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 3567D325707 for ; Wed, 29 Apr 2026 14:56:09 +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=1777474569; cv=none; b=W7wgeWViWorszUlohvlj2T9Uwagic4lvGJuK0YkBwNphAgPkPlrcC/7W4BT3bAIKNlTKARnY0Ie7BtIfucCqUHjUwf+vPUTA6Rc9NATMcTodKm28CTvpsrwt1rEiflmGn2YG2Fecc7Bj0IOABGdENgIw7HxdBoY4KuiJ6z05+D0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777474569; c=relaxed/simple; bh=CSOdFd7szD0Ao2hLSpmBMSj30LDJUzA9HwyCrM7mFHE=; h=Message-ID:Date:MIME-Version:From:Subject:To:Cc:References: In-Reply-To:Content-Type; b=ZlsOaH47U0IV5cJJ2IkOvVPCeds1D7ewj+gsbN/9FedwIVnqzORy554nuM6ME6JgR7oYMUatyNKM2LR6+3kilHPGkx/KG/QwekZginuAyFmJ9sqpfiGyiIncqQXVX4PiWhYStILeKl+iKPiS14KzMRfq8iE++yvrsXyFbz5qj6k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZmhLNwPC; 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="ZmhLNwPC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07A35C19425; Wed, 29 Apr 2026 14:56:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777474569; bh=CSOdFd7szD0Ao2hLSpmBMSj30LDJUzA9HwyCrM7mFHE=; h=Date:From:Subject:To:Cc:References:In-Reply-To:From; b=ZmhLNwPCzDGJ+arpjX/REC5icJ2Ri121oKkTKnsEizrLsLOE0N9ruH0+blxCJ0LB9 Y02Um7/DMSfFqkuKD/x3CFV9Ev7cXtjw1UKSfxRJMOa0gXelaJcysFoSIOuY0mjek2 exllRRmPlOrTFrPEPwxevy99PBRROS4q+P8l+Dzff+ivsGhJ0G8GY8r0ObGkhg5FzL LyX8ECyspMDfX51u3V7tk1Baw0PjirR51qlJtPJW8SqInAFa9z/46rU31e1lMgE5lK seiZfHePVXeLK1ofRDMLLO1JeV1BO+tls7GmQZ9RfNzX42+Y9qgFKX0mzsw+g4hT7i f41/6U4FINpSg== Message-ID: <87c448ad-4ee0-4605-8a5f-7c7661a156a2@kernel.org> Date: Wed, 29 Apr 2026 16:56:05 +0200 Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: "Christophe Leroy (CS GROUP)" Subject: Re: iov_kunit_copy_to_kvec: ASSERTION FAILED at lib/tests/kunit_iov_iter.c:63, Expected got == npages, but, got == 1 (0x1), npages == 256 (0x100) (v7.0.2, ppc) To: Erhard Furtner , linux-hardening@vger.kernel.org, Kees Cook , David Howells Cc: linuxppc-dev@lists.ozlabs.org References: <2708666d-68f8-4cd3-9b25-f14ceeba3a1f@mailbox.org> Content-Language: fr-FR In-Reply-To: <2708666d-68f8-4cd3-9b25-f14ceeba3a1f@mailbox.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Le 29/04/2026 à 13:45, Erhard Furtner a écrit : > Greetings! > > Getting this on my G4 DP on kernel v7.0.2 and v7.1-rc1 via 'modprobe -v > kunit_iov_iter': > > [...] > KTAP version 1 >  1..1 >      KTAP version 1 >      # Subtest: iov_iter >      # module: kunit_iov_iter >      1..12 >      # iov_kunit_copy_to_kvec: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 1 iov_kunit_copy_to_kvec This happens in alloc_pages_bulk_noprof(), due to pcp = pcp_spin_trylock(zone->per_cpu_pageset); if (!pcp) goto failed; Because: #ifdef CONFIG_SMP [...] /* * On CONFIG_SMP=n the UP implementation of spin_trylock() never fails and thus * is not compatible with our locking scheme. However we do not need pcp for * scalability in the first place, so just make all the trylocks fail and take * the slow path unconditionally. */ #else #define pcp_spin_trylock(ptr) \ NULL So apparently it is expected that alloc_pages_bulk() returns 1 on non-SMP. Christophe >      # iov_kunit_copy_from_kvec: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 2 iov_kunit_copy_from_kvec >      # iov_kunit_copy_to_bvec: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 3 iov_kunit_copy_to_bvec >      # iov_kunit_copy_from_bvec: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 4 iov_kunit_copy_from_bvec >      # iov_kunit_copy_to_folioq: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 5 iov_kunit_copy_to_folioq >      # iov_kunit_copy_from_folioq: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 6 iov_kunit_copy_from_folioq >      # iov_kunit_copy_to_xarray: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 7 iov_kunit_copy_to_xarray >      # iov_kunit_copy_from_xarray: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 8 iov_kunit_copy_from_xarray >      # iov_kunit_extract_pages_kvec: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 9 iov_kunit_extract_pages_kvec >      # iov_kunit_extract_pages_bvec: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 10 iov_kunit_extract_pages_bvec >      # iov_kunit_extract_pages_folioq: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 11 iov_kunit_extract_pages_folioq >      # iov_kunit_extract_pages_xarray: ASSERTION FAILED at lib/tests/ > kunit_iov_iter.c:63 >      Expected got == npages, but >          got == 1 (0x1) >          npages == 256 (0x100) >      not ok 12 iov_kunit_extract_pages_xarray >  # iov_iter: pass:0 fail:12 skip:0 total:12 >  # Totals: pass:0 fail:12 skip:0 total:12 >  not ok 1 iov_iter > > > Suppose this may be a ppc/BE specific test failure as I don't get it on > my Thinkpad T60 (x86). > > Full dmesg and kernel .config available on request. > > Greetings, > Erhard >