1. gdb files needed, depending on the use of appropriate gdb the device chip, for example, arm-hisiv200-linux-gdb, gdb and the like
2. Copy the symbol table to the device, e.g. core.sym
3.ps viewing thread, pstree -p XXX View child thread, find the need to debug thread
4.gdb mount thread: gdb -p 1236
The import symbol table: symbol-file core.sym
6. a breakpoint, then continue, directly or c
7. operating a run to the location you want to stop
8.bt view the call stack, p view variable