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 EDFE1C6379F for ; Sat, 7 Jan 2023 07:13:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229780AbjAGHBS (ORCPT ); Sat, 7 Jan 2023 02:01:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229475AbjAGHBQ (ORCPT ); Sat, 7 Jan 2023 02:01:16 -0500 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA6E669B0C for ; Fri, 6 Jan 2023 23:01:14 -0800 (PST) Received: by mail-io1-f69.google.com with SMTP id w18-20020a5d9cd2000000b006e32359d7fcso1892463iow.15 for ; Fri, 06 Jan 2023 23:01:14 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=WNNiDRVnMpwR65nt0OPdZsgkxg3Sswa/jAC6EPgcxmE=; b=puryKtePMts/39/TEGzE5+zZfrEgtb27ht1GuwDyaQyWcZYQp/GKLEcxrLYmreZBnk V7olBVupM4PWJX3U9hQrgl/qLeFwReB9SKGyxqlMqSUt/FgbUPuN+Eky1IJh7hLPinAG Rfi40uHJOXOrzKbBHDTa2zRdHWfkVghM6zX7TmFDa96oMwY2whS5leXQ1Nl+oKBud786 7rBexbPPWXFvSh04MhESM6aPDVTzafv1eZZmLC/INflQVBGz9zoyiQqWAa5U113ylueh JdBzuTq4oTRPnY6r9A8LoGqlXEirfrNr4S2g4vi9Au2tpZAFiQzHG2pqdpjH+T9VvkYQ fvAw== X-Gm-Message-State: AFqh2kpJSrUo08/SXmf9VvLLWNt2hJS/uLYotsjk5nxmSDP27wKC+D2Y NdI/t5MtWxQvuOY7CsMGoMjVnhs5AIznqJ4cojQtADK4JsPB X-Google-Smtp-Source: AMrXdXuO3CQY5ZjeenXmvbOdoUvbLs/X9bRWO+oPSB47FksOmzeDhVBd8C8HNskDHwoZ3HxB4DG32J6FBgWuSMNvcdSb1TF+bqGv MIME-Version: 1.0 X-Received: by 2002:a02:3f01:0:b0:38a:95eb:e891 with SMTP id d1-20020a023f01000000b0038a95ebe891mr5095659jaa.51.1673074874239; Fri, 06 Jan 2023 23:01:14 -0800 (PST) Date: Fri, 06 Jan 2023 23:01:14 -0800 In-Reply-To: <20230107063010.4809-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008fd3b705f1a719c8@google.com> Subject: Re: [syzbot] BUG: unable to handle kernel paging request in p9_client_disconnect From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: unable to handle kernel paging request in percpu_ref_get_many Unable to handle kernel paging request at virtual address 0000ffff64000000 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010e408000 [0000ffff64000000] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 3885 Comm: dhcpcd-run-hook Not tainted 6.1.0-rc2-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __ref_is_percpu include/linux/percpu-refcount.h:174 [inline] pc : percpu_ref_get_many+0x64/0x140 include/linux/percpu-refcount.h:204 lr : rcu_read_lock include/linux/rcupdate.h:739 [inline] lr : percpu_ref_get_many+0x2c/0x140 include/linux/percpu-refcount.h:202 sp : ffff800012ddba00 x29: ffff800012ddba00 x28: 0000000000000005 x27: 00000000fffffff8 x26: ffff80000d2de560 x25: ffff80000d37d050 x24: 0000000000000000 x23: ffff0001fefcc560 x22: 0000000000000001 x21: ffff0000d04e0080 x20: 0000ffff64000000 x19: 0000000000000001 x18: fffffffffffffff5 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000002 x12: 0000000000000701 x11: ff808000095d1078 x10: 0000000000000000 x9 : ffff80000d2dd658 x8 : 0000000100000000 x7 : 0000000000000000 x6 : ffff800008579b18 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000000 x1 : ffff80000ce888e3 x0 : 0000000000000001 Call trace: rcu_read_lock include/linux/rcupdate.h:739 [inline] percpu_ref_get_many+0x64/0x140 include/linux/percpu-refcount.h:202 percpu_ref_get include/linux/percpu-refcount.h:222 [inline] obj_cgroup_get include/linux/memcontrol.h:779 [inline] refill_obj_stock+0x8c/0x254 mm/memcontrol.c:3327 obj_cgroup_uncharge+0x14/0x20 mm/memcontrol.c:3394 memcg_slab_free_hook+0x118/0x188 mm/slab.h:569 slab_free mm/slub.c:3656 [inline] kmem_cache_free+0xd8/0x3a4 mm/slub.c:3683 vm_area_free+0x38/0xe8 kernel/fork.c:485 remove_vma mm/mmap.c:144 [inline] exit_mmap+0x1f0/0x390 mm/mmap.c:3108 __mmput+0x90/0x204 kernel/fork.c:1185 mmput+0x64/0xa0 kernel/fork.c:1207 exit_mm+0x16c/0x1c0 kernel/exit.c:516 do_exit+0x264/0xcac kernel/exit.c:807 __arm64_sys_exit_group+0x0/0x18 kernel/exit.c:950 __do_sys_exit_group kernel/exit.c:961 [inline] __se_sys_exit_group kernel/exit.c:959 [inline] __wake_up_parent+0x0/0x40 kernel/exit.c:959 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 913af042 52805c81 39285909 97f0ad5f (f9400289) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 913af042 add x2, x2, #0xebc 4: 52805c81 mov w1, #0x2e4 // #740 8: 39285909 strb w9, [x8, #2582] c: 97f0ad5f bl 0xffffffffffc2b588 * 10: f9400289 ldr x9, [x20] <-- trapping instruction Tested on: commit: 247f34f7 Linux 6.1-rc2 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1695d26e480000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa9bed8d6a8992a0 dashboard link: https://syzkaller.appspot.com/bug?extid=ea8b28e8dca42fc3bcbe compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=1606acd2480000