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  • <div><p>The method is not synchronized; more than one thread could create and insert a CommandMapper: <p>public static CommandMapper getInstance(String instanceName) { CommandMapper cm =...
  • <ul><li>Adding unit tests for edge condition involving <code>unsafe</code> code paths</li><li>Refactoring the code involving <code>unsafe</code> into smaller leaf modules that present a safe wrapper ...
  • <div><p>This prevents a problem that caused an unsafe start of his system. <p>Arming while in autonomous modes (e.g. RTH, PH, AH) can allow unexpected behavior and is certainly an untested path. This ...
  • 我的一个应用程序在一段负载运行的时间内挂起,有谁知道在jstack中可能会导致这样的输出:"scheduler-5" prio=10 tid=0x00007f49481d0000 nid=0x2061 waiting on condition [0x00007f494e8d0000]java.lang.Thread....

    我的一个应用程序在一段负载运行的时间内挂起,有谁知道在jstack中可能会导致这样的输出:

    "scheduler-5" prio=10 tid=0x00007f49481d0000 nid=0x2061 waiting on condition [0x00007f494e8d0000]

    java.lang.Thread.State: WAITING (parking)

    at sun.misc.Unsafe.park(Native Method)

    - parking to wait for <0x00000006ee117310> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)

    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)

    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)

    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1085)

    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)

    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1043)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1103)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

    at java.lang.Thread.run(Thread.java:722)

    在挂起时,我在jstack输出中看到很多。

    我大量使用Spring @Async&地图,同步地图和ehcache。

    有趣的是只在一个应用程序实例上发生。两个人跑得很好。

    在这种情况下,还可以调查哪些更多细节?

    展开全文
  • 我的一个应用程序在负载下运行一段时间后挂起,有人知道是什么会导致jstack中的此类输出:"scheduler-5" prio=10 tid=0x00007f49481d0000 nid=0x2061 waiting on condition [0x00007f494e8d0000]java.lang.Thread....

    我的一个应用程序在负载下运行一段时间后挂起,有人知道是什么会导致jstack中的此类输出:

    "scheduler-5" prio=10 tid=0x00007f49481d0000 nid=0x2061 waiting on condition [0x00007f494e8d0000]

    java.lang.Thread.State: WAITING (parking)

    at sun.misc.Unsafe.park(Native Method)

    - parking to wait for <0x00000006ee117310> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)

    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)

    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)

    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1085)

    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)

    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1043)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1103)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

    at java.lang.Thread.run(Thread.java:722)

    我在挂起的jstack输出中看到了很多。

    我大量使用Spring @Async和地图,同步地图和ehcache。

    有趣的是,这仅发生在一个应用实例上。另外两个运行得很好。在这种情况下,我还能进行哪些调查以获取更多详细信息?

