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Postings from September 2012
On Sun, Sep 02, 2012 at 12:14:47AM +1000, Tony Cook wrote:
> 1..16
> ==73082==
> ==73082== Process terminating with default action of signal 11 (SIGSEGV)
> ==73082== General Protection Fault
> ==73082== at 0x1000D9DD3: Perl_sv_force_normal_flags (sv.c:9505)
> ==73082== by 0x1000E6147: Perl_sv_setsv_flags (sv.c:3910)
> ==73082== by 0x1000C9BDF: Perl_pp_sassign (pp_hot.c:212)
> ==73082== by 0x10009EA8A: Perl_runops_debug (dump.c:2134)
> ==73082== by 0x100026E77: perl_run (perl.c:2392)
> ==73082== by 0x100001779: main (perlmain.c:114)
> ==73082==
>
> if(SvTYPE(sv) == SVt_PVGV) {
> /* need to keep SvANY(sv) in the right arena */
> xpvmg = new_XPVMG();
> --> StructCopy(SvANY(sv), xpvmg, XPVMG);
> del_XPVGV(SvANY(sv));
> SvANY(sv) = xpvmg;
>
> SvFLAGS(sv) &= ~SVTYPEMASK;
> SvFLAGS(sv) |= SVt_PVMG;
> }
>
> (gdb) print sv->sv_any
> $3 = (void *) 0x1008cc118
>
> rip is 0x1000d9dd3
>
> 0x00000001000d9dcf <Perl_sv_force_normal_flags+1263>: mov 0x0(%r13),%rcx
> -->0x00000001000d9dd3 <Perl_sv_force_normal_flags+1267>: movaps (%rcx),%xmm0
> 0x00000001000d9dd6 <Perl_sv_force_normal_flags+1270>: movaps 0x10(%rcx),%xmm1
> 0x00000001000d9dda <Perl_sv_force_normal_flags+1274>: movaps 0x20(%rcx),%xmm2
> 0x00000001000d9dde <Perl_sv_force_normal_flags+1278>: movaps 0x30(%rcx),%xmm3
> 0x00000001000d9de2 <Perl_sv_force_normal_flags+1282>: movaps %xmm3,0x30(%rax)
> 0x00000001000d9de6 <Perl_sv_force_normal_flags+1286>: movaps %xmm2,0x20(%rax)
> 0x00000001000d9dea <Perl_sv_force_normal_flags+1290>: movaps %xmm1,0x10(%rax)
> 0x00000001000d9dee <Perl_sv_force_normal_flags+1294>: movaps %xmm0,(%rax)
OK, thanks. I don't know any x86_64 assembler, nor do I know its alignment
constrains or whatnot, so I'm not able to work out from this what went
wrong. And whether it's us doing something dodgy or them.
Is anyone else able to work backwards from this to what the cause is?
Nicholas Clark
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