[Bug 219935] Kernel panic in getnewvnode (possibly ZFS related)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219935

--- Comment #9 from Raimo Niskanen <raimo+freebsd at erix.ericsson.se> ---
Yes, well.  It is so seldom I use gdb so I am a noob every time.  [0] was a
misunderstanding with no harm in this case...

(kgdb) p *$7.nc_dvp 
$17 = {
  v_tag = 0xffffffff81af1c7b "zfs", 
  v_op = 0xffffffff81b048e0, 
  v_data = 0xfffff80256a1a2e0, 
  v_mount = 0xfffff8002cfae660, 
  v_nmntvnodes = {
    tqe_next = 0xfffff80023a5a588, 
    tqe_prev = 0xfffff8007ae3ad08
  }, 
  v_un = {
    vu_mount = 0x0, 
    vu_socket = 0x0, 
    vu_cdev = 0x0, 
    vu_fifoinfo = 0x0
  }, 
  v_hashlist = {
    le_next = 0x0, 
    le_prev = 0x0
  }, 
  v_cache_src = {
    lh_first = 0xfffff800178c6a80
  }, 
  v_cache_dst = {
    tqh_first = 0xfffff801cce59cb0, 
    tqh_last = 0xfffff801cce59cd0
  }, 
  v_cache_dd = 0xfffff801cce59cb0, 
  v_lock = {
    lock_object = {
      lo_name = 0xffffffff81af1c7b "zfs", 
      lo_flags = 117112832, 
      lo_data = 0, 
      lo_witness = 0x0
    }, 
    lk_lock = 1, 
    lk_exslpfail = 0, 
    lk_timo = 51, 
    lk_pri = 96
  }, 
  v_interlock = {
    lock_object = {
      lo_name = 0xffffffff80fe4d4c "vnode interlock", 
      lo_flags = 16973824, 
      lo_data = 0, 
      lo_witness = 0x0
    }, 
    mtx_lock = 4
  }, 
  v_vnlock = 0xfffff802cb6899a0, 
  v_actfreelist = {
    tqe_next = 0xfffff80256787760, 
    tqe_prev = 0xfffff802f39e2820
  }, 
  v_bufobj = {
    bo_lock = {
      lock_object = {
        lo_name = 0xffffffff80fe4d5c "bufobj interlock", 
        lo_flags = 86179840, 
        lo_data = 0, 
        lo_witness = 0x0
      }, 
      rw_lock = 1
    }, 
    bo_ops = 0xffffffff814b7380, 
    bo_object = 0xfffff801cc3e1500, 
    bo_synclist = {
      le_next = 0x0, 
      le_prev = 0x0
    }, 
    bo_private = 0xfffff802cb689938, 
    __bo_vnode = 0xfffff802cb689938, 
    bo_clean = {
      bv_hd = {
        tqh_first = 0x0, 
        tqh_last = 0xfffff802cb689a58
      }, 
      bv_root = {
        pt_root = 0
      }, 
      bv_cnt = 0
    }, 
    bo_dirty = {
      bv_hd = {
        tqh_first = 0x0, 
        tqh_last = 0xfffff802cb689a78
      }, 
      bv_root = {
        pt_root = 0
      }, 
      bv_cnt = 0
    }, 
    bo_numoutput = 0, 
    bo_flag = 0, 
    bo_bsize = 131072
  }, 
  v_pollinfo = 0x0, 
  v_label = 0x0, 
  v_lockf = 0x0, 
  v_rl = {
    rl_waiters = {
      tqh_first = 0x0, 
      tqh_last = 0xfffff802cb689ac0
    }, 
    rl_currdep = 0x0
  }, 
  v_cstart = 0, 
  v_lasta = 0, 
  v_lastw = 0, 
  v_clen = 0, 
  v_holdcnt = 1, 
  v_usecount = 0, 
  v_iflag = 512, 
  v_vflag = 0, 
  v_writecount = 0, 
  v_hash = 111896, 
  v_type = VDIR
}

(kgdb) p *vp->v_nmntvnodes.tqe_next
$18 = {
  v_tag = 0xffffffff81af1c7b "zfs", 
  v_op = 0xffffffff81b048e0, 
  v_data = 0xfffff801181e4450, 
  v_mount = 0xfffff8002cfae660, 
  v_nmntvnodes = {
    tqe_next = 0xfffff8030f9a3938, 
    tqe_prev = 0xfffff802f3fc93d0
  }, 
  v_un = {
    vu_mount = 0x0, 
    vu_socket = 0x0, 
    vu_cdev = 0x0, 
    vu_fifoinfo = 0x0
  }, 
  v_hashlist = {
    le_next = 0x0, 
    le_prev = 0x0
  }, 
  v_cache_src = {
    lh_first = 0xfffff801185a1690
  }, 
  v_cache_dst = {
    tqh_first = 0xfffff8011865a4d0, 
    tqh_last = 0xfffff8011865a4f0
  }, 
  v_cache_dd = 0xfffff8011865a4d0, 
  v_lock = {
    lock_object = {
      lo_name = 0xffffffff81af1c7b "zfs", 
      lo_flags = 117112832, 
      lo_data = 0, 
      lo_witness = 0x0
    }, 
    lk_lock = 1, 
    lk_exslpfail = 0, 
    lk_timo = 51, 
    lk_pri = 96
  }, 
  v_interlock = {
    lock_object = {
      lo_name = 0xffffffff80fe4d4c "vnode interlock", 
      lo_flags = 16973824, 
      lo_data = 0, 
      lo_witness = 0x0
    }, 
    mtx_lock = 4
  }, 
  v_vnlock = 0xfffff801eda4b9a0, 
  v_actfreelist = {
    tqe_next = 0xfffff8001f187000, 
    tqe_prev = 0xfffff8007e4309f8
  }, 
  v_bufobj = {
    bo_lock = {
      lock_object = {
        lo_name = 0xffffffff80fe4d5c "bufobj interlock", 
        lo_flags = 86179840, 
        lo_data = 0, 
        lo_witness = 0x0
      }, 
      rw_lock = 1
    }, 
    bo_ops = 0xffffffff814b7380, 
    bo_object = 0xfffff80059ffc000, 
    bo_synclist = {
      le_next = 0x0, 
      le_prev = 0x0
    }, 
    bo_private = 0xfffff801eda4b938, 
    __bo_vnode = 0xfffff801eda4b938, 
    bo_clean = {
      bv_hd = {
        tqh_first = 0x0, 
        tqh_last = 0xfffff801eda4ba58
      }, 
      bv_root = {
        pt_root = 0
      }, 
      bv_cnt = 0
    }, 
    bo_dirty = {
      bv_hd = {
        tqh_first = 0x0, 
        tqh_last = 0xfffff801eda4ba78
      }, 
      bv_root = {
        pt_root = 0
      }, 
      bv_cnt = 0
    }, 
    bo_numoutput = 0, 
    bo_flag = 0, 
    bo_bsize = 131072
  }, 
  v_pollinfo = 0x0, 
  v_label = 0x0, 
  v_lockf = 0x0, 
  v_rl = {
    rl_waiters = {
      tqh_first = 0x0, 
      tqh_last = 0xfffff801eda4bac0
    }, 
    rl_currdep = 0x0
  }, 
  v_cstart = 0, 
  v_lasta = 0, 
  v_lastw = 0, 
  v_clen = 0, 
  v_holdcnt = 1, 
  v_usecount = 0, 
  v_iflag = 512, 
  v_vflag = 0, 
  v_writecount = 0, 
  v_hash = 143216, 
  v_type = VDIR
}

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