DB-1676: better handling of async read failures#5
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stef1927 merged 2 commits intoriptano:dse-netty-4.1.13.Finalfrom Feb 13, 2018
Merged
DB-1676: better handling of async read failures#5stef1927 merged 2 commits intoriptano:dse-netty-4.1.13.Finalfrom
stef1927 merged 2 commits intoriptano:dse-netty-4.1.13.Finalfrom
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tjake
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Feb 12, 2018
stef1927
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Motivation:
ReferenceCountedOpenSslEngine is careful to lock access to `ssl`
almost everywhere (manually verified) *except* in the constructor.
Since `ssl` is non-final, it does not enjoy automatic thread safety
of the code that uses it. Specifically, that means netty tcnative
code is not thread safe.
Modifications:
Ensure that all ssl engine intialization and variables related to
it are properly synchronized by adding in the constructor.
Result:
Less noisy race detector.
Notes:
The specific racing threads are:
```
Read of size 8 at 0x7b5400019ff8 by thread T52 (mutexes: write M215300):
#0 ssl_do_info_callback .../src/ssl/ssl_lib.c:2602:24 (f077793ecd812aeebb37296c987f655c+0x23c6834)
#1 ssl_process_alert .../src/ssl/tls_record.c:473:3 (f077793ecd812aeebb37296c987f655c+0x23a5346)
#2 tls_open_record .../src/ssl/tls_record.c:338:12 (f077793ecd812aeebb37296c987f655c+0x23a5289)
#3 ssl3_get_record .../src/ssl/s3_pkt.c:146:7 (f077793ecd812aeebb37296c987f655c+0x23a3da0)
#4 ssl3_read_app_data .../src/ssl/s3_pkt.c:388:17 (f077793ecd812aeebb37296c987f655c+0x23a368f)
#5 ssl_read_impl .../src/ssl/ssl_lib.c:722:15 (f077793ecd812aeebb37296c987f655c+0x23c0895)
#6 SSL_read .../src/ssl/ssl_lib.c:743:10 (f077793ecd812aeebb37296c987f655c+0x23c075b)
#7 netty_internal_tcnative_SSL_readFromSSL .../netty_tcnative/openssl-dynamic/src/main/c/ssl.c:946:12 (f077793ecd812aeebb37296c987f655c+0x23827f7)
#8 <null> <null> (0x7fc0760193be)
#9 io.netty.handler.ssl.ReferenceCountedOpenSslEngine.readPlaintextData(Ljava/nio/ByteBuffer;)I (ReferenceCountedOpenSslEngine.java:449)
#10 io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap([Ljava/nio/ByteBuffer;II[Ljava/nio/ByteBuffer;II)Ljavax/net/ssl/SSLEngineResult; (ReferenceCountedOpenSslEngine.java:882)
#11 io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap([Ljava/nio/ByteBuffer;[Ljava/nio/ByteBuffer;)Ljavax/net/ssl/SSLEngineResult; (ReferenceCountedOpenSslEngine.java:985)
#12 io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;)Ljavax/net/ssl/SSLEngineResult; (ReferenceCountedOpenSslEngine.java:1028)
#13 io.netty.handler.ssl.SslHandler$SslEngineType$1.unwrap(Lio/netty/handler/ssl/SslHandler;Lio/netty/buffer/ByteBuf;IILio/netty/buffer/ByteBuf;)Ljavax/net/ssl/SSLEngineResult; (SslHandler.java:206)
#14 io.netty.handler.ssl.SslHandler.unwrap(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;II)Z (SslHandler.java:1162)
#15 io.netty.handler.ssl.SslHandler.decode(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;Ljava/util/List;)V (SslHandler.java:1084)
#16 io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;Ljava/util/List;)V (ByteToMessageDecoder.java:489)
#17 io.netty.handler.codec.ByteToMessageDecoder.callDecode(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;Ljava/util/List;)V (ByteToMessageDecoder.java:428)
#18 io.netty.handler.codec.ByteToMessageDecoder.channelRead(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V (ByteToMessageDecoder.java:265)
#19 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(Ljava/lang/Object;)V (AbstractChannelHandlerContext.java:362)
#20 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(Lio/netty/channel/AbstractChannelHandlerContext;Ljava/lang/Object;)V (AbstractChannelHandlerContext.java:348)
#21 io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(Ljava/lang/Object;)Lio/netty/channel/ChannelHandlerContext; (AbstractChannelHandlerContext.java:340)
#22 io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V (DefaultChannelPipeline.java:1334)
#23 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(Ljava/lang/Object;)V (AbstractChannelHandlerContext.java:362)
