segmentation fault in risc-v code

[MaxHearnden]

see https://github.com/MaxHearnden/rust-bug for accompanying files

The function tokio::runtime::scheduler::multi_thread::park::Parker::shutdown (which is _ZN91_$LT$tokio..runtime..scheduler..multi_thread..park..Parker$u20$as$u20$tokio..park..Park$GT$8shutdown17hc45107ddb2018849E in the provided files) contains a pattern match (present in the llvm-ir) which is not in the generated assembly. This causes a segmentation fault when the structure bound by the match is read on line 78373 in the generated assembly.

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rustc --version --verbose:

1.70

[apiraino]

@MaxHearnden it would be awesome to clarify this report and attach a reproducible MCVE, modulo the Nix files. Ideally including the rustc version that starts erroring. thanks

[MaxHearnden]

I have produced a fairly minimal reproduction at https://github.com/MaxHearnden/tokio-bug-repro
I am using rustc 1.71.1 and it fails on risc-v

[MaxHearnden]

I've found that commenting out https://github.com/llvm/llvm-project/blob/5897b449472e4848c2531e8bdeb6fba4f207f2c6/llvm/lib/Target/RISCV/RISCVExpandAtomicPseudoInsts.cpp#L592 generated the correct code

[MaxHearnden]

I've filed a bug report upstream llvm/llvm-project#65025 and there is a candidate patch https://reviews.llvm.org/D158962

[MaxHearnden]

fixed by #115959