debugging hangs with no error message #473

jgimenez · 2016-09-12T16:58:20Z

Could be related to #240 but since a long time has passed since then, could also be a new issue.

When I press the "play" button a progress indication appears but nothing happens.

I'm working with:

Visual Studio Code Version 1.5.1 (1.5.1)
Go extension 0.6.43
go version go1.6.2 darwin/amd64
Delve Debugger Version: 0.11.0-alpha Build: v0.11.0

I can confirm running dlv debug, then continue on my console works.

I can not say it's a regression, since this is the first time I try it in this machine.

If I type anything in the debug console, an error message appears:

TypeError: Cannot read property 'currentGoroutine' of null\n    at GoDebugSession.evaluateRequest (/Users/gimix/.vscode/extensions/lukehoban.Go-0.6.43/out/src/debugAdapter/goDebug.js:595:45)\n    at GoDebugSession.DebugSession.dispatchRequest (/Users/gimix/.vscode/extensions/lukehoban.Go-0.6.43/node_modules/vscode-debugadapter/lib/debugSession.js:354:22)\n    at GoDebugSession.ProtocolServer._handleData (/Users/gimix/.vscode/extensions/lukehoban.Go-0.6.43/node_modules/vscode-debugadapter/lib/protocol.js:78:38)\n    at Socket.<anonymous> (/Users/gimix/.vscode/extensions/lukehoban.Go-0.6.43/node_modules/vscode-debugadapter/lib/protocol.js:23:60)\n    at emitOne (events.js:90:13)\n    at Socket.emit (events.js:182:7)\n    at readableAddChunk (_stream_readable.js:153:18)\n    at Socket.Readable.push (_stream_readable.js:111:10)\n    at Pipe.onread (net.js:531:20)

The text was updated successfully, but these errors were encountered:

svanas · 2016-12-16T16:06:44Z

I seem to have the same problem. I'm working with:

Visual Studio Code 1.8.0
Go extension 0.6.51
go version go1.7.3 darwin/amd64
Delve 0.11.0-alpha

Every so often, nexting (F10) in de IDE hangs. I then see this in the debug console:

TypeError: Cannot read property 'currentGoroutine' of null
    at GoDebugSession.evaluateRequest (/Users/svanas/.vscode/extensions/lukehoban.Go-0.6.51/out/src/debugAdapter/goDebug.js:595:45)
    at GoDebugSession.DebugSession.dispatchRequest (/Users/svanas/.vscode/extensions/lukehoban.Go-0.6.51/node_modules/vscode-debugadapter/lib/debugSession.js:424:22)
    at GoDebugSession.ProtocolServer._handleData (/Users/svanas/.vscode/extensions/lukehoban.Go-0.6.51/node_modules/vscode-debugadapter/lib/protocol.js:104:38)
    at Socket.<anonymous> (/Users/svanas/.vscode/extensions/lukehoban.Go-0.6.51/node_modules/vscode-debugadapter/lib/protocol.js:24:60)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at Pipe.onread (net.js:543:20)

ramya-rao-a · 2017-01-11T22:26:49Z

@roblourens Could you take a look at this?

roblourens · 2017-01-11T22:42:48Z

This would imply that Delve returned a state of null when telling it to step. I'm not sure why that would happen. @ramya-rao-a I could add a null check, in case it's an error that can be recovered from?

roblourens · 2017-01-11T22:51:40Z

"evaluateRequest" is in the callstack, which implies that you either have a watch, or you typed something in the console. Did you do one of those?

Separate issue but I noticed that evaluateRequest assumes that you have hit a breakpoint when it's run, and it errors if you have a watch or eval something in the console before the first time a breakpoint is hit. We could do something about that.

svanas · 2017-01-13T10:18:59Z

"evaluateRequest" is in the callstack, which implies that you either have a watch, or you typed something in the console. Did you do one of those?

