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Unfortunately, the next command I issued was "sudo rm -rf *", which did not end well with cwd being "/" :-( My colleagues and me started to track down the bug. Our efforts are documented here: https://github.com/grml/grml-etc-core/issues/76 (We initially though it was a bug with grml zsh config.) A minimal example that triggers the bug looks like this: $ mkdir /tmp/tmp.0HnyRZ1iXv/ $ cd /tmp/tmp.0HnyRZ1iXv/ $ mkdir a $ sudo zsh -f -c 'mount -t tmpfs tmpfs a; cd a; touch x; ls; umount --lazy ../a; ls; foo=.; echo ${foo:a}; ls; realpath .; echo $PWD;' It will output the following: x # content of directory a (expected) x # content of directory a (expected) / # NOT expected bin dev ... # content of / (NOT expected) / # NOT expected /tmp/tmp.0HnyRZ1iXv/a # expected cwd silently changed to "/" while pwd does not know about this. This looks like a very specific use case, but a change [0] about how vcs_info gets the base directory for the repository also triggers this bug. In my case when using Gnome which automatically mounts and unmounts external drives (with the --lazy option). After ending up in the source code for zgetcwd() and zgetdir() we decided to hand the issue over to you :-) Regards, Yannic [0] https://github.com/zsh-users/zsh/commit/faa07d064bb2bd9cd9892a255a4b63811242b9fb -- Yannic Schröder, M.Sc. Technische Universität Braunschweig Institut für Betriebssysteme und Rechnerverbund Mühlenpfordtstr. 23 38106 Braunschweig Fon: +49 (531) 391 - 3249 Fax: +49 (531) 391 - 5936 E-Mail: schroeder@ibr.cs.tu-bs.de