From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 030CD2E62A2; Mon, 3 Nov 2025 09:10:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762161013; cv=none; b=BYU2MgrwT6Rx0h6ccoITT8mhdqR5rOyivIdsZ9ElTLKdkC/zxKOz/4hrNx4uQSmGgBzKmR8Xj+4YBXyzhQZAut7SzFlPEIpKJrZqJVGgyOA2GGNQaUk2f5zjCFe/sZK/mH/V/Sh9XjMr+QCbsrESrten4P6bF48xn0ee5tLGzqQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762161013; c=relaxed/simple; bh=ej3+3NyBvCXCSWQ9oDRykLHSTe5vGRzPbIIjTmMrTg0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=T3VX157C3TpXavHdN/gKMj0bWpmBKPQsocjNBAKKj1uDJONdi0hP2SGrvl/1apYd0kmJ86nyb1aRYaGQKpSEuLOYy2qtQ/Kg+vRUfqXwvvivzuhDgufzzZhtg4p2TYQnaC1f1aAot/K8E0RJe9q8QG4+uQ2cYQuEJDIve5TFoUs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=YJmStuEE; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="YJmStuEE" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=ej3+3NyBvCXCSWQ9oDRykLHSTe5vGRzPbIIjTmMrTg0=; b=YJmStuEEFL2a/mHpGLsykAZg6y FopaSgLxG2SB3DF6XMjdU5Ncw75M8klint/FBkKd8Qt8kdDtrRISwPjC74gcJ2UlTf4xSSdJo9vhb VNPzWxDmVdosg0xKr7ydb0AB8w8/J6gLQOm0euWbPXWe/ONrToZB1EH9F3XiURL0zQLf40jCPZD6J Z7Cz8FNdwHflkpgEtcU1fWAnKQ5K1pBjuMccMbpY9LNKt/Oy1JwBRNLw52t8X2D9PyMWOMNuTrJwu iOJUfJmdYdNHPlIwxXmK8bYaLC73N01tZNazwHVyZui/9RtzRb8OsNO9pRYzoRBDu22DRalNzXQ9k IwW4Xdaw==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vFpi2-0000000Exbb-1xsB; Mon, 03 Nov 2025 08:14:38 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id A5A9330023C; Mon, 03 Nov 2025 10:10:06 +0100 (CET) Date: Mon, 3 Nov 2025 10:10:06 +0100 From: Peter Zijlstra To: Stephen Rothwell Cc: Josh Poimboeuf , Linux Next Mailing List , Linux Kernel Mailing List Subject: Re: linux-next: new objtool warnings Message-ID: <20251103091006.GV3245006@noisy.programming.kicks-ass.net> References: <20251031111515.09c9a4ed@canb.auug.org.au> Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <20251031111515.09c9a4ed@canb.auug.org.au> On Fri, Oct 31, 2025 at 11:15:15AM +1100, Stephen Rothwell wrote: > Hi all, >=20 > My x86_64 allmodconfig builds started producing these warnings today: >=20 > vmlinux.o: warning: objtool: user_exc_vmm_communication+0x15a: call to __= kasan_check_read() leaves .noinstr.text section > vmlinux.o: warning: objtool: exc_debug_user+0x182: call to __kasan_check_= read() leaves .noinstr.text section > vmlinux.o: warning: objtool: exc_int3+0x123: call to __kasan_check_read()= leaves .noinstr.text section > vmlinux.o: warning: objtool: noist_exc_machine_check+0x17a: call to __kas= an_check_read() leaves .noinstr.text section > vmlinux.o: warning: objtool: fred_exc_machine_check+0x17e: call to __kasa= n_check_read() leaves .noinstr.text section >=20 > I can't easily tell what caused this change, sorry. What compiler? This smells like a broken compiler, these are all noinstr and that very much has __no_sanitize_address.