From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7722EC433DB for ; Tue, 16 Mar 2021 09:25:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 473446500E for ; Tue, 16 Mar 2021 09:25:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236177AbhCPJYh (ORCPT ); Tue, 16 Mar 2021 05:24:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42188 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236174AbhCPJYc (ORCPT ); Tue, 16 Mar 2021 05:24:32 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFDF1C06174A for ; Tue, 16 Mar 2021 02:24:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=L2lx90o4BdDmWpFbAcu+Og+AgfQH5O8WgM23Jxff4nc=; b=hmARNqg0Svho+vO/JBIUs7EI+ 1vknHLnSdjHtxZo46iPrDa7FyH0C9PJL0ijLqQqy66n1w3MGzTkKAfbXCX/TiXMb3Wreecw0I9nW9 Y6HhVZrFf0h3HfkgS92g9cDuWEMzV3vDWYeIa5c6dreBEdNiDKM/ED99EwxLAtDQ2RW1d/Db2DKfd SmVhQW/HFSLSZ7XXjzdxuinfb0IA6muO+jF3hsVsOzfQmcUXo6vYBGY3ybBVap4VzPvWOCUndKrbw j9MJ0trTgvMCiAJjmM2WeRtNV1pzDAkdWN9/lFZhzoWxTb/mjKay1dXXDDth0YacX02S2KxqcksK3 26w7s9jaA==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:51352) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lM5w7-00018R-8R; Tue, 16 Mar 2021 09:24:23 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1lM5w5-00068s-Gs; Tue, 16 Mar 2021 09:24:21 +0000 Date: Tue, 16 Mar 2021 09:24:21 +0000 From: Russell King - ARM Linux admin To: Dmitry Vyukov Cc: syzbot , Arnd Bergmann , Linus Walleij , Linux ARM , Andrew Morton , LKML , Linux-MM , syzkaller-bugs Subject: Re: [syzbot] kernel panic: corrupted stack end in openat Message-ID: <20210316092420.GN1463@shell.armlinux.org.uk> References: <00000000000069802205bda22b7f@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: Russell King - ARM Linux admin Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 16, 2021 at 08:59:17AM +0100, Dmitry Vyukov wrote: > On Tue, Mar 16, 2021 at 8:18 AM syzbot > wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 1e28eed1 Linux 5.12-rc3 > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=167535e6d00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=e0cee1f53de33ca3 > > dashboard link: https://syzkaller.appspot.com/bug?extid=0b06ef9b44d00d600183 > > userspace arch: arm > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+0b06ef9b44d00d600183@syzkaller.appspotmail.com > > +arm32 maintainer > I think this is a real stack overflow on arm32, the stack is indeed deep. There's no way to know for sure because there's no indication of the stack pointer in this, so we don't know how much space remains. Therefore we don't know whether this is something in the dumped path, or an interrupt causing it. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! 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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:51352) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lM5w7-00018R-8R; Tue, 16 Mar 2021 09:24:23 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1lM5w5-00068s-Gs; Tue, 16 Mar 2021 09:24:21 +0000 Date: Tue, 16 Mar 2021 09:24:21 +0000 From: Russell King - ARM Linux admin To: Dmitry Vyukov Cc: syzbot , Arnd Bergmann , Linus Walleij , Linux ARM , Andrew Morton , LKML , Linux-MM , syzkaller-bugs Subject: Re: [syzbot] kernel panic: corrupted stack end in openat Message-ID: <20210316092420.GN1463@shell.armlinux.org.uk> References: <00000000000069802205bda22b7f@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210316_092427_203962_E01B2EFA X-CRM114-Status: GOOD ( 15.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Mar 16, 2021 at 08:59:17AM +0100, Dmitry Vyukov wrote: > On Tue, Mar 16, 2021 at 8:18 AM syzbot > wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 1e28eed1 Linux 5.12-rc3 > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=167535e6d00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=e0cee1f53de33ca3 > > dashboard link: https://syzkaller.appspot.com/bug?extid=0b06ef9b44d00d600183 > > userspace arch: arm > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+0b06ef9b44d00d600183@syzkaller.appspotmail.com > > +arm32 maintainer > I think this is a real stack overflow on arm32, the stack is indeed deep. There's no way to know for sure because there's no indication of the stack pointer in this, so we don't know how much space remains. Therefore we don't know whether this is something in the dumped path, or an interrupt causing it. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel