arm/162159: [panic] USB errors leading to panic on DockStar 9.0-RC1/arm

[Mark Tinguely]

The following reply was made to PR arm/162159; it has been noted by GNATS.

From: Mark Tinguely <marktinguely at gmail.com>
To: bug-followup at FreeBSD.org, crest at tzi.de
Cc:  
Subject: Re: arm/162159: [panic] USB errors leading to panic on DockStar 9.0-RC1/arm
Date: Thu, 8 Mar 2012 08:16:39 -0600

 I am seeing something like this on a different ARM platform, but the
 USB code may be a cousin to the mv code.
 
 Do you still have this setup? Could you take to ethernet card out of
 the kernel - removing the ethernet helps in my case. Could a problem
 be tickled by interrupt handling?
 
 I did the following test:
 
 $ dd if=/dev/zero of=r0 bs=4096 count=16k
 
 $ od r0
 0000000    000000  000000  000000  000000  000000  000000  000000  000000
 *
 400000000
 
 $ cp r0 r1 ; cp r1 r2 ; cp r2 r3 ; cp r3 r4 ; cp r4 r5 ; cp r5 r6; diff r0 r6
 
 Many time there is a corruption at about r2 or r3. If I take the
 ethernet card out of the kernel, the problem happens less often.
 
 I use zero because it is easy to see where things go wrong.
 
 If they are different, start doing "od" on the copied files see if you
 see 0x377 in the first corrupted file.
 
 --Mark.