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linux为什么没有生成core dump文件的原因

linux为什么没有生成core dump文件的原因

The core would have been larger than the current limit.
core文件不能超过当前对它的大小限制
You don have the necessary permissions to dump core (directory and file). Notice that core dumps are placed in the dumping process current directory which could be different from the parent process.
你可能没有所需的权限去dump文件
Verify that the file system is writeable and have sufficient free space.
验证文件系统是可写的并且有足够的空间可写
If a sub directory named core exist in the working directory no core will be dumped.
如果你要dump的文件名叫core,而刚好在当前工作目录有个子文件夹目录也叫core,哪就不行
If a file named core already exist but has multiple hard links the kernel will not dump core.
如果有个叫core的文件存在且有多个硬连接也不会dump
Verify the permissions on the executable, if the executable has the suid or sgid bit enabled core dumps will by default be disabled. The same will be the case if you have execute permissions but no read permissions on the file.
还是权限的问题
Verify that the process has not changed working directory, core size limit, or dumpable flag.
验证进程是否改变工作目录,core文件大小限制, dump标志
Some kernel versions cannot dump processes with shared address space (AKA threads). Newer kernel versions can dump such processes but will append the pid to the file name.
一些内核版本不dump共享地址空间限制,新的内核版本可能会在core文件后面加上进程pid
The executable could be in a non-standard format not supporting core dumps. Each executable format must implement a core dump routine.
The segmentation fault could actually be a kernel Oops, check the system logs for any Oops messages.
The application called exit() instead of using the core dump handler.

Check:

$ sysctl kernel.core_pattern

to see how your dumps are created (%e will be the process name, and %t will be the system time).

You can test it by:

sleep 10 &
killall -SIGSEGV sleep

If core dumping is successful, you will see “(core dumped)” after the segmentation fault indication.

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