Initial startup: Unable to create real-time buffer

harrison-e commented 4 months ago

Basic Information:

RTXI Version: 3.0.4 Installed from Live CD?: No, compiled from source

Error Description:

What happened?

I freshly installed Ubuntu 22.04.4 from USB, and immediately followed the instructions on rtxi.org to install Xenomai and RTXI. After rebooting in the Xenomai kernel, running ./scripts/install_rtxi.sh with the evl option, and going to run sudo rtxi, I was met with an error (See Error Message).

Some extra info:

After some digging, I see that this error is (probably) coming from a function in fifo_evl.cpp, in the function starting on line 48. It seems that evl is returning a 0 or negative value for xbuf_fd, but the evl core error code is nondescriptive ("Unknown error -2"). I'm very unfamiliar with both the RTXI and evl codebase, and I can't find a correspondence between the error codes in evl and any description online (I'm looking at the docs on the Xenomai website).

If you have any insight into what might be happening here with Xenomai, it would be greatly appreciated!!

What was supposed to happen?

RTXI was supposed to open for the first time.

What steps will trigger the error?

sudo rtxi

Error Message:

Copy error messages and terminal output between the two braces below.

user@MACHINE:/home/rtxi$ sudo rtxi
Welcome to RTXI Version 3.0.4
RT::OS::FIFO(evl) : Unable to create real-time buffer

evl core : Unknown error -2
RT::OS::getFifo(EVL) : No such file or directory
RT::System::System : failed to create Fifo
signal_handler : signal type Segmentation fault received

Backtrace:

/lib/librtxi.so(_Z15PRINT_BACKTRACEv+0x48)[0x7f49fa83bcb8]
rtxi(+0x28f82)[0x558a417f3f82]
/lib/x86_64-linux-gnu/libc.so.6(+0x42520)[0x7f49f8fd6520]
/lib/librtxi.so(+0x24fd5)[0x7f49fa842fd5]
/lib/x86_64-linux-gnu/libstdc++.so.6(+0xdc253)[0x7f49f93a0253]
/lib/x86_64-linux-gnu/libc.so.6(+0x94ac3)[0x7f49f9028ac3]
/lib/x86_64-linux-gnu/libc.so.6(+0x126850)[0x7f49f90ba850]
QMutex: destroying locked mutex
QMutex: destroying locked mutex
QMutex: destroying locked mutex

Thank you for reading!! I see there's only one active maintainer on the RTXI website, so if this is you, thank you for your service!!

harrison-e commented 4 months ago

Update:

Issue was resolved by reinstalling Xenomai kernel as root, and changing Processor type in kernel config. Thanks!

fusge commented 3 months ago

Just curious what was the previous and new setting for the processor type in your kernel configuration?

harrison-e commented 3 months ago

Previous was generic x86 and new is Core 2 / newer Xeon. The CPU used in the machine is Intel Core i9-13900KS.

RTXI / rtxi