[Bug 199891] 'vmstat -i' output is wrong on RPi

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199891

            Bug ID: 199891
           Summary: 'vmstat -i' output is wrong on RPi
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jiashiun at gmail.com

Created attachment 156288
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156288&action=edit
original 'vmstat -i' output on RPi

'vmstat -i' output is wrong on RPi. (See attached file)

The cause is in sufficient check for end of intrnames in dointr(). It only
looks for zero-length string as end of buffer. But on every architecture
FreeBSD supports, intrnames are all initialized to array of strings of 19
spaces plus NUL in kernel. The check will always make intrname run over the end
of buffer.

x86 does not see this probably due to implementation of memory allocator. On
arch like RPi, vmstat did not encounter immediate consecutive \0s to be
intepreted as zero-length string. Thus it treated data after the buffer as long
interrupt names.

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