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【ethereum】 Segmentation fault at mining

I built cpp-ethereum on ubuntu 14.04 with following
Building on Ubuntu · ethereum/cpp-ethereum Wiki · GitHub

Then, I started mining with this command.

./eth -m on


Please enter your MASTER password: 
Ethereum (++) 0.9.21
  Code by Gav Wood et al, (c) 2013, 2014, 2015.
  Based on a design by Vitalik Buterin.

Transaction Signer: 0000000000000000000000000000000000000000
Mining Benefactor: 0000000000000000000000000000000000000000
Node ID: enode://d67816d427dd754f33e11ee0515ed435863d45b61e63cf90ab0496c643a2b24f4222be936e2183e86822300b0f7605d1d01baa972039a4506872d9fb2f071062@127.0.0.1:30303
  ℹ  11:18:26|eth  Post state changed: Restarting mining...
 ⚡   11:18:26|eth  working 0.000624 s
 ⚡   11:18:26|eth  post 2e-05 s
  ℹ  11:18:39|miner1  Loading from libethash...
  ℹ  11:18:39|miner2  Loading from libethash...
  ℹ  11:18:39|miner0  Loading from libethash...
  ℹ  11:18:39|miner1  Done loading.
  ℹ  11:18:39|miner0  Done loading.
  ℹ  11:18:39|miner2  Done loading.
Segmentation fault (コアダンプ)

I got Segmentation fault.


To resolve this circumstance, I limited number of threads like this.

./eth -m on -t 2

It works now for me