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Fri, 10 Jul 2026 15:15:34 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Sat, 11 Jul 2026 00:15:33 +0200 To: Leon Hwang Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Emil Tsalapatis , Shuah Khan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-patches-bot@fb.com Subject: Re: [PATCH bpf-next 1/2] bpf: Mark tracing_multi trampolines as ftrace managed Message-ID: References: <20260710144734.78203-1-leon.hwang@linux.dev> <20260710144734.78203-2-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260710144734.78203-2-leon.hwang@linux.dev> On Fri, Jul 10, 2026 at 10:47:33PM +0800, Leon Hwang wrote: > Since tracing_multi link does not set ftrace_managed, it would fail to > release the tracing_multi link when attaching tracing_multi link and > then attaching fentry link. > > [ 3.714215] WARNING: kernel/bpf/trampoline.c:1727 at bpf_trampoline_multi_detach+0x20b/0x240, CPU#1: test_progs/97 > ... > [ 3.733170] bpf_tracing_multi_link_release+0x14/0x30 > [ 3.733890] bpf_link_free+0x58/0x130 > [ 3.734414] bpf_link_release+0x23/0x30 > > Fix it by setting 'ftrace_managed = true' in register_fentry_multi(). > > Fixes: aef4dfa790b2 ("bpf: Add bpf_trampoline_multi_attach/detach functions") > Signed-off-by: Leon Hwang > --- > kernel/bpf/trampoline.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c > index 1a721fc4bef5..6eadf64f7ec9 100644 > --- a/kernel/bpf/trampoline.c > +++ b/kernel/bpf/trampoline.c > @@ -1536,6 +1536,7 @@ static int register_fentry_multi(struct bpf_trampoline *tr, struct bpf_tramp_ima > if (bpf_trampoline_use_jmp(tr->flags)) > addr = ftrace_jmp_set(addr); > > + tr->func.ftrace_managed = true; I wonder we could set tr->func.ftrace_managed early in bpf_trampoline_get, but we could do that as follow up Acked-by: Jiri Olsa thanks, jirka > ftrace_hash_add(data->reg, data->entry, ip, addr); > tr->cur_image = im; > return 0; > -- > 2.55.0 >