    展开全文
  • Fix race condition

    2021-01-08 23:36:34
    <div><p>Fix race condition on assignment of imports to unsafe parserConfiguration field. <p><a href="https://issues.jboss.org/browse/DROOLS-1359">DROOLS-1359</a></p><p>该提问来源于开源项目:...
  • <p>expose an API that is unsafe wrt to concurrent modifications of the head tracker. <h2>Version <p>3cfd70d7fd290a9f293d6d869bade90aba6c95ae <h2>Present Behaviour <p>Forks pruning deletes entries from...
  • <div><p>Hello, I think there might be a race condition in <code>Sum64String</code> which could be mitigated with a minor change. The gist of the issue is that Go's garbage collector can collect ...
  • /var/folders/l6/t4tq5tcx7fg0ddglrbgk5hxm0000gn/T/rules_go_work-492090240/_cgo_gotypes.go:425:8: tautological condition: nil == nil /var/folders/l6/t4tq5tcx7fg0ddglrbgk5hxm0000gn/T/rules_go_...
  • <div><p>Visibility and race condition problems: <p>public static AppclientJWSSupportManager getInstance() { if (instance == null) { instance = new AppclientJWSSupportManager(); if ...
  • <div><p>While digging through the code I spotted a race condition in CurlHandleContainer::CheckAndGrowPool() -- it can be called by multiple threads at the same time and updates it's state in an ...
  • <p>Visibility and race condition issues: <p>public static MappingQueryServiceFactory getInstance() <p>{ if (instance == null) instance = new MappingQueryServiceFactory(); return instance; ...
  • <p>Visibility and race condition problems: <p>public static ASMBeanDiscoveryServiceFactory getInstance() <p>{ if (instance == null) instance = new ASMBeanDiscoveryServiceFactory(); return ...
  • <p>Visibility and race condition problems: <p>public static CMMMBeanDiscoveryServiceFactory getInstance() <p>{ if (instance == null) instance = new CMMMBeanDiscoveryServiceFactory(); ...
  • <p>Visibility and race condition issues: <p>public static RelationMappingServiceFactory getInstance() <p>{ if (instance == null) instance = new RelationMappingServiceFactory(); return ...
  • <p>Visibility and race condition problems: <p>public static ServiceEngineObjectFactoryImpl getInstance() <p>{ if(factoryObj == null) factoryObj = new ServiceEngineObjectFactoryImpl(); ...
  • <p>Visibility and race condition problems: <p>public static JavaEEServiceEngineContext getInstance() <p>{ if (serviceEngineContext == null) serviceEngineContext = new ...
  • <p>Visibility and race-condition problems: <p>public static LBDeregistrationUtil getInstance(MBeanServer mbs) <p>{ if (mUtil == null) mUtil = new LBDeregistrationUtil(mbs); return mUtil; }...
  • <p>Visibility and race condition problems: <p>public static TableAccessObject getInstance() <p>{ if(_singletonRE == null) _singletonRE = new RequestEndAccessObjectImpl (); return _...
  • <p>Visibility and race condition problems: <p>public static EndpointHelper getInstance() { if (helper == null) <p>{ helper = new EndpointHelper(); } <p>return helper; } <h4>Environment <p>...
  • <p>Visibility and race condition problem: <p>public static ServiceEngineFacadeImpl getInstance() { if (facade == null) <p>{ facade = new ServiceEngineFacadeImpl(); } <p>return facade; } ...
  • <p>Visibility and race condition problems: <p>static MessageTraceFactory getInstance() { if (_instance == null) <p>{ _instance = new MessageTraceFactory(); } <p>return _instance; } <h4>...
  • <p>Visibility and race condition problems: <p>public static TransformMgr getInstance() { if (_instance == null) <p>{ _instance = new TransformMgr(); } <p>return _instance; } <h4>...
  • <p>Visibility and race condition problems: <p>public static MessageTraceMgr getInstance() { if (_instance == null) <p>{ _instance = new MessageTraceMgr(); } <p>return _instance; } <h4>...
  • <p>Visibility and race condition problems: <p>public static ConnectionRegistry getInstance() { if (_instance == null) <p>{ _instance = new ConnectionRegistry(); } <p>return _instance; } ...
  • <p>Visibility and race condition isssues: <p>static TrashCleaner getInstance(File trash) { if (_instance == null) <p>{ _instance = new TrashCleaner(trash); } <p>return _instance; } <h4>...
  • <p>Visibility and race condition problems: <p>public static final AsyncHandlerIntf getInstance (){ if (_singleton == null) <p>{ _singleton = new AsyncHandlerProducer (); } <p>return _...
  • - bad RX failsafe/initial state (default arm position unsafe) - arming switch left in on position and no prearm configured during boot - arming switch accidentally switch to on whilst carrying radio ...
  • If a signal interrupts the execution of an unsafe function, and handler calls an unsafe function, then the behavior of the program is undefined." <pre><code> C void sigWinChCatcher(int signum) { ...
  • The m_lRefCount assignment is not necessary at all and introduces a race condition. If thread1 executes InterlockedIncrement and then another thread2 increments m_lRefCount before the thread1 executes...

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