[UBUNTU 22.04] OS guest boot issues on 9p filesystem

=== Reported by <email address hidden> - 2024-05-13 03:53:01 ===

---Problem Description---
OS guest boot issues on 9p filesystem due to unix domain sockets open failure
 
Contact Information = <email address hidden> 
 
Machine Type = 3931-7G4 
 
---uname output---
5.15.0-92-generic #102-Ubuntu SMP Wed Jan 10 09:35:24 UTC 2024 s390x s390x s390x GNU/Linux
 
---Steps to Reproduce---
 #!/bin/bash

# Cleanup target dir
[ -d ./target ] && rm -rf target
mkdir target

# Add configuration updates
mkdir -p ./target/etc/initramfs-tools/
echo 9p >> ./target/etc/initramfs-tools/modules
echo 9pnet_virtio >> ./target/etc/initramfs-tools/modules

# Add the test script
cat > ./target/test_init << EOF
#!/bin/bash

echo "Test for unix domain sockets"

nc -Ul /socket &
sleep 1
echo "Sockets work" | nc -UN /socket || echo "Sockets fail"

echo o > /proc/sysrq-trigger
sleep 999
EOF
chmod 700 ./target/test_init

# Create an Ubuntu 23.10 around it
echo "Creating Ubuntu target OS"
debootstrap --variant=minbase\
            --include=udev,kmod,initramfs-tools,systemd,netcat-openbsd,linux-image-generic \
            --exclude=man,bash-completion \
            mantic ./target > /dev/null || exit 1

# Run the test in 9p forwarded filesystem
echo "Running OS in qemu"
qemu-system-s390x \
  -m 8192 \
  -smp 4 \
  -nodefaults -nographic -no-reboot -no-user-config \
  -kernel ./target/boot/vmlinuz \
  -initrd ./target/boot/initrd.img \
  -append 'root=fsRoot rw rootfstype=9p rootflags=trans=virtio,version=9p2000.L,msize=512000,cache=mmap,posixacl console=ttysclp0 init=/test_init quiet' \
  -fsdev local,security_model=passthrough,multidevs=remap,id=fsdev-fsRoot,path=./target \
  -device virtio-9p-pci,id=fsRoot,fsdev=fsdev-fsRoot,mount_tag=fsRoot \
  -device virtio-serial-ccw -device sclpconsole,chardev=console \
  -chardev stdio,id=console,signal=off 

 
---Debugger---
A debugger is not configured

Userspace rpm: qemu-(current).deb 
 
Userspace tool common name: qemu 

Userspace tool obtained from project website:  na 
 
The userspace tool has the following bit modes: both 
 
*Additional Instructions for <email address hidden>:
-Attach ltrace and strace of userspace application.