[BUG] rxrpc/afs: leaked peer during netns teardown

[Shuangpeng Bai]

Hi,

I can reproduce an RxRPC leaked-peer warning during network namespace
teardown after adding an AFS cell.

Reproducer:

  dmesg -C

  unshare -n sh -c '
          ip link set lo up 2>/dev/null || true
          echo "add reprocell 127.0.0.1" > /proc/fs/afs/cells
          cat /proc/net/rxrpc/peers
  '

  sleep 2
  dmesg | grep "Leaked peer"

Observed output:

  Proto Local                                           Remote                                          Use SST   Maxd LastUse      RTT      RTO
  UDP   [::]:7001                                       127.0.0.1:7003                                    1  128  1440     37s       -1        0
  [   37.969040] rxrpc: Leaked peer 61 {1} 127.0.0.1:7003

Tested on:

  commit 9fbbf69eab3417732ec2adf93e42e507351dd80a
  Linux 7.1.0-13212-g9fbbf69eab34
  CONFIG_NET_NS=y
  CONFIG_AF_RXRPC=y
  CONFIG_AFS_FS=y

Thanks.