[Mono] Null receiver in open virtual delegate invocation crashes the runtime
维护者通常 1 天内回复
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调研方向
The failure is a native SIGSEGV in mono_get_addr_compiled_method on Linux ARM64 and a klass assertion in class-accessors.c:73 under the WebAssembly interpreter, both during open virtual delegate invocation with a null receiver. Start from the test OpenDelegate.NullReceiverAfterWarmingUnrelatedVirtualDelegates in src/tests/CoreMangLib/system/delegate/VSD/OpenDelegate.cs and the Mono runtime's delegate invoke path. Done means the null-receiver call throws NullReferenceException on Mono and the SkipOnMono attribute can be removed.
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描述
Description
Invoking an open-instance delegate to a virtual method with a null receiver crashes Mono instead of throwing NullReferenceException.
This was exposed by OpenDelegate.NullReceiverAfterWarmingUnrelatedVirtualDelegates, added in dotnet/runtime#136949. The test creates delegates to virtual methods on two unrelated classes, warms both delegates with valid receivers, then invokes them with null receivers.
Reproduction
Use the test source before its Mono exclusion.
Run OpenDelegate.NullReceiverAfterWarmingUnrelatedVirtualDelegates on Mono. The first null-receiver invocation is:
Assert.Throws<NullReferenceException>(() => second(null, 1, 2, 3, 4));
Expected behavior
The invocation throws NullReferenceException, which the assertion catches. The test passes on CoreCLR.
Actual behavior
Reported CI failures in build 1667003:
- Mono Linux ARM64: native SIGSEGV in
mono_get_addr_compiled_methodduring the assertion’s lambda; process exits with code 134. - Mono WebAssembly interpreter: process aborts on the
klassassertion inclass-accessors.c:73.
These failures terminate the process rather than raising a catchable managed exception. Other Mono configurations have not been established.
Current mitigation
The test is excluded on Mono using method-level SkipOnMono; CoreCLR and sibling-test coverage remain enabled. Re-enable the test on Mono once null-receiver invocation throws the expected managed exception.
[!NOTE]
This issue description was drafted with GitHub Copilot.
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