*** NO COMMENTS ***

*** 285,294 ****
--- 285,295 ----
  }
  
  void
  ddt_phys_fill(ddt_phys_t *ddp, const blkptr_t *bp)
  {
+         ASSERT(ddp != NULL);
          ASSERT(ddp->ddp_phys_birth == 0);
  
          for (int d = 0; d < SPA_DVAS_PER_BP; d++)
                  ddp->ddp_dva[d] = bp->blk_dva[d];
          ddp->ddp_phys_birth = BP_PHYSICAL_BIRTH(bp);
*** 295,318 ****
--- 296,328 ----
  }
  
  void
  ddt_phys_clear(ddt_phys_t *ddp)
  {
+         ASSERT(ddp != NULL);
+         if (ddp) {
                  bzero(ddp, sizeof (*ddp));
+         }
  }
  
  void
  ddt_phys_addref(ddt_phys_t *ddp)
  {
+         ASSERT(ddp != NULL);
+         if (ddp) {
                  ddp->ddp_refcnt++;
+         }
  }
  
  void
  ddt_phys_decref(ddt_phys_t *ddp)
  {
+ //      ASSERT(ddp != NULL);
+         if (ddp) {
                  ASSERT((int64_t)ddp->ddp_refcnt > 0);
                  ddp->ddp_refcnt--;
+         }
  }
  
  void
  ddt_phys_free(ddt_t *ddt, ddt_key_t *ddk, ddt_phys_t *ddp, uint64_t txg)
  {
*** 331,340 ****
--- 341,357 ----
          for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
                  if (DVA_EQUAL(BP_IDENTITY(bp), &ddp->ddp_dva[0]) &&
                      BP_PHYSICAL_BIRTH(bp) == ddp->ddp_phys_birth)
                          return (ddp);
          }
+         (void) printf("ddt_phys_select() found nothing for "
+             "DVA[BP]=<%llu:%llx:%llx> and phys_birth[BP]=%llu\n",
+             (u_longlong_t)DVA_GET_VDEV(BP_IDENTITY(bp)),
+             (u_longlong_t)DVA_GET_OFFSET(BP_IDENTITY(bp)),
+             (u_longlong_t)DVA_GET_ASIZE(BP_IDENTITY(bp)),
+             (u_longlong_t)BP_PHYSICAL_BIRTH(bp)
+         );
          return (NULL);
  }
  
  uint64_t
  ddt_phys_total_refcnt(const ddt_entry_t *dde)