Hi,

As others have noted too [0], in certain cases you cannot scroll up using the up arrow key when in the asm layout.

It seems to me that the bug manifests once the program being debugged has crashed with SIGSEGV.

Suppose a.c is a buggy program like:

```
#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char **argv)
{
    printf("%s\n", (char *)0);
    return (EXIT_SUCCESS);
}
```

Now we debug it:

```
$ gcc -g a.c
$ gdb a.out
...
(gdb) layout asm
```

Now verify that scrolling up and down both work. They do.

```
(gdb) run
Starting program: /tmp/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f5a181 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
```

Now scrolling down works, but up does not.

This is particularly acute, as you usually want to see what instructions lead to the crash.

I'm using version 9.1 but bug seems also present in 8.2.1, as distributed with debian.

Thanks

[0] https://stackoverflow.com/questions/26572805/gdb-tui-scroll-assembly-view-above-current-instruction