arm系統下coredump生成空文件，文件大小為0的原因

參考：https://stackoverflow.com/questions/13403824/empty-core-dump-file-after-segmentation-fault

1.受限要開啟coredump的大小限制。ulimit -c unlimited

2.core文件不能在掛在分區生成，必須放到本地分區上。

If you run the core file in a mounted drive.The core file can't be written to a mounted drive but must be written to the local drive.

https://stackoverflow.com/questions/13403824/empty-core-dump-file-after-segmentation-fault