From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D8068FF8867 for ; Wed, 29 Apr 2026 14:56:13 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4g5L3J2sJFz2ySf; Thu, 30 Apr 2026 00:56:12 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2600:3c0a:e001:78e:0:1991:8:25" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1777474572; cv=none; b=LmfSJIkqsaqF/6MFzAVp7vhUf8rvESTSs+V0tRvtN4wgTL8YYMwL4R5wkarFOEwumdFGxwnhCvpatveYfvM48zwYDA/CRhsq4FbSkXcpdJVcwofY9fcJOJ0aRL0RjTj/hiGtnfBpo6oiDItu/MCa33TZknL9nqdgX7vm9fnxa2jNQBeEyuEqKFrEvU36ry4zmRA4PPbdKKfRW9ay9f+Kx0T2+xDrlskZ85XYoUBRPjKAm1Nty9EMy6RAWtzMw+172f0THtuJxbIBdR4JTja+JcPFPWeyy7EZYp+34OovxETga0V9qlwF/DYTt9vExoH67chRtVtU+B6eoXItZLZZVg== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1777474572; c=relaxed/relaxed; bh=+b7k0N0qTxSsM85yq3NXVVu9sTCY5exLO54paoX+uGA=; h=Message-ID:Date:MIME-Version:From:Subject:To:Cc:References: In-Reply-To:Content-Type; b=LJdgcIDZEXXftrcn2z89MTI7Y/MYX1o2iy6OESjGd38M4KT1L8RWOYOZnoLez9pDG8SlAL07FtX/uEGib7JpDo9Wl++oiRr7I3Lg6vBgHQZ+ly0z5OaeTTBV3MzbFxuccyrMNT978Y6vcf0c4eZ+xuMtRiH01b/xunoU2BVWl0+yYyOg+j/EAX9a4SuvYdQPa9wLzWwGEphQ1K/8FzcLLJsZwQaVxlHNKetNKu996N8/hSCb4GCd765DGj0K3vt4E8QvskOtMMlMNi6d4njkmgdCxGW9oi9YGVrBz+tcLMWeaAlQOBWSphTXvtOi9aUM4CHgLdIX0RrDhhThagryKg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=ZmhLNwPC; dkim-atps=neutral; spf=pass (client-ip=2600:3c0a:e001:78e:0:1991:8:25; helo=sea.source.kernel.org; envelope-from=chleroy@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=ZmhLNwPC; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2600:3c0a:e001:78e:0:1991:8:25; helo=sea.source.kernel.org; envelope-from=chleroy@kernel.org; receiver=lists.ozlabs.org) Received: from sea.source.kernel.org (sea.source.kernel.org [IPv6:2600:3c0a:e001:78e:0:1991:8:25]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4g5L3H3hmtz2ySc for ; Thu, 30 Apr 2026 00:56:11 +1000 (AEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 2F76943CAC; Wed, 29 Apr 2026 14:56:09 +0000 (UTC) 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 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list 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 >