[Bug]: NullPointerException with top-level `async with`

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#1,097 opened on Aug 25, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 68/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Active
Tech stack: java, python
Domain: compilers

Research direction

Start by reproducing the top-level async with _: snippet on Linux with GraalPy 3.13.14, then trace the failure through ParserCallbacksImpl.raiseSyntaxError and RootNodeCompiler's statement visitor. Done means the snippet no longer crashes with a NullPointerException and produces the expected non-crashing behavior.

Written by the indexing model from the issue text.

Description

bug

Describe the bug

GraalPy crashes when running this fuzzed code:

async with _:
    pass

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

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$StatementCompiler.visit(RootNodeCompiler.java:3953)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:2001)
	at org.graalvm.py/com.oracle.graal.python.pegparser.sst.StmtTy$AsyncWith.accept(StmtTy.java:381)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visitModuleBody(RootNodeCompiler.java:1090)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.lambda$visit$0(RootNodeCompiler.java:1007)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$Bytecode.create(PBytecodeDSLRootNodeGen.java:4988)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen.create(PBytecodeDSLRootNodeGen.java:3790)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.compileRootNode(RootNodeCompiler.java:530)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visit(RootNodeCompiler.java:1005)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visit(RootNodeCompiler.java:186)
	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:755)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.BytecodeDSLCompiler.compile(BytecodeDSLCompiler.java:86)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.compileForBytecodeDSLInterpreter(PythonLanguage.java:661)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.compileModule(PythonLanguage.java:633)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.parse(PythonLanguage.java:601)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.parse(PythonLanguage.java:588)
	at org.graalvm.py/com.oracle.graal.python.PythonLanguage.parse(PythonLanguage.java:574)
[...snip...]

Additional context

No response

Dominant language: Python
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More Python issues

[Bug]: NullPointerException with top-level `async with`

Assessment

Research direction

Description

Describe the bug

Operating system

CPU architecture

GraalPy version

JDK version

Context configuration

Steps to reproduce

Expected behavior

Stack trace

Additional context

Contributor guide

First steps

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