Hi,
to reproduce the issue:
(1) start mg and press Enter, until you fill up the screen and it goes
on to the next screen.
(2) type in at least one character
(3) press M-v (or execute command scroll-down)
(4) mg core dumps.
(gdb) bt
#0 0x000016b305e0e014 in update (modelinecolor=2) at
/usr/src/usr.bin/mg/display.c:528
#1 0x000016b305e1be69 in main (argc=0, argv=0x7f7ffffd18b0) at
/usr/src/usr.bin/mg/main.c:178
It seems to me this is since r1.36 of basic.c.
At least if I comment those two added lines, it doesn't crash anymore.
But of course, this is not a fix, as that commit was supposed to fix
other issues.
Index: basic.c
===================================================================
RCS file: /cvs/src/usr.bin/mg/basic.c,v
retrieving revision 1.43
diff -u -p -r1.43 basic.c
--- basic.c 16 Nov 2014 04:16:41 -0000 1.43
+++ basic.c 18 Mar 2015 11:27:35 -0000
@@ -372,8 +372,10 @@ backpage(int f, int n)
/* Move the dot the slow way, for line nos */
while (curwp->w_dotp != lp2) {
+ /*
if (curwp->w_dotline <= curwp->w_ntrows)
return (TRUE);
+ */
curwp->w_dotp = lback(curwp->w_dotp);
curwp->w_dotline--;
}
