编年史队列中的SIGSEGV 4.5.19

Question

什么会导致“纪事”队列出现分段故障？我想我错过了一个配置。我创建了一个readOnly编年史队列，如下所示：

ChronicleQueue readQueue =  SingleChronicleQueueBuilder.binary (readBasePath).readOnly (true).build ();

JVM段出现了故障: 2016-12-31T00:00:00，这就是我假设队列文件被循环的时候。这就是环境：

编年史队列4.5.19 JVM OpenJDK 1.8.0_112-b16 Ubuntu14.04.3 LTS Linux3.13.0-74

下面是堆栈跟踪：

> V  [libjvm.so+0xa08d97]  
J 875  sun.misc.Unsafe.compareAndSwapInt(Ljava/lang/Object;JII)Z (0 bytes) @ 0x00007fde1d328c46 [0x00007fde1d328b80+0xc6]
j  net.openhft.chronicle.core.UnsafeMemory.compareAndSwapInt(JII)Z+8
j  net.openhft.chronicle.bytes.NativeBytesStore.compareAndSwapInt(JII)Z+17
j  net.openhft.chronicle.bytes.AbstractBytes.compareAndSwapInt(JII)Z+16
j  net.openhft.chronicle.wire.AbstractWire.writeEndOfWire(JLjava/util/concurrent/TimeUnit;J)V+32
j  net.openhft.chronicle.queue.impl.single.SingleChronicleQueueStore.writeEOF(Lnet/openhft/chronicle/wire/Wire;J)V+9
j  net.openhft.chronicle.queue.impl.single.SingleChronicleQueueExcerpts$StoreTailer.checkMoveToNextCycle(ZLnet/openhft/chronicle/bytes/Bytes;)Z+43
j  net.openhft.chronicle.queue.impl.single.SingleChronicleQueueExcerpts$StoreTailer.inACycle(Z)Z+176
j  net.openhft.chronicle.queue.impl.single.SingleChronicleQueueExcerpts$StoreTailer.next(Z)Z+12
j  net.openhft.chronicle.queue.impl.single.SingleChronicleQueueExcerpts$StoreTailer.readingDocument(Z)Lnet/openhft/chronicle/wire/DocumentContext;+6
j  net.openhft.chronicle.queue.ExcerptTailer.readingDocument()Lnet/openhft/chronicle/wire/DocumentContext;+2
j  net.openhft.chronicle.wire.MarshallableIn.readDocument(Lnet/openhft/chronicle/wire/ReadMarshallable;)Z+1

Answer 1

看上去像是种族状况。当内存映射被真正释放时，它将无法被访问，或者它将触发分段错误。我怀疑这是因为从一个周期到下一个周期，它应该是免费的。

我增加了一个问题https://github.com/OpenHFT/Chronicle-Queue/issues/319