mnt:mountPt fails with invalid argument

[stijn-ucrowds]

Using nsjail inside a docker container leads to an error. The odd thing is that this occurs only on one machine, but not on others.

bool mnt::mountPt(mount_t*, const char*, const char*)():217 mount(''/' flags: type:'overlay' options:'lowerdir=/home/terr/.zerg/lib/fsmap/.tmpMtRFD1:/tmp/nsjail.999.root,upperdir=/tmp/zergos-999/overlayfs-workspaces/user_pid=127.0.0.1.18003.0Ebvvlk/overlayfs-rw,workdir=/tmp/zergos-999/overlayfs-workspaces/user_pid=127.0.0.1.18003.0Ebvvlk/overlayfs-tmp' dir:true') src:'none' dstpath:'/tmp/nsjail.999.root//' failed: Invalid argument

The docker image gets launched with

docker run --rm -it --privileged --cap-add=SYS_PTRACE -p 8881:8881 --security-opt seccomp=unconfined -v ${PWD}:/src c842960c237a

The double slash in /tmp/nsjail.999.root// looks suspicious. Could this be the issue?

Windows 11 build 22621
Docker 4.16.1 using WSL2

[stijn-ucrowds]

We figured out that it occurs on Windows 10 and 11 when the WSL kernel is verson 5.15. Reverting back to kernel version 5.10 resolves the issue.