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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C2FE1D3ABCF for ; Mon, 11 Nov 2024 22:40:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=8EbqN93yd2UWhay6/ImNRFz/xr1NIW/Z+LUt+/wm96k=; b=Os9fWM3zkixaaBZZ7y9Z5jTP9N wslGel+7zFgZfhahaigjksNYHFbwxsEXxmoLIcKD+7us+rlThaDpD5X3eRWCz0E7X8WFbzFwPgoaE QwUf/TyC2i5SK3OZ8GEKtuve8bMSnfPosXiCvVLl/rBs72m+h9v3Ltc7Z+wOK02ea7w07BqACIrbZ gtJqbE1NL/83i3lHKNadu0nh4HteIex4omn2OKsAz9kdk9ogUzTx6VVbC76kKHGfjCiBriSn4iGoo Gm7efEiuRT1FHlsB84JRYkuGXOKkB9kkguv4N/LJF6ydWlCcHry4PBC7KGUMu2ffpUY5ncRo16j80 yjhze8rQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tAd51-00000001XVd-1ImH; Mon, 11 Nov 2024 22:40:19 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tAd3F-00000001XBq-44v9 for linux-arm-kernel@bombadil.infradead.org; Mon, 11 Nov 2024 22:38:29 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:Content-Type :MIME-Version:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To:Content-ID: Content-Description:In-Reply-To:References; bh=8EbqN93yd2UWhay6/ImNRFz/xr1NIW/Z+LUt+/wm96k=; b=SbIWmHfsOanDX4rUr/YPcyQmq4 DI/aPzFtVa32WO9eWIBe0q/+3733JuDql3GHINxo+/Kx3HjKFX8kOve34l+lwYhj0UZRqybllLiRD MbVa2fLkRSmQOiKPDczoxenNMIS16+HpBt82B3I6+Myv4pQLCfTHgEaVklbdxdYlxYSNdVk9OU3Db GGAMXOTKjtWaWdkC1y397SB0HZ8N3vYmkYsjdv47NLonKNy1votf0Jmmj0EKwT4hxcIZJaV0B4Q9K yZHl2GC6fJdAP53HhsPQ05ed3rew8rCIA4a4HhYAsiezAqqEUA3qhrqqfjCaSrgDc/6YHpe3nqYj4 EydHznBA==; Received: from mail-lf1-x129.google.com ([2a00:1450:4864:20::129]) by desiato.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tAd3C-0000000Cwxa-29Am for linux-arm-kernel@lists.infradead.org; Mon, 11 Nov 2024 22:38:28 +0000 Received: by mail-lf1-x129.google.com with SMTP id 2adb3069b0e04-53c779ef19cso5951958e87.3 for ; Mon, 11 Nov 2024 14:38:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1731364703; x=1731969503; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:subject:cc:to :from:date:from:to:cc:subject:date:message-id:reply-to; bh=8EbqN93yd2UWhay6/ImNRFz/xr1NIW/Z+LUt+/wm96k=; b=NGPoxMMxmWCQRb2p8X+Tt0aSV3Rwp/nfNoJmdq5D70B0igDzhBa001ioKJg2uKgppL MjDh2cuVFmGn6zlySfNUxYM3zwywIBUyYbkFr5m0nrYeoyPrSoFvgi9eFq+tE55KWWef aGDgn2cHiO8UfE/Iv0ODIfvPmsPbgX5nGjN/CsIG455XxsLBxI0Sbiqr/MeizmGNt7XT VjGe970kZCi+W96qTlm2TOvQXROgwtGTZNmXFzlEr4RMn54WI1yBzNq2q2+jEZ5SVcO8 fbmYrXg5q7nMoZ4sM4KKOwiDzQg3xtcwfQgPspHAGHYhAnMZmSgEZnYmxTg6ylggVkOM pYhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731364703; x=1731969503; h=content-transfer-encoding:mime-version:message-id:subject:cc:to :from:date:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=8EbqN93yd2UWhay6/ImNRFz/xr1NIW/Z+LUt+/wm96k=; b=CUnDwX+iHgvCuN2SYx9vIu1kCiHAIhfKLtgiRAcspYQBlULOGVwb+lr0ZdimbSS0mZ PT7OB8CjMTUdSf0t+S07t/dlPkhbDzYT2AM0DpPko1eFvM/zJPXb3VMmSww3Z6j9ur3y Ub6XxgqqYj0/gFckaarQj9qg4NCHDC+KkxWS7fiJrM8iGZOzN2So3Bu+N6vviMNS/VEJ +AoCKueM5NtQWK+3C2HE4oCMkcjSxHeBy25Cn/MYW81ZvF+mJdManDOtOG0By1Kk0Pvu NXXOieesqmuPzq5Xj4TznALxmmK9nM5WCuLH/QF48SwKw5A0s9oO9eEpqzHq1Bp97hSf FiTw== X-Gm-Message-State: AOJu0YxTvmFXhADIXXmTKj4B32WIs01ZCxktbB86K3eUWm8K02du0al2 6tV/MBBWXoyKPWyPGnaeDNOcWNlbTBGdbk6cttwmOvnKkO+iXMyxKL3GQg== X-Google-Smtp-Source: AGHT+IFozeSO1uP5AxxxtRE0XJzMCBfZblj4zdTGf1m3Jb114n9eoBjNlvPbihoU769OkbunHeHDhQ== X-Received: by 2002:a05:6512:282a:b0:53a:40e:d55f with SMTP id 2adb3069b0e04-53d86289b09mr5832001e87.15.1731364702444; Mon, 11 Nov 2024 14:38:22 -0800 (PST) Received: from foxbook (bff246.neoplus.adsl.tpnet.pl. [83.28.43.246]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-53d8269a86dsm1718742e87.31.2024.11.11.14.38.20 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 11 Nov 2024 14:38:20 -0800 (PST) Date: Mon, 11 Nov 2024 23:38:17 +0100 From: =?UTF-8?B?TWljaGHFgg==?= Pecio To: linux-arm-kernel@lists.infradead.org Cc: Linus Walleij Subject: cacheflush completely broken, suspecting PAN+LPAE Message-ID: <20241111233817.2f824c19@foxbook> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241111_223826_689944_02A585AF X-CRM114-Status: UNSURE ( 9.73 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, I installed v6.11.5 on Tegra K1 (Cortex-A15) with tegra_defconfing + CONFIG_ARM_LPAE + a few drivers + minor patches for driver issues. gdb segfaults on startup, strace shows this: openat(AT_FDCWD, "/usr/lib/guile/3.0/ccache/ice-9/psyntax-pp.go", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 11 _llseek(11, 0, [477309], SEEK_END) = 0 mmap2(NULL, 477309, PROT_READ, MAP_PRIVATE, 11, 0) = 0xb378a000 close(11) = 0 mprotect(0xb37da000, 43512, PROT_READ|PROT_WRITE) = 0 mmap2(NULL, 262144, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb374a000 cacheflush(0xb374a000, 0xb374b000, 0) = -1 EFAULT (Bad address) cacheflush(0xb374a000, 0xb374b000, 0) = -1 EFAULT (Bad address) cacheflush(0xb374a000, 0xb374b000, 0) = -1 EFAULT (Bad address) futex(0xb6f0bb14, FUTEX_WAKE_PRIVATE, 2147483647) = 0 cacheflush(0xb374a000, 0xb374b000, 0) = -1 EFAULT (Bad address) cacheflush(0xb374a000, 0xb374b000, 0) = -1 EFAULT (Bad address) --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x4} --- guile is apparently a scripting language with JIT compiler, disabling JIT resolves the crash, so cacheflush is a big suspect at this point. No apparent valid reason for those failures and no recent changes to cacheflush handling that I see, so I searched for commits touching LPAE (perhaps the most uncommon part of my system) and I quickly found the ARM_PAN feature, which claims to monkey with page tables. Hmm... Disabled ARM_PAN, cacheflush returns 0 now and gdb crashes no more. So I guess it looks like there is a problem with this feature, perhaps a missing "permit user accesss" somewhere? Thanks, Michal