Hi, I found a specific bug in Gambit-C 4.2.5 that crashes with a "bus error". Here is the code to repoduce it: (define (crash) (with-exception-handler (lambda (e) (display (compute-error-message e)) (force-output)) (lambda () (+ 1 a)))) (define (compute-error-message e) (##continuation-capture (lambda (k) (string-append (call-with-output-string "" (lambda (p) (##display-exception-in-context e k p))) "\n\n" (call-with-output-string "" (lambda (p) (##cmd-b 0 k p))))))) It used to work before. The function (compute-error-message e) is used to get a verbose error message when my program crashes since it can happen in any concurrent thread. Is the ##cmd still supported? Thank you, Francois Magnan