@roblourens No, but VSCode does watch all local variables in a VARIABLES panel -- could that be related to this problem?

roblourens · 2017-01-13T18:25:14Z

It doesn't send an evaluateRequest for that, so I'm not sure where else it would have come from.

svanas · 2017-01-14T07:17:01Z

@roblourens could command-line arguments be related to that, maybe? I get the impression a CLI-with-command-line-args is making nexting (F10) more unstable than a debug session without them.

cyc115 · 2017-05-31T19:17:10Z

Same error occurred for me
Visual Studio Code 1.12.2
Go extension 0.6.61
go version go1.8.3 darwin/amd64
Delve 1.0.0-rc.1

2017/05/31 14:12:37 server.go:73: Using API v1
2017/05/31 14:12:37 debugger.go:97: launching process with args: [./debug.test -test.v -test.run TestKeyRotation]
API server listening at: 127.0.0.1:2345
2017/05/31 14:12:39 debugger.go:505: continuing
=== RUN   TestKeyRotation
continue
TypeError: Cannot read property 'currentGoroutine' of null
    at GoDebugSession.evaluateRequest (/Users/xjqw46/.vscode/extensions/lukehoban.go-0.6.61/out/src/debugAdapter/goDebug.js:681:45)
    at GoDebugSession.DebugSession.dispatchRequest (/Users/xjqw46/.vscode/extensions/lukehoban.go-0.6.61/node_modules/vscode-debugadapter/lib/debugSession.js:430:22)
    at GoDebugSession.ProtocolServer._handleData (/Users/xjqw46/.vscode/extensions/lukehoban.go-0.6.61/node_modules/vscode-debugadapter/lib/protocol.js:104:38)
    at Socket.<anonymous> (/Users/xjqw46/.vscode/extensions/lukehoban.go-0.6.61/node_modules/vscode-debugadapter/lib/protocol.js:24:60)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at Pipe.onread (net.js:551:20)

ramya-rao-a · 2017-06-01T04:15:02Z

@derekparker Looks like delve is sending null state when the next command is executed. How do you suggest editors treat null state from delve. Can this be a bug in delve?

ramya-rao-a · 2017-06-01T04:15:49Z

@cyc115 If you are able to repro consistently, then can you try to use delve from the command line and share if that works?

cyc115 · 2017-06-01T14:28:23Z

@ramya-rao-a it indeed does

➜  dlv test
Type 'help' for list of commands.
(dlv) break main.main
Breakpoint 1 set at 0x1673fa3 for main.main() xxxx.go:220
(dlv)

cyc115 · 2017-06-01T19:46:54Z

@ramya-rao-a Any idea how this bug can be bypassed at least for now? :)

ramya-rao-a · 2017-06-02T00:41:00Z

Does next work as well in command line delve?

The thing is we are getting null state from delve and so the issue. We would be in a better state to fix this if we know why delve does so

cyc115 · 2017-06-05T19:28:34Z

@ramya-rao-a yes next and c works.

ramya-rao-a · 2017-06-05T22:19:20Z

Can you share a sample code where this repress consistently?

cyc115 · 2017-06-05T22:34:56Z

@ramya-rao-a The docker/notary project seems to be failing.

ahmedjafri · 2017-06-08T04:49:14Z

@ramya-rao-a Here is an example: https://github.com/willseward/delve-crash which I cannot debug from VsCode but I can with the command dlv connect 127.0.0.1:2345 and then using the dlv command line.

/var/folders/gm/fb6sb_5n6s19dyjpvqtmq_jh0000gn/T/vscode-go-debug.txt
10:06:03 PM, 6/7/2017
InitializeRequest
InitializeResponse
InitializeEvent
ConfigurationDoneRequest
ContinueRequest
ContinueResponse
ThreadsRequest

VSCode 1.12.2
vscode-go 0.6.61 (also tried building extension from HEAD - same issue)
delve 1.0.0-rc.1

#941, #360

ramya-rao-a · 2017-06-08T05:08:08Z

@ahmedjafri I am using the same version of VS Code, the Go extension and delve as you

I did a go get -u github.com/willseward/delve-crash/app
opened the app folder in VS Code, opened main.go
Added breakpoint in the fmt.Println line
Hit F5

I am able to hit the breakpoint, step in/out/next etc.

Are you on Mac, linux or Windows?

ahmedjafri · 2017-06-08T05:37:02Z

@ramya-rao-a I'm on OSX 10.11.6. Is this remote debugging?

I cloned https://github.com/willseward/delve-crash and launched the docker container with docker-compose up --build at the root of the repo

cyc115 · 2017-06-08T18:54:47Z

Local debugging on https://github.com/willseward/delve-crash does not work either:

ramya-rao-a · 2017-06-08T19:32:42Z

@ahmedjafri Not remote debugging, I tried local.

