A global core file path, which defaults to core and is disabled by default. If enabled, an additional core file with the same content as the per-process core file is produced by using the global core file path.
Non-privileged users cannot view this file. The name of a core file contains fields with information about the failed process. For a full description of the core file name fields, see the coreadm 8 man page. This section focuses on the global variables. If a global core file directory is enabled, core files can be distinguished from one another by using the following variables:. Decimal value of time 2. When collecting a core dump, be sure to gather other information about the environment so that the core file can be analyzed for example, OS version, patch information, and the fatal error log.
Core dumps do not usually contain all the memory pages of the crashed or hung process. With each of the operating systems discussed here, the text or code pages of the process are not included in core dumps.
But to be useful, a core dump must consist of pages of heap and stack as a minimum. Collecting non-truncated good core dump files is essential for postmortem analysis of the crash. With the Oracle Solaris operating system, unhandled signals such as a segmentation violation, illegal instruction, and so forth, result in a core dump.
By default, the core dump is created in the current working directory of the process and the name of the core dump file is core. The user can configure the location and name of the core dump using the core file administration utility, coreadm. This procedure is fully described in the man page for the coreadm utility.
The ulimit utility is used to get or set the limitations on the system resources available to the current shell and its descendants. Use the ulimit -c command to check or set the core file size limit.
Make sure that the limit is set to unlimited ; otherwise the core file could be truncated. Ensure that any scripts that are used to launch the VM or your application do not disable core dump creation. The gcore utility can be used to get a core image of running processes.
This utility accepts a process id pid of the process for which you want to force core dump. To get the list of Java processes running on the machine, you can use any of the following commands:. When a fatal error is encountered, the process prints a message to standard error and waits for a yes or no response from standard input. Example shows the output when an unexpected signal occurs. Then you can type yes to launch the dbx debugger.
This Oracle Solaris operating system utility is used to trace system calls and signals. You can use this utility to suspend the process when it reaches a specific function or system call. The command in Example shows how to use the truss utility to suspend a process when the exit system call is executed in other words, the process is about to exit.
When the process calls exit , it will be suspended. At this point, you can attach the debugger to the process or call gcore to force a core dump. On the Linux operating system, unhandled signals such as segmentation violation, illegal instruction, and so forth, result in a core dump.
You can use the gcore command in the gdb GNU Debugger interface to get a core image of a running process. This utility accepts the pid of the process for which you want to force the core dump. Type yes to launch the gdb GNU Debugger interface, as suggested by the error report shown above. If enabled, an additional core file with the same content as the per-process core file is produced by using the global core file path. Non-privileged users cannot view this file. When a process terminates abnormally, it produces a core file in the current directory by default.
If the global core file path is enabled, each abnormally terminating process might produce two files, one in the current working directory, and one in the global core file location. By default, a setuid process does not produce core files using either the global or per-process path.
If a global core file directory is enabled, core files can be distinguished from one another by using the variables that are described in the following table. You can set a core file name pattern on a global, zone, or per-process basis.
In addition, you can set per-process defaults that persist across a system reboot. For example, the following coreadm command sets the default per-process core file pattern.
This setting applies to all processes that have not explicitly overridden the default core file pattern. This setting persists across system reboots. For example, the following coreadm command sets the global core file pattern for all processes that are started by the init process.
This pattern will persist across system reboots. The following coreadm command sets the per-process core file name pattern for any processes:. The per-process core file name pattern is inherited by all child processes.
Core files are generated when a process or application terminates abnormally. Core files are managed with the coreadm command. For example, you can use the coreadm command to configure a system so that all process core files are placed in a single system directory. This means it is easier to track problems by examining the core files in a specific directory whenever a process or daemon terminates abnormally.
Two new configurable core file paths that can be enabled or disabled independently of each other are:. A per-process core file path, which defaults to core and is enabled by default. If enabled, the per-process core file path causes a core file to be produced when the process terminates abnormally. The per-process path is inherited by a new process from its parent process.
Only the owning user can view this file. A global core file path, which defaults to core and is disabled by default. If enabled, an additional core file with the same content as the per-process core file is produced by using the global core file path. Non-privileged users cannot view this file. When a process terminates abnormally, it produces a core file in the current directory by default.
If the global core file path is enabled, each abnormally terminating process might produce two files, one in the current working directory, and one in the global core file location. By default, a setuid process does not produce core files using either the global or per-process path. If a global core file directory is enabled, core files can be distinguished from one another by using the variables described in the following table.
You can set a core file name pattern on a global, zone, or per-process basis. In addition, you can set the per-process defaults that persist across a system reboot.
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