https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103537
--- Comment #4 from Hedayat Vatankhah <hedayat.fwd at gmail dot com> --- Well, sorry if I should gave more logs to make it more clear. Note that the crash happens here: https://github.com/hedayat/powerfake/blob/a4c80d6628816656796d2e85b4422218da05ce00/powerfake.h#L257 And the problematic code doesn't use any of the parts of the code you mentioned. To make the scope of the problem much less, I replaced main() function as follows and commented out all other unrelated code: int main() { SampleClass2 sc2; SamplePrivate::Call(sc2); } This code certainly doesn't use any of the code you mentioned. It only uses TAG_PRIVATE_MEMBER macro, which in turn uses TagBase and PrivateFunctionExtractor structs, and no other code. The behavior is as follows: * without -fstack-protector-strong, with or without any of the sanitize options the code runs normally. No crash, and not any messages from any of the sanitizers. * with -fstack-protector-strong, with or without -fsanitize=undefined, you got a segmentation fault. Logs when running with -fsanitize=undefined: /home/hedayat/Projects/powerfake/powerfake.h:257:40: runtime error: load of misaligned address 0x7f64004083fc for type '<unknown> *', which requires 8 byte alignment 0x7f64004083fc: note: pointer points here <memory cannot be printed> zsh: segmentation fault (core dumped) ./sample/samples * with -fstack-protector-strong and with -fsanitize=address, you don't get a crash, so -fsanitizer=address somehow fixes the problem caused with -fstack-protector-strong. (Using address sanitizer only causes a crash when I use OverloadedPrivateFloat::Call(sc2, 5);, which I will investigate. But that issue seems completely unrelated to this bug. address sanitizer causes a crash with that function even when -fstack-protector-strong is not used).
