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Sat, 10 Jan 2026 14:12:48 -0800 (PST) Received: from newman.cs.purdue.edu ([128.10.127.250]) by smtp.gmail.com with ESMTPSA id 00721157ae682-790aa57ceb5sm54625467b3.17.2026.01.10.14.12.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jan 2026 14:12:47 -0800 (PST) From: Jiasheng Jiang To: Song Liu , Yu Kuai Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, Jiasheng Jiang Subject: [PATCH] md: fix hang in stop_sync_thread by setting THREAD_WAKEUP in md_wakeup_thread_directly Date: Sat, 10 Jan 2026 22:12:44 +0000 Message-Id: <20260110221244.14304-1-jiashengjiangcool@gmail.com> X-Mailer: git-send-email 2.25.1 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" Analysis of md.c shows that the md_thread() loop relies on the THREAD_WAKEUP bit being set to progress beyond wait_event(). However, md_wakeup_thread_directly() currently only calls wake_up_process() without setting this bit. As a result, a thread woken by md_wakeup_thread_directly() will find the wait condition remains False and immediately return to sleep without executing its run() handler. In the case of stop_sync_thread(), this causes the sync thread to ignore the interruption request, leading to a permanent hang. Fix this by ensuring the THREAD_WAKEUP bit is set before waking the process in md_wakeup_thread_directly(). Signed-off-by: Jiasheng Jiang --- drivers/md/md.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 6d73f6e196a9..8709e9fd7f39 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8512,8 +8512,10 @@ static void md_wakeup_thread_directly(struct md_thre= ad __rcu **thread) =20 rcu_read_lock(); t =3D rcu_dereference(*thread); - if (t) + if (t) { + set_bit(THREAD_WAKEUP, &t->flags); wake_up_process(t->tsk); + } rcu_read_unlock(); } =20 --=20 2.25.1