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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7A67C43334 for ; Thu, 16 Jun 2022 18:35:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232129AbiFPSfT (ORCPT ); Thu, 16 Jun 2022 14:35:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229683AbiFPSfR (ORCPT ); Thu, 16 Jun 2022 14:35:17 -0400 Received: from mail-vk1-xa2b.google.com (mail-vk1-xa2b.google.com [IPv6:2607:f8b0:4864:20::a2b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7260753B66 for ; Thu, 16 Jun 2022 11:35:16 -0700 (PDT) Received: by mail-vk1-xa2b.google.com with SMTP id x190so1006096vkc.9 for ; Thu, 16 Jun 2022 11:35:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=psAM3XSoUx3a6FBqAFWlilD01aN43ceaHbI70B2BMqo=; b=WpuVTgzMQk8SWtLifPEPKAqGSi9WjFaQLJQAeW+3k3qtd8fMRP8TNjGacCFT8J9+BA NBNvxk6jjA6KAJK/Tw5YMMxE+QcciZutqNiR0xLFDfQePSU506V7I9FU2ag4IwxvPY9c xHbs40SSA6j6sPueSlb/cPfgNDR+aynz/1dmOZjBarp2Dys+zT4Kf9rWSe6AutkLn+To oyBQZWGCJbi5AWd6dsyP1W5PSM3lrtqIk9xEnIM2RwaaHucqO74dKJ8bOq9kccFASJ58 7lMD2aS5FuuTcY+4ykf5SEh0+DkH8Tc8mCfrCPoMvE3vZ6sZFdJWL9n5F9DRe+hBuxyc 1pGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=psAM3XSoUx3a6FBqAFWlilD01aN43ceaHbI70B2BMqo=; b=CxH8/BIrKVY21hgwp7p3cpc0sILpC4w+zaiEz5tK+SGhBCjOoEpZcc8TyEm6R7s+M3 eY1oRT9jibxHD1FncyP02gIeoR0WguH0Z8r+iKlrKSdtSLxOBIYfm19Igsl0gKKS0xhU 4vx9CD4uNo4Fa4THCVmjORLVqnogHnMDWB+QVTYag5jBJn2IrBxkSSbG7s2zokQDnTBQ PJdNgs1oLd80UFRNk3MfZCmiSQdCSbwbdWrm305vml4/4SuxHQdSIN7mzCKGZgXV2jpd ItiU2XnmG6dRpahj1QGBpYr1T2PLXhSLPf6tDswN4f/nO9IOshVAvt/2sY7fXg1FeztY XcpQ== X-Gm-Message-State: AJIora+s/f9fv0iGPUFRBJ9Dm0aur4lX/O5ppCLwnV6LnJ49mxv+ZSxH ThvtKxmA2NbvAaxs1uL/yC8B5lK6O6HW9HdKkf93plrNHJ7sDw== X-Google-Smtp-Source: AGRyM1upxexvBL7QTAcwnwNY6O/TiaEQPLEPc1kHs9nVNcjNus3dFIRENoM6J69nD6QIlZ6tjz051qWkMiPaO+EMb6M= X-Received: by 2002:a1f:add0:0:b0:361:1bf:7c58 with SMTP id w199-20020a1fadd0000000b0036101bf7c58mr3050170vke.31.1655404515367; Thu, 16 Jun 2022 11:35:15 -0700 (PDT) MIME-Version: 1.0 References: <20220615185500.i5bzt7srzm6q72na@revolver> <20220616014956.6jgxvbzh4ld3c32q@revolver> <20220616025557.euz6z5rlh7fqewy2@revolver> <20220616182647.hlwadwzvlojbjlj5@revolver> In-Reply-To: <20220616182647.hlwadwzvlojbjlj5@revolver> From: Yu Zhao Date: Thu, 16 Jun 2022 12:34:39 -0600 Message-ID: Subject: Re: [PATCH v9 28/69] mm/mmap: reorganize munmap to use maple states To: Liam Howlett Cc: Qian Cai , "maple-tree@lists.infradead.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andrew Morton Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 16, 2022 at 12:27 PM Liam Howlett wrote: > > * Yu Zhao [220616 01:56]: > > On Wed, Jun 15, 2022 at 11:45 PM Yu Zhao wrote: > > > > > > On Wed, Jun 15, 2022 at 9:02 PM Yu Zhao wrote: > > > > > > > > On Wed, Jun 15, 2022 at 8:56 PM Liam Howlett wrote: > > > > > > > > > > * Yu Zhao [220615 21:59]: > > > > > > On Wed, Jun 15, 2022 at 7:50 PM Liam Howlett wrote: > > > > > > > > > > > > > > * Yu Zhao [220615 17:17]: > > > > > > > > > > > > > > ... > > > > > > > > > > > > > > > > Yes, I used the same parameters with 512GB of RAM, and the kernel with > > > > > > > > > KASAN and other debug options. > > > > > > > > > > > > > > > > Sorry, Liam. I got the same crash :( > > > > > > > > > > > > > > Thanks for running this promptly. I am trying to get my own server > > > > > > > setup now. > > > > > > > > > > > > > > > > > > > > > > > 9d27f2f1487a (tag: mm-everything-2022-06-14-19-05, akpm/mm-everything) > > > > > > > > 00d4d7b519d6 fs/userfaultfd: Fix vma iteration in mas_for_each() loop > > > > > > > > 55140693394d maple_tree: Make mas_prealloc() error checking more generic > > > > > > > > 2d7e7c2fcf16 maple_tree: Fix mt_destroy_walk() on full non-leaf non-alloc nodes > > > > > > > > 4d4472148ccd maple_tree: Change spanning store to work on larger trees > > > > > > > > ea36bcc14c00 test_maple_tree: Add tests for preallocations and large > > > > > > > > spanning writes > > > > > > > > 0d2aa86ead4f mm/mlock: Drop dead code in