From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (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 87B138F4A; Wed, 5 Nov 2025 03:30:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=150.107.74.76 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762313434; cv=none; b=QIF4nmmjAsf9mjCgjmOW4JGOW+EqLhGeRbWsELXqE+DaosOu+OGL2EmOBWwyAReGn1gkLf8YKJIS5EN98XechzK+40Ws7Dgl89JnGhjD5ljMgKovmZI57BYcBBHYRnAVEBX6lr1UcJ3PKb5+IYbBySRRicICu0NllaSAlsoqKPs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762313434; c=relaxed/simple; bh=eT3BZi+5sPqFB4z9Rk311qAkkCUr6WTNyCKVTm1XJE0=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KgbTMX4H5AQKJvJ9b5RvtaKG4nLC06Qj8cknOaw2aV6YqyQSsQqeIvGtQcE6Af9Y/dCjHg3MoxcZy6zyP5Wh4rWRzCYsdqaTftRZzGuyn9zNpVQ+4J6Eb8n8ppgdxg3WV+iEQk7x1ZxG9qFrf6FFdEnM3/gBJLNITByWqkEhHIc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canb.auug.org.au; spf=pass smtp.mailfrom=canb.auug.org.au; dkim=pass (2048-bit key) header.d=canb.auug.org.au header.i=@canb.auug.org.au header.b=dyDMjZCf; arc=none smtp.client-ip=150.107.74.76 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canb.auug.org.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=canb.auug.org.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=canb.auug.org.au header.i=@canb.auug.org.au header.b="dyDMjZCf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canb.auug.org.au; s=202503; t=1762313428; bh=NoX0TaXICTAckgNWU+qmhek9oO8LZUr7AiAd0doE5r0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=dyDMjZCfyJXUBWTyRUhKeRYT0xH3sJ+Q3TaJAhCEQnI1/LMeNnz8oaxSOShnakCuU OaItlP9UiOGgylw6sipbngNWVKBLnDK65K/qfR6oYTatA40SP9JGQ7OcJcRlmQAcba QsjLRRV4sU2ep9HYYRpVSMFUQvzx4Vmn7enaX6AYBjJXIn+kWxZBKrLycpxAfYYbAr 8Ax9mntjbGI7UiAJbd/R9+n++WFOGcFtw2hhUUETUiD3XgPWTq5RyUKQoOJvyXc6XV e7k/H3Ra3Ojb+0oGmZSAJ6TCuJkSq6Z65VUAh4AlJizC9WpVVX7fKMduzKg4wuycA9 IrMqgduto7LFg== Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange secp256r1 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mail.ozlabs.org (Postfix) with ESMTPSA id 4d1W6r4BYHz4w0L; Wed, 05 Nov 2025 14:30:28 +1100 (AEDT) Date: Wed, 5 Nov 2025 14:30:27 +1100 From: Stephen Rothwell To: Peter Zijlstra Cc: Josh Poimboeuf , Linux Next Mailing List , Linux Kernel Mailing List Subject: Re: linux-next: new objtool warnings Message-ID: <20251105143027.214f491c@canb.auug.org.au> In-Reply-To: <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> <20251103093804.GY3245006@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/3sk+RQrI_4wm/uJ7qnL=.54"; protocol="application/pgp-signature"; micalg=pgp-sha256 --Sig_/3sk+RQrI_4wm/uJ7qnL=.54 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Hi Peter, On Mon, 3 Nov 2025 10:38:04 +0100 Peter Zijlstra wro= te: > > On Mon, Nov 03, 2025 at 08:32:56PM +1100, Stephen Rothwell wrote: > >=20 > > On Mon, 3 Nov 2025 10:10:06 +0100 Peter Zijlstra = wrote: =20 > > > > > > On Fri, Oct 31, 2025 at 11:15:15AM +1100, Stephen Rothwell wrote: =20 > > > >=20 > > > > My x86_64 allmodconfig builds started producing these warnings toda= y: > > > >=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= __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 > >=20 > > And today I didn't get them. So who knows? I did *not* change compiler > > since Friday. =20 >=20 > Oh well, lets chalk it up to gremlins for now. I'll have a look if it > happens again/reliably. These objtool messages have returned today. No change in compiler. --=20 Cheers, Stephen Rothwell --Sig_/3sk+RQrI_4wm/uJ7qnL=.54 Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEENIC96giZ81tWdLgKAVBC80lX0GwFAmkKxNMACgkQAVBC80lX 0GwtTQf8DsXHQzbVJC0VmaAERoYUZAqyiMPpLzd/ZP5M0VLXypPJlvgPc/hROpz4 rP1KSxuL8HdQC+T63QQMUlxWamPOnLndfzAzmELTwHoyTGOBn4M9+6OcrIBkTJ2b XogHUXjx1060pDl73PYNHuN4ISxXUskejKOVg1JzkX+ozCQQax9gmQ1iRUzOlA2I GKUNjR+UioJeTWdPtHfZcl5ApFq1bKustbJZs6XUI/0gUkv/4yCTgYDNufRRTIoC VRLYixTVYMKn5FRACm3RaL1XlUKNk3NV8FKbB8PDcCVXf+p3J0kM6Ddkt2DTWVfu eoponhdSqdSOh6fPUW06nfuDCCeyGA== =k4Ti -----END PGP SIGNATURE----- --Sig_/3sk+RQrI_4wm/uJ7qnL=.54--