Starting the gnb got "Floating point exception" on 24.04

[wei-lou]

Issue Description

Starting the "gnb" got the "Floating point exception". The program exit after the error.

Setup Details

This is a FDD setup with Fujitsu n71 ORAN radio operates at 10MHz with 4x4 MIMO.

Expected Behavior

Starting "gnb" with no exception

Actual Behaviour

"gnb" execution exit after the error

Steps to reproduce the problem

This is a newly compiled 24.04 on bare metal server. Issue is consistent with no other tweaking

Additional Information

Execution terminal display, srsran configuration file and gnb.log are attached as follow.

sulabuser@srsgnb03:~$ sudo srsRAN_Project2404/build/apps/gnb/gnb -c srsRAN_Project2404/configs/FUJI_GEN1TB_RU_n71_10mhz_4x4_v7.yml

The PRACH detector will not meet the performance requirements with the configuration {Format 0, ZCZ 2, SCS 1.25kHz, Rx ports 1}.

--== srsRAN gNB (commit 78238fd15) ==--

Connecting to AMF on 192.168.70.220:38412
Initializing the Open Fronthaul Interface for sector#0: ul_compr=[BFP,9], dl_compr=[BFP,9], prach_compr=[BFP,9], prach_cp_enabled=true, downlink_broadcast=false.
Operating a 10MHz cell over a RU with instantaneous bandwidth of 100MHz
Warning: Configured PRACH occasion collides with PUCCH RBs ([0..1) intersects [0..6)). Some interference between PUCCH and PRACH is expected.
Warning: Configured PRACH occasion collides with PUCCH RBs ([0..1) intersects [0..6)). Some interference between PUCCH and PRACH is expected.
Cell pci=140, bw=10 MHz, 4T4R, dl_arfcn=124400 (n71), dl_freq=622.0 MHz, dl_ssb_arfcn=123890, ul_freq=668.0 MHz

==== gNodeB started ===
Type <t> to view trace
Floating point exception
sulabuser@srsgnb03:~$

gnb.log FUJI_RU_n71_10mhz_4x4_v7.txt

[ismagom]

Hi @wei-lou ,

I tested your configuration and works well with the latest commit. I notice you are using the option ru_bandwidth_MHz: 100. Is that intended? Doesn't the RU support 10 MHz?

[wei-lou]

Hi @ismagom,

My RU does support 10MHz. I changed the ru_bandwidth_MHz: 10, now it is working. Thanks you for point this error out.

Wei,