From: Jeff King <peff@peff.net>
Date: Wed, 08 Apr 2026 17:39:49 GMT
Subject: Re: Git 2.54.0-rc1, subtests of t5310, t5326, t5327
Message-ID: <20260408173949.GB2850002@coredump.intra.peff.net>
In-Reply-To: <013301dcc774$5e9fffb0$1bdfff10$@nexbridge.com>

On Wed, Apr 08, 2026 at 12:25:47PM -0400, rsbecker@nexbridge.com wrote:

> This is also impacting t5608 and t7700. Anywhere where writev() is
> used, seemingly. We went through MAX_IO_SIZE issues years ago, instead
> of using ssize_t as a basis of how big communication is. I think
> writev() is not valid. It worked on Lunix, but had issues elsewhere.
> This broke the compat layer.

I wondered briefly if the problem could be that we're violating
MAX_IO_SIZE here, as our use of writev() does not respect it at all. But
the only spot that uses it is feeding pkt-line packets, which max out at
64k. So unless your MAX_IO_SIZE is smaller than that, I doubt that is
the problem.

-Peff