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Wed, 16 Sep 2026 06:32:25 -0700 (PDT) From: Donglin Peng To: rostedt@goodmis.org Cc: mhiramat@kernel.org, dolinux.peng@gmai.com, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, pengdonglin Subject: [PATCH v6 1/4] tracing: Avoid BTF lookup in atomic context Date: Wed, 16 Sep 2026 21:32:15 +0800 Message-Id: <20260916133218.1282590-2-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260916133218.1282590-1-dolinux.peng@gmail.com> References: <20260916133218.1282590-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: pengdonglin The function graph trace formatter can be called from ftrace_dump_one() with interrupts disabled. When ftrace_dump_on_oops is enabled, the trace panic notifier can reach ftrace_dump() from the panic path, including the nmi_panic() path used by the hard lockup detector. btf_find_func_proto() calls bpf_find_btf_id(), which may initialize vmlinux BTF under a mutex. Skip the BTF lookup when running in an atomic context or with interrupts disabled, and fall back to the existing return value formatting. Fixes: ebeed8d4a555 ("tracing/probes: Move finding func-proto API and getting func-param API to trace_btf") Signed-off-by: pengdonglin --- kernel/trace/trace_btf.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/trace/trace_btf.c b/kernel/trace/trace_btf.c index 00172f301f25..ae562192b619 100644 --- a/kernel/trace/trace_btf.c +++ b/kernel/trace/trace_btf.c @@ -15,6 +15,9 @@ const struct btf_type *btf_find_func_proto(const char *func_name, struct btf **b const struct btf_type *t; s32 id; + if (unlikely(in_atomic() || irqs_disabled())) + return NULL; + id = bpf_find_btf_id(func_name, BTF_KIND_FUNC, btf_p); if (id < 0) return NULL; -- 2.34.1