From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 51AB93D605C; Thu, 8 Jan 2026 10:08:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767866937; cv=none; b=hH7JYwoECs03GYXr3g+kreRqE1SAA3Hz9IztPE1qgEuegxDZDJUcUjtofuHqUeVUzVykX16snYxnFfptfK6hiypibqxhucDAbft/Dvr2BDjo2Jw0it/wRzPRqF3ANITDbtKRpOj85z81aP0QzESiyss9v7wJgVaEHCGqIgBPnVY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767866937; c=relaxed/simple; bh=kWBrEl9Yf0lKqjUjkxR3fjkBSItC7QpKJFB09llNT8E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=MKLa9lfVGXZePIC6gQ3jjOs8719JNeVGX4lFdptj4Joje+KgRMZbl4n+S4WXygSgCFDwUAgcp7uQdehU+22b7jBtcX5sTugeFp46n0Vdz6ANm2dh7ng2arTUG8hkYUDq+JNorJXknOCa9gfOZ2P/CFfs4G13DLgFaQ0AWEhzn5g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1f9RFGao; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="1f9RFGao" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 284D8C116C6; Thu, 8 Jan 2026 10:08:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767866936; bh=kWBrEl9Yf0lKqjUjkxR3fjkBSItC7QpKJFB09llNT8E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=1f9RFGaoEe8i0zFCsDza2R7t5/gIkIoPSSIs4zW3RRPN9QEpnYjcD8OzH8QieE3Ie S54AfUUDc6skvLMJAgy8aNXAsbdj3x5+H9qLC/ol36x38qAPrVdeWjt+dIHql7oDZl Sp6fk+r8VuZGLJo3ieLppusgdp3Dn0YljqqpsJAo= Date: Thu, 8 Jan 2026 11:08:53 +0100 From: Greg KH To: Rahul Sharma Cc: stable@vger.kernel.org, linux-kernel@vger.kernel.org, Zqiang , Jakub Kicinski , Paolo Abeni Subject: Re: [PATCH v6.12] usbnet: Fix using smp_processor_id() in preemptible code warnings Message-ID: <2026010838-epidural-reflex-d9e7@gregkh> References: <20260107081855.743357-1-black.hawk@163.com> Precedence: bulk X-Mailing-List: stable@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: <20260107081855.743357-1-black.hawk@163.com> On Wed, Jan 07, 2026 at 04:18:55PM +0800, Rahul Sharma wrote: > From: Zqiang > > Syzbot reported the following warning: > > BUG: using smp_processor_id() in preemptible [00000000] code: dhcpcd/2879 > caller is usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 > CPU: 1 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-00098-g615dca38c2ea #0 PREEMPT(voluntary) > Call Trace: > > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 > check_preemption_disabled+0xd0/0xe0 lib/smp_processor_id.c:49 > usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 > usbnet_resume_rx+0x4b/0x170 drivers/net/usb/usbnet.c:708 > usbnet_change_mtu+0x1be/0x220 drivers/net/usb/usbnet.c:417 > __dev_set_mtu net/core/dev.c:9443 [inline] > netif_set_mtu_ext+0x369/0x5c0 net/core/dev.c:9496 > netif_set_mtu+0xb0/0x160 net/core/dev.c:9520 > dev_set_mtu+0xae/0x170 net/core/dev_api.c:247 > dev_ifsioc+0xa31/0x18d0 net/core/dev_ioctl.c:572 > dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821 > sock_do_ioctl+0x19d/0x280 net/socket.c:1204 > sock_ioctl+0x42f/0x6a0 net/socket.c:1311 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:906 [inline] > __se_sys_ioctl fs/ioctl.c:892 [inline] > __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > For historical and portability reasons, the netif_rx() is usually > run in the softirq or interrupt context, this commit therefore add > local_bh_disable/enable() protection in the usbnet_resume_rx(). > > Fixes: 43daa96b166c ("usbnet: Stop RX Q on MTU change") > Link: https://syzkaller.appspot.com/bug?id=81f55dfa587ee544baaaa5a359a060512228c1e1 > Suggested-by: Jakub Kicinski > Signed-off-by: Zqiang > Link: https://patch.msgid.link/20251011070518.7095-1-qiang.zhang@linux.dev > Signed-off-by: Paolo Abeni > [ The context change is due to the commit 2c04d279e857 > ("net: usb: Convert tasklet API to new bottom half workqueue mechanism") > in v6.17 which is irrelevant to the logic of this patch.] > Signed-off-by: Rahul Sharma > --- > drivers/net/usb/usbnet.c | 2 ++ > 1 file changed, 2 insertions(+) What is the git id of this commit in Linus's tree? thanks, greg k-h