illegal instruction error with "get_d"

edA-qa mort-ora-y eda-qa at
Wed Apr 2 17:36:38 UTC 2014

I also have the reproduction code working. Although it was linking
against the correct libraries it was running with a different version.
That version also happens to have the same so version name. But I guess
ArchLinux was compiled with different flags, thus it works.

Note: Just in case you're wondering, I don't use the system libraries
since on many of my target platforms the default libgmp is too old. It
just happens to be new on ArchLinux.

On 02/04/14 19:22, Torbjorn Granlund wrote:
> edA-qa mort-ora-y <eda-qa at> writes:
>   Program received signal SIGILL, Illegal instruction.
>   0x00007ffff433b70e in __gmpn_get_d () from /opt/gmp/install/lib/
>   (gdb) x/10i $pc
>   => 0x7ffff433b70e <__gmpn_get_d+158>:   vmovsd -0x8(%rsp),%xmm0
>      0x7ffff433b714 <__gmpn_get_d+164>:   retq
>      0x7ffff433b715 <__gmpn_get_d+165>:   nopl   (%rax)
>      0x7ffff433b718 <__gmpn_get_d+168>:   cmp    $0x1,%rsi
>      0x7ffff433b71c <__gmpn_get_d+172>:   jle    0x7ffff433b6bf
>   <__gmpn_get_d+79>
>      0x7ffff433b71e <__gmpn_get_d+174>:   mov    -0x10(%r9),%rsi
>      0x7ffff433b722 <__gmpn_get_d+178>:   mov    %eax,%ecx
>      0x7ffff433b724 <__gmpn_get_d+180>:   shr    %cl,%rsi
>      0x7ffff433b727 <__gmpn_get_d+183>:   or     %rsi,%rdi
>      0x7ffff433b72a <__gmpn_get_d+186>:   jmp    0x7ffff433b6bf
>   <__gmpn_get_d+79>
> I think that nails it. There were problems in old Xen releases too with
> AVX instructions.  But wait, perhaps your GMP build is misconfigured,
> and your CPU doesn't really handle AVX insn?
> I cannot find any mention of the CPU type and GMP configure string used
> in your bug report.
> If this is a similar bug to te one in Xen, than we're stuck.  Xen claims
> support in CPUid (both AVX and XSAVE bits are set).  But AVX
> instructions all yield ILLOPsignals.
> Torbjörn
> Please encrypt, key id 0xC8601622

edA-qa mort-ora-y

Leaf - the language we always wanted

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