#24 io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(Lio/netty/channel/AbstractChannelHandlerContext;Ljava/lang/Object;)V (AbstractChannelHandlerContext.java:348)
#25 io.netty.channel.DefaultChannelPipeline.fireChannelRead(Ljava/lang/Object;)Lio/netty/channel/ChannelPipeline; (DefaultChannelPipeline.java:926)
#26 io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read()V (AbstractNioByteChannel.java:134)
#27 io.netty.channel.nio.NioEventLoop.processSelectedKey(Ljava/nio/channels/SelectionKey;Lio/netty/channel/nio/AbstractNioChannel;)V (NioEventLoop.java:644)
#28 io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized()V (NioEventLoop.java:579)
#29 io.netty.channel.nio.NioEventLoop.processSelectedKeys()V (NioEventLoop.java:496)
#30 io.netty.channel.nio.NioEventLoop.run()V (NioEventLoop.java:458)
#31 io.netty.util.concurrent.SingleThreadEventExecutor$5.run()V (SingleThreadEventExecutor.java:858)
#32 io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run()V (DefaultThreadFactory.java:138)
#33 java.lang.Thread.run()V (Thread.java:745)
#34 (Generated Stub)
Previous write of size 8 at 0x7b5400019ff8 by thread T97:
#0 SSL_CTX_set_info_callback .../ssl/ssl_session.c:1136:22 (f077793ecd812aeebb37296c987f655c+0x23bd621)
#1 netty_internal_tcnative_SSL_newSSL .../netty_tcnative/openssl-dynamic/src/main/c/ssl.c:830:5 (f077793ecd812aeebb37296c987f655c+0x2382306)
#2 <null> <null> (0x7fc0760193be)
#3 io.netty.handler.ssl.ReferenceCountedOpenSslEngine.<init>(Lio/netty/handler/ssl/ReferenceCountedOpenSslContext;Lio/netty/buffer/ByteBufAllocator;Ljava/lang/String;IZ)V (ReferenceCountedOpenSslEngine.java:237)
#4 io.netty.handler.ssl.OpenSslEngine.<init>(Lio/netty/handler/ssl/OpenSslContext;Lio/netty/buffer/ByteBufAllocator;Ljava/lang/String;I)V (OpenSslEngine.java:31)
#5 io.netty.handler.ssl.OpenSslContext.newEngine0(Lio/netty/buffer/ByteBufAllocator;Ljava/lang/String;I)Ljavax/net/ssl/SSLEngine; (OpenSslContext.java:49)
#6 io.netty.handler.ssl.ReferenceCountedOpenSslContext.newEngine(Lio/netty/buffer/ByteBufAllocator;Ljava/lang/String;I)Ljavax/net/ssl/SSLEngine; (ReferenceCountedOpenSslContext.java:409)
#7 io.netty.handler.ssl.ReferenceCountedOpenSslContext.newEngine(Lio/netty/buffer/ByteBufAllocator;)Ljavax/net/ssl/SSLEngine; (ReferenceCountedOpenSslContext.java:423)
#8 io.grpc.netty.ProtocolNegotiators$ServerTlsHandler.handlerAdded(Lio/netty/channel/ChannelHandlerContext;)V (ProtocolNegotiators.java:133)
#9 io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(Lio/netty/channel/AbstractChannelHandlerContext;)V (DefaultChannelPipeline.java:597)
#10 io.netty.channel.DefaultChannelPipeline.addLast(Lio/netty/util/concurrent/EventExecutorGroup;Ljava/lang/String;Lio/netty/channel/ChannelHandler;)Lio/netty/channel/ChannelPipeline; (DefaultChannelPipeline.java:226)
#11 io.netty.channel.DefaultChannelPipeline.addLast(Lio/netty/util/concurrent/EventExecutorGroup;[Lio/netty/channel/ChannelHandler;)Lio/netty/channel/ChannelPipeline; (DefaultChannelPipeline.java:392)
#12 io.netty.channel.DefaultChannelPipeline.addLast([Lio/netty/channel/ChannelHandler;)Lio/netty/channel/ChannelPipeline; (DefaultChannelPipeline.java:379)
#13 io.grpc.netty.NettyServerTransport.start(Lio/grpc/internal/ServerTransportListener;)V (NettyServerTransport.java:99)
#14 io.grpc.netty.NettyServer$1.initChannel(Lio/netty/channel/Channel;)V (NettyServer.java:164)
#15 io.netty.channel.ChannelInitializer.initChannel(Lio/netty/channel/ChannelHandlerContext;)Z (ChannelInitializer.java:113)
#16 io.netty.channel.ChannelInitializer.handlerAdded(Lio/netty/channel/ChannelHandlerContext;)V (ChannelInitializer.java:105)
#17 io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(Lio/netty/channel/AbstractChannelHandlerContext;)V (DefaultChannelPipeline.java:597)
#18 io.netty.channel.DefaultChannelPipeline.access$000(Lio/netty/channel/DefaultChannelPipeline;Lio/netty/channel/AbstractChannelHandlerContext;)V (DefaultChannelPipeline.java:44)
#19 io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute()V (DefaultChannelPipeline.java:1387)
