I got below bug when starting NFS daemon on CentOS 6.3 x86_32.
100% reproducible.
[ 35.071178] =====================================
[ 35.071340] [ BUG: rpc.nfsd/3464 still has locks held! ]
[ 35.074482] 3.9.0-rc1 #50 Tainted: G W
[ 35.074627] -------------------------------------
[ 35.074751] 2 locks held by rpc.nfsd/3464:
[ 35.078010] #0: (nfsd_mutex){+.+.+.}, at: [<c11d12d8>] write_ports+0x28/0x6f0
[ 35.081121] #1: (rpcb_create_local_mutex){+.+.+.}, at: [<c146030c>] rpcb_create_local+0x3c/0x480
[ 35.083678]
[ 35.083678] stack backtrace:
[ 35.084913] Pid: 3464, comm: rpc.nfsd Tainted: G W 3.9.0-rc1 #50
[ 35.086652] Call Trace:
[ 35.087354] [<c107b0b1>] debug_check_no_locks_held+0x91/0xa0
[ 35.089598] [<c14571ed>] rpc_wait_bit_killable+0x6d/0xa0
[ 35.090988] [<c1482de5>] __wait_on_bit+0x45/0x70
[ 35.091220] [<c1457180>] ? rpc_queue_empty+0x40/0x40
[ 35.093504] [<c1482e6d>] out_of_line_wait_on_bit+0x5d/0x70
[ 35.094954] [<c1457180>] ? rpc_queue_empty+0x40/0x40
[ 35.095215] [<c1054e80>] ? autoremove_wake_function+0x50/0x50
[ 35.097755] [<c1457587>] __rpc_execute+0x137/0x1d0
[ 35.099756] [<c1457042>] ? rpc_make_runnable+0x32/0x90
[ 35.101100] [<c145763d>] rpc_execute+0x1d/0x20
[ 35.102299] [<c1451584>] rpc_run_task+0x54/0x70
[ 35.103507] [<c145169d>] rpc_call_sync+0x3d/0xa0
[ 35.104721] [<c1451743>] rpc_ping+0x43/0x60
[ 35.105826] [<c1451d8d>] rpc_create+0x12d/0x1b0
[ 35.107052] [<c145f521>] ? rpcb_get_local+0xf1/0x1d0
[ 35.107354] [<c148631d>] ? _raw_spin_unlock+0x1d/0x30
[ 35.110182] [<c146037c>] rpcb_create_local+0xac/0x480
[ 35.111491] [<c10e10c8>] ? __kmalloc+0x128/0x1b0
[ 35.111712] [<c1459b7c>] svc_rpcb_setup+0x1c/0x40
[ 35.114226] [<c1459be8>] svc_bind+0x48/0x50
[ 35.115331] [<c11ce31c>] nfsd_create_serv+0x1fc/0x2c0
[ 35.115611] [<c11cf820>] ? nfsd_svc+0x700/0x700
[ 35.115826] [<c11ce120>] ? nfsd_shutdown_generic+0x30/0x30
[ 35.119771] [<c11d18ba>] write_ports+0x60a/0x6f0
[ 35.121611] [<c11d12f2>] ? write_ports+0x42/0x6f0
[ 35.122899] [<c10cb616>] ? might_fault+0x46/0xa0
[ 35.124113] [<c1280e54>] ? _copy_from_user+0x34/0x80
[ 35.124253] [<c1107328>] ? copy_from_user+0x8/0x10
[ 35.126688] [<c11d12b0>] ? write_versions+0x400/0x400
[ 35.128799] [<c11cfdc9>] nfsctl_transaction_write+0x59/0x70
[ 35.130327] [<c11cfd70>] ? export_features_show+0x30/0x30
[ 35.131773] [<c10e4016>] vfs_write+0x86/0xd0
[ 35.132144] [<c10e4879>] sys_write+0x49/0x90
[ 35.134043] [<c1486cda>] sysenter_do_call+0x12/0x32
[ 35.167990] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
[ 35.192676] NFSD: starting 90-second grace period (net c165f200)
Regards.
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