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Date:      Thu, 14 Dec 2023 14:05:03 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 275731] panic in zfs: VERIFY(buf[i] == 0) failed
Message-ID:  <bug-275731-227-336hJYD11A@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-275731-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-275731-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D275731

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

*db =3D
  {db =3D {
      db_object =3D 144497, db_offset =3D 0, db_size =3D 512,=20
      db_data =3D 0xffffa00184020a00},
   db_objset =3D 0xffffa00004ac3000,=20
   db_dnode_handle =3D 0xffffa0019f8cd618, db_parent =3D 0xffffa0015a5557f8=
,=20
   db_hash_next =3D 0x0,
   db_link =3D {avl_child =3D {0x0, 0x0}, avl_pcb =3D 1}, db_blkid =3D 0,=20
   db_blkptr =3D 0xffff0000f9cab240, db_level =3D 0 '\000',
   db_rwlock =3D {
     lock_object =3D {
       lo_name =3D 0xffff000000c16eaf "db->db_rwlock",
       lo_flags =3D 577830912, lo_data =3D 0,=20
       lo_witness =3D 0x0}, sx_lock =3D 1},
   db_buf =3D 0xffffa000bb982480,
   db_mtx =3D {
     lock_object =3D {
       lo_name =3D 0xffff000000bf395d "db->db_mtx", lo_flags =3D 577830912,=
=20
       lo_data =3D 0, lo_witness =3D 0x0},
     sx_lock =3D 18446462602811342848},=20
   db_state =3D DB_CACHED,
   db_holds =3D {
     rc_count =3D 2, rc_mtx =3D {
       lock_object =3D {
         lo_name =3D 0xffff000000c8cca3 "rc->rc_mtx",
         lo_flags =3D 577830912, lo_data =3D 0, lo_witness =3D 0x0},
       sx_lock =3D 1},
     rc_tree =3D {
       avl_root =3D 0x0,=20
       avl_compar =3D 0xffff000000162ee0 <zfs_refcount_compare>,
       avl_offset =3D 0,=20
       avl_numnodes =3D 0},
     rc_removed =3D {
       list_size =3D 48, list_offset =3D 0,
       list_head =3D {
         list_next =3D 0xffffa0003d1c3c40, list_prev =3D 0xffffa0003d1c3c40}
     },
     rc_removed_count =3D 0, rc_tracked =3D 0},
   db_changed =3D {
     cv_description =3D 0xffff000000c0b27b "db->db_changed", cv_waiters =3D=
 0},
   db_data_pending =3D 0x0,
   db_dirty_records =3D {
     list_size =3D 408, list_offset =3D 40,=20
     list_head =3D {
       list_next =3D 0xffffa0003d1c3c80, list_prev =3D 0xffffa0003d1c3c80}},
   db_cache_link =3D {list_next =3D 0x0, list_prev =3D 0x0},
   db_caching_status =3D DB_NO_CACHE,=20
   db_hash =3D 3780604374730761540, db_user =3D 0x0,
   db_user_immediate_evict =3D 0 '\000',=20
   db_freed_in_flight =3D 0 '\000', db_pending_evict =3D 0 '\000',
   db_dirtycnt =3D 0 '\000',=20
   db_partial_read =3D 1 '\001'}

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

--=20
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