@cyc115 Can you set showLog to true and try again? This will show logs from delve in the debug console. Maybe that can help us in figuring out why delve is returning null`

ahmedjafri · 2017-06-08T22:55:35Z

As a point of reference, I can debug locally if I set a breakpoint initially and launch the debug session from vscode. After I hit the first breakpoint, I remove that breakpoint and hit continue. If I try to set that breakpoint again, it becomes unverified.

vscode-go-debug.txt

ramya-rao-a · 2017-06-08T23:59:48Z

@ahmedjafri I can repro that.

The delve call here https://github.com/Microsoft/vscode-go/blob/master/src/debugAdapter/goDebug.ts#L510 doesnt seem to be returning at all.

Nothing after https://github.com/Microsoft/vscode-go/blob/master/src/debugAdapter/goDebug.ts#L508 gets printed to the logs.

Can you try the same with command line delve and see what you get?

Start delve
set breakpoint
remove breakpoint
let the program run for a while and add breakpoint again

ahmedjafri · 2017-06-09T02:01:51Z

Working as expected through dlv command line

[ajafri:~/external/delve-crash]$ dlv debug app/main.go
Type 'help' for list of commands.
(dlv) break main.go:13
Breakpoint 1 set at 0x2145 for main.main() ./app/main.go:13
(dlv) continue
> main.main() ./app/main.go:13 (hits goroutine(1):1 total:1) (PC: 0x2145)
     8:	func main() {
     9:	        ticker := time.NewTicker(time.Second)
    10:	        defer ticker.Stop()
    11:
    12:	        for _ = range ticker.C {
=>  13:	                fmt.Println("Hello! I'm going to sleep for 1 second.")
    14:	                time.Sleep(time.Second)
    15:	        }
    16:	}
(dlv) clear 1
Breakpoint 1 cleared at 0x2145 for main.main() ./app/main.go:13
(dlv) continue
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
received SIGINT, stopping process (will not forward signal)> runtime.mach_semaphore_timedwait() /usr/local/go/src/runtime/sys_darwin_amd64.s:428 (PC: 0x52e13)
   423:		MOVL	sema+0(FP), DI
   424:		MOVL	sec+4(FP), SI
   425:		MOVL	nsec+8(FP), DX
   426:		MOVL	$(0x1000000+38), AX	// semaphore_timedwait_trap
   427:		SYSCALL
=> 428:		MOVL	AX, ret+16(FP)
   429:		RET
   430:
   431:	// func mach_semaphore_signal(sema uint32) int32
   432:	TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0
   433:		MOVL	sema+0(FP), DI
(dlv) break main.go:13
Breakpoint 2 set at 0x2145 for main.main() ./app/main.go:13
(dlv) continue
> main.main() ./app/main.go:13 (hits goroutine(1):1 total:1) (PC: 0x2145)
     8:	func main() {
     9:	        ticker := time.NewTicker(time.Second)
    10:	        defer ticker.Stop()
    11:
    12:	        for _ = range ticker.C {
=>  13:	                fmt.Println("Hello! I'm going to sleep for 1 second.")
    14:	                time.Sleep(time.Second)
    15:	        }
    16:	}
(dlv) clear 2
Breakpoint 2 cleared at 0x2145 for main.main() ./app/main.go:13
(dlv) continue
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
Hello! I'm going to sleep for 1 second.
received SIGINT, stopping process (will not forward signal)> runtime.mach_semaphore_timedwait() /usr/local/go/src/runtime/sys_darwin_amd64.s:428 (PC: 0x52e13)
   423:		MOVL	sema+0(FP), DI
   424:		MOVL	sec+4(FP), SI
   425:		MOVL	nsec+8(FP), DX
   426:		MOVL	$(0x1000000+38), AX	// semaphore_timedwait_trap
   427:		SYSCALL
=> 428:		MOVL	AX, ret+16(FP)
   429:		RET
   430:
   431:	// func mach_semaphore_signal(sema uint32) int32
   432:	TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0
   433:		MOVL	sema+0(FP), DI
(dlv) ^C
(dlv) exit

ramya-rao-a · 2017-06-09T15:09:27Z

That was very helpful @ahmedjafri Thanks! I can repro the exact same thing

received SIGINT, stopping process (will not forward signal)

I am guessing you did a ctrl+c at this point.

