下面是由于线程在从 DNS 获取 TXT 记录时被锁定而遇到的死锁
java.lang.Thread.State: RUNNABLE
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:272)
at sun.security.provider.NativePRNG$RandomIO.readFully(NativePRNG.java:202)
at sun.security.provider.NativePRNG$RandomIO.ensureBufferValid(NativePRNG.java:264)
at sun.security.provider.NativePRNG$RandomIO.implNextBytes(NativePRNG.java:278)
- locked <0x00000004f3cd17b0> (a java.lang.Object)
at sun.security.provider.NativePRNG$RandomIO.access$200(NativePRNG.java:125)
at sun.security.provider.NativePRNG.engineNextBytes(NativePRNG.java:114)
at java.security.SecureRandom.nextBytes(SecureRandom.java:466)
- locked <0x00000004f111d290> (a java.security.SecureRandom)
at java.security.SecureRandom.next(SecureRandom.java:488)
at java.util.Random.nextInt(Random.java:303)
at com.sun.jndi.dns.DnsClient.query(DnsClient.java:175)
at com.sun.jndi.dns.Resolver.query(Resolver.java:81)
at com.sun.jndi.dns.DnsContext.c_getAttributes(DnsContext.java:430)
at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_getAttributes(ComponentDirContext.java:231)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:139)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:127)
at javax.naming.directory.InitialDirContext.getAttributes(InitialDirContext.java:142)
在分析时,我发现这个线程锁是由于执行 java.security.SecureRandom.next 的缓慢所致。
下面是针对遇到类似死锁的 jdk 错误提交 https://bugs.openjdk.java.net/browse/JDK-8066209
有人可以告诉我发生这种情况的原因以及如何解决这个问题吗?