We've spotted a regression starting from the 6.0 Nyx kernel where libxdc would continously throw libxdc_decode errors as soon as fuzzing starts for certain targets:

A complete repro is available for the Zephyr target, in development:

git clone https://github.com/IntelLabs/kAFL.git -b regression/6.0_tnt_zephyr
cd kAFL
make deploy
# let kafl setup, reboot ...
cd kAFL/kafl/examples/zephyr_x86_32
docker build -t kafl_zephyr .
docker run -ti --rm -v $PWD:/workdir -v $PWD/../nyx_api.h:/usr/local/include/nyx_api.h kafl_zephyr
./run.sh build TEST
# CTRL-D (exit container)
./run.sh fuzz

On the previous 5.10.73 kernel, these errors doesn't appear.

ping @schumilo, since you worked on the 6.0 patches, do you have any idea what could be the cause ? (the main changes with 6.0 is that we remove custom FDL code)