[Bug 275731] panic in zfs: VERIFY(buf[i] == 0) failed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275731

--- Comment #1 from John F. Carr <jfc@mit.edu> ---
The object that failed verification prints as

*db =
  {db = {
      db_object = 144497, db_offset = 0, db_size = 512, 
      db_data = 0xffffa00184020a00},
   db_objset = 0xffffa00004ac3000, 
   db_dnode_handle = 0xffffa0019f8cd618, db_parent = 0xffffa0015a5557f8, 
   db_hash_next = 0x0,
   db_link = {avl_child = {0x0, 0x0}, avl_pcb = 1}, db_blkid = 0, 
   db_blkptr = 0xffff0000f9cab240, db_level = 0 '\000',
   db_rwlock = {
     lock_object = {
       lo_name = 0xffff000000c16eaf "db->db_rwlock",
       lo_flags = 577830912, lo_data = 0, 
       lo_witness = 0x0}, sx_lock = 1},
   db_buf = 0xffffa000bb982480,
   db_mtx = {
     lock_object = {
       lo_name = 0xffff000000bf395d "db->db_mtx", lo_flags = 577830912, 
       lo_data = 0, lo_witness = 0x0},
     sx_lock = 18446462602811342848}, 
   db_state = DB_CACHED,
   db_holds = {
     rc_count = 2, rc_mtx = {
       lock_object = {
         lo_name = 0xffff000000c8cca3 "rc->rc_mtx",
         lo_flags = 577830912, lo_data = 0, lo_witness = 0x0},
       sx_lock = 1},
     rc_tree = {
       avl_root = 0x0, 
       avl_compar = 0xffff000000162ee0 <zfs_refcount_compare>,
       avl_offset = 0, 
       avl_numnodes = 0},
     rc_removed = {
       list_size = 48, list_offset = 0,
       list_head = {
         list_next = 0xffffa0003d1c3c40, list_prev = 0xffffa0003d1c3c40}
     },
     rc_removed_count = 0, rc_tracked = 0},
   db_changed = {
     cv_description = 0xffff000000c0b27b "db->db_changed", cv_waiters = 0},
   db_data_pending = 0x0,
   db_dirty_records = {
     list_size = 408, list_offset = 40, 
     list_head = {
       list_next = 0xffffa0003d1c3c80, list_prev = 0xffffa0003d1c3c80}},
   db_cache_link = {list_next = 0x0, list_prev = 0x0},
   db_caching_status = DB_NO_CACHE, 
   db_hash = 3780604374730761540, db_user = 0x0,
   db_user_immediate_evict = 0 '\000', 
   db_freed_in_flight = 0 '\000', db_pending_evict = 0 '\000',
   db_dirtycnt = 0 '\000', 
   db_partial_read = 1 '\001'}

The db_data field points to something kgdb can't read from the core dump
("Cannot access memory at address 0xffffa00184020a00").

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