panic when delve process is stopped

[bo-er]

1. What version of Delve are you using (dlv version)?

[root@62-62-udp-5 opt]# dlv version
Delve Debugger
Version: 1.20.1
Build: $Id: 96e65b6c615845d42e0e31d903f6475b0e4ece6e $
[root@62-62-udp-5 opt]#

2. What version of Go are you using? (go version)?
   irrelevant since the program has been compiled and was downloaded from release page of delve.
3. What operating system and processor architecture are you using?

CentOS Linux release 7.2.1511 (Core)
Linux 62-62-udp-5 3.10.0-862.14.4.el7.x86_64 #1 SMP Wed Sep 26 15:12:11 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

5. What did you do?
   Stopping delve
6. What did you expect to see?

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0x7fdcb8]

goroutine 1 [running]:
github.com/go-delve/delve/service/debugger.(*Debugger).Command(0xc000146790, 0xc000277790, 0x0)
        /root/go/pkg/mod/github.com/go-delve/delve@v1.20.1/service/debugger/debugger.go:1301 +0x1718
github.com/go-delve/delve/service/rpccommon.(*ServerImpl).Stop(0xc000122d20)
        /root/go/pkg/mod/github.com/go-delve/delve@v1.20.1/service/rpccommon/server.go:101 +0xee
github.com/go-delve/delve/cmd/dlv/cmds.execute(0x376e, {0xc000122b50, 0x0, 0x5}, 0xc00011a0e0, {0x0, 0x0}, 0x3, {0xc000122b40, 0x1, ...}, ...)
        /root/go/pkg/mod/github.com/go-delve/delve@v1.20.1/cmd/dlv/cmds/commands.go:1015 +0xea9
github.com/go-delve/delve/cmd/dlv/cmds.attachCmd(0xc0001ecc80?, {0xc000122b40?, 0x1, 0x6})
        /root/go/pkg/mod/github.com/go-delve/delve@v1.20.1/cmd/dlv/cmds/commands.go:791 +0x145
github.com/spf13/cobra.(*Command).execute(0xc0001ecc80, {0xc000122ae0, 0x6, 0x6})
        /root/go/pkg/mod/github.com/spf13/cobra@v1.1.3/command.go:856 +0x663
github.com/spf13/cobra.(*Command).ExecuteC(0xc0001eca00)
        /root/go/pkg/mod/github.com/spf13/cobra@v1.1.3/command.go:960 +0x39d
github.com/spf13/cobra.(*Command).Execute(0xaa7f00?)
        /root/go/pkg/mod/github.com/spf13/cobra@v1.1.3/command.go:897 +0x19
main.main()
        /root/go/pkg/mod/github.com/go-delve/delve@v1.20.1/cmd/dlv/main.go:24 +0x18a

Should not panic
9. What did you see instead?
delve panics

[aarzilli]

Do you have some steps to reproduce this? Does this reproduce with delve 1.22?