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port-amd64/37662: amd64 nmi handler is broken

>Number:         37662
>Category:       port-amd64
>Synopsis:       amd64 nmi handler is broken
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 01 22:20:00 +0000 2008
>Originator:     YAMAMOTO Takashi <>
>Release:        NetBSD 4.99.47
System: NetBSD 4.99.47
Architecture: amd64
        amd64 nmi handler can use inappropriate stack
        if an nmi happens at eg. the top of Xsyscall.
        code inspection.
        - allocate per-cpu stacks, and use IST to switch to the stack.
        - make tss per-cpu.  (otherwise context switch needs to update IST.)


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