Maxima branch_5_37_base_407_g2af0c38 http://maxima.sourceforge.net using Lisp GNU Common Lisp (GCL) GCL 2.6.12 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) integrate(cos(x/atan(x)),x); Maxima encountered a Lisp error: Condition in MACSYMA-TOP-LEVEL [or a callee]: INTERNAL-SIMPLE-ERROR: Caught fatal error [memory may be damaged] Automatically continuing. To enable the Lisp debugger set *debugger-hook* to nil.
Still present in current post-5.46. GCL gives the above error; SBCL gives the slightly more informative
A backtrace shows the error is in the Risch code, specifically RISCHEXPLOG; I don't know if that's a bug in that function, or one of its callers.