On Sun, Jan 15, 2023 at 12:53:25PM +0100, Christian Couder wrote: > From a very quick look, it seems that in setup_traverse_info() in > tree-walk.c we do: > > static struct traverse_info dummy; > ... > if (pathlen) > info->prev = &dummy; > > but then later in debug_path() in unpack-trees.c we check > *info->prev->name which segfaults. > > I am not very familiar with this code and don't have much time right > now, so I think I will leave it to others to investigate this further. I'm not sure if Frédéric is seeing another segfault in practice (when not using --debug-unpack), but yeah, it is very easy to trigger this segfault. It does not even have to do with sparse checkouts, etc. Here's an even more minimal example: git init repo cd repo touch file git add file git commit -m added git read-tree --debug-unpack --prefix=subtree HEAD I was going to bisect, but it looks like it was broken all the way back to Junio's ba655da537 (read-tree --debug-unpack, 2009-09-14). -Peff
