cgo on win32 and dll: malloc/free - deadlock

[simonhege]

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. Compile the attached c code as a dll
2. Compile the attached go code using the dll produced during previous step
3. Run the generated executable

(see build.bat in the attached zip file)

//The code sample is the same as in issue #5273, corrected to link with dll.

What is the expected output?
[DLL] Hello from go

What do you see instead?
fatal error: malloc/free - deadlock
[signal 0xc0000005 code=0x1 addr=0x2f0 pc=0x414bf8]

goroutine 1 [syscall]:
[fp=0x25177c] return()
        C:/go/src/pkg/runtime/asm_386.s:472
[fp=0x2517a4] runtime.cgocall(0x41e053, 0x2517b0)
        C:/go/src/pkg/runtime/cgocall.c:162 +0x10a
[fp=0x2517b0] main._Cfunc_Echo(0x572fb8)
        C:/Users/SIMONH~1/AppData/Local/Temp/go-build942746867/_/E_/GoIssue/GoEc
ho/_obj/_cgo_defun.c:44 +0x31
[fp=0x2517c4] main.main()
        C:/Users/SIMONH~1/AppData/Local/Temp/go-build942746867/_/E_/GoIssue/GoEc
ho/_obj/main.cgo1.go:19 +0x55
[fp=0x2517dc] runtime.main()
        C:/go/src/pkg/runtime/proc.c:182 +0x8e
[fp=0x2517e0] runtime.goexit()
        C:/go/src/pkg/runtime/proc.c:1223

goroutine 2 [syscall]:

Which compiler are you using (5g, 6g, 8g, gccgo)?
8g

Which operating system are you using?
Windows 7/x86

Which version are you using?  (run 'go version')
go version go1.1 windows/386

(compiled from source with gcc 4.6.2)

Please provide any additional information below.
I came up to this issue with a more complex library which works fine on linux x64 (.so
library). It seems to be windows related only.

I've also tried with the curent tip version and the issue is the same.

Attachments:

1. GoIssue.zip (1708 bytes)

[alexbrainman]

Comment 1:

simonhege,
It looks to me, your issue is not broken any more. Since
https://code.google.com/p/go/source/detail?r=75123d9d5b96
commit. I am no good with cgo and gcc, and I don't have time to investigate it further,
but if you are OK I will close it.
Alex

Labels changed: added os-windows.

Status changed to WaitingForReply.

[simonhege]

Comment 2:

I confirm that my tests cases are not broken any more.
Thank you for your work.
Simon

[minux]

Comment 3:

Status changed to Fixed.

[gopherbot]

Comment 4 by [email protected]:

I also meet this issue when I use access DB in win32 xp.