On Tue, May 16, 2023 at 03:18:28PM +0800, Ze Gao wrote: > Current implementation calls kprobe related functions before doing > ftrace recursion check in fprobe_kprobe_handler, which opens door > to kernel crash due to stack recursion if preempt_count_{add, sub} > is traceable. Which preempt_count*() are you referring to? The ones you just made _notrace in the previous patch?