[jira] [Created] (HDFS-6674) UserGroupInformation.loginUserFromKeytab will hang forever if keytab file length is less than 6 byte.

["liuyang (JIRA)" <ji...@apache.org>]

liuyang created HDFS-6674:
-----------------------------

             Summary: UserGroupInformation.loginUserFromKeytab will hang forever if keytab file length  is less than 6 byte.
                 Key: HDFS-6674
                 URL: https://issues.apache.org/jira/browse/HDFS-6674
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: security
    Affects Versions: 2.0.1-alpha
            Reporter: liuyang
            Priority: Minor


The jstack is as follows:
   java.lang.Thread.State: RUNNABLE
	at java.io.FileInputStream.available(Native Method)
	at java.io.BufferedInputStream.available(BufferedInputStream.java:399)
	- locked <0x0000000745585330> (a sun.security.krb5.internal.ktab.KeyTabInputStream)
	at sun.security.krb5.internal.ktab.KeyTab.load(KeyTab.java:257)
	at sun.security.krb5.internal.ktab.KeyTab.<init>(KeyTab.java:97)
	at sun.security.krb5.internal.ktab.KeyTab.getInstance0(KeyTab.java:124)
	- locked <0x0000000745586560> (a java.lang.Class for sun.security.krb5.internal.ktab.KeyTab)
	at sun.security.krb5.internal.ktab.KeyTab.getInstance(KeyTab.java:157)
	at javax.security.auth.kerberos.KeyTab.takeSnapshot(KeyTab.java:119)
	at javax.security.auth.kerberos.KeyTab.getEncryptionKeys(KeyTab.java:192)
	at javax.security.auth.kerberos.JavaxSecurityAuthKerberosAccessImpl.keyTabGetEncryptionKeys(JavaxSecurityAuthKerberosAccessImpl.java:36)
	at sun.security.jgss.krb5.Krb5Util.keysFromJavaxKeyTab(Krb5Util.java:381)
	at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:701)
	at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:584)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at javax.security.auth.login.LoginContext.invoke(LoginContext.java:784)
	at javax.security.auth.login.LoginContext.access$000(LoginContext.java:203)
	at javax.security.auth.login.LoginContext$5.run(LoginContext.java:721)
	at javax.security.auth.login.LoginContext$5.run(LoginContext.java:719)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.login.LoginContext.invokeCreatorPriv(LoginContext.java:718)
	at javax.security.auth.login.LoginContext.login(LoginContext.java:590)
	at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytab(UserGroupInformation.java:679)



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