[OmniOS-discuss] PowerDNS recursor SIGSEGV

Dan McDonald danmcd at omniti.com
Sun Dec 6 23:42:46 UTC 2015 

I wonder how the 014-compiled binary performs on 016?  More accurately, I wonder if any gcc-51 compiled libs are off?

Dan

Sent from my iPhone (typos, autocorrect, and all)

> On Dec 6, 2015, at 5:54 PM, Josef 'Jeff' Sipek <jeffpc at josefsipek.net> wrote:
> 
>> On Sun, Dec 06, 2015 at 03:40:30PM -0500, Josef 'Jeff' Sipek wrote:
>>> On Sun, Dec 06, 2015 at 10:26:00AM -0500, Dan McDonald wrote:
>>> One other weird thing to try -- build powerdns with the Illumos gcc4.  If
>>> the gcc5 bug affects powerdns, that'd isolate it.  If gcc5 affects some
>>> non Illumos library, gcc4 won't help and you'll still segv.
>>> 
>>> If gcc4 Illumos can't build it,
>> 
>> The powerdns devs use a lot of c++11 which makes 4.4.4 *waaay* too old.
>> Apparently, 4.8 should be good enough.
>> 
>>> you could try 014 and its gcc481.
>> 
>> Yeah, I'll try that.
> 
> Ok.  014 produces the same exact instructions as OI Hipster.  I wonder if
> gcc 5 changed some processor default.
> 
> Jeff.
> 
>> Thanks,
>> 
>> Jeff.
>> 
>>> 
>>> Dan
>>> 
>>> Sent from my iPhone (typos, autocorrect, and all)
>>> 
>>>> On Dec 6, 2015, at 9:45 AM, Josef 'Jeff' Sipek <jeffpc at josefsipek.net> wrote:
>>>> 
>>>> I compiled powerdns recursor [1] on 016, but I'm running into an occasional
>>>> SIGSEGV.  The SIGSEGV is because of insufficiently aligned memory operand to an
>>>> instruction.  (See the powerdns bug I filed for this [2].) The SIGSEGV actually
>>>> happens in the deque code which comes from boost (1.58.0 in this case).
>>>> 
>>>> Now, the weird thing... I compiled the same powerdns source with the same
>>>> version of boost on OI Hipster and OmniOS 016.  Hipster uses gcc 4.9.3,
>>>> OmniOS 016 uses 5.1.  The function that causes the SEGV on 016 looks totally
>>>> different between the two distros so I haven't see it die on my laptop.
>>>> 
>>>> Has anyone seen any strange SIGSEGVs in boost using software?  I hope it isn't
>>>> some sort of gcc bug.
>>>> 
>>>> Thanks,
>>>> 
>>>> Jeff.
>>>> 
>>>> P.S. PowerDNS uses {get,set,swap}context, so I haven't ruled out a stack
>>>>    alignment bug on their end.
>>>> 
>>>> [1] https://www.powerdns.com/
>>>> [2] https://github.com/PowerDNS/pdns/issues/3002
>>>> 
>>>> 
>>>> OmniOS 016:
>>>> 
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi:     pushl  %ebp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+1:   movl   %esp,%ebp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+3:   pushl  %ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+4:   subl   $0x1c,%esp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+7:   movl   0xc(%ebp),%eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0xa: movl   0x8(%ebp),%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0xd: movdqu (%eax),%xmm0
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x11:movl   0x10(%ebp),%eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x14:movaps %xmm0,-0x18(%ebp)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x18:negl   %eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x1a:pushl  %eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x1b:leal   -0x18(%ebp),%eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x1e:pushl  %eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x1f:call   -0x94    <_ZNSt15_Deque_iteratorIcRcPcEpLEi>
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x24:movl   (%eax),%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x26:addl   $0x10,%esp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x29:movl   %edx,(%ebx)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x2b:movl   0x4(%eax),%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x2e:movl   %edx,0x4(%ebx)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x31:movl   0x8(%eax),%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x34:movl   0xc(%eax),%eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x37:movl   %edx,0x8(%ebx)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x3a:movl   %eax,0xc(%ebx)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x3d:movl   %ebx,%eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x3f:movl   -0x4(%ebp),%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x42:leave  
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x43:ret    $0x4
>>>> 
>>>> 
>>>> OI Hipster:
>>>> 
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi:     pushl  %ebp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+1:   pushl  %edi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+2:   pushl  %esi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+3:   pushl  %ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+4:   subl   $0x14,%esp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+7:   movl   0x2c(%esp),%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0xb: movl   0x30(%esp),%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0xf: movl   0x28(%esp),%eax
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x13:movl   (%edx),%esi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x15:movl   0x4(%edx),%ecx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x18:movl   0x8(%edx),%edi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x1b:movl   0xc(%edx),%ebp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x1e:movl   %esi,%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x20:subl   %ebx,%esi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x22:subl   %ecx,%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x24:subl   %ebx,%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x26:cmpl   $0x1ff,%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x2c:movl   %esi,(%esp)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x2f:jbe    +0x21    <_ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x52>
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x31:movl   %edx,%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x33:sarl   $0x9,%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x36:testl  %edx,%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x38:jle    +0x56    <_ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x90>
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x3a:leal   0x0(%ebp,%ebx,4),%ebp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x3e:movl   0x0(%ebp),%ecx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x41:shll   $0x9,%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x44:subl   %ebx,%edx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x46:leal   (%ecx,%edx),%esi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x49:leal   0x200(%ecx),%edi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x4f:movl   %esi,(%esp)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x52:movl   %edi,0x4(%esp)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x56:movd   (%esp),%xmm0
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x5b:movl   %ecx,(%esp)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x5e:movd   0x4(%esp),%xmm1
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x64:movl   %ebp,0x4(%esp)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x68:movd   (%esp),%xmm3
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x6d:punpckldq %xmm3,%xmm0
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x71:movd   0x4(%esp),%xmm2
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x77:punpckldq %xmm2,%xmm1
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x7b:punpcklqdq %xmm1,%xmm0
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x7f:movdqu %xmm0,(%eax)
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x83:addl   $0x14,%esp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x86:popl   %ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x87:popl   %esi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x88:popl   %edi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x89:popl   %ebp
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x8a:ret    $0x4
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x8d:leal   0x0(%esi),%esi
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x90:movl   %edx,%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x92:shrl   $0x9,%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x95:orl    $0xff800000,%ebx
>>>> _ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x9b:jmp    -0x63    <_ZNKSt15_Deque_iteratorIcRcPcEmiEi+0x3a>
>>>> 
>>>> -- 
>>>> I'm somewhere between geek and normal.
>>>>       - Linus Torvalds
>>>> _______________________________________________
>>>> OmniOS-discuss mailing list
>>>> OmniOS-discuss at lists.omniti.com
>>>> http://lists.omniti.com/mailman/listinfo/omnios-discuss
>> 
>> -- 
>> The box said "Windows XP or better required". So I installed Linux.
> 
> -- 
> If I have trouble installing Linux, something is wrong. Very wrong.
>        - Linus Torvalds

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