I can't reproduce it using v4.3.0.
It looks like this problem is FIXED.


Thanks again for submitting bug report ;-)

Ok, I've rechecked, patch from comment #4 seems to fix this so I applied it, can you check again?

I just tested this out afresh, and I'm seeing today (on commit ) the exact same thing as I did two years ago:

(gdb) frame 4
#4  0x000000000041e09f in ChangeWindowSize (p=0x22a9730, wi=180, he=70, hi=2048) at resize.c:766
766   if (ml->image[p->w_width] == ' ')
(gdb) print*ml
$1 = {
  image = 0x2020202020202020 <Address 0x2020202020202020 out of bounds>,
  attr = 0x2020202020202020 <Address 0x2020202020202020 out of bounds>,
  font = 0x2020202020202020 <Address 0x2020202020202020 out of bounds>,
  fontx = 0x2020202020202020 <Address 0x2020202020202020 out of bounds>,
  color = 0x2020202020202020 <Address 0x2020202020202020 out of bounds>
}

I should point out that this is happening on Linux x86_64; when I try the very same procedure on with a 64-bit build of screen on AIX 7.1 it does not crash.

I'll try to test this out on my 32-bit Linux laptop tomorrow to see if it's a Linux thing or a 64-bit Linux thing.

I have an idea, but I am not sure if I am not completely wrong. When is screen calculating resize it uses current cursor location, but I think that it should use the position where the cursor was before entering altscreen. I have tried this small modification and segfault is gone.

diff --git a/src/ansi.c b/src/ansi.c
index d88e153..8df79b2 100644
--- a/src/ansi.c
+++ b/src/ansi.c
@@ -1438,8 +1438,8 @@ int c, intermediate;
                    }
                  else
                    {
-                     LeaveAltScreen(curr);
                      RestoreCursor(&curr->w_alt.cursor);
+                     LeaveAltScreen(curr);
                    }
                  if (a1 == 47 && !i)
                    curr->w_saved.on = 0;

Thanks for the speedy fix, Sadrul!