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>Number: 60629
>Category: kern
>Synopsis: eqos(4) problem with checksum offload?
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Aug 22 00:40:00 +0000 2026
>Originator: Jeff Rizzo
>Release: 11.99.7
>Organization:
>Environment:
NetBSD riscv64 11.99.7 NetBSD 11.99.7 (GENERIC64) #3: Sat Aug 22 00:16:37 UTC 2026 [email protected]:/tank/netbsd/current/obj.riscv-riscv64/sys/arch/riscv/compile/GENERIC64 riscv
>Description:
When trying to ssh to certain hosts (looks like ones on my local LAN, but I'm not 100% sure), I was noticing errors on console:
[ 256.3266933] eqos0: TX [45] tx error: 0x10009000
[ 256.3266933] eqos0: TX [48] tx error: 0x10009000
[ 256.3266933] eqos0: TX [56] tx error: 0x10009000
...and the ssh wouldn't complete. A little digging showed that that error looks related to checksum offload, so I disabled it with:
ifconfig eqos0 -tcp4csum-tx -udp4csum-tx -ip4csum-tx
...and all the hosts I was having ssh issues with magically started working.
>How-To-Repeat:
ssh from the visionfive 2 board I'm setting up to a host on my LAN
See tx errors on console and output errors via netstat:
netstat -i -I eqos0
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Colls
eqos0 1500 <Link> 6c:cf:39:00:af:d8 3708 1 819 20 0
eqos0 1500 fe80::/64 fe80::d395:465a:c 3708 1 819 20 0
eqos0 1500 10.187/16 10.187.3.237 3708 1 819 20 0
eqos0 1500 2001:5a8:4cf5 2001:5a8:4cf5:9b0 3708 1 819 20 0
eqos0 1500 fde3:ec59:ddd fde3:ec59:dddc:0: 3708 1 819 20 0
>Fix:
yes please. I'm currently working around it by disabling tx checksum offloading.