简要说明：使用 dump_stack() 打印内核里的堆栈信息。

Purpose

dump_stack() function which will give you a call trace. This function is not enabled in the default kernel and must be enabled. This article will cover how to enable and use the dump_stack()

Enabling in Kernel Config

dump_stack() function in the kernel config the following options must be set. You can use make menuconfig or make xconfig to do this.

  1. Kernel hacking -> Kernel debugging
  2. Kernel hacking -> Verbose kernel error messages

dump_stack()

You need to rebuild your Linux kernel image after enabling these options.

Using dump_stack()

dump_stack() function is as easy as calling dump_stack() wherever you wish to print out the stack. This will cause a stack trace to be printed at that point.

Conclusion

This is a useful way to print out the stack while leaving the kernel unharmed.