Crashing in maxima 5.13.0 on Debian amd64

I am playing around with my simulated annealing code and getting a 
highly reproducible crash on my machine when I execute the following 
code. The simulation runs for a while and then hangs. Maxima uses up 700 
  MB of virtual memory or so and then pegs the CPU. I don't see where 
i'm initiating an infinite loop or anything. and if I use a smaller 
number of iterations, i don't get the hang....

This is the stock Debian 5.13.0-2 (slightly older package than current 
debian unstable which is 5.13.0-3 the dash numbers are the version of 
the package. )

Can anyone confirm this hang on another machine?


---code below---


kill(all);

load("distrib");


minimize_sa(funname,vars,init,scales,maxiters,t0) :=

block([curval:ev(funname,map("=",vars,init)),
   bestval:0,
   bestpos:init, curpos:init, temp:t0,
   tempfactor:1/100^(1/maxiters)
   ],
   bestval:curval,
   for i:1 thru maxiters do
   block([nextval:curval,
     nextpos:curpos + 
map(random_normal,makelist(0,i,1,length(vars)),scales),
     randnum:random(1.0)],
     (nextval:ev(funname,map("=",vars,nextpos)),
       print(nextval, " at ",nextpos),
       if(nextval < curval or randnum < exp(-(nextval-curval)/temp))
       then
       (curpos:nextpos, curval:nextval,
         if(nextval < bestval) then
         (bestpos:nextpos,bestval:nextval)),
       temp:temp*tempfactor)),
   map("=",vars,bestpos));

minimize_sa(x^2+y^2,[x,y],[1,3],[.2,.2],200,1);