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サーバーがインアクティブ時、Java プログラムで "/dev/random" がハングアップする

Solution Verified - Updated -

Issue

  • Java プログラムで "/dev/random" の読み込みがハングアップします。
  • エントロピーが低すぎて、乱数を十分に生成できません。

  • 乱数を生成し続けるスレッドを Java プログラムが待つためにハングアップします。

        "main" prio=10 tid=0x00002aab580e2000 nid=0x6c98 runnable [0x000000004044f000]
       java.lang.Thread.State:RUNNABLE
         at java.io.FileInputStream.readBytes(Native Method)
         at java.io.FileInputStream.read(FileInputStream.java:199)
         at sun.security.provider.NativePRNG$RandomIO.readFully(NativePRNG.java:185)
         at sun.security.provider.NativePRNG$RandomIO.implGenerateSeed(NativePRNG.java:202)
         - locked <0x00002aaad23739a0> (a java.lang.Object)
         at sun.security.provider.NativePRNG$RandomIO.access$300(NativePRNG.java:108)
         at sun.security.provider.NativePRNG.engineGenerateSeed(NativePRNG.java:102)
         at java.security.SecureRandom.generateSeed(SecureRandom.java:495)

Environment

  • Red Hat Enterprise Linux 5 (すべてのアーキテクチャー)
  • Red Hat Enterprise Linux 6 (すべてのアーキテクチャー)
  • Java アプリケーション
  • JBoss Enterprise Application Platform (EAP)
  • Tomcat

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