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kern/46617: lockup on usb mouse attach

>Number:         46617
>Category:       kern
>Synopsis:       lockup on usb mouse attach
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 20 07:25:00 +0000 2012
>Originator:     Martin Husemann
>Release:        NetBSD 6.99.7
The NetBSD Foundation, Inc.
System: NetBSD 6.99.7 NetBSD 6.99.7 
(MODULAR) #189: Mon Jun 18 11:01:49 CEST 2012
Architecture: sparc64
Machine: sparc64

Since the usbmp merge I often (but not always) get a full system lockup when
attaching a usb mouse after boot. I can't get into ddb, machine seems to be
completely locked up.

I can reproduce it like 70% of the tries, especially when plugging in a mouse
and keyboard simultaneously.


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