kern/49328: ixg interface fails with enabled LOCKDEBUG

[6bone%6bone.informatik.uni-leipzig.de@localhost]

>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
>Organization:
University of Leipzig
>Environment:
NetBSD gate.ipv6.uni-leipzig.de 7.0_BETA NetBSD 7.0_BETA (MYCONF7) #1: Tue Oct 21 22:07:17 CEST 2014  root%gate.ipv6.uni-leipzig.de@localhost:/usr/obj/sys/arch/amd64/compile/MYCONF7 amd64
>Description:
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:  https://ftp.ipv6.uni-leipzig.de/netbsd/panic.png
>How-To-Repeat:
Compile the kernel with debug code and bring up an ixg interface
>Fix: