https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96304
Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marxin at gcc dot gnu.org --- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> --- > But, are we violating aliasing rules here? What am I missing? Likely you are, but I must admit it's sometimes quite difficult to find that. >From quickly looking at the function, you may violate it here: MemJournal *p = (MemJournal*)pJfd; maybe MemJournal *p = (MemJournal*)(char*)pJfd; can solve it. Unfortunately I can't reproduce it on my x86_64-linux box.