[Bug gdb/21866] New: Stepi does not make progress with memory error

["benno.fuenfstueck at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21866

            Bug ID: 21866
           Summary: Stepi does not make progress with memory error
           Product: gdb
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: benno.fuenfstueck at gmail dot com
  Target Milestone: ---

On certain programs, GDB's `stepi` command does not work anymore (neither do
`break` or any of the examine commands). Only `continue` works in this
situation):

0x080485ee in main ()
(gdb) display/i $pc
1: x/i $pc
=> 0x80485ee <main+51>: mov    DWORD PTR ds:0x804a020,0x2
(gdb) si
Cannot access memory at address 0xdeadbeeb
(gdb) si
Cannot access memory at address 0xdeadbeeb
(gdb) bt
Python Exception <class 'gdb.MemoryError'> Cannot access memory at address
0xdeadbeeb: 
#0  0x080485ee in main ()
Cannot access memory at address 0xdeadbeeb
(gdb) p/x $pc
$1 = 0x80485ee
(gdb) si
Cannot access memory at address 0xdeadbeeb
(gdb) p/x $pc
$2 = 0x80485ee
(gdb) 

Program to reproduce:
https://gist.github.com/bennofs/84b5007fe807d59bbadc13c0b6ae2849

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