From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out162-62-57-137.mail.qq.com (out162-62-57-137.mail.qq.com [162.62.57.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF8431F5842 for ; Wed, 12 Aug 2026 04:42:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=162.62.57.137 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786509750; cv=none; b=M2NfYxzGsbhviaXQ1+cVW6GVjkJTRrKc31Iq7q8btjnNKhLOhSb2wwmmH5/SWVUWIX5sD3BidqTLo9XEtmjnq2cOfSXZKNWOI1MXnpFtOe4L5Heu5v9wIj+tOkOKOBx6pNxk60wXSi9MjnBaAUOo7jPX/TOE8bPUCq9bPTsYx20= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786509750; c=relaxed/simple; bh=9YoyDHsQAmFGvAs9HVWoSPxWxf/TNoH9+oYGnZxIabw=; h=Message-ID:From:To:Cc:Subject:Date:In-Reply-To:References: MIME-Version; b=tXNqL0mJYs1wxNQS4nYn4A1Akbq5ol0d/S3KC30W+ubP7YuEfFU+VouLOQozsrcPTVPRFFoeyxBYu884nvXpk0j2ZrHY19w7EyVv5b3XAgTJz5PjBVdcbzveqv1jFmnwJ1WwMm9x+7HCcwXXVu8jvuR0DoAvEgfeON3lOpi1tJk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com; spf=pass smtp.mailfrom=qq.com; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b=ZiU2GJNe; arc=none smtp.client-ip=162.62.57.137 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qq.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b="ZiU2GJNe" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qq.com; s=s201512; t=1786509741; bh=+or+rBQw+QAtYd7mhOOo6LRN7RBYENZ1ZFhLH58aJ2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZiU2GJNeJ2919d32E3Jn5FrjdjHf6yEVUz2nc18mgw3OTP4wKmSJiw3tglPswiCDI 718od0QZOcK8fqeX6kysUCbix/1WacYG+Q7IL63RBpVW+AH4UQGl8aG4aMNA0usDC1 qOfVJ9EYiUhd+OFhKoPkby+92sZVUOGlRDhmzWjw= Received: from lxu-ped-host.. ([111.198.231.89]) by newxmesmtplogicsvrsza63-0.qq.com (NewEsmtp) with SMTP id A938A090; Wed, 12 Aug 2026 12:42:19 +0800 X-QQ-mid: xmsmtpt1786509739t8rj8mej0 Message-ID: X-QQ-XMAILINFO: NGZp1yYNf7Y+H5fJDaaCK62jJEDVXB/6zbZ2mnX3OaL491jSvC2nckROOF8eYx HvEv1fOF7eLzqnW98STIlPBStmhMEoFRlmbjWOQlHdd1Rf/kYBD3yjA6tNqbKXb+UWjv198zMEJ5 o2Unwh1uMLJA01MBROrwtAzVdZ+PXkE0fuM4XWro+0zcIvsEROdnTiDyDkFTENXVXhJ8PN9Zm7GF CGM5Zz8Hxotx6POPuH2Oz330QmtUU4rDKoSqXtG7msRir3/u2OsIPpm18tLWNFbI2AlwGOXJyySc OI29aWzKTGEd21tUs1R1CtWOcEicW97rgOdutFGDlk9QJlcL9DgihxHEd2VD+pyb6k56dBKRi6x+ ZppoUfOGedGr5gBjikxm0GSvoqNEXMuWSJ2i6fLB+Sui4DmfO6b11caUGQHTF69FiTIPhqLdqsyV azMUqz1vkI5rKUBFZqbSR3VDWyCUjisuUxeNmlckIlt2jhaKjYHofaDTi79w/7HGV32jgCUeWle/ n9VNgvRiyyHtpCpCJS30XpKZEXy3Rc+s7aB8zfBgoJCUxpVY1OKq3J3g7qb9MT9cmqtazgiofdIU YniQYJMVAi3HxSGctFRuw40AnysKAmqbNIJdrTCy6aOumSYg3NQrMLt6WcLeesn+azcUk1C7P/kI D8DDAT2SrD44suhaYx5XWeQpX8sZ8FMBgAkGp6KBVZVGD9DRk/0yAzdc7EhAfwjuIa05Un3DPOIp WZsVO4DumRgSLRYuXJ7UXn8SmkBZKfJexH4NWfvPltqLKDNZf4EYUwZrbC85VVLfarYhC64cJ4GT wfuyvIYZ2aFh0JqD2KlXFK81slFqiMXxdqWtP8M99dLz3aDtNyWq1uY+TH96RdD4VUHqpa7ko/NX ZBJd/vI7gaoAFIldXtC/C35Z1HFhNpiyDPsd8Lb4hQxrh2svH+kYCCuLEqsKpVLg1EpF06/P/HQd vatcUFf1xx/1wkdSdMMLerD5z9dzE6iRIRF6ok8MLdqcN62qebxS3aHkmdlgduQaiLNHta9mmXKM QgzdRY5A== X-QQ-XMRINFO: M/715EihBoGS47X28/vv4NpnfpeBLnr4Qg== From: Edward Adam Davis To: syzbot+a43f81e0646c5bbd2b88@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [io-uring?] [net?] WARNING: refcount bug in zcrx_unregister_user Date: Wed, 12 Aug 2026 12:42:20 +0800 X-OQ-MSGID: <20260812044219.132911-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <6a7bbccb.ac361c09.22ff0a.0048.GAE@google.com> References: <6a7bbccb.ac361c09.22ff0a.0048.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 diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index f1464ea8ca64..2dbddf80244d 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -567,11 +567,10 @@ static void io_close_queue(struct io_zcrx_ifq *ifq) .mp_priv = ifq, }; - scoped_guard(mutex, &ifq->pp_lock) { - netdev = ifq->netdev; - netdev_tracker = ifq->netdev_tracker; - ifq->netdev = NULL; - } + guard(mutex)(&ifq->pp_lock); + netdev = ifq->netdev; + netdev_tracker = ifq->netdev_tracker; + ifq->netdev = NULL; if (netdev) { if (ifq->if_rxq != -1) {