm kernel.  If nothing else, it would help me to 
> know whether the error recovery in there works adequately.
> 
> Alan Stern


Hi Alan,

I have downloaded 2.6.13-rc6 and built it.  I've not yet tried running
it as I figured preserving the current b0rked state might provide
additional info for you.

It sounds like there are 3 paths now:
  1 - continue with 2.6.12
  2 - use 2.6.13-rc6
  3 - switch to 2.6.13-mm

Which would be more valuable to you? 

Using badblocks was of value since one goal was to distinguish between
driver and file system (ReiserFS) problems.  I can restart my machine
and run badblocks and get multiple khubd stack traces.  Is there any
particular pattern for getting them that would be must useful?

Regards,

David


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