Could you please file an issue 
at https://github.com/grpc/grpc-go/issues/new/choose and the team will be 
able to help you better there. Thanks.

On Thursday, November 30, 2023 at 9:57:19 AM UTC-8 Josh Jaques wrote:

> Hey one of my production processes has a slow leak of goroutines buiding 
> in the grpcsync CallbackSerializer function.
>
> So I thought maybe it was leaking a grpc connection somewhere and the 
> associated balancer wrapper but so far I've been unable to determine where 
> it could be happening. 
>
> I thought maybe there would be associated sockets that were leaked but I 
> haven't been able to find any sign of them as all socket counts on the host 
> look normal.
>
> Running `curl "localhost:6060/debug/pprof/goroutine?debug=2"` produces 
> output like the following which also doesn't show me much detail for the 
> actual source of where my process created these connections:
>
>
> goroutine 12 [select, 1254 minutes]:
>
> google.golang.org/grpc/internal/grpcsync.(*CallbackSerializer).run(0xc000991100,
>  
> {0x3d0a388, 0xc0009297c0})
>         /Users/me/go/pkg/mod/
> google.golang.org/gr...@v1.58.3/internal/grpcsync/callback_serializer.go:83 
> <http://google.golang.org/grpc@v1.58.3/internal/grpcsync/callback_serializer.go:83>
>  
> +0x12a
> created by google.golang.org/grpc/internal/grpcsync.NewCallbackSerializer
>         /Users/me/go/pkg/mod/
> google.golang.org/gr...@v1.58.3/internal/grpcsync/callback_serializer.go:55 
> <http://google.golang.org/grpc@v1.58.3/internal/grpcsync/callback_serializer.go:55>
>  
> +0x138
>
> goroutine 13 [select, 1254 minutes]:
>
> google.golang.org/grpc/internal/grpcsync.(*CallbackSerializer).run(0xc000991220,
>  
> {0x3d0a388, 0xc000929900})
>         /Users/me/go/pkg/mod/
> google.golang.org/gr...@v1.58.3/internal/grpcsync/callback_serializer.go:83 
> <http://google.golang.org/grpc@v1.58.3/internal/grpcsync/callback_serializer.go:83>
>  
> +0x12a
> created by google.golang.org/grpc/internal/grpcsync.NewCallbackSerializer
>         /Users/me/go/pkg/mod/
> google.golang.org/gr...@v1.58.3/internal/grpcsync/callback_serializer.go:55 
> <http://google.golang.org/grpc@v1.58.3/internal/grpcsync/callback_serializer.go:55>
>  
> +0x138
>
>
> Wondering if anyone can suggest additional tips to try debugging this? 
> Thanks for checking

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