Networking under linux platform

Christian Helmuth christian.helmuth at
Mon Jan 28 14:28:06 CET 2019

Hello Chris,

please find my answer below.

On Fri, Jan 25, 2019 at 01:32:57PM +0100, Chris via users wrote:
> After a jump to 18.11, using the linux platform as a target, I am
> experiencing troubles
> with the linux_nic_drv:
> The creation the driver component seems to fail during the creation of the
> file descriptors for its dataspaces: lx_mmap in _map_local fails with 22
> (EINVAL) (see attached console output from the lwip_lx example).
> I tested under Ubuntu 14.04 LTS in my old build environment as well as on a
> vanilla 16.04 LTS with a freshly installed genode toolchain & the current
> master.
> Other examples, such as the demo scenario, run without any problems.
> I have found an older discussion on the list from 2014 about failed memory
> mappings, but the
> thread ended without coming to a real conclusion.
> I'd be more than glad for any idea what where to look for possible reasons
> for this behavior.
> [init -> linux_nic_drv] Error: _map_local: lx_mmap failed(addr_in=0x0,
> addr_out=0xffffffffffffffea/-22) overmap=0
> [init -> linux_nic_drv] Error: LD: exception during program load:
> 'Genode::Region_map::Region_conflict'
> [init -> linux_nic_drv] Error: Uncaught exception of type
> 'Genode::Region_map::Region_conflict'
> [init -> linux_nic_drv] Warning: abort called - thread: ep
> Warning: blocking canceled in entrypoint constructor
> [init] child "linux_nic_drv" exited with exit value 1

The linux_nic_drv is a hybrid component, which means it is part of the
Genode scenario but also links to Linux host libraries to use the tap
device for networking. Therefore, the component should be loaded by
the linux loader and not Genode's ldso. This can be fixed by declaring

  <start name="linux_nic_drv" ld="no">

in the linux_nic_drv start node. Beyond that I advise you against
using the lwip_lx ruin script because it has further issues and is
unmaintained. Please refer to repos/libports/run/fetchurl.lwip and
incorporate the linux_nic_drv. All auto-tested (and thus maintained)
run scripts can be found in tool/autopilot.list.

> [init -> test-lwip_httpsrv] Error: LD: symbol not found: '_nsyyin'
> [init -> test-lwip_httpsrv] Error: Uncaught exception of type
> 'Linker::Not_found'
> [init -> test-lwip_httpsrv] Warning: abort called - thread: ep
> [init] child "test-lwip_httpsrv" exited with exit value 1

I can't reconstruct this error and have no idea where it stems from. I
suspect your source directory is not clean (from info in your log).

  Genode 18.11-117-ged65267 <local changes>

You may also rerun the following.

  ./tool/ports/prepare_port libc lwip

Christian Helmuth
Genode Labs · · /ˈdʒiː.nəʊd/

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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