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GeezerVison is showing github.com — [Bug]: NullPointerException with top-level `async for` · Issue #1287 · oracle/graalpython

[Bug]: NullPointerException with top-level async for #1287

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[Bug]: NullPointerException with top-level async for#1287
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Description

@correctmost
correctmost
opened on Nov 4, 2026
Issue body actions

Describe the bug

GraalPy crashes when running this fuzzed code:

async for i in range(1):
    pass

Operating system

Linux

CPU architecture

x86_64

GraalPy version

GraalPy 3.13.14 (Oracle GraalVM Native 25.5.5.0.3)

JDK version

No response

Context configuration

No response

Steps to reproduce

Snippet listed above

Expected behavior

No crash

Stack trace

java.lang.NullPointerException: Stack trace is imprecise, the top frames are missing and/or have wrong line numbers. To get precise stack traces, build the image with option -H:-ReduceImplicitExceptionStackTraceInformation
	at org.graalvm.py/com.oracle.graal.python.compiler.ParserCallbacksImpl.raiseSyntaxError(ParserCallbacksImpl.java:126)
	at org.graalvm.py/com.oracle.graal.python.compiler.ParserCallbacksImpl.raiseSyntaxError(ParserCallbacksImpl.java:122)
	at org.graalvm.py/com.oracle.graal.python.compiler.ParserCallbacksImpl.onError(ParserCallbacksImpl.java:118)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:4095)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:2033)
	at org.graalvm.py/com.oracle.graal.python.pegparser.sst.StmtTy$AsyncFor.accept(StmtTy.java:307)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visitModuleBody(RootNodeCompiler.java:1092)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.lambda$visit$0(RootNodeCompiler.java:1009)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$Bytecode.create(PBytecodeDSLRootNodeGen.java:5219)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen.create(PBytecodeDSLRootNodeGen.java:3972)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.compileRootNode(RootNodeCompiler.java:533)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visit(RootNodeCompiler.java:1007)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visit(RootNodeCompiler.java:189)
	at org.graalvm.py/com.oracle.graal.python.pegparser.sst.ModTy$Module.accept(ModTy.java:68)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.compile(RootNodeCompiler.java:758)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.BytecodeDSLCompiler.compile(BytecodeDSLCompiler.java:90)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.compileForBytecodeDSLInterpreter(PythonLanguage.java:675)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.compileModule(PythonLanguage.java:647)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.parse(PythonLanguage.java:615)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.parse(PythonLanguage.java:602)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.parse(PythonLanguage.java:588)
[...snip...]

Additional context

No response

Activity

  1. correctmost
    added
    bugSomething isn't workingSomething isn't working
    on Nov 4, 2026
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