kern/73307: Kernel panics on USB disconnect

[Yuri Victorovich]

>Number:         73307
>Category:       kern
>Synopsis:       Kernel panics on USB disconnect
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Oct 30 09:00:46 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Yuri Victorovich
>Release:        5.3RC1 amd64
>Organization:
>Environment:
same as ISO image of 5.3RC1 amd64
>Description:
When I disconnect Sony-F828 camera's USB interface I get panic:
----
umass0: CBI reset failed, STALLED
umass0: CBI bulk-in stall clear failed, STALLED
umass0: CBI bulk-out stall clear failed, STALLED

Fatal trap 18: integer divide fault while in kernel mode
cpuid - 0; apic id = 00
instruction pointer        = 0x8:0xffffffff08159205
stack pointer              = 0x10:0xffffffffa53895f0
code segment               = base 0x0, limit 0xfffff, type 0x1b
                           = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags           = interrupt enabled, resume, IOPL = 0
current process            = 44 (swi3: cambio)
trap number                = 18
panic: integer divide fault
cpuid = 0
Uptime: 6m4s
----
USB driver umass0 probably would have problem with this camera
(has problem with stall on FreeBSD 4.2 i386).
USB device was not fully enabled, only first line:
umass0: .. 
was printed, then if to wait it would have printed that connection stalled.
Panic occured between these two messages.
This was the second or third time I disconnected camera when panic
occured. The first time(s) was no panic.
>How-To-Repeat:
see above
>Fix:
 N/A
>Release-Note:
>Audit-Trail:
>Unformatted: