kern/47127: 32-bit fstat fails on 64-bit kernel

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>Number:         47127
>Category:       kern
>Synopsis:       32-bit fstat fails on 64-bit kernel
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 26 06:40:01 +0000 2012
>Originator:     Alan Barrett
>Release:        NetBSD 6.99.14
>Organization:
Not much
>Environment:
fstat from NetBSD-6.99.14/i386
kernel from netBSD-6.99.14/amd64
>Description:
        An i386 fstat(1) fails on am amd64 kernel, with messages like this:

fstat: can't read filedesc at 0x18c0c1c0 for pid 2553
fstat: can't read filedesc at 0xf8f5440 for pid 2321
fstat: can't read filedesc at 0x1beba740 for pid 3090

        The same failure would probably also occur with other
        pairs of machines, such as sparc userland on sparc64 kernel.

>How-To-Repeat:
>Fix: