Could not attach to pid:#### this could be caused by a kernel security setting, try writing "0" to /proc/sys/kernel/yama/ptrace_scope

[Anjana-Prabhakar]

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Describe the bug

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A clear and concise description of what you expected to happen.
I have a go application tendermint running which creates blocks of a blockchain. On running debug using the attach option as shown below:

 "name":"attach to process",
            "type": "go",
            "request": "attach",
            "mode": "local",
            "processId": 30834,
            "trace":"log"

i get an error Could not attach to pid:30834 this could be caused by a kernel security setting, try writing "0" to /proc/sys/kernel/yama/ptrace_scope

Steps to reproduce the behavior:

1. Run Tendermint single node application

make install
tendermint init
tendermint node --proxy_app=kvstore

2. Click on 'debug with attach'
3. See error

2020-3-13, 07:00:16.821 UTC
[07:00:16.821 UTC] From client: initialize({"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"go","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en-gb"})
[07:00:16.822 UTC] InitializeRequest
[07:00:16.822 UTC] To client: {"seq":0,"type":"response","request_seq":1,"command":"initialize","success":true,"body":{"supportsConfigurationDoneRequest":true,"supportsSetVariable":true}}
[07:00:16.822 UTC] InitializeResponse
[07:00:16.822 UTC] From client: attach({"name":"attach to process","type":"go","request":"attach","mode":"local","processId":30834,"trace":"log","packagePathToGoModPathMap":{"/home/ethereum/go/src/github.com/tendermint/tendermint/state":"/home/ethereum/go/src/github.com/tendermint/tendermint","/home/ethereum/go/src/github.com/tendermint/tendermint/node":"/home/ethereum/go/src/github.com/tendermint/tendermint","/home/ethereum/go/src/github.com/tendermint/tendermint/consensus":"/home/ethereum/go/src/github.com/tendermint/tendermint","/home/ethereum/go/src/github.com/tendermint/tendermint/.vscode":"/home/ethereum/go/src/github.com/tendermint/tendermint",".":"","/tmp":""},"env":{"GOPATH":"/home/ethereum/go","ELECTRON_RUN_AS_NODE":"1","USER":"ethereum","SSH_AGENT_PID":"2461","HOME":"/home/ethereum","QT4_IM_MODULE":"xim","GNOME_SHELL_SESSION_MODE":"ubuntu","GTK_MODULES":"gail:atk-bridge","DBUS_SESSION_BUS_ADDRESS":"unix:path=/run/user/1000/bus","PULSE_SCRIPT":"/etc/xrdp/pulse/default.pa","LOGNAME":"ethereum","GTK_IM_MODULE":"ibus","XDG_SESSION_ID":"c2","PATH":"/home/ethereum/.local/bin:/sbin:/bin:/usr/bin:/usr/local/bin:/snap/bin:/usr/local/go/bin:/usr/local/go/bin:/usr/local/go/bin:/usr/local/go/bin:/home/ethereum/go/bin:/home/ethereum/.local/bin","XRDP_SOCKET_PATH":"/var/run/xrdp/sockdir","XDG_RUNTIME_DIR":"/run/user/1000","DISPLAY":":10.0","LANG":"en_IN","XDG_CURRENT_DESKTOP":"Unity","XMODIFIERS":"@im=ibus","UID":"1000","SSH_AUTH_SOCK":"/run/user/1000/keyring/ssh","SHELL":"/bin/bash","QT_ACCESSIBILITY":"1","XRDP_SESSION":"1","GPG_AGENT_INFO":"/run/user/1000/gnupg/S.gpg-agent:0:1","QT_IM_MODULE":"xim","PWD":"/home/ethereum","XDG_DATA_DIRS":"/usr/share/gnome:/usr/share/ubuntu:/usr/local/share:/usr/share:/var/lib/snapd/desktop","XDG_CONFIG_DIRS":"/etc/xdg/xdg-ubuntu:/etc/xdg","CLUTTER_IM_MODULE":"xim","GNOME_DESKTOP_SESSION_ID":"this-is-deprecated","XDG_MENU_PREFIX":"gnome-","SESSION_MANAGER":"local/ethereum:@/tmp/.ICE-unix/2393,unix/ethereum:/tmp/.ICE-unix/2393","GIO_LAUNCHED_DESKTOP_FILE":"/usr/share/applications/code.desktop","GIO_LAUNCHED_DESKTOP_FILE_PID":"29849","GJS_DEBUG_OUTPUT":"stderr","GJS_DEBUG_TOPICS":"JS ERROR;JS LOG","NO_AT_BRIDGE":"1","CHROME_DESKTOP":"code-url-handler.desktop","VSCODE_NLS_CONFIG":"{\"locale\":\"en-gb\",\"availableLanguages\":{},\"_languagePackSupport\":true}","VSCODE_NODE_CACHED_DATA_DIR":"/home/ethereum/.config/Code/CachedData/c47d83b293181d9be64f27ff093689e8e7aed054","VSCODE_LOGS":"/home/ethereum/.config/Code/logs/20200311T163535","VSCODE_IPC_HOOK":"/run/user/1000/vscode-faaa7b3a-1.42.1-main.sock","VSCODE_PID":"29849","GL_DEBUG":"linters_output","GOPACKAGESPRINTGOLISTERRORS":"1","GOROOT":"/usr/local/go","LESSCLOSE":"/bin/lesspipe %s %s","LESSOPEN":"| /bin/lesspipe %s","LS_COLORS":"","SHLVL":"1","_":"/usr/share/code/code","AMD_ENTRYPOINT":"vs/workbench/services/extensions/node/extensionHostProcess","PIPE_LOGGING":"true","VERBOSE_LOGGING":"true","VSCODE_IPC_HOOK_EXTHOST":"/tmp/vscode-ipc-972dcaf6-f8a8-4cde-809e-d3edf9f6a5f2.sock","VSCODE_HANDLES_UNCAUGHT_ERRORS":"true","VSCODE_LOG_STACK":"false","APPLICATION_INSIGHTS_NO_DIAGNOSTIC_CHANNEL":"true","GOPROXY":"https://proxy.golang.org,direct"},"apiVersion":2,"dlvLoadConfig":{"followPointers":true,"maxVariableRecurse":1,"maxStringLen":64,"maxArrayValues":64,"maxStructFields":-1},"showGlobalVariables":true,"cwd":"/home/ethereum/go/src/github.com/tendermint/tendermint","dlvToolPath":"/home/ethereum/go/bin/dlv","currentFile":false,"__sessionId":"020b22be-94c2-4395-a521-18db82ebc783"})
[07:00:16.822 UTC] Current working directory: /home/ethereum/go/src/github.com/tendermint
[07:00:16.822 UTC] Running: /home/ethereum/go/bin/dlv attach 30834 --headless=true --listen=127.0.0.1:40048 --api-version=2 --wd=/home/ethereum/go/src/github.com/tendermint/tendermint
[07:00:16.829 UTC] To client: {"seq":0,"type":"event","event":"output","body":{"category":"stdout","output":"API server listening at: 127.0.0.1:40048\n"}}
[07:00:16.830 UTC] To client: {"seq":0,"type":"event","event":"output","body":{"category":"stderr","output":"Could not attach to pid 30834: this could be caused by a kernel security setting, try writing \"0\" to /proc/sys/kernel/yama/ptrace_scope\n"}}
[07:00:16.831 UTC] [Error] Process exiting with code: 1
[07:00:16.832 UTC] To client: {"seq":0,"type":"response","request_seq":2,"command":"attach","success":false,"message":"Failed to continue: Check the debug console for details.","body":{"error":{"id":3000,"format":"Failed to continue: Check the debug console for details.","showUser":true}}}
[07:00:16.832 UTC] Sending TerminatedEvent as delve is closed
[07:00:16.832 UTC] To client: {"seq":0,"type":"event","event":"terminated"}
[07:00:16.854 UTC] From client: disconnect({"restart":false})
[07:00:16.854 UTC] DisconnectRequest
[07:00:16.854 UTC] HaltRequest

