[Bug c++/98206] UBSan: Casting from multiple inheritance base to derived class triggers undefined behavior sanitizer

[rbock at eudoxos dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98206

--- Comment #1 from Roland B <rbock at eudoxos dot de> ---
Here is the actual error message:


// -----
example.cpp:16:49: runtime error: reference binding to misaligned address
0x7ffdc34cab61 for type 'const struct X', which requires 8 byte alignment
0x7ffdc34cab61: note: pointer points here
 00 00 00  02 00 00 00 00 00 00 00  0a 00 00 00 00 00 00 00  af 20 40 00 00 00
00 00  20 17 40 00 00
              ^ 
// -----

This is referring to 

return static_cast<const Derived&>(*this);