From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 81EAD38C434; Wed, 8 Apr 2026 11:50:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775649033; cv=none; b=PEqsYDCmGlxGRKZ/2s9EtUDgJQvK4UCOTBa/DgKWbPyRzOdvmPAE6tUnrsQr+/tOefK2CIj1Av5uxWZPKJVbtXSUKTbeVlGSGwtzS9WIxcAaSk7xsIMj+uxYhyMqAS3T0NFQ1eezTMKZj4hWE9Fl6wCTAX0+BlWR9e+aHszxHMw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775649033; c=relaxed/simple; bh=8fZDPM3xiCftkDHiJn5TV/jH0Spm1UGKJBtbZuNzyCs=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=VuuS0f6Hs0gnk9aauwEfToc0P+HMbBbhCBUFAYCxdPj+jPjpsfVPLpPFW5izd9sNoDCR6HBp/7PSwExvgY1cZaxwvMa/qBsMVcoJxg3lC6m22MS4gu134IQnFFc3zRhcMAwGPi24C5e0DXcUg2A+/dpwJMgeYCf0mhgRtufWc0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OFpx77or; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OFpx77or" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA1B9C19424; Wed, 8 Apr 2026 11:50:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775649033; bh=8fZDPM3xiCftkDHiJn5TV/jH0Spm1UGKJBtbZuNzyCs=; h=Date:From:To:Cc:In-Reply-To:References:Subject:From; b=OFpx77ors7Pxe9MRBKwd/lyTM3pvQWAw/Fwj+EfynYkfkNg2UlOCeS8d6/4kgVxIT 9zrVATTkHEZYh4rKxMyPqpMBsp4vWiVCpJCbftKWQEtY13chhEshM9gbAddvr81Fs7 yxuRNP8TTudXP3zMuwM9ars54QZ48wVStzKp8KvLDjIJEwaANEB7HZvK2ROccq7AF+ CDc+41zSKzNVnyyQ1FBYh/vTxEwy7RFihXSSPnCjtBm9Lw9j1Fj9czXqhKMHKt9dFW q5883bq107gt3wV6Uy3+ZjYgtwYALAk6gdgBApkpOqEvT0eOr2H6bhYlOFfB5DU4Y4 CyPEVQx4KnFHQ== Received: from phl-compute-01.internal (phl-compute-01.internal [10.202.2.41]) by mailfauth.phl.internal (Postfix) with ESMTP id D913AF4007C; Wed, 8 Apr 2026 07:50:31 -0400 (EDT) Received: from phl-imap-02 ([10.202.2.81]) by phl-compute-01.internal (MEProxy); Wed, 08 Apr 2026 07:50:31 -0400 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefhedrtddtgddvfeeglecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpuffrtefokffrpgfnqfghnecuuegr ihhlohhuthemuceftddtnecunecujfgurhepofggfffhvfevkfgjfhfutgfgsehtjeertd ertddtnecuhfhrohhmpedftehrugcuuehivghshhgvuhhvvghlfdcuoegrrhgusgeskhgv rhhnvghlrdhorhhgqeenucggtffrrghtthgvrhhnpedvueehiedtvedtleekuddutefgff dtleetfeetveejveejieehfefhjeeijeefudenucevlhhushhtvghrufhiiigvpedtnecu rfgrrhgrmhepmhgrihhlfhhrohhmpegrrhguodhmvghsmhhtphgruhhthhhpvghrshhonh grlhhithihqdduieejtdehtddtjeelqdeffedvudeigeduhedqrghruggspeepkhgvrhhn vghlrdhorhhgseifohhrkhhofhgrrhgurdgtohhmpdhnsggprhgtphhtthhopeefpdhmoh guvgepshhmthhpohhuthdprhgtphhtthhopegthhhlohhrsehstghhohhurdgukhdprhgt phhtthhopehlihhnuhigqdgvfhhisehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpth htoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhg X-ME-Proxy: Feedback-ID: ice86485a:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id B746F700065; Wed, 8 Apr 2026 07:50:31 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AhAuoRtCUE3w Date: Wed, 08 Apr 2026 13:50:11 +0200 From: "Ard Biesheuvel" To: "Hans Schou" Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org Message-Id: <85ad7864-6ea6-4d78-97aa-f67cbe4eb22d@app.fastmail.com> In-Reply-To: References: Subject: Re: EFI stub: WARNING: Failed to measure data for event 1: 0x800000000000000b Content-Type: text/plain Content-Transfer-Encoding: 7bit Hello Hans, On Sat, 4 Apr 2026, at 12:54, Hans Schou wrote: > Hi Ard > > This message has start showing for 3 seconds when booting: > EFI stub: WARNING: Failed to measure data for event 1: 0x800000000000000b > This is a harmless warning from the TPM code in your BIOS. > Afterwards my Linux Mint boots up normally. > > Linux p52 6.8.0-107-generic #107-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 13 > 19:51:50 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux > > GRUB 2.12 > > This warning occurs only in several different events. > It can be eliminated in different work arounds: > 1. Having too many kernels installed. 19 is too many. 4 is few. > Solution: Remove some old kernels. > 2. Enable/Disable secure boot in BIOS (if posssible) > 3. Having Linux/Windows dual boot. Work around: add > "CONFIG_EFI_HANDOVER_PROTOCOL=N EFI_STUB=N" to > GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub. > > Only "1." is my own experience. > 3. seems implausible to me: putting those strings on the command line has no effect, those are build options that must be taken into account while compiling the kernel. > It seems like this situation happens as a combination of GRUB and the > kernel. > The kernel should not be able to see I have more than 4 kernel > installed, as at the time of reporting the warning, one of my the > kernels are already about to boot. > So it could be GRUB which gives some extra parameters to the kernel > when booting. How else could the kernel know there are "too many" > kernels installed? In that case the bug is in GRUB and the kernel is > just reporting it. > > By searching internet I found: > * First seen year 2023 (kernel version not reported) > * OS reported used: Mint, SuSE, Ubuntu, Ubuntu MATE, Kubuntu > > If it's due to GRUB, I apologize for the inconvenience. You can just ignore this warning. I wouldn't recommend turning off secure boot just for this reason.