debug: test failure due to mysterious --only-same-user error

[hyangah]

https://source.cloud.google.com/results/invocations/d3808fb7-cb92-473d-b3ed-db9f6854ad08/targets/golang%2Fvscode-go%2Fgcp_ubuntu%2Fpresubmit/log

      1) should stop on runtime error during next

should stop on runtime error during next FAILED: DAP Trace

>> accepted connection from client
-> server: {"type":"request","seq":1,"command":"initialize","arguments":{"adapterID":"go","linesStartAt1":true,"columnsStartAt1":true,"pathFormat":"path"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"DAP server listening at: 127.0.0.1:40535\n2021-06-09T02:26:51Z debug layer=dap DAP server pid = 12574\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"stderr","output":"2021/06/09 02:26:51 sameuser_linux.go:114: closing connection from different user (127.0.0.1:52544): connections to localhost are only accepted from the same UNIX user for security reasons\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"2021-06-09T02:26:51Z error layer=dap Error accepting client connection: Only connections from the same user that started this instance of Delve are allowed to connect. See --only-same-user.\n2021-06-09T02:26:51Z debug layer=dap DAP server stopping...\n2021-06-09T02:26:51Z debug layer=dap DAP server stopped\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"connection error: Error: read ECONNRESET\n"}}
<- server: {"seq":0,"type":"event","event":"terminated"}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"dlv dap (12574) exited with code: 0\n"}}
    disconnect
    ```
    
    Puzzled that how --only-same-user check causes failure only in this test. 

[hyangah]

go-delve/delve#2535 tries to log more info, but I am not sure if the logging can be helpful.
If this happens frequently, I think we can disable the same user check in our testing.

[polinasok]

I got this error with my pending CL with the new logging:
https://github.com/golang/vscode-go/runs/3141270564?check_suite_focus=true

1) should stop on runtime error during next

should stop on runtime error during next FAILED: DAP Trace

>> accepted connection from client
-> server: {"type":"request","seq":1,"command":"initialize","arguments":{"adapterID":"go","linesStartAt1":true,"columnsStartAt1":true,"pathFormat":"path"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"DAP server listening at: 127.0.0.1:46011\n2021-07-23T07:06:24Z debug layer=dap DAP server pid = 14521\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"stderr","output":"2021/07/23 07:06:24 sameuser_linux.go:62: connection from different user (remote: 0, local: 1001) detected:   60: 0100007F:DD82 0100007F:962D 06 00000000:00000000 03:00000133 00000000     0        0 0 3 0000000000000000                                      \n2021/07/23 07:06:24 sameuser_linux.go:119: closing connection from different user (127.0.0.1:56706): connections to localhost are only accepted from the same UNIX user for security reasons\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"2021-07-23T07:06:24Z error layer=dap Error accepting client connection: Only connections from the same user that started this instance of Delve are allowed to connect. See --only-same-user.\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"2021-07-23T07:06:24Z debug layer=dap DAP server stopping...\n2021-07-23T07:06:24Z debug layer=dap DAP server stopped\n"}}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"connection error: Error: read ECONNRESET\n"}}
<- server: {"seq":0,"type":"event","event":"terminated"}
<- server: {"seq":0,"type":"event","event":"output","body":{"category":"console","output":"dlv dap (14521) exited with code: 0\n"}}

[hyangah]

Thanks!

2021/07/23 07:06:24 sameuser_linux.go:62: connection from different user (remote: 0, local: 1001) detected:   
    60: 0100007F:DD82 0100007F:962D 06 00000000:00000000 03:00000133 00000000     0        0 0 3 0000000000000000   
2021/07/23 07:06:24 sameuser_linux.go:119: closing connection from different user (127.0.0.1:56706): 
    connections to localhost are only accepted from the same UNIX user for security reasons

I don't know how uid is 0. If failure is frequent enough, disabling the same user check in the test is an option.