https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278701
Bug ID: 278701
Summary: Certain usage of thread_local and -fPIE results in an
obscure message printout
Product: Base System
Version: 14.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: misc
Assignee: [email protected]
Reporter: [email protected]
freefall:~$ cat > main.cc
#include <string>
thread_local std::string s;
int main(int argc, char** argv)
{
s = "aaa";
return 0;
}
freefall:~$ c++ -fPIE main.cc -o main
freefall:~$ ./main
__cxa_thread_call_dtors: dtr 0x820b65830 from unloaded dso, skipping
freefall:~$
Same result with FreeBSD-14.0/clang-16.0.6 and FreeBSD-15.0/clang-18.1.4
The printed message is obscure because it is not clear if there is a bug in the
program or in the library or if I am supposed to do something to resolve the
problem. Also, I think, the destructor of `s` is not called.
The message is printed from walk_cb_call() from
lib/libc/stdlib/cxa_thread_atexit_impl.c.
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