On Mon, Jul 21, 2025 at 02:27:45PM +0000, Karthik Nayak wrote: > > Applying this ancient patch: > > > > https://lore.kernel.org/git/20171004101932.pai6wzcv2eohsicr@xxxxxxxxxxxxxxxxxxxxx/ > > > > and building with "make SANITIZE=memory CC=clang" let me run t6302 to > > completion, modulo the bug that started this thread (and which I > > confirmed goes away both with MSan and valgrind with the fix Karthik > > posted). > [...] > > I wonder if an alternate is to use '-fsanitize-ignorelist', since the > MemorySanitizer is supposed to work with that too [1]. I think you could do that, but it isn't quite what we want: it is annotating the access of those (false-positive) "uninitialized" bytes. So you have to mark every spot that touches bytes that come from zlib, which in Git is a lot of places. And so the patch linked above was an attempt to silence all of those with a single line: marking the bytes coming out of zlib as OK. -Peff
