<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/70913>70913</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [mlir] --remove-dead-values crashed with assertion failure `!NodePtr->isKnownSentinel()'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            mlir
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          wangzhiyingh
      </td>
    </tr>
</table>

<pre>
    git version: 604eff60abfce09f956c3b0b1414f8d0d04b5d47

system: `Ubuntu 20.04.6 LTS (Focal Fossa)`

reproduced with: `mlir-opt --remove-dead-values a.mlir`

a.mlir:
```
func.func private @mlirAsyncRuntimGetNumWorkerThreads() -> index
```
trace:
```
mlir-opt: /data/cangku/llvm-project/llvm/include/llvm/ADT/ilist_iterator.h:138: llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::reference llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::operator*() const [with OptionsT = llvm::ilist_detail::node_options<mlir::Block, true, false, void, false>; bool IsReverse = false; bool IsConst = false; llvm::ilist_iterator<OptionsT, IsReverse, IsConst>::reference = mlir::Block&]: Assertion `!NodePtr->isKnownSentinel()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: /data/cangku/llvm-project/build/bin/mlir-opt --remove-dead-values bug1.mlir
 #0 0x00005647e522aeaf llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/data/cangku/llvm-project/build/bin/mlir-opt+0x15d8eaf)
 #1 0x00005647e5227f44 SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f7bad297420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #3 0x00007f7bacd6400b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #4 0x00007f7bacd43859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #5 0x00007f7bacd43729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #6 0x00007f7bacd54fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #7 0x00005647eabf1aec mlir::function_interface_impl::eraseFunctionArguments(mlir::FunctionOpInterface, llvm::BitVector const&, mlir::Type) (/data/cangku/llvm-project/build/bin/mlir-opt+0x6f9faec)
 #8 0x00005647e7dde65f (anonymous namespace)::cleanFuncOp(mlir::FunctionOpInterface, mlir::Operation*, mlir::dataflow::RunLivenessAnalysis&) RemoveDeadValues.cpp:0:0
 #9 0x00005647e7de5cc0 void llvm::function_ref<void (mlir::Operation*)>::callback_fn<(anonymous namespace)::RemoveDeadValues::runOnOperation()::'lambda0'(mlir::Operation*)>(long, mlir::Operation*) RemoveDeadValues.cpp:0:0
#10 0x00005647e7de6cd0 (anonymous namespace)::RemoveDeadValues::runOnOperation() RemoveDeadValues.cpp:0:0
#11 0x00005647e7d9277e mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) (/data/cangku/llvm-project/build/bin/mlir-opt+0x414077e)
#12 0x00005647e7d92c5a mlir::detail::OpToOpPassAdaptor::runPipeline(mlir::OpPassManager&, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) (/data/cangku/llvm-project/build/bin/mlir-opt+0x4140c5a)
#13 0x00005647e7d93484 mlir::PassManager::run(mlir::Operation*) (/data/cangku/llvm-project/build/bin/mlir-opt+0x4141484)
#14 0x00005647e7d8420b performActions(llvm::raw_ostream&, std::shared_ptr<llvm::SourceMgr> const&, mlir::MLIRContext*, mlir::MlirOptMainConfig const&) MlirOptMain.cpp:0:0
#15 0x00005647e7d856c4 processBuffer(llvm::raw_ostream&, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, mlir::MlirOptMainConfig const&, mlir::DialectRegistry&, llvm::ThreadPool*) MlirOptMain.cpp:0:0
#16 0x00005647e7d85874 mlir::LogicalResult llvm::function_ref<mlir::LogicalResult (std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&)>::callback_fn<mlir::MlirOptMain(llvm::raw_ostream&, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&)::'lambda'(std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&)>(long, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&) MlirOptMain.cpp:0:0
#17 0x00005647e7e81dc4 mlir::splitAndProcessBuffer(std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::function_ref<mlir::LogicalResult (std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&)>, llvm::raw_ostream&, bool, bool) (/data/cangku/llvm-project/build/bin/mlir-opt+0x422fdc4)
#18 0x00005647e7d7e327 mlir::MlirOptMain(llvm::raw_ostream&, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&) (/data/cangku/llvm-project/build/bin/mlir-opt+0x412c327)
#19 0x00005647e7d859c1 mlir::MlirOptMain(int, char**, llvm::StringRef, llvm::StringRef, mlir::DialectRegistry&) (/data/cangku/llvm-project/build/bin/mlir-opt+0x41339c1)
#20 0x00005647e7d85e26 mlir::MlirOptMain(int, char**, llvm::StringRef, mlir::DialectRegistry&) (/data/cangku/llvm-project/build/bin/mlir-opt+0x4133e26)
#21 0x00005647e5162deb main (/data/cangku/llvm-project/build/bin/mlir-opt+0x1510deb)
#22 0x00007f7bacd45083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#23 0x00005647e51fb61e _start (/data/cangku/llvm-project/build/bin/mlir-opt+0x15a961e)
Aborted (core dumped)
```
</pre>
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