db> bt/a ffffffff8fec15c0
pid 347.1 at 0x980000041096e000
0x980000041096f450: kernel_text+dc (0,0,0,0) ra ffffffff803720cc sz 0
0x980000041096f450: mi_switch+14c (0,0,0,0) ra ffffffff8036f5d8 sz 80
0x980000041096f4a0: sleepq_block+c0 (0,0,0,0) ra ffffffff80371ba4 sz 64
0x980000041096f4e0: mtsleep+dc (0,0,0,0) ra ffffffff80328448 sz 96
0x980000041096f540: uvm_km_kmem_alloc+248 (0,0,0,0) ra ffffffff80390208 sz 96
0x980000041096f5a0: pool_page_alloc+30 (0,0,0,0) ra ffffffff80391544 sz 32
0x980000041096f5c0: pool_grow+44 (0,0,0,0) ra ffffffff8039118c sz 48
0x980000041096f5f0: pool_get+64 (0,0,0,0) ra ffffffff802d8ea8 sz 64
0x980000041096f630: nfs_loadvnode+48 (0,0,0,1c) ra ffffffff803e54d4 sz 80
0x980000041096f680: vcache_get+33c (0,ffffffff8efe6058,1c,980000041096f740) ra ffffffff802d8fc0 sz 192
0x980000041096f740: nfs_nget1+20 (0,ffffffff8efe6058,1c,980000041096f740) ra ffffffff802f7b78 sz 64
0x980000041096f780: nfs_lookup+b20 (0,ffffffff8efe6058,1c,980000041096f740) ra ffffffff803ecd2c sz 352
0x980000041096f8e0: VOP_LOOKUP+34 (0,980000041096f910,980000041096fc80,980000041096f740) ra ffffffff803d50b8 sz 48
0x980000041096f910: lookup_once+1d0 (0,980000041096f910,980000041096fc80,980000041096f9d0) ra ffffffff803d5af0 sz 112
0x980000041096f980: namei_tryemulroot.constprop.9+448 (0,0,0,0) ra ffffffff803d7304 sz 400
0x980000041096fb10: namei+44 (980000041096fc30,0,0,0) ra ffffffff803e717c sz 48
0x980000041096fb40: vn_open+94 (980000041096fc30,0,0,0) ra 0 sz 0
User-level: pid 66.1