nr-gnb crashed

[auandrew]

Hello,

I got a crash while running UERANSIM's nr-gnb as follows.

1. Is this a known problem? This is from the top of the master branch.
2. I couldn't find its dumped core/crash info as said. Where is it or how to get it generated please?

Thanks,
Andrew

andrew@ThinkBook-15G2:~/Ws/open5GS202104/UERANSIM$ build/nr-gnb -c config/open5gs-gnb.yaml
UERANSIM v3.1.6
[2021-04-19 12:28:39.093] [sctp] [info] Trying to establish SCTP connection... (192.168.1.77:38412)
[2021-04-19 12:28:39.097] [sctp] [info] SCTP connection established (192.168.1.77:38412)
[2021-04-19 12:28:39.097] [sctp] [debug] SCTP association setup ascId[425]
[2021-04-19 12:28:39.097] [ngap] [debug] Sending NG Setup Request
[2021-04-19 12:28:39.098] [ngap] [debug] NG Setup Response received
[2021-04-19 12:28:39.098] [ngap] [info] NG Setup procedure is successful
[2021-04-19 12:28:43.698] [mr] [info] New UE connected to gNB. Total number of UEs [1]
[2021-04-19 12:28:43.699] [rrc] [debug] Sending RRC Setup for UE[3]
[2021-04-19 12:28:43.699] [ngap] [debug] Initial NAS message received from UE[3]
[2021-04-19 12:28:43.715] [ngap] [debug] Initial Context Setup Request received
[2021-04-19 12:28:43.933] [ngap] [info] PDU session resource(s) setup for UE[3] count[1]
terminate called after throwing an instance of 'std::runtime_error'
  what():  Bad Inet address octet string length
Aborted (core dumped)
andrew@ThinkBook-15G2:~/Ws/open5GS202104/UERANSIM$ 

[aligungr]

Hello Andrew

My guess is that UPF is trying to use IPv6 address for GTP endpoint, but I'm not sure. Please send a PCAP if you have one. In this way we can easily deduce the problem.

[auandrew]

Ok, Ali. Please find here in the attachment the pcap file and the following is my ifconfig output. Thank you!

andrew@ThinkBook-15G2:~/Ws/open5GS202104/open5gs$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:e9:f8:94:71  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 7c:8a:e1:60:2e:7e  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1382573  bytes 106723313 (106.7 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1382573  bytes 106723313 (106.7 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ogstun: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.45.0.1  netmask 255.255.0.0  destination 10.45.0.1
        inet6 fe80::65d5:bc7:506:4555  prefixlen 64  scopeid 0x20<link>
        inet6 2001:230:cafe::1  prefixlen 48  scopeid 0x0<global>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
        RX packets 35  bytes 4046 (4.0 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 364  bytes 52956 (52.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

uesimtun0: flags=369<UP,POINTOPOINT,NOTRAILERS,RUNNING,PROMISC>  mtu 1400
        inet 10.45.0.3  netmask 255.255.255.255  destination 10.45.0.3
        inet6 fe80::bbf4:5169:6ce1:3c4a  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 25  bytes 2624 (2.6 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.77  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 2001:569:7f10:6f00:a77e:56ed:70e3:856c  prefixlen 64  scopeid 0x0<global>
        inet6 2001:569:7f10:6f00:20ee:f68d:f56e:c03d  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::e496:3907:1f7e:6770  prefixlen 64  scopeid 0x20<link>
        ether 68:54:5a:6a:7d:36  txqueuelen 1000  (Ethernet)
        RX packets 3142175  bytes 2671086121 (2.6 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1311681  bytes 483003413 (483.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

gnbCrash-ueransim.pcap.tar.gz

[aligungr]

Thanks Andrew, now it is certain that UERANSIM has a bug about it. I'll fix this soon, and inform you whenever it's fixed

[auandrew]

Oh, that's great. Thanks for your speedy response & action. Appreciate it, Ali.

[aligungr]

Andrew I've just fixed and pushed to the master. I think it should work now. Thanks again for reporting this issue.

[auandrew]

I've just done a git pull, rebuild, and re-test. Yes, the original crash is no more. Thanks for your quick fix.