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 DEE482EBB98; Mon, 3 Nov 2025 09:38:06 +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=1762162688; cv=none; b=jm+f6fWiWrHU+ulC43VIfXZIG07bEGboS26w1FoO1L4WYNdbZNwRjOQVFNGy6PFJtdc1fwS0eTltHj6rGa6Up47DA2Zc9rGiorbJl0Ynk9Pk1vs0LZrhd1IjtEqf8efvfMnNoK+b92wfFLITt2HNCRKu51uQKnSfqS1m/MGQrCo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762162688; c=relaxed/simple; bh=buv33Uz2Fo5fwFIVaIdaFUPAiAI11WQiPVvmTTQ8Zw4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TjQ/jOVFaI6M79nyj55HIZjIAQByPDeZUYsI66n7cEcJSh8qyGk4WmS0vYeIwhq5KwToTZmOcWRvweO9kCa/67z5wDiTMOQlWYV+Ej6Rb6Pe63YUScG5/EtXTEdaLZbU4X2JRlscDyxMYeXMwEktSs9BSIQU3aInlxzsnSxLEl8= 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=fS2bv1Kp; 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="fS2bv1Kp" 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=gsDapFRugM+4XwGq22nVfGICtpH+R8BdlGsLTJySzLk=; b=fS2bv1KpeHE/vj0SlxiKC7ffk3 CKn04SPP2TPAJSHdqAAzRiod6AHFz1c/UCJ3cI9/KnHufmCdiX8owqRDox/9wE/1NUeHduAPp2HR8 TV02nXRa0EopydUkHTe+dMaukt11gXDUysJCB/lWdVU5t2Bw5vI2BUxTRo7OaSf58j+shL2Gk+qBO D6LVPlQqeYD12WvCcyqbLZXQPI9zH0BdVB1S/7jCeEC0sxnh/VrRYr+XgvcBlusuvKrZDYyke2rfT okfbzv6U23kCTtfOSfU/vMWr17w/a6SN4gD0xOLtdn4Z97Beg1V0Qv/k3NE4IEkcdnPjd9px7MqiL YbA3aGeQ==; 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 1vFq95-0000000F0Es-1EO8; Mon, 03 Nov 2025 08:42:35 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 9947E30023C; Mon, 03 Nov 2025 10:38:04 +0100 (CET) Date: Mon, 3 Nov 2025 10:38:04 +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: <20251103093804.GY3245006@noisy.programming.kicks-ass.net> References: <20251031111515.09c9a4ed@canb.auug.org.au> <20251103091006.GV3245006@noisy.programming.kicks-ass.net> <20251103203256.5ac39302@canb.auug.org.au> Precedence: bulk X-Mailing-List: linux-kernel@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: <20251103203256.5ac39302@canb.auug.org.au> On Mon, Nov 03, 2025 at 08:32:56PM +1100, Stephen Rothwell wrote: > Hi Peter, >=20 > On Mon, 3 Nov 2025 10:10:06 +0100 Peter Zijlstra w= rote: > > > > On Fri, Oct 31, 2025 at 11:15:15AM +1100, Stephen Rothwell wrote: > > >=20 > > > My x86_64 allmodconfig builds started producing these warnings today: > > >=20 > > > vmlinux.o: warning: objtool: user_exc_vmm_communication+0x15a: call t= o __kasan_check_read() leaves .noinstr.text section > > > vmlinux.o: warning: objtool: exc_debug_user+0x182: call to __kasan_ch= eck_read() leaves .noinstr.text section > > > vmlinux.o: warning: objtool: exc_int3+0x123: call to __kasan_check_re= ad() leaves .noinstr.text section > > > vmlinux.o: warning: objtool: noist_exc_machine_check+0x17a: call to _= _kasan_check_read() leaves .noinstr.text section > > > vmlinux.o: warning: objtool: fred_exc_machine_check+0x17e: call to __= kasan_check_read() leaves .noinstr.text section > > >=20 > > > I can't easily tell what caused this change, sorry. =20 > >=20 > > What compiler? This smells like a broken compiler, these are all > > noinstr and that very much has __no_sanitize_address. >=20 > And today I didn't get them. So who knows? I did *not* change compiler > since Friday. Oh well, lets chalk it up to gremlins for now. I'll have a look if it happens again/reliably.