#Code on time crashes browser code#
This distance is tunable, so that applications with native code needing more than the default distance can increase the shadow page size. The size of the shadow pages is between 3 and 20 pages, depending on the platform. The distance toward the end of the stack is called shadow pages. Java methods generate code that checks whether the stack space is available at a fixed distance towards the end of the stack so that the native code can be called without exceeding the stack space. In the HotSpot implementation, Java methods share stack frames with C/C++ native code, namely user native code and the virtual machine itself. This is a fatal error that causes the process to terminate. On the other hand, C and C++ write beyond the end of the stack and cause a stack overflow. Depending on the OS, the native debugger is dbx, gdb, or windbg. You can troubleshoot a crash in a native application library by attaching the native debugger to the core file or crash dump, if it is available. You can find JRE libraries in the jre/lib or jre/bin directories of the JRE distribution. If so, gather as much data as possible, and submit a bug or report, indicating the library name. If the native library where the crash occurred is part of the Java Runtime Environment (JRE) (for example awt.dll, net.dll, and so forth), then it is possible that you encountered a library or API bug. If the native library has been provided by another vendor and is used by your application, then file a bug report against this third-party application and provide the fatal error log information. A significant number of issues with JNI code can be identified by running the application with the -Xcheck:jni option added to the command line. If the native library is provided by your application, then investigate the source code of your native library. The first step to solving a crash in a native library is to investigate the source of the native library where the crash occurred. In this case, although the problematic frame is a VM frame, the thread stack shows that a native routine in App.dll has called into the VM (probably with JNI). Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)Ĭ <= C/native frame T H R E A D -Ĭurrent thread (0x00036960): JavaThread "main" # Java VM: Java HotSpot(TM) Client VM (1.5-internal mixed mode) Consider the crash in the following example where a JavaThread fails while in the _thread_in_vm state (meaning that it is executing in Java VM code). In some cases a bug in a native library manifests itself as a crash in Java VM code. In this case a SIGSEGV occurred with a thread executing in the library libApplication.so. # Java VM: Java HotSpot(TM) Server VM (6-beta2-b63 mixed mode) # An unexpected error has been detected by HotSpot Virtual Machine: Consider the extract in the following example from the header of a fatal error log. The crash could be caused by something else, but analysis of the library and any core file or crash dump is a good starting place. If the fatal error log indicates the problematic frame to be a native library, then there might be a bug in the native code or the Java Native Interface (JNI) library code. Microsoft Visual C++ Version Considerations This chapter contains the following sections:
#Code on time crashes browser how to#
See Fatal Error Log for an explanation of how to locate this file, as well as a detailed description of the file. This is a text file that the Java HotSpot VM generates in the event of a crash. In general, the first step with any crash is to locate the fatal error log. This chapter provides suggestions about how to examine a crash and work around some of the issues (if possible) until the cause of the bug is diagnosed and fixed. External factors, such as resource exhaustion in the OS can also cause a crash.Ĭrashes caused by bugs in the Java HotSpot VM or in the Java SE library code are rare. For example, a crash can occur due to a bug in the Java HotSpot VM, in a system library, in a Java SE library or an API, in application native code, or even in the operating system (OS). There are various possible reasons for a crash. Information and guidance about some specific procedures for troubleshooting system crashes.Ī crash, or fatal error, causes a process to terminate abnormally.
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