segfault with llvm 9 on latest ubuntu releases

[whyrv]

Newer ubuntu releases after 20.04 (namely 21.10 and 22.04) crash when compiled with LLVM 9, in thread create. Problem is only with LLVM 9, latest LLVM (13 or above) and gcc both work ok. The crash is in thread creation.
To reproduce, run any of test[1 2..]

gdb ./test1 8 8 8
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff7a46640 (LWP 9687)]
[New Thread 0x7ffff7245640 (LWP 9688)]

Thread 2 "test1" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7a46640 (LWP 9687)]
0x00007ffff7e572c0 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) where
#0  0x00007ffff7e572c0 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#1  0x00007ffff7ae0b43 in start_thread (arg=<optimized out>)
    at ./nptl/pthread_create.c:442
#2  0x00007ffff7b72a00 in clone3 ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81