| Issue |
134367
|
| Summary |
StackSafetyLocalAnalysis Assertion failed with ASAN
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
van-ema
|
While compiling rust standard library with optimizatons and asan I found a similar issue to https://github.com/llvm/llvm-project/issues/87923
```
rustc: /home/ubuntu/rust-misc/llvm-project/llvm/lib/Analysis/StackSafetyAnalysis.cpp:540: void {anonymous}::StackSafetyLocalAnalysis::analyzeAllUses(llvm::Value*, {anonymous}::UseInfo<llvm::GlobalValue>&, const llvm::StackLifetime&): Assertion `isa<Function>(Callee) || isa<GlobalAlias>(Callee)' failed.
error: could not compile `std` (lib)
```
to reproduce run any rust program with
```
RUSTFLAGS="-C opt-level=3 -Zsanitizer=address" cargo build --target x86_64-unknown-linux-gnu -Zbuild-std
```
issue can be reproduced at any opt level > 0
Rust version: 1.82
llvm: llvmorg-19.1.4
Debugging this I found that assertion `assert(isa<Function>(Callee) || isa<GlobalAlias>(Callee));` fails because of
`@getrandom = extern_weak global i8 at %13 = tail call noundef i64 @getrandom(ptr noundef nonnull %ptr46, i64 noundef %new_len45, i32 noundef 4) #25, !dbg !1007 in module std.33b5cc56158b1412-cgu.15`
My workaround for now is to not take `GlobalVariable` Callee(s)
```
const GlobalValue *Callee =
dyn_cast<GlobalValue>(CB.getCalledOperand()->stripPointerCasts());
if (!Callee || isa<GlobalIFunc>(Callee) || isa<GlobalVariable>(Callee)) {
US.addRange(I, UnknownRange, /*IsSafe=*/false);
break;
}
```
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