[Bug 1930920] [NEW] gdb crashes connecting to remote session in layout split

[Donovan Allen]

Public bug reported:

release:
Description:    Ubuntu 20.04.2 LTS                                                                                                                                                                               
Release:        20.04 

gdb:
  Installed: 9.2-0ubuntu1~20.04
  Candidate: 9.2-0ubuntu1~20.04
  Version table:
 *** 9.2-0ubuntu1~20.04 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     9.1-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

GDB crashes when attempting to connect to a remote session while in
`layout split`. If I connect to the remote session first it works,
however if I already changed my view I get a core dump.

My steps to reproduce crash:
 - Run iso using `qemu-system-i386 -cdrom MyIso.iso -gdb tcp::26000 -S -monitor stdio`
 - open gdb in seperate tab
 - run `layout split`
 - run `target remote localhost:26000`
 - Crash

I was previously able to do this without crash using:
release:
Description:    Ubuntu 18.04.5 LTS                                                                                                                                                                               
Release:        18.04 

gdb:
  Installed: 8.1.1-0ubuntu1
  Candidate: 8.1.1-0ubuntu1
  Version table:
 *** 8.1.1-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     8.1-0ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

** Affects: gdb (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1930920

Title:
  gdb crashes connecting to remote session in layout split

Status in gdb package in Ubuntu:
  New

Bug description:
  release:
  Description:    Ubuntu 20.04.2 LTS                                                                                                                                                                               
  Release:        20.04 

  gdb:
    Installed: 9.2-0ubuntu1~20.04
    Candidate: 9.2-0ubuntu1~20.04
    Version table:
   *** 9.2-0ubuntu1~20.04 500
          500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       9.1-0ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

  GDB crashes when attempting to connect to a remote session while in
  `layout split`. If I connect to the remote session first it works,
  however if I already changed my view I get a core dump.

  My steps to reproduce crash:
   - Run iso using `qemu-system-i386 -cdrom MyIso.iso -gdb tcp::26000 -S -monitor stdio`
   - open gdb in seperate tab
   - run `layout split`
   - run `target remote localhost:26000`
   - Crash

  I was previously able to do this without crash using:
  release:
  Description:    Ubuntu 18.04.5 LTS                                                                                                                                                                               
  Release:        18.04 

  gdb:
    Installed: 8.1.1-0ubuntu1
    Candidate: 8.1.1-0ubuntu1
    Version table:
   *** 8.1.1-0ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       8.1-0ubuntu3 500
          500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

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