Re: Bug in 2.26: git-fetch fetching too many objects?

From: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Date: Apr 20, 2020, 17:03 UTC
Message-ID: <20200420170301.h65vkk36avnud7z3@chatter.i7.local>
In-Reply-To: <878siqxiu0.wl-ashutosh.dixit@intel.com>

On Mon, Apr 20, 2020 at 08:44:39AM -0700, Dixit, Ashutosh wrote:

Show 12 quoted lines

> I am seeing a strange behavior in git-fetch in 2.26. I frequently fetch
> from a couple of linux kernel remotes (so you will have an idea how big the
> repo is). I have a different system with 2.20 on which I never see a
> problem.
> 
> So let us say I fetch with 2.20 and it fetches say 20,000 objects. However
> with 2.26 it starts fetching millions of objects, objects which are already
> present locally. I don't know yet if this happens each time or only once in
> a while, I have seen it happen twice, will keep an eye out for this.
> 
> If you open a bug please let me know and I can update it with my
> findings. Unless it is a known issue, perhaps already fixed?

It's a known issue with protocol v2, but nobody's been able to properly reproduce it in order to debug. If you can reliably make it reoccur, then please make a copy of your local tree and share with this list, together with your gitconfig and the remote you're pulling.

Setting protocol.version=1 should fix it, but if you are willing to help troubleshoot it, a bunch of people will be super thankful to you for that, as it affects quite a number of kernel developers.

-K