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Fri, 13 Feb 2026 08:48:39 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Fri, 13 Feb 2026 17:48:36 +0100 To: Mykyta Yatsenko Cc: Ihor Solodrai , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Amery Hung , Mykyta Yatsenko , Alexis =?iso-8859-1?Q?Lothor=E9?= , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH bpf-next v1 09/14] selftests/bpf: Fix double thread join in uprobe_multi_test Message-ID: References: <20260212011356.3266753-1-ihor.solodrai@linux.dev> <20260212011356.3266753-10-ihor.solodrai@linux.dev> <5de2e9e7-2898-49a8-ba1a-253dceddeedd@gmail.com> 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: <5de2e9e7-2898-49a8-ba1a-253dceddeedd@gmail.com> On Thu, Feb 12, 2026 at 02:49:09PM +0000, Mykyta Yatsenko wrote: > On 2/12/26 01:13, Ihor Solodrai wrote: > > ASAN reported a "joining already joined thread" error. The > > release_child() may be called multiple times for the same struct > > child. > > > > Fix by setting child->thread to 0 after pthread_join. > > > > Signed-off-by: Ihor Solodrai > > --- > > tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c > > index 2ee17ef1dae2..17881e009eee 100644 > > --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c > > +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c > > @@ -62,8 +62,10 @@ static void release_child(struct child *child) > > return; > > close(child->go[1]); > > close(child->go[0]); > > - if (child->thread) > > + if (child->thread) { > > pthread_join(child->thread, NULL); > > + child->thread = 0; > > + } > > close(child->c2p[0]); > > close(child->c2p[1]); > > if (child->pid > 0) > As far as I understand the problem is due to `static struct child child` in > the test_attach_api(), once we initialize thread field of the child > it's not reset before the next test run. > Maybe we should also add memset(&child, 0, sizeof(child)); > in test_attach_api() before each test to make sure all fields are reset. right, perhaps we could do memset right away in release_child, jirka > > Acked-by: Mykyta Yatsenko >