Looking at the steps followed by the debugger, this is what is missing I believe.
I wonder if our debugger is failing to interrupt the running process and ask to set a breakpoint

@roblourens Does that make sense? ( I might be way off here)

roblourens · 2017-06-09T21:02:58Z

Yes, I think in general we don't handle setting BPs while the process is active very well. The solution might be that when a breakpoint is set and Delve isn't paused, we send a SIGINT first, set the bps, and continue. Would have to experiment to say for sure.

ahmedjafri · 2017-06-09T22:09:33Z

@ramya-rao-a

received SIGINT, stopping process (will not forward signal)

Yep that is me hitting ctrl+c

byron70 · 2017-07-21T22:46:48Z

I am having this exact issue when I have any parameters in the "buildFlags" the the launch.json.

    "version": "0.2.0",
    "configurations": [
        {
            "stopOnEntry": false,
            "name": "test account",
            "type": "go",
            "request": "launch",
            "mode": "test",
            "cwd": "${workspaceRoot}/lib/ssm/account",
            "program": "${workspaceRoot}/lib/ssm/account",
            "args": [
                "-test.v",
                "-test.run",
                "TestCreate"
            ],
            "buildFlags": "-x -v -tags 'unit'",
            "port": 2345,
            "host": "127.0.0.1",
            "trace": "verbose",
            "showLog": true
        }
    ]
}

After banging on this for some time, I found increasing the pause in the following line to something like 500+ ms before the RPC connection attempt seems to alleviate the issue and things continue as expected.

https://github.com/Microsoft/vscode-go/blob/0.6.62/src/debugAdapter/goDebug.ts#L296

If I remove the buildFlags from the launch configuration things work just fine. The code doesn't have to build in that instance. The code is fairly simple and compiles fairly quickly.

Here is a dump of a trace with the build flags. I've removed some things for privacy sake.

Verbose logs are written to:
C:\Users\mannb\AppData\Local\Temp\vscode-go-debug.txt
3:29:28 PM, 7/21/2017
InitializeRequest
InitializeResponse
Using dlv at: D:\projects\cdn\go\bin\dlv.exe
["test","--headless=true","--listen=127.0.0.1:2345"]
WORK=C:\Users\mannb\AppData\Local\Temp\go-build948495966
mkdir -p $WORK\{....}\lib\ssm\account\_test\{....}\lib\ssm\
mkdir -p $WORK\{....}\lib\ssm\account\_test\_obj_test\
cd D:\projects\cdn\go\src\{....}\lib\ssm\account
"D:\\Go\\pkg\\tool\\windows_amd64\\compile.exe" -o "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test\\{....}lib\\ssm\\account.a" -trimpath "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966" -N -l -p {....}/lib/ssm/account -complete -buildid 172609513b0df491632e99722f5926d2bbdf0a62 -D _/D_/projects/cdn/go/src/{....}/lib/ssm/account -I "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966" -I "D:\\projects\\cdn\\go\\pkg\\windows_amd64" -pack "D:\\projects\\cdn\\go\\src\\{....}lib\\ssm\\account\\account.go" "D:\\projects\\cdn\\go\\src\\{....}lib\\ssm\\account\\account_test.go"
mkdir -p $WORK\{....}\lib\ssm\account\_test\
cd $WORK\{....}\lib\ssm\account\_test
"D:\\Go\\pkg\\tool\\windows_amd64\\compile.exe" -o "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test\\main.a" -trimpath "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966" -N -l -p main -complete -D "" -I "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test" -I "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966" -pack "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test\\_testmain.go"
cd .
"D:\\Go\\pkg\\tool\\windows_amd64\\link.exe" -o "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test\\account.test.exe" -L "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test" -L "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966" -L "D:\\projects\\cdn\\go\\pkg\\windows_amd64" -extld=gcc -buildmode=exe "C:\\Users\\mannb\\AppData\\Local\\Temp\\go-build948495966\\{....}lib\\ssm\\account\\_test\\main.a"
mkdir -p d:\projects\cdn\go\src\{....}\lib\ssm\account\
cp $WORK\{....}\lib\ssm\account\_test\account.test.exe d:\projects\cdn\go\src\{....}\lib\ssm\account\debug.test
2017/07/21 15:29:30 server.go:73: Using API v1
2017/07/21 15:29:30 debugger.go:97: launching process with args: [./debug.test -test.v -test.run TestCreate]
API server listening at: 127.0.0.1:2345

This is where things stop. If I hit enter 2 times on the debug console, I receive the following. Also, if I don't hit enter a couple of times, Ctl+Shift+F5 (debug restart) won't work... but a debug stop does.