count_mm_mlocked_page_nr() > > > > > > > > > > > > > > > > ================================================================== > > > > > > > > BUG: KASAN: slab-out-of-bounds in mab_mas_cp+0x2d9/0x6c0 > > > > > > > > Write of size 136 at addr ffff88c35a3b9e80 by task stress-ng/19303 > > > > > > > > > > > > > > > > CPU: 66 PID: 19303 Comm: stress-ng Tainted: G S I 5.19.0-smp-DEV #1 > > > > > > > > Call Trace: > > > > > > > > > > > > > > > > dump_stack_lvl+0xc5/0xf4 > > > > > > > > print_address_description+0x7f/0x460 > > > > > > > > print_report+0x10b/0x240 > > > > > > > > ? mab_mas_cp+0x2d9/0x6c0 > > > > > > > > kasan_report+0xe6/0x110 > > > > > > > > ? mast_spanning_rebalance+0x2634/0x29b0 > > > > > > > > ? mab_mas_cp+0x2d9/0x6c0 > > > > > > > > kasan_check_range+0x2ef/0x310 > > > > > > > > ? mab_mas_cp+0x2d9/0x6c0 > > > > > > > > ? mab_mas_cp+0x2d9/0x6c0 > > > > > > > > memcpy+0x44/0x70 > > > > > > > > mab_mas_cp+0x2d9/0x6c0 > > > > > > > > mas_spanning_rebalance+0x1a3e/0x4f90 > > > > > > > > > > > > > > Does this translate to an inline around line 2997? > > > > > > > And then probably around 2808? > > > > > > > > > > > > $ ./scripts/faddr2line vmlinux mab_mas_cp+0x2d9 > > > > > > mab_mas_cp+0x2d9/0x6c0: > > > > > > mab_mas_cp at lib/maple_tree.c:1988 > > > > > > $ ./scripts/faddr2line vmlinux mas_spanning_rebalance+0x1a3e > > > > > > mas_spanning_rebalance+0x1a3e/0x4f90: > > > > > > mast_cp_to_nodes at lib/maple_tree.c:? > > > > > > (inlined by) mas_spanning_rebalance at lib/maple_tree.c:2997 > > > > > > $ ./scripts/faddr2line vmlinux mas_wr_spanning_store+0x16c5 > > > > > > mas_wr_spanning_store+0x16c5/0x1b80: > > > > > > mas_wr_spanning_store at lib/maple_tree.c:? > > > > > > > > > > > > No idea why faddr2line didn't work for the last two addresses. GDB > > > > > > seems more reliable. > > > > > > > > > > > > (gdb) li *(mab_mas_cp+0x2d9) > > > > > > 0xffffffff8226b049 is in mab_mas_cp (lib/maple_tree.c:1988). > > > > > > (gdb) li *(mas_spanning_rebalance+0x1a3e) > > > > > > 0xffffffff822633ce is in mas_spanning_rebalance (lib/maple_tree.c:2801). > > > > > > quit) > > > > > > (gdb) li *(mas_wr_spanning_store+0x16c5) > > > > > > 0xffffffff8225cfb5 is in mas_wr_spanning_store (lib/maple_tree.c:4030). > > > > > > > > > > > > > > > Thanks. I am not having luck recreating it. I am hitting what looks > > > > > like an unrelated issue in the unstable mm, "scheduling while atomic". > > > > > I will try the git commit you indicate above. > > > > > > > > Fix here: > > > > https://lore.kernel.org/linux-mm/20220615160446.be1f75fd256d67e57b27a9fc@linux-foundation.org/ > > > > > > A seemingly new crash on arm64: > > > > > > KASAN: null-ptr-deref in range [0x0000000000000000-0x000000000000000f] > > > Call trace: > > > __hwasan_check_x2_67043363+0x4/0x34 > > > mas_wr_store_entry+0x178/0x5c0 > > > mas_store+0x88/0xc8 > > > dup_mmap+0x4bc/0x6d8 > > > dup_mm+0x8c/0x17c > > > copy_mm+0xb0/0x12c > > > copy_process+0xa44/0x17d4 > > > kernel_clone+0x100/0x2cc > > > __arm64_sys_clone+0xf4/0x120 > > > el0_svc_common+0xfc/0x1cc > > > do_el0_svc_compat+0x38/0x5c > > > el0_svc_compat+0x68/0xf4 > > > el0t_32_sync_handler+0xc0/0xf0 > > > el0t_32_sync+0x190/0x194 > > > Code: aa0203e0 d2800441 141e931d 9344dc50 (38706930) > > > > And bad rss counters from another arm64 machine: > > > > BUG: Bad rss-counter state mm:a6ffff80895ff840 type:MM_ANONPAGES val:4 > > Call trace: > > __mmdrop+0x1f0/0x208 > > __mmput+0x194/0x198 > > mmput+0x5c/0x80 > > exit_mm+0x108/0x190 > > do_exit+0x244/0xc98 > > __arm64_sys_exit_group+0x0/0x30 > > __wake_up_parent+0x0/0x48 > > el0_svc_common+0xfc/0x1cc > > do_el0_svc_compat+0x38/0x5c > > el0_svc_compat+0x68/0xf4 > > el0t_32_sync_handler+0xc0/0xf0 > > el0t_32_sync+0x190/0x194 > > Code: b000b520 91259c00 aa1303e1 94482015 (d4210000) > > > > What was the setup for these two? I'm running trinity, but I suspect > you are using stress-ng? That's correct. > If so, what are the arguments? My arm64 vm is > even lower memory than my x86_64 vm so I will probably have to adjust > accordingly. I usually lower the N for `-a N`.