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kern/49328: ixg interface fails with enabled LOCKDEBUG

>Number:         49328
>Category:       kern
>Synopsis:       ixg interface fails with enabled LOCKDEBUG
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 27 20:15:00 +0000 2014
>Originator:     Uwe Toenjes
>Release:        NetBSD 7.0_BETA
University of Leipzig
NetBSD 7.0_BETA NetBSD 7.0_BETA (MYCONF7) #1: Tue Oct 21 22:07:17 CEST 2014 amd64
If the kernel is compiled with debug code, the kernel crashes if an ixg interface comes up. The kernel reports:

panic: LOCKDEBUG: Mutex error: lockdebug_barrier: spin lock held

I screenshot can be found at:
Compile the kernel with debug code and bring up an ixg interface

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