child->ptrace &= ~PT_DTRACE; child->thread.singlestep_syscall = 0; 
set_singlestepping(child,0); 
void ptrace_disable(struct task_struct *child){ 	child->ptrace &= ~PT_DTRACE;	child->thread.singlestep_syscall = 0;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/82c1c11bdd92d94f8fd620a3ea6c894eba37d4ed/ptrace.c/buggy/arch/um/kernel/ptrace.c