search for: 20161231_121729_ebc8a

...odify the low bytes of a packet length, then ssh will time out and this will be interpreted as a test failure. I'm seeing this in practice on Ubuntu ppc64el (e.g. https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-zesty/zesty/ppc64el/o/openssh/20161231_121729_ebc8a@/log.gz). Fortunately there was already an XXX comment indicating what might be going wrong here, and although I haven't been able to reproduce it directly on a system where I can experiment interactively, I can at least reproduce it by fiddling with the start offset, which was enough to be ab...