How do I use SystemTap to track all kernel function calls? kernel crash while systemtap probe all kernel funciotns

kernel crash while systemtap probe all kernel funciotns

// all.stpglobal tar = "fork";probe begin{   printf("===ready===\n");     }probe kernel.function("*"){   if(execname() == tar){        printf("%s\n", ppfunc());        }}

stap all.stap wait to ready. And then run the fork process. It crashed after a while.