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[37.27.107.159]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a15636ef2bsm1160099e87.84.2026.03.12.15.14.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2026 15:14:27 -0700 (PDT) From: Josh Law X-Google-Original-From: Josh Law To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Josh Law Subject: [PATCH v1 1/2] lib/lwq: fix potential kthread_stop() hang in test Date: Thu, 12 Mar 2026 22:14:26 +0000 Message-Id: <20260312221427.75011-2-objecting@objecting.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260312221427.75011-1-objecting@objecting.org> References: <20260312221427.75011-1-objecting@objecting.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Josh Law Check kthread_should_stop() in lwq_exercise()'s wait_var_event() so the thread can exit cleanly when kthread_stop() is called while the queue is empty. Signed-off-by: Josh Law --- lib/lwq.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lib/lwq.c b/lib/lwq.c index c1e11ba6f254..1fd2ed612c75 100644 --- a/lib/lwq.c +++ b/lib/lwq.c @@ -86,7 +86,10 @@ static int lwq_exercise(void *qv) struct tnode *t; =20 for (cnt =3D 0; cnt < 10000; cnt++) { - wait_var_event(q, (t =3D lwq_dequeue(q, struct tnode, n)) !=3D NULL); + wait_var_event(q, (t =3D lwq_dequeue(q, struct tnode, n)) !=3D NULL || + kthread_should_stop()); + if (!t) + break; t->c++; if (lwq_enqueue(&t->n, q)) wake_up_var(q); --=20 2.34.1