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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 386E6CA0EE6 for ; Sat, 16 Aug 2025 13:49:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3vjGVqZ801u6hxGqkfTA8jJyWHpR5ckb7YSt41rFQIw=; b=Tj8iikNh/TFbEItk0PL4W0RS75 8sXMIir4UyiCW8J1GCA4YHUB598oEuP/F5+3tf3em0ufoADkbA8oVys2QXtHZsurq5jc4TT4jO1gr 5eH1Zismpy6V34S3zrXH41DDqmLgGuy+fQ5QnADuDuAL2RzFpUXxUOF9D3i95QhVwxA/b6Cxas5T7 cir8XeeA+2YFtIrIovNNprRsHbk6mvR2gbHRh/d5ocpEeqMzdmN2Yu6xZT3+lUivaBHwQK5taEDEW G4q/GWtKD6JfLFOfJmrxylFGVaPSv7hthYCgWz8grB2d2o8g5XeE06AkTI3xfGn7XyvZEhfltzj4c nBRFPnEg==; 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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:42708) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1unHCQ-0002D7-1b; Sat, 16 Aug 2025 14:43:58 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.96) (envelope-from ) id 1unHCM-0000RZ-2K; Sat, 16 Aug 2025 14:43:54 +0100 Date: Sat, 16 Aug 2025 14:43:54 +0100 From: "Russell King (Oracle)" To: Richard Weinberger Cc: Steven Rostedt , Linus Torvalds , LKML , Gabriele Monaco , Nam Cao , John Kacur , Tomas Glozar , linux-arm-kernel@lists.infradead.org Subject: Re: [GIT PULL] runtime verification: Updates for 6.17 Message-ID: References: <20250729174332.3acd1a86@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250816_064622_157887_1A95D2D5 X-CRM114-Status: GOOD ( 14.51 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Aug 16, 2025 at 02:04:34PM +0200, Richard Weinberger wrote: > [Adding ARM folks] > > On Tue, Jul 29, 2025 at 11:43 PM Steven Rostedt wrote: > > Linus, > > > > Runtime verification changes for 6.17 > > [...] > > > - Add a vpanic() to allow for va_list to be passed to panic. > > This change is causing a regression on ARM32. > panic() no longer shows a proper stack trace. > > With this change: > [ 2.943690] Kernel panic - not syncing: VFS: Unable to mount root > fs on unknown-block(0,0) > [ 2.950101] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted > 6.17.0-rc1 #176 NONE > [ 2.950509] Hardware name: Generic DT based system > [ 2.950865] Call trace: > [ 2.951722] unwind_backtrace from show_stack+0x18/0x1c > [ 2.953111] show_stack from dump_stack_lvl+0x54/0x68 > [ 2.953312] dump_stack_lvl from vpanic+0xf8/0x388 > [ 2.953526] vpanic from __do_trace_suspend_resume+0x0/0x50 Please lookup the value of __do_trace_suspend_resume in System.map. > > With commit 3f045de7f5 "panic: Add vpanic()" reverted: > [ 2.680077] Kernel panic - not syncing: VFS: Unable to mount root > fs on unknown-block(0,0) > [ 2.690241] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted > 6.17.0-rc1-dirty #177 NONE > [ 2.690832] Hardware name: Generic DT based system > [ 2.691339] Call trace: > [ 2.692530] unwind_backtrace from show_stack+0x18/0x1c > [ 2.694283] show_stack from dump_stack_lvl+0x54/0x68 > [ 2.694536] dump_stack_lvl from panic+0x110/0x31c > [ 2.694944] panic from mount_root_generic+0x1fc/0x2ac Also please lookup mount_root_generic. > Maybe it changes the stack layout enough such that dump_stack() on > ARM32 is no longer > able to walk it? I'm using gcc 15.1.1, if this matters. Also please check whether you're using frame pointers or the unwinder (CONFIG_UNWINDER_FRAME_POINTER or CONFIG_ARM_UNWIND). Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!