sparc64/82569: USB mass storage plug/unplug causes system panic

[Andy Jema]

>Number:         82569
>Category:       sparc64
>Synopsis:       USB mass storage plug/unplug causes system panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-sparc64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jun 23 11:10:19 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Andy Jema
>Release:        6.0-CURRENT
>Organization:
OT
>Environment:
FreeBSD 6.0-20050601-SNAP #0: Thu Jun  2 05:29:17 UTC 2005
root at u60.samsco.home:/usr/obj/usr/src/sys/GENERIC 
>Description:
Just installed FreeBSD 6.0-20050601-SNAP. I repeatously pluged and unpluged a USB mass storage(DVD-ROM) on my Blade 150 and as result got a kernel panic

blade150# kldload usb.ko 
ohci0: <Sun PCIO-2 USB controller> mem 0x2000000-0x2007fff at device 12.3 on pci0
ohci0: [GIANT-LOCKED]
usb0: OHCI version 1.0, legacy support
usb0: <Sun PCIO-2 USB controller> on ohci0
usb0: USB revision 1.0
uhub0: (0x108e) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
blade150# kldload umass.ko 
blade150# (null): at uhub0 port 4 (addr 2) disconnected

blade150# 
blade150# umass0: USB2.0 TO IDE USB Storage Adapter, rev 2.00/11.01, addr 2
umass0: at uhub0 port 4 (addr 2) disconnected
panic: trap: memory address not aligned
cpuid = 0
KDB: enter: panic
[thread pid 16 tid 100019 ]
Stopped at      kdb_enter+0x3c: ta              %xcc, 1
db> 

>How-To-Repeat:
plug/unplug repeatously a USB CD/DVD-ROM
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: