[LLVMdev] 'opt' Aborted "While deleting: void %"

[Duncan Sands]

Hi Griffin,

> Using Valgrind hasn't shown me anything terribly unusual.  And I'm confused
> because its not even trying to delete a real instruction; deleting a void
> type with no name? That doesn't make any sense...
>
> Any other hints?  I've seen a few posts in the past about this relating to
> some internal LLVM bugs...

try running in gdb.  When you hit the assert, rummage around.

Ciao, Duncan.

>
> -Griffin
>
> On Thu, 12 Jan 2012 21:26:41 +0100, Duncan Sands<baldrick at free.fr>  wrote:
>> Hi Griffin, did your pass create a data structure that holds values
>> somehow,
>> and forgot to delete it?  Also, try running under valgrind in case this
> is
>> due to a memory error of some kind.
>>
>> Ciao, Duncan.
>>
>>> So I have an LLVM pass that appears to run completely and work fine, and
>>> then it aborts at the very end.  When exiting the final runOnFunction
>>> call,
>>> I get the following error / stack dump.  I cannot figure out why this is
>>> happening for the life of me - does anyone have any ideas?  I'm not
>>> trying
>>> to do any crazy deallocation or anything, it just seems like a normal
>>> pass
>>> to me.
>>>
>>> Thanks,
>>> Griffin Wright
>>>
>>> While deleting: void %
>>> An asserting value handle still pointed to this value!
>>> UNREACHABLE executed at
>>> /x/grwright/llvm/llvm-2.9/lib/VMCore/Value.cpp:569!
>>> 0  libLLVM-2.9.so 0xf6ef856b
>>> 1  libLLVM-2.9.so 0xf6ef82f8
>>> 2                 0xf7782400 __kernel_sigreturn + 0
>>> 3  libc.so.6      0xf57d4d52 abort + 386
>>> 4  libLLVM-2.9.so 0xf6ee40d4 llvm::SmallVector<char,
> 64u>::~SmallVector()
>>> +
>>> 0
>>> 5  libLLVM-2.9.so 0xf6a5ce2e
>>> llvm::ValueHandleBase::ValueIsDeleted(llvm::Value*) + 662
>>> 6  libLLVM-2.9.so 0xf6a5b1ec llvm::Value::~Value() + 58
>>> 7  libLLVM-2.9.so 0xf66ee041 llvm::User::~User() + 93
>>> 8  libLLVM-2.9.so 0xf6a00d89 llvm::Instruction::~Instruction() + 121
>>> 9  libLLVM-2.9.so 0xf6a0351f llvm::CallInst::~CallInst() + 57
>>> 10 libLLVM-2.9.so 0xf68d9671
>>>
> llvm::ilist_node_traits<llvm::Instruction>::deleteNode(llvm::Instruction*)
>>> + 30
>>> 11 libLLVM-2.9.so 0xf68d8c80 llvm::iplist<llvm::Instruction,
>>> llvm::ilist_traits<llvm::Instruction>
>>>> ::erase(llvm::ilist_iterator<llvm::Instruction>) + 48
>>> 12 libLLVM-2.9.so 0xf696ac37 llvm::iplist<llvm::Instruction,
>>> llvm::ilist_traits<llvm::Instruction>
>>>> ::erase(llvm::ilist_iterator<llvm::Instruction>,
>>> llvm::ilist_iterator<llvm::Instruction>) + 49
>>> 13 libLLVM-2.9.so 0xf696a7a0 llvm::iplist<llvm::Instruction,
>>> llvm::ilist_traits<llvm::Instruction>   >::clear() + 102
>>> 14 libLLVM-2.9.so 0xf6969420 llvm::BasicBlock::~BasicBlock() + 314
>>> 15 libLLVM-2.9.so 0xf696adb2
>>> llvm::ilist_node_traits<llvm::BasicBlock>::deleteNode(llvm::BasicBlock*)
>>> +
>>> 30
>>> 16 libLLVM-2.9.so 0xf696a9a8 llvm::iplist<llvm::BasicBlock,
>>> llvm::ilist_traits<llvm::BasicBlock>
>>>> ::erase(llvm::ilist_iterator<llvm::BasicBlock>) + 48
>>> 17 libLLVM-2.9.so 0xf696958f llvm::BasicBlock::eraseFromParent() + 77
>>> 18 libLLVM-2.9.so 0xf69b7b11 llvm::Function::dropAllReferences() + 159
>>> 19 libLLVM-2.9.so 0xf6a2dc59 llvm::Module::dropAllReferences() + 81
>>> 20 libLLVM-2.9.so 0xf6a2caf2 llvm::Module::~Module() + 50
>>> 21 opt            0x08081e36 std::auto_ptr<llvm::Module>::~auto_ptr() +
>>> 36
>>> 22 opt            0x0807d5a4 main + 5045
>>> 23 libc.so.6      0xf57bdbd6 __libc_start_main + 230
>>> 24 opt            0x0806de41
>>> Stack dump:
>>> 0.	Program arguments: opt -debug -load
>>> /x/grwright/llvm/llvm-sfi/RelRecovery/Debug+Asserts/lib/relRecovery.so
>>> -profile-loader -profile-info-file=164.gzip/llvmprof.out -relRecovery
>>> -rr-analysis-only -rr-use-exec-prof=true -rr-bench=164.gzip
>>> 164.gzip/164.gzip.link.bc -o 164.gzip/164.gzip.rel.bc
>>> Aborted
>>>
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