Index: netinet/in_pcb.c
===================================================================
--- netinet/in_pcb.c	(revision 224109)
+++ netinet/in_pcb.c	(working copy)
@@ -56,6 +56,7 @@
 #ifdef DDB
 #include <ddb/ddb.h>
 #endif
+#include <sys/ktr.h>
 
 #include <vm/uma.h>
 
@@ -268,6 +269,8 @@
 		inp->inp_lport = 0;
 		return (EAGAIN);
 	}
+	CTR3(KTR_INPCB, "in_pcbbind: PCB insert %p (%d -> %d)", inp,
+	    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 	if (anonport)
 		inp->inp_flags |= INP_ANONPORT;
 	return (0);
@@ -578,6 +581,8 @@
 			inp->inp_lport = 0;
 			return (EAGAIN);
 		}
+		CTR3(KTR_INPCB, "in_pcbconnect: PCB insert %p (%d -> %d)", inp,
+		    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 	}
 
 	/* Commit the remaining changes. */
@@ -586,6 +591,8 @@
 	inp->inp_faddr.s_addr = faddr;
 	inp->inp_fport = fport;
 	in_pcbrehash(inp);
+	CTR3(KTR_INPCB, "in_pcbconnect: PCB rehash %p (%d -> %d)", inp,
+	    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 
 	if (anonport)
 		inp->inp_flags |= INP_ANONPORT;
@@ -953,6 +960,8 @@
 	inp->inp_faddr.s_addr = INADDR_ANY;
 	inp->inp_fport = 0;
 	in_pcbrehash(inp);
+	CTR3(KTR_INPCB, "in_pcbdisconnect: PCB rehash %p (%d -> %d)", inp,
+	    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 }
 
 /*
@@ -1123,6 +1132,8 @@
 			free(phd, M_PCB);
 		}
 		inp->inp_flags &= ~INP_INHASHLIST;
+		CTR3(KTR_INPCB, "in_pcbdrop: PCB remove %p (%d -> %d)", inp,
+		    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 	}
 }
 
@@ -1600,6 +1611,8 @@
 			free(phd, M_PCB);
 		}
 		inp->inp_flags &= ~INP_INHASHLIST;
+		CTR3(KTR_INPCB, "in_pcbremlists: PCB remove %p (%d -> %d)", inp,
+		    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 	}
 	LIST_REMOVE(inp, inp_list);
 	pcbinfo->ipi_count--;
Index: netinet/tcp_syncache.c
===================================================================
--- netinet/tcp_syncache.c	(revision 224109)
+++ netinet/tcp_syncache.c	(working copy)
@@ -696,6 +696,8 @@
 		}
 		goto abort;
 	}
+	CTR3(KTR_INPCB, "syncache_socket: PCB insert %p (%d -> %d)", inp,
+	    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 #ifdef IPSEC
 	/* Copy old policy into new socket's. */
 	if (ipsec_copy_policy(sotoinpcb(lso)->inp_sp, inp->inp_sp))
Index: netinet/tcp_usrreq.c
===================================================================
--- netinet/tcp_usrreq.c	(revision 224109)
+++ netinet/tcp_usrreq.c	(working copy)
@@ -1098,6 +1098,8 @@
 		return EADDRINUSE;
 	inp->inp_laddr = laddr;
 	in_pcbrehash(inp);
+	CTR3(KTR_INPCB, "tcp_connect: PCB rehash %p (%d -> %d)", inp,
+	    ntohs(inp->inp_fport), ntohs(inp->inp_lport));
 
 	/*
 	 * Compute window scaling to request:
Index: sys/ktr.h
===================================================================
--- sys/ktr.h	(revision 224109)
+++ sys/ktr.h	(working copy)
@@ -77,6 +77,8 @@
 #define	KTR_BUF		0x40000000		/* Buffer cache */
 #define	KTR_ALL		0x7fffffff
 
+#define	KTR_INPCB	(KTR_NET)		/* Internet PCB operations */
+
 /*
  * Trace classes which can be assigned to particular use at compile time
  * These must remain in high 22 as some assembly code counts on it