Fiasco.OC: sigma0 stucks in ipc-path

Adam Lackorzynski adam at
Sun Jun 3 16:36:32 CEST 2012


On Thu May 31, 2012 at 18:30:07 +0200, Stefan kalkowski wrote:
> I think I came along a problem in the IPC-path of Fiasco.OC sometimes in
> the past, but it was somehow hard to reproduce. But now I've an example
> that quite reliable triggers the issue.
> The symptom in the past, and in the concrete example was that our
> roottask in Genode (called core) was requesting memory from sigma0,
> either implicitly just by touching some memory-area, like a ROM-module
> loaded by the bootloader, or explicitly by using the sigma0-protocol,
> e.g. to request I/O memory for the framebuffer. After that the request
> was received by sigma0, and also processed, but the answer never reached
> the faulter/client in this case the core-pager thread. The typical
> picture in the kernel-debugger then looks like the following:

I'm wondering how the higher-prio and ready 'pthread' thread relates to
that. Is it always ready and doing something?

Adam                 adam at

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