#20 io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers()V (DefaultChannelPipeline.java:1122)
#21 io.netty.channel.DefaultChannelPipeline.invokeHandlerAddedIfNeeded()V (DefaultChannelPipeline.java:647)
#22 io.netty.channel.AbstractChannel$AbstractUnsafe.register0(Lio/netty/channel/ChannelPromise;)V (AbstractChannel.java:506)
#23 io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(Lio/netty/channel/AbstractChannel$AbstractUnsafe;Lio/netty/channel/ChannelPromise;)V (AbstractChannel.java:419)
#24 io.netty.channel.AbstractChannel$AbstractUnsafe$1.run()V (AbstractChannel.java:478)
#25 io.netty.util.concurrent.AbstractEventExecutor.safeExecute(Ljava/lang/Runnable;)V (AbstractEventExecutor.java:163)
#26 io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(J)Z (SingleThreadEventExecutor.java:403)
#27 io.netty.channel.nio.NioEventLoop.run()V (NioEventLoop.java:462)
#28 io.netty.util.concurrent.SingleThreadEventExecutor$5.run()V (SingleThreadEventExecutor.java:858)
#29 io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run()V (DefaultThreadFactory.java:138)
#30 java.lang.Thread.run()V (Thread.java:745)
#31 (Generated Stub)
```
thobe
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Jun 29, 2022
…tor (netty#10890) Motivation: A race detector discovered a data race in GlobalEventExecutor present in netty 4.1.51.Final: ``` Write of size 4 at 0x0000cea08774 by thread T103: #0 io.netty.util.internal.DefaultPriorityQueue.poll()Lio/netty/util/internal/PriorityQueueNode; DefaultPriorityQueue.java:113 #1 io.netty.util.internal.DefaultPriorityQueue.poll()Ljava/lang/Object; DefaultPriorityQueue.java:31 #2 java.util.AbstractQueue.remove()Ljava/lang/Object; AbstractQueue.java:113 #3 io.netty.util.concurrent.AbstractScheduledEventExecutor.pollScheduledTask(J)Ljava/lang/Runnable; AbstractScheduledEventExecutor.java:133 #4 io.netty.util.concurrent.GlobalEventExecutor.fetchFromScheduledTaskQueue()V GlobalEventExecutor.java:119 #5 io.netty.util.concurrent.GlobalEventExecutor.takeTask()Ljava/lang/Runnable; GlobalEventExecutor.java:106 #6 io.netty.util.concurrent.GlobalEventExecutor$TaskRunner.run()V GlobalEventExecutor.java:240 #7 io.netty.util.internal.ThreadExecutorMap$2.run()V ThreadExecutorMap.java:74 #8 io.netty.util.concurrent.FastThreadLocalRunnable.run()V FastThreadLocalRunnable.java:30 #9 java.lang.Thread.run()V Thread.java:835 #10 (Generated Stub) <null> Previous read of size 4 at 0x0000cea08774 by thread T110: #0 io.netty.util.internal.DefaultPriorityQueue.size()I DefaultPriorityQueue.java:46 #1 io.netty.util.concurrent.GlobalEventExecutor$TaskRunner.run()V GlobalEventExecutor.java:263 #2 io.netty.util.internal.ThreadExecutorMap$2.run()V ThreadExecutorMap.java:74 #3 io.netty.util.concurrent.FastThreadLocalRunnable.run()V FastThreadLocalRunnable.java:30 #4 java.lang.Thread.run()V Thread.java:835 #5 (Generated Stub) <null> ``` The race is legit, but benign. To trigger it requires a TaskRunner to begin exiting and set 'started' to false, more work to be scheduled which starts a new TaskRunner, that work then needs to schedule additional work which modifies 'scheduledTaskQueue', and then the original TaskRunner checks 'scheduledTaskQueue'. But there is no danger to this race as it can only produce a false negative in the condition which causes the code to CAS 'started' which is thread-safe. Modifications: Delete problematic references to scheduledTaskQueue. The only way scheduledTaskQueue could be modified since the last check is if another TaskRunner is running, in which case the current TaskRunner doesn't care. Result: Data-race free code, and a bit less code to boot.
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This ensures that we propagate asynchronous read failures to Java, and let it handle the failure rather than incorrectly saying that
io_getevents()failed.It also removes the hard-coded sector size so that we can choose to use a different sector size from Apollo. The sector size was only used for verification purposes, using a wrong sector size will simply fail the read asynchronously, so we still detect it. I've verified this with 2 unit tests.