On Thu, Jan 22, 2026 at 12:14 PM John Naylor <[email protected]> wrote: > > On Thu, Jan 22, 2026 at 3:00 AM Alexander Lakhin <[email protected]> wrote: > > Unfortunately, no -- I still got: > > heaptoast.c:771:17: runtime error: addition of unsigned offset to > > 0x78120673fac6 overflowed to 0x78120673fa04 > > SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior heaptoast.c:771:17 > > Okay, I'll refrain from guessing more then. I'm due for an OS upgrade > anyway, and that'll have clang 21, so I'll come back to this one > unless someone beats me to it.
Small update: With clang 21 I've confirmed the behavior Alexander found, and confirmed my v1 patches fix the warnings except for the one in heap_fetch_toast_slice() that I skipped over. I'd like to understand that one better, in case a more principled fix can be found. -- John Naylor Amazon Web Services
