oracle / oracle/graalpython

[Bug]: UnsupportedSpecializationException with tuple

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bug
Dominant language
Python
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Forks
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Avg merge
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Merged PRs (30d)
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Description

Describe the bug

GraalPy crashes when running this fuzzed code:

from platform import uname_result
uname_result.index(0, '')
Operating system

Linux

CPU architecture

x86_64

GraalPy version

GraalPy 3.13.14 (Oracle GraalVM Native 25.3.4.1)

JDK version

No response

Context configuration

No response

Steps to reproduce

Snippet listed above

Expected behavior

No crash

Stack trace
Unexpected values provided for TupleNodesFactory.GetTupleStorageNodeGen.Inlined@3fff4484: [TupleBuiltinsFactory.IndexNodeFactory.IndexNodeGen@6b2b70a1, 0], [IndexNodeGen,Integer]
com.oracle.truffle.api.dsl.UnsupportedSpecializationException: Unexpected values provided for TupleNodesFactory.GetTupleStorageNodeGen.Inlined@3fff4484: [TupleBuiltinsFactory.IndexNodeFactory.IndexNodeGen@6b2b70a1, 0], [IndexNodeGen,Integer]
	at org.graalvm.py/com.oracle.graal.python.nodes.builtins.TupleNodesFactory$GetTupleStorageNodeGen.newUnsupportedSpecializationException2(TupleNodesFactory.java:492)
	at org.graalvm.py/com.oracle.graal.python.nodes.builtins.TupleNodesFactory$GetTupleStorageNodeGen$Inlined.executeAndSpecialize(TupleNodesFactory.java:556)
	at org.graalvm.py/com.oracle.graal.python.nodes.builtins.TupleNodesFactory$GetTupleStorageNodeGen$Inlined.execute(TupleNodesFactory.java:539)
	at org.graalvm.py/com.oracle.graal.python.builtins.objects.tuple.TupleBuiltins$IndexNode.index(TupleBuiltins.java:178)
	at org.graalvm.py/com.oracle.graal.python.builtins.objects.tuple.TupleBuiltinsFactory$IndexNodeFactory$IndexNodeGen.executeWithoutClinic(TupleBuiltinsFactory.java:459)
	at org.graalvm.py/com.oracle.graal.python.nodes.function.builtins.PythonQuaternaryClinicBuiltinNode.execute(PythonQuaternaryClinicBuiltinNode.java:104)
	at org.graalvm.py/com.oracle.graal.python.nodes.function.builtins.BuiltinCallNode$BuiltinQuaternaryCallNode.execute(BuiltinCallNode.java:156)
	at org.graalvm.py/com.oracle.graal.python.nodes.function.BuiltinFunctionRootNode.execute(BuiltinFunctionRootNode.java:337)
	at org.graalvm.truffle.runtime/com.oracle.truffle.runtime.OptimizedCallTarget.executeRootNode(OptimizedCallTarget.java:808)
	at org.graalvm.truffle.runtime/com.oracle.truffle.runtime.OptimizedCallTarget.profiledPERoot(OptimizedCallTarget.java:722)
	at org.graalvm.truffle.runtime/com.oracle.truffle.runtime.OptimizedCallTarget.callBoundary(OptimizedCallTarget.java:641)
	at org.graalvm.truffle.runtime.svm/com.oracle.svm.truffle.api.SubstrateOptimizedCallTarget.invokeCallBoundary(SubstrateOptimizedCallTarget.java:124)
	at com.oracle.truffle.enterprise.svm/com.oracle.svm.enterprise.truffle.compiler.SubstrateEnterpriseOptimizedCallTarget.invokeCompiledAdapterOrCallBoundary(SubstrateEnterpriseOptimizedCallTarget.java:293)
	at com.oracle.truffle.enterprise.svm/com.oracle.svm.enterprise.truffle.compiler.SubstrateEnterpriseOptimizedCallTarget.invokeFromInterpreter(SubstrateEnterpriseOptimizedCallTarget.java:269)
	at com.oracle.truffle.enterprise.svm/com.oracle.svm.enterprise.truffle.compiler.SubstrateEnterpriseOptimizedCallTarget.doInvoke(SubstrateEnterpriseOptimizedCallTarget.java:255)
	at org.graalvm.truffle.runtime/com.oracle.truffle.runtime.OptimizedCallTarget.callDirect(OptimizedCallTarget.java:573)
	at org.graalvm.truffle.runtime/com.oracle.truffle.runtime.OptimizedCallTarget.call(OptimizedCallTarget.java:519)
	at org.graalvm.truffle/com.oracle.truffle.api.nodes.IndirectCallNode$1.call(IndirectCallNode.java:96)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallDispatchers$SimpleIndirectInvokeNode.doIndirect(CallDispatchers.java:167)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallDispatchersFactory$SimpleIndirectInvokeNodeGen$Uncached.execute(CallDispatchersFactory.java:307)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallDispatchers$BuiltinFunctionCachedCallNode.callBuiltinFunctionMegamorphic(CallDispatchers.java:265)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallDispatchersFactory$BuiltinFunctionCachedCallNodeGen$Uncached.execute(CallDispatchersFactory.java:1173)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallNode.builtinFunctionCall(CallNode.java:152)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallNodeGen$Uncached.executeInternal(CallNodeGen.java:619)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.CallNode.execute(CallNode.java:128)
	at org.graalvm.py/com.oracle.graal.python.nodes.call.special.CallTernaryMethodNode.call(CallTernaryMethodNode.java:176)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$CallTernaryMethod_Node.execute$uncached(PBytecodeDSLRootNodeGen.java)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$UncachedBytecodeNodeTailCall.handleCallTernaryMethod_(PBytecodeDSLRootNodeGen.java:37882)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$UncachedBytecodeNodeTailCall.__stub_handleCallTernaryMethod_(PBytecodeDSLRootNodeGen.java:0)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$UncachedBytecodeNodeTailCall.continueAt(PBytecodeDSLRootNodeGen.java:35093)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen.continueAt(PBytecodeDSLRootNodeGen.java:3501)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen.execute(PBytecodeDSLRootNodeGen.java:3493)
[...snip...]
Additional context

No response

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the crash with the provided uname_result.index(0, '') snippet, then inspect TupleBuiltins.java around IndexNode and the GetTupleStorageNode entry shown in the stack trace. The work is done when this call no longer raises UnsupportedSpecializationException and a regression test covers the reproducer.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, python
Domain
backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
68/100

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