Block number cannot increase, do not know why

Hi, I have been setting up an Ethereum private chain. However, I cannot mine any new blocks any more two weeks ago. The block number stopped at 11063. Not matter I use "geth --mine" or "miner.start()" in geth, no new blocks are generated. I do not know why. Could any one give me some idea? Command follows.

[email protected]:~# geth --mine --networkid 42 --nodiscover --maxpeers 4 console
I1008 09:51:49.334615 ethdb/database.go:82] Alloted 128MB cache and 1024 file handles to /root/.ethereum/chaindata
I1008 09:51:49.685142 ethdb/database.go:169] closed db:/root/.ethereum/chaindata
I1008 09:51:49.690085 ethdb/database.go:82] Alloted 128MB cache and 1024 file handles to /root/.ethereum/chaindata
I1008 09:51:49.734474 ethdb/database.go:82] Alloted 16MB cache and 16 file handles to /root/.ethereum/dapp
I1008 09:51:49.746383 eth/backend.go:172] Protocol Versions: [63 62], Network Id: 42
I1008 09:51:49.746605 eth/backend.go:201] Blockchain DB Version: 3
I1008 09:51:49.749477 core/blockchain.go:206] Last header: #11063 [93f2d300…] TD=17583064089
I1008 09:51:49.749578 core/blockchain.go:207] Last block: #11063 [93f2d300…] TD=17583064089
I1008 09:51:49.749629 core/blockchain.go:208] Fast block: #11063 [93f2d300…] TD=17583064089
I1008 09:51:49.770223 p2p/server.go:313] Starting Server
I1008 09:51:49.789904 p2p/server.go:556] Listening on [::]:30303
I1008 09:51:49.810592 eth/backend.go:454] Automatic pregeneration of ethash DAG ON (ethash dir: /root/.ethash)
I1008 09:51:49.811305 node/node.go:296] IPC endpoint opened: /root/.ethereum/geth.ipc
I1008 09:51:49.811447 miner/miner.go:119] Starting mining operation (CPU=1 TOT=2)
I1008 09:51:49.812027 miner/worker.go:573] commit new work on block 11064 with 0 txs & 0 uncles. Took 503.318µs
I1008 09:51:49.812132 ethash.go:259] Generating DAG for epoch 0 (size 1073739904) (0000000000000000000000000000000000000000000000000000000000000000)
I1008 09:51:49.866644 eth/backend.go:461] checking DAG (ethash dir: /root/.ethash)
Welcome to the Geth JavaScript console!

instance: Geth/v1.4.11-stable/linux/go1.5.1
coinbase: 0x1738351a78ed92bb2e092c79ca64397b338bd272
at block: 11063 (Tue, 27 Sep 2016 13:09:19 CST)
datadir: /root/.ethereum
modules: admin:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0

> I1008 09:51:51.642537 ethash.go:276] Done generating DAG for epoch 0, it took 1.83039676s

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