Hello Ludovic and David, thanks for all the comments on the smob freeing callbacks. Apparently I misread the documentation so the bug was introduced. I've changed the callback procedures as was suggested; the patches included in Guile-SSH version 0.10.1 released a few moments ago. - Artyom -- Artyom V. Poptsov ; GPG Key: 0898A02F Home page: http://poptsov-artyom.narod.ru/