Please start a debug session to evaluate
TypeError: Cannot read property 'currentGoroutine' of null
    at GoDebugSession.evaluateRequest (C:\Users\mannb\.vscode\extensions\lukehoban.go-0.6.62\out\src\debugAdapter\goDebug.js:669:45)
    at GoDebugSession.DebugSession.dispatchRequest (C:\Users\mannb\.vscode\extensions\lukehoban.go-0.6.62\node_modules\vscode-debugadapter\lib\debugSession.js:430:22)
    at GoDebugSession.ProtocolServer._handleData (C:\Users\mannb\.vscode\extensions\lukehoban.go-0.6.62\node_modules\vscode-debugadapter\lib\protocol.js:104:38)
    at Socket.<anonymous> (C:\Users\mannb\.vscode\extensions\lukehoban.go-0.6.62\node_modules\vscode-debugadapter\lib\protocol.js:24:60)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at Pipe.onread (net.js:551:20)
EvaluateRequest

byron70 · 2017-07-21T22:57:19Z

Guess I should note for anyone wanting to test this possible fix locally. For Windows just update that line in your local file... probably here for Windows. Linux might have a similar path.

%USERPROFILE%\.vscode\extensions\lukehoban.go-0.6.62\out\src\debugAdapter\goDebug.js

ramya-rao-a · 2017-07-24T04:53:11Z

@byron70 Yours is a different issue in that you want to increase the time before the connecting so that there is enough time for build.

cc @roblourens for increasing the time interval int he setTimeout

This current issue on the other hand is about the ability to add breakpoints when the Go program is already running.

roblourens · 2017-07-24T17:24:27Z

Other debug adapters allow you to override the timeout, and it would be easy to do that (I don't know whether there's a smarter way to detect when the build is complete)

EdwinCloud101 · 2017-09-30T03:41:49Z

I'm having the same issue running from VS Code running a simple hello world using fmt.Scanf

primalmotion · 2017-10-07T01:18:01Z

I think this is an issue with delve. I opened a reduction here derekparker/delve#982

It seems the headless rpc server get stuck for some reason. I've noticed that you can send various commands, they leave VSCode without problem and never get any response back. Then if you brutally kill the debugger, you see one error in the VSCode debug console about "connection closed" or something for each command that never got response.

ramya-rao-a · 2017-11-27T22:39:11Z

Multiple issues are being talked abt here, I'll try to address them here

Cannot debug programs that need user input. For example: The use of fmt.Scanf. This issue is being tracked in Cannot debug programs which read from STDIN #219. @edwinprojects This is what you brought up.
Debug issues when passing -v in the buildFlags or -test.v in the args. This is fixed in the latest update to the Go extension (0.6.69) via Delay connecting to dlv until it's listening #1354. @byron70 This is what you brought up and tried to fix by extending the timeout. @cyc115 This is also what you brought up.
Cannot add breakpoints when the program is not paused. This is an issue with delve itself and cannot be supported at the moment. @ahmedjafri This is what you brought up

@jgimenez @svanas I dont have the details if you used -v in the buildflags or -test.v in the args. If you did, then the latest update to the Go extension has the fix. If you didnt, and can still repro this issue, please log a new issue.

All,
I am locking this thread as it is getting hard to maintain the different threads in a single issue.
Feel free to log a new issue.

inputusernamehere mentioned this issue Oct 12, 2016

Debugger pauses/hangs on call to external library (go-sqlite3) #524

Closed

svanas mentioned this issue Dec 16, 2016

Cannot read property 'currentGoroutine' #675

Closed

ramya-rao-a added the debug label Jan 11, 2017

ramya-rao-a assigned roblourens Jan 11, 2017

realityexists mentioned this issue Jul 12, 2017

Program hangs at start on "Start Without Debugging" #1084

Closed

DMarby mentioned this issue Nov 19, 2017

Delay connecting to dlv until it's listening #1354

Merged

ramya-rao-a closed this as completed Nov 27, 2017

microsoft locked and limited conversation to collaborators Nov 27, 2017

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debugging hangs with no error message #473

debugging hangs with no error message #473

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debugging hangs with no error message #473

debugging hangs with no error message #473

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