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Mon, 10 Aug 2026 12:33:44 -0700 (PDT) Message-ID: <5b9c87a351b0a77e1eb36a7ef63abaf3bd172451.camel@gmail.com> Subject: Re: [PATCH bpf-next 1/2] bpf: Account for preempt and IRQ state in RCU protection From: Eduard Zingerman To: Ning Ding , bpf@vger.kernel.org Cc: memxor@gmail.com, puranjay@kernel.org, paulmck@kernel.org, Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , linux-kernel@vger.kernel.org Date: Mon, 10 Aug 2026 12:33:41 -0700 In-Reply-To: References: <20260805233940.3966981-1-dingning04@gmail.com> <20260805233940.3966981-2-dingning04@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-10 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-08-10 at 12:30 -0700, Eduard Zingerman wrote: > On Wed, 2026-08-05 at 16:39 -0700, Ning Ding wrote: > > Disabling preemption or local IRQs keeps the current CPU in an RCU > > read-side critical section, but in_rcu_cs() does not account for either > > state. The verifier therefore rejects safe kptr accesses and invalidate= s > > pointers when another RCU source ends. > >=20 > > Include preemption-disabled and IRQ-disabled state in in_rcu_cs(). > > Invalidate RCU-protected pointers on RCU unlock, preempt enable, or IRQ > > restore only after the final protection ends. > >=20 > > Signed-off-by: Ning Ding > > --- >=20 > Hi Ning, >=20 > Thank you for identifying and fixing this issue! >=20 > Acked-by: Eduard Zingerman >=20 > ... Please disregard the above email, it was meant for the "bpf: Compare iterator types during state pruning" series.