| Issue |
179679
|
| Summary |
[mlir-opt] Crash in shape.broadcast folding: llvm::cast<DenseIntElementsAttr> failure triggered by tensor.rank with ub.poison
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Subway2023
|
The fold implementation of **shape.broadcast** performs an unchecked llvm::cast<DenseIntElementsAttr> on its operand attributes. When ub.poison is present, the attribute is a PoisonAttr, which causes the cast to fail.
```mlir
module {
func.func @main() {
%0 = shape.const_shape [1, 2, 3] : tensor<3xindex>
%1 = ub.poison : tensor<3xindex>
%2 = shape.broadcast %0, %1 : tensor<3xindex>, tensor<3xindex> -> tensor<3xindex>
%3 = tensor.rank %2 : tensor<3xindex>
}
}
```
```
mlir-opt --canonicalize temp.mlir
```
```
mlir-opt: /llvm-project-llvmorg-22.1.0-rc1/llvm/include/llvm/Support/Casting.h:566: decltype(auto) llvm::cast(From&) [with To = mlir::DenseIntElementsAttr; From = mlir::Attribute]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: /llvmorg-22.1.0-install/bin/mlir-opt --canonicalize temp.mlir
#0 0x000062a90a669e32 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/llvmorg-22.1.0-install/bin/mlir-opt+0x252fe32)
#1 0x000062a90a6665af llvm::sys::RunSignalHandlers() (/llvmorg-22.1.0-install/bin/mlir-opt+0x252c5af)
#2 0x000062a90a6666fc SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x00007225ab245330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x00007225ab29eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x00007225ab29eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x00007225ab29eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x00007225ab24527e raise ./signal/../sysdeps/posix/raise.c:27:6
#8 0x00007225ab2288ff abort ./stdlib/abort.c:81:7
#9 0x00007225ab22881b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x00007225ab23b517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#11 0x000062a90de20d0c mlir::shape::BroadcastOp::fold(mlir::shape::BroadcastOpGenericAdaptor<llvm::ArrayRef<mlir::Attribute>>) (/llvmorg-22.1.0-install/bin/mlir-opt+0x5ce6d0c)
#12 0x000062a90de75816 llvm::LogicalResult llvm::detail::UniqueFunctionBase<llvm::LogicalResult, mlir::Operation*, llvm::ArrayRef<mlir::Attribute>, llvm::SmallVectorImpl<mlir::OpFoldResult>&>::CallImpl<mlir::Op<mlir::shape::BroadcastOp, mlir::OpTrait::ZeroRegions, mlir::OpTrait::OneResult, mlir::OpTrait::OneTypedResult<mlir::Type>::Impl, mlir::OpTrait::ZeroSuccessors, mlir::OpTrait::VariadicOperands, mlir::OpTrait::OpInvariants, mlir::BytecodeOpInterface::Trait, mlir::OpTrait::IsCommutative, mlir::ConditionallySpeculatable::Trait, mlir::OpTrait::AlwaysSpeculatableImplTrait, mlir::MemoryEffectOpInterface::Trait>::getFoldHookFn()::'lambda'(mlir::Operation*, llvm::ArrayRef<mlir::Attribute>, llvm::SmallVectorImpl<mlir::OpFoldResult>&) const>(void*, mlir::Operation*, llvm::ArrayRef<mlir::Attribute>, llvm::SmallVectorImpl<mlir::OpFoldResult>&) (/llvmorg-22.1.0-install/bin/mlir-opt+0x5d3b816)
#13 0x000062a90de82f9e mlir::RegisteredOperationName::Model<mlir::shape::BroadcastOp>::foldHook(mlir::Operation*, llvm::ArrayRef<mlir::Attribute>, llvm::SmallVectorImpl<mlir::OpFoldResult>&) (/llvmorg-22.1.0-install/bin/mlir-opt+0x5d48f9e)
```
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