• d-bugmail puremagic.com (32/32) Aug 07 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8518
• d-bugmail puremagic.com (72/72) Feb 09 2013 http://d.puremagic.com/issues/show_bug.cgi?id=8518

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8518

           Summary: Segmentation fault in _memset128ii
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: jerro.public gmail.com



The following program causes a segmentations fault when compiled with -O
-inline -release with DMD 2.060 on 64 bit Linux:


struct A
{
    double a;
    double b;
}

void main()
{
    auto a = new A[2];
    a[] = A.init;
}

The core dump:

Core was generated by `./f'.
Program terminated with signal 11, Segmentation fault.


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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8518


hsteoh quickfur.ath.cx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hsteoh quickfur.ath.cx



Hmm. Looks like this issue is related to bug 9449.

Here's the disassembly of Dmain:

0000000000418bd0 <_Dmain>:
  418bd0:       55                      push   %rbp
  418bd1:       48 8b ec                mov    %rsp,%rbp
  418bd4:       48 83 ec 30             sub    $0x30,%rsp
  418bd8:       48 be 02 00 00 00 00    movabs $0x2,%rsi
  418bdf:       00 00 00 
  418be2:       48 bf f0 60 63 00 00    movabs $0x6360f0,%rdi
  418be9:       00 00 00 
  418bec:       e8 4f 19 00 00          callq  41a540 <_d_newarrayiT>
  418bf1:       48 89 45 e0             mov    %rax,-0x20(%rbp)
  418bf5:       48 89 55 e8             mov    %rdx,-0x18(%rbp)
  418bf9:       48 8b 75 e0             mov    -0x20(%rbp),%rsi
  418bfd:       f2 48 0f 10 05 3a 7d    rex.W movsd 0x17d3a(%rip),%xmm0       

est1A6__initZ+0x10>
  418c04:       01 00 
  418c06:       f2 48 0f 11 45 f0       rex.W movsd %xmm0,-0x10(%rbp)
  418c0c:       f2 48 0f 10 0d 2b 7d    rex.W movsd 0x17d2b(%rip),%xmm1       

est1A6__initZ+0x10>
  418c13:       01 00 
  418c15:       f2 48 0f 11 4d f8       rex.W movsd %xmm1,-0x8(%rbp)
  418c1b:       dd 45 f0                fldl   -0x10(%rbp)
  418c1e:       dd 45 f8                fldl   -0x8(%rbp)
  418c21:       dd 5d d0                fstpl  -0x30(%rbp)
  418c24:       f2 0f 10 4d d0          movsd  -0x30(%rbp),%xmm1
  418c29:       dd 5d d0                fstpl  -0x30(%rbp)
  418c2c:       f2 0f 10 45 d0          movsd  -0x30(%rbp),%xmm0
  418c31:       48 89 d7                mov    %rdx,%rdi
  418c34:       e8 7f 1d 00 00          callq  41a9b8 <_memset128ii>
  418c39:       31 c0                   xor    %eax,%eax
  418c3b:       c9                      leaveq 
  418c3c:       c3                      retq   

Here's the disassembly of _memset128ii:

000000000041a9b8 <_memset128ii>:
  41a9b8:       55                      push   %rbp
  41a9b9:       48 8b ec                mov    %rsp,%rbp
  41a9bc:       48 83 ec 20             sub    $0x20,%rsp
  41a9c0:       48 89 75 e8             mov    %rsi,-0x18(%rbp)
  41a9c4:       48 89 55 f0             mov    %rdx,-0x10(%rbp)
  41a9c8:       49 89 f8                mov    %rdi,%r8
  41a9cb:       49 89 fb                mov    %rdi,%r11
  41a9ce:       49 89 c9                mov    %rcx,%r9
  41a9d1:       49 c1 e1 04             shl    $0x4,%r9
  41a9d5:       4c 03 cf                add    %rdi,%r9
  41a9d8:       4d 3b c1                cmp    %r9,%r8
  41a9db:       73 18                   jae    41a9f5 <_memset128ii+0x3d>
  41a9dd:       48 8b 55 f0             mov    -0x10(%rbp),%rdx
  41a9e1:       48 8b 45 e8             mov    -0x18(%rbp),%rax
  41a9e5:       49 89 00                mov    %rax,(%r8)
  41a9e8:       49 89 50 08             mov    %rdx,0x8(%r8)
  41a9ec:       49 83 c0 10             add    $0x10,%r8
  41a9f0:       4d 39 c8                cmp    %r9,%r8
  41a9f3:       72 e8                   jb     41a9dd <_memset128ii+0x25>
  41a9f5:       49 8b c3                mov    %r11,%rax
  41a9f8:       48 8b e5                mov    %rbp,%rsp
  41a9fb:       5d                      pop    %rbp
  41a9fc:       c3                      retq   

Notice the Dmain fails to pass the expected parameters to _memset128ii, which
expects %rcx to be the count, %rdx to be the .ptr value of the array, but Dmain
does not set these registers, so they have garbage values.

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