fpc Pascal Runtime error 216 before execution ends - runtime-error

Question

I was implementing adjacency list in Pascal (by first reading edge end points, and then using dynamic arrays to assign required amount of memory to edgelist of each node). The program executes fine, gives correct outputs but gives runtime error 216 just before exiting.
The code is :
type aptr = array of longint;
var edgebuf:array[1..200000,1..2] of longint;
ptrs:array[1..100000] of longint;
i,j,n,m:longint;
elist:array[1..100000] of aptr;
{main}
begin
readln(n,m);
fillchar(ptrs,sizeof(ptrs),#0);
for i:=1 to m do begin
readln(edgebuf[i][1],edgebuf[i][2]);
inc(ptrs[edgebuf[i][1]]);
end;
for i:=1 to n do begin
setlength(elist[i],ptrs[i]);
end;
fillchar(ptrs,sizeof(ptrs),#0);
for i:=1 to m do begin
inc(ptrs[edgebuf[i][1]]);
elist[edgebuf[i][1]][ptrs[edgebuf[i][1]]]:=edgebuf[i][2];
end;
for i:=1 to n do begin
writeln(i,' begins');
for j:=1 to ptrs[i] do begin
write(j,' ',elist[i][j],' ');
end;
writeln();
writeln(i,' ends');
end;
writeln('bye');
end.
When run on file
4 5
1 2
3 2
4 3
2 1
2 3
gives output:
1 begins
1 2
1 ends
2 begins
1 1 2 3
2 ends
3 begins
1 2
3 ends
4 begins
1 3
4 ends
bye
Runtime error 216 at $0000000000416644
$0000000000416644
$00000000004138FB
$0000000000413740
$0000000000400645
$00000000004145D2
$0000000000400180
Once the program says "bye", what is the program executing that is giving runtime error 216?

Answer 1

RTE 216 is in general fatal exceptions. GPF/SIGSEGV and in some cases SIGILL/SIGBUS, and that probably means that your program corrupts memory somewhere.
Compile with runtime checks on might help you find errors (Free Pascal : -Criot )