Re: [RFC v3 2/2] arm64: kprobes: Allow reentering kprobes while single-stepping

Will Deacon <[email protected]>
Newsgroups org.kernel.vger.linux-trace-kernel,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel
Message-ID <aljbf_RmOd9U2KDT@willie-the-truck> 
On Fri, Jul 10, 2026 at 06:32:55AM +0000, Pu Hu wrote:
> From: Pu Hu <[email protected]>
> 
> A kprobe can be hit while another kprobe is in KPROBE_HIT_SS state. This
> can happen when tracing or perf code runs from the debug exception path
> while the first kprobe is preparing or executing its out-of-line
> single-step instruction.

I don't understand this part. The single-step runs with debug exceptions
disabled (kprobes_save_local_irqflag() sets PSTATE.D) so how do we end
up taking one?

Will
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