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[hyangah]

This is because Yama blocks ptrace attach. https://www.kernel.org/doc/Documentation/security/Yama.txt

Please try to do what the error message says

Could not attach to pid:30834 this could be caused by a kernel security setting, try writing "0" to /proc/sys/kernel/yama/ptrace_scope

E.g. echo 0 > /proc/sys/kernel/yama/ptrace_scope

[hyangah]

@Anjana-Prabhakar did you manage to solve the problem?

@stamblerre @ramya-rao-a can you mark this as needs more info? Thanks!

[Anjana-Prabhakar]

I could not try it out as i was travelling when the lockdown owing to corona spread was announced and am stuck at a place with no access to my laptop. I shall revert once I get access. Thanks for the help. Get Outlook for Android<https://aka.ms/ghei36>

…

________________________________ From: Hyang-Ah Hana Kim <notifications@github.com> Sent: Friday, April 3, 2020 8:15:06 PM To: microsoft/vscode-go <vscode-go@noreply.github.com> Cc: PH2015014 Anjana Prabhakar <anjana.prabhakar@iiitb.org>; Mention <mention@noreply.github.com> Subject: Re: [microsoft/vscode-go] Could not attach to pid:#### this could be caused by a kernel security setting, try writing "0" to /proc/sys/kernel/yama/ptrace_scope (#3098) @Anjana-Prabhakar<https://github.com/Anjana-Prabhakar> did you manage to solve the problem? @stamblerre<https://github.com/stamblerre> @ramya-rao-a<https://github.com/ramya-rao-a> can you mark this as needs more info? Thanks! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#3098 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AHFXQLYM7ZCN6GIWJYQ24KLRKXY7FANCNFSM4LG4W6QA>.

[festum]

I have this same issue. tried echo 0|sudo tee /proc/sys/kernel/yama/ptrace_scope then stuck with could not attach to pid 74570: could not open debug info.

config:

{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "Attach",
			"type": "go",
			"request": "attach",
			"mode": "local",
			"processId":74570,
		}
	]
}

[hyangah]

@festum As the error message indicates, that is a different issue. Is your binary compiled with optimization disabled?
go-delve/delve#1698 (comment)

[vscodebot]

This issue has been closed automatically because it needs more information and has not had recent activity. Thank you for your contributions.