GDBServer not starting or listening on port when run inside of Docker

user_2475951 0
Viewed 3280

I am trying to compile a "hello world" Rust program inside a Docker container and then remotely debug it using GDBServer and CLion, but I don't think gdbserver is starting correctly. When I start it, I don't get the "process started" and "listening on port..." messages I expect; I get nothing.

I have successfully done this with a Raspberry Pi on my home network, but can't get it to work when using Docker.

My ultimate goal is to deploy this Docker container on a Digital Ocean droplet and debug remotely from my local machine. For now, I've got Docker running on the local machine.

I am working on a Mac (Mojave), running Docker (v18.09), and spinning up a Docker container that is an image built from Debian with Rust and gdbserver installed. GDBServer and Rust are installed by:

# install curl (needed to install rust)
apt-get update && apt-get install -y curl gdb g++-multilib lib32stdc++6 libssl-dev libncurses5-dev

# install rust + cargo nightly
curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain nightly

I start the container with docker run --rm -it -v $(pwd):/source -p 7777:7777 schickling/rust which starts up bash by default.

Once in the container, I compile the Rust program using rustc -g -o ./program ./src/main.rs which outputs a single file: program. I can run the program fine (it only outputs Hello World).

When I run gdbserver localhost:7777 ./program inside Docker, the terminal just hangs. I've let it sit for 20 minutes. I can't connect to it from CLion, and even ping doesn't work from my Mac. I've tried adding the --debug flag which outputs my_waitpid (11, 0x0) and then hangs. I've also tried :7777, 127.0.0.1:7777, and host:7777. I've tried several different ports.

I'm not sure where my problem is. It may be that GDBServer is running and the issue is in my CLion setup, but I doubt it. I have path mappings setup and target remote args is tcp:127.0.0.1:7777. I just get Connection closed. Symbol File and Sys Root are empty, but that has worked in the past with my Raspberry Pi.

clion rust docker gdbserver debugging
1 Answers

I figured out how to run my Docker container as --privileged which allows gdbserver to run correctly. I also updated some of my CLion configs and got it working.

The useful links:

My updated docker command docker run --rm -it -v $(pwd):/source -p 7777:7777 -e container=docker --privileged schickling/rust

And my Run configuration:

  • GDB: Bundled
  • 'target remote' args: tcp:localhost:7777
  • Symbolfile: The local copy of my compiled binary (copied from Docker thanks to volumes)
  • Sysroot: (blank)
  • Pathmappings: The absolute path to my project directory in Docker, and the absolute path to the same project directory on my local machine (the same volume)

Works like a charm.

user_24759510
Related