(no subject)

 Hi everybody,

The following commands lead the 9.0-CURRENT kernel to crash:


[root_at_freebsd /usr/home/int0dh]# ngctl
Available commands:
  config     get or set configuration of node at <path>
  connect    Connects hook <peerhook> of the node at <relpath> to <hook>
  debug      Get/set debugging verbosity level
  dot        Produce a GraphViz (.dot) of the entire netgraph.
  help       Show command summary or get more help on a specific command
  list       Show information about all nodes
  mkpeer     Create and connect a new node to the node at "path"
  msg        Send a netgraph control message to the node at "path"
  name       Assign name <name> to the node at <path>
  read       Read and execute commands from a file
  rmhook     Disconnect hook "hook" of the node at "path"
  show       Show information about the node at <path>
  shutdown   Shutdown the node at <path>
  status     Get human readable status information from the node at <path>
  types      Show information about all installed node types
  write      Send a data packet down the hook named by "hook".
  quit       Exit program
+ mkpeer ksocket myhook inet/stream/tcp
+ msg .:myhook connect inet/127.0.0.1:22

After last command the kernel panics.


Any listening TCP port can be used instead of 22. 
The panic occurs here (sys/kern/uipc_sockbuf.c):


int
sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
    struct mbuf *m0, struct mbuf *control)
{
        struct mbuf *m, *n, *nlast;
        int space = asa->sa_len;

        SOCKBUF_LOCK_ASSERT(sb);

        if (m0 && (m0->m_flags & M_PKTHDR) == 0)
        {
                panic("sbappendaddr_locked");
        }

I`ve tried with the custom kernel only, but I think that issue can be reproduced with GENERIC too.