sendmmsg() and recvmmsg() fail with bad address

[MPK1]

Description

When trying to transmit a 8GB file using the -j and -g parameters, the connection fails. The handshake seems to complete according to the debug logs. The following errormessage is printed:

12:56:42.361 [WARN] sendmmsg failed: Bad address
12:56:42.361 [WARN] engine: error sending packet for regular connection CF436FAFAB812484 - close it; src: 0.0.0.0:47305; dst: 10.0.0.2:4433; errno: 14

When using the exact same configurations but omitting the -j -g in both commmands, everything works as it should.
Using just one of the two options or on just one endpoint leads to the same error.

Environment:

• Two machines with Debian Bullseye (Linux 5.10.0-8-amd64, x86_64)
• One machine running the http_client, the other one running the http_server
• Machines connected with direct 10G link. IP addresses 10.0.0.{1,2}, hostname server in /etc/hosts of the client
• Client started with ./http_client -p file -7 download -H server -s server:4433/file -G logs -j -g
• Server started with ./http_server -s 10.0.0.2:4433 -r www -c server,certs/cert.pem,certs/priv.key -G logs -j -g

Are there any known issues with those options?
Thank you for your help!