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bin/54220: cpuctl identify segfault on AMD Phenom(tm) II X6 1100T Processor

>Number:         54220
>Category:       bin
>Synopsis:       cpuctl identify segfault on AMD Phenom(tm) II X6 1100T Processor
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 19 20:50:00 +0000 2019
>Originator:     Tobias Ulmer
>Release:        NetBSD 8.99.40
NetBSD 8.99.40 NetBSD 8.99.40 (GENERIC) #0: Wed May 15 04:39:52 UTC 2019 amd64
root@phenom:cpuctl$ obj/cpuctl identify 0
cpu0: highest basic info 00000006
cpu0: highest extended info 8000001b
cpu0: "AMD Phenom(tm) II X6 1100T Processor"
cpu0: AMD Family 10h (686-class), 3498.22 MHz
cpu0: family 0x10 model 0xa stepping 0 (id 0x100fa0)
cpu0: features 0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE>
cpu0: features 0x178bfbff<MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
cpu0: features1 0x802009<SSE3,MONITOR,CX16,POPCNT>
cpu0: features2 0xefd3fbff<LONG,3DNOW2,3DNOW>
cpu0: I-cache 64KB 64B/line 2-way, D-cache 64KB 64B/line 2-way
cpu0: L2 cache 512KB 64B/line 16-way
cpu0: L3 cache 6MB 64B/line 48-way
cpu0: ITLB 32 4KB entries fully associative, 16 2MB entries fully associative
cpu0: DTLB 48 4KB entries fully associative, 48 2MB entries fully associative
cpu0: L2 ITLB 512 4KB entries 4-way
cpu0: L2 DTLB 512 4KB entries 4-way, 128 2MB entries 2-way
cpu0: L1 1GB page DTLB 48 1GB entries fully associative
cpu0: L2 1GB page DTLB 16 1GB entries 8-way
cpu0: Initial APIC ID 0
Memory fault (core dumped)
root@phenom:cpuctl$ gdb ./obj/cpuctl ./cpuctl.core
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Reading symbols from ./obj/cpuctl...done.
[New process 1]
Core was generated by `cpuctl'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000114606d3b in rdmsr ()
(gdb) disassemble 
Dump of assembler code for function rdmsr:
   0x0000000114606d30 <+0>:     mov    %rdi,%rcx
   0x0000000114606d33 <+3>:     xor    %rax,%rax
   0x0000000114606d36 <+6>:     mov    $0x9c5a203a,%edi
=> 0x0000000114606d3b <+11>:    rdmsr  
   0x0000000114606d3d <+13>:    shl    $0x20,%rdx
   0x0000000114606d41 <+17>:    or     %rdx,%rax
   0x0000000114606d44 <+20>:    retq   
End of assembler dump.
(gdb) bt
#0  0x0000000114606d3b in rdmsr ()
#1  0x00000001146068a6 in identifycpu_cpuids_amd (ci=0x7f7fff6075a0) at /usr/src/usr.sbin/cpuctl/arch/i386.c:1963
#2  identifycpu_cpuids (ci=0x7f7fff6075a0) at /usr/src/usr.sbin/cpuctl/arch/i386.c:2011
#3  identifycpu (fd=3, cpuname=0x7f7fff607860 "cpu0") at /usr/src/usr.sbin/cpuctl/arch/i386.c:2247
#4  0x0000000114603286 in cpu_identify (argv=0x7f7fff607928) at /usr/src/usr.sbin/cpuctl/cpuctl.c:288
#5  0x0000000114606df4 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/usr.sbin/cpuctl/cpuctl.c:117
(gdb) info registers
rax            0x0      0
rbx            0x7f7fff607860   140187722086496
rcx            0xc001001f       3221291039
rdx            0x178bfbff       395049983
rsi            0x7f7fff6074a0   140187722085536
rdi            0x9c5a203a       2623152186
rbp            0x7f7fff607860   0x7f7fff607860
rsp            0x7f7fff607438   0x7f7fff607438
r8             0x0      0
r9             0x1      1
r10            0x0      0
r11            0x206    518
r12            0x4      4
r13            0x0      0
r14            0x3      3
r15            0x10     16
rip            0x114606d3b      0x114606d3b <rdmsr+11>
eflags         0x10246  [ PF ZF IF RF ]
cs             0x47     71
ss             0x3f     63
ds             0x23     35
es             0x23     35
fs             0x0      0
gs             0x0      0

Note that rdmsr() is only called for family 0x10 and older:

AMD documentation is pretty clear this is a ring 0 instruction only,
but maybe some registers are ok on some models? It fails on this CPU anyway.


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