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([187.14.227.15]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1bdc036a4sm201874285e9.11.2026.10.16.12.56.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Oct 2026 12:56:44 -0700 (PDT) From: Jeremy Dean Clifton To: syzbot+5897b3c764f5989ea942@syzkaller.appspotmail.com Cc: syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org Subject: Re: [syzbot] [bluetooth?] WARNING in hci_connect_sco Date: Fri, 16 Oct 2026 14:57:01 +0000 Message-ID: <20261016145701.105414-1-gservice341@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <694c9ee9.050a0220.35954c.0030.GAE@google.com> References: <694c9ee9.050a0220.35954c.0030.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -1726,8 +1726,15 @@ } cancel_delayed_work(&conn->disc_work); - queue_delayed_work(conn->hdev->workqueue, - &conn->disc_work, timeo); + + /* Pairs with synchronize_rcu() in hci_dev_close_sync(): don't + * queue disc_work while hdev->workqueue is being drained. + */ + rcu_read_lock(); + if (!hci_dev_test_flag(conn->hdev, HCI_CMD_DRAIN_WORKQUEUE)) + queue_delayed_work(conn->hdev->workqueue, + &conn->disc_work, timeo); + rcu_read_unlock(); } }