cpuctl panic(!)

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

Surprise (-current/amd64):

# cpuctl identify 0
cpu0: highest basic info 0000000d
cpu0: highest extended info 80000008
cpu0: "Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz"
cpu0: Intel Xeon E3-12xx, 2nd gen i7, i5, i3 2xxx (686-class), 2492.10 MHz
cpu0: family 0x6 model 0x2a stepping 0x7 (id 0x206a7)
...
cpu0: xsave features 0x7<x87,SSE,AVX>
cpu0: xsave instructions 0x1<XSAVEOPT>
cpu0: xsave area size: current 832, maximum 832, xgetbv enabled
[1]   Segmentation fault (core dumped) cpuctl identify 0

Program terminated with signal 11, Segmentation fault.
#0  0x00000000004053d0 in x86_xgetbv ()
(gdb) bt
#0  0x00000000004053d0 in x86_xgetbv ()
#1  0x000000000040467d in identifycpu (fd=3, cpuname=0x7f7fffffdb30 "cpu0")
    at /usr/src/usr.sbin/cpuctl/arch/i386.c:1824
#2  0x0000000000401cd0 in cpu_identify (argv=0x7f7fffffdbd8)
    at /usr/src/usr.sbin/cpuctl/cpuctl.c:277
#3  0x0000000000401644 in main (argc=2, argv=0x7f7fffffdbd0)
    at /usr/src/usr.sbin/cpuctl/cpuctl.c:116

P