CODEWITHSUNDEEP
c++g++thread-sanitizer
Paul Floyd
Paul Floyd

Reputation: 6936

FATAL: ThreadSanitizer: unexpected memory mapping GCC 13.2

I've already seen FATAL: ThreadSanitizer: unexpected memory mapping when running on Linux Kernels 6.6+ (for clang) and Thread sanitizer complaining of unexpected memory map (with an answer saying not to use -pie -fPIC which I'm not using).

Not that it would be actually relevant but here is a MRE:

#include <iostream>

int main()
{
   std::cout << "Hello, world!\n";
}

g++ -g -o hw hw.cpp -fsanitize=thread -pthread

./hw
FATAL: ThreadSanitizer: unexpected memory mapping 0x80000004b000-0x80000004f000

This is on Rocky 8.9 x86_64. So far I suspect that this is an ASLR issue. I don't have root access so I can't check or change the values of vm.mmap_rnd_bits or vm.mmap_rnd_compat_bits. /proc/sys/kernel/randomize_va_space is zero.

I've tried clang++ 18.1.7 and it seems to work OK. I've tried a few other versions of GCC (8.5, 5.3) same problem.

I've also tried on a different machine at a different location. That worked OK. Again, I don't have root access and I don't know exactly how the machines were configured. I've opened a support ticket with our IT.

EDIT: Both machines have vm.mmap_rnd_bits = 28

Upvotes: 2

Views: 523

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