[orcjit] Creating a orc::LLJIT on multiple threads fails with UNW_ENOMEM error on Darwin #126611
Description
I have a situation where I'm trying to create JIT c++ code from multiple independent threads.
Minimum test case:
#include <iostream>
#include <thread>
#include <vector>
#include "llvm/Support/TargetSelect.h"
#include "llvm/ExecutionEngine/Orc/LLJIT.h"
int main(int argc, const char * argv[]) {
std::vector<std::thread> threads(std::thread::hardware_concurrency());
for (size_t i = 0, ie = threads.size(); i < ie; i++) {
threads[i] = std::thread([] (const size_t thread_number) -> void {
llvm::InitializeNativeTarget();
llvm::InitializeNativeTargetAsmPrinter();
auto jit_try = llvm::orc::LLJITBuilder().create();
if (auto jiterror = jit_try.takeError()) {
std::cerr << toString(std::move(jiterror)) << std::endl;
exit(-1);
}
}, i);
}
for (std::thread &t : threads) {
t.join();
}
}
When running the above code, I get an error reported from multiple threads
Could not register function via __unw_add_find_dynamic_unwind_sections, error code = -6541
It appears this broke some time during the week starting on February 3rd but I have not been able to narrow it down to a specific commit. I have only checked this on macOS 15 and 14. Additionally llvm was built from top of tree main branch.