I updated today my packages in emacs with ELPA and after the update I'm stuck with the
Variable binding depth exceeds max-specpdl-size
error. Since it is not easy to debug, is it possible to downgrade the packages that were updated? Where can I find an ELPA log where I can get the previous version of these packages?
I second @lawlist's recommendation to (setq debug-on-error t) early in your ~/.emacs file. You can also use emacs --debug-init to get a similar result. This said, sometimes the kind of error you get here can also prevent the debugger from showing up. I recommend you M-x report-emacs-bug and describe the problem, along with any additional info you find, including the solution you found, if any.
As for downgrading a package, it's technically possible, but there is no UI support for it. And there's no log of package installs either. Please do mention this in the bug-report as well, since it's indeed a good idea to try and keep track of those things.
Sorry.
来源：https://stackoverflow.com/questions/21591061/is-it-possible-to-downgrade-packages-installed-with-elpa