[Bug 227552] w, uptime i386 cordeump

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227552

--- Comment #11 from Dimitry Andric <dim at FreeBSD.org> ---
I'm now not so sure anymore about the TLS section being a problem. On a
stable/11 i386 box with r332318 (as of 2018-04-09), I do *not* see crashes in w
or uptime, even though the TLS section appears to be 0x50 bytes:

$ ldd /usr/bin/uptime
/usr/bin/uptime:
        libkvm.so.7 => /lib/libkvm.so.7 (0x28070000)
        libsbuf.so.6 => /lib/libsbuf.so.6 (0x2807d000)
        libxo.so.0 => /lib/libxo.so.0 (0x28080000)
        libutil.so.9 => /lib/libutil.so.9 (0x28099000)
        libc.so.7 => /lib/libc.so.7 (0x280ab000)
        libelf.so.2 => /lib/libelf.so.2 (0x2820a000)

$ uptime
 2:36PM  up 21 mins, 1 user, load averages: 0.32, 0.26, 0.23

$ readelf -l /lib/libxo.so.0 | grep 'Type\|TLS'
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  TLS            0x017160 0x00018764 0x00018764 0x00000 0x00050 R   0x8

$ readelf -l /usr/obj/usr/src/lib/libxo/libxo.so.0.full | grep 'Type\|TLS'
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  TLS            0x017160 0x00018160 0x00018160 0x00000 0x00658 R   0x8

$ readelf -l /usr/obj/usr/src/lib/libxo/libxo.so.0 | grep 'Type\|TLS'
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  TLS            0x017160 0x00018160 0x00018160 0x00000 0x00654 R   0x8

So, libxo.so.0.full, the actual output of the link stage, has a TLS MemSize of
0x658 bytes, libxo.so.0, which is produced by:

objcopy --strip-debug --add-gnu-debuglink=libxo.so.0.debug  libxo.so.0.full
libxo.so.0

has a TLS MemSize of 0x654 bytes, and the final version installed by
installworld, and stripped during that time, has a TLS MemSize of 0x50 bytes.

However, at this revision, r332318, it does not crash.

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