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 7D6A3C433FE for ; Sat, 1 Oct 2022 13:47:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229582AbiJANrr (ORCPT ); Sat, 1 Oct 2022 09:47:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229502AbiJANrm (ORCPT ); Sat, 1 Oct 2022 09:47:42 -0400 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2B58AA373 for ; Sat, 1 Oct 2022 06:47:41 -0700 (PDT) Received: by mail-io1-f71.google.com with SMTP id v20-20020a6b5b14000000b0069fee36308eso4454876ioh.10 for ; Sat, 01 Oct 2022 06:47:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date; bh=wWqRs2lvuhafIzGCHY32E35K0kv47TyBxT5iP6LlkjI=; b=p8NqLEO1EQ7bcBQg39jAATh1SfHPZrn/l90ei53trb/9bP51gt0H672AEE3E+aAUh1 ONYWxjBvuyxrAJaoJ4fNZbXh8uZye46b7VZjVx4Fm0MsNk02iscIY36tPVlOtic4cHss HZInY2xvSIQp/y3kE4ZHlCzXfzAGRpNUg13ROE2S94YPucmbl5amQOLbJ5YbNVzO0TNQ tDlQdlZkgNEod3IHuYHPp79sBEYrzjKVrw++NhKoLZgrVfkIM4gNEqOtgYr8Nxewu9JN xfq/xMOReYmvcVS4ywJ7Dp2qv20HMwPdkfWQt27XWi767Fkw4V2ZGnB4uYfi+qavfoW+ FSpA== X-Gm-Message-State: ACrzQf3v25dCh4BRR+e7bVXBIxXrakMF4I1dAitDVxQVdDpUg2zUKhWo OucvGQeyxmoijqsxGaY+XypmDeS3i3ynLK3AKtOB7luqUf9e X-Google-Smtp-Source: AMsMyM79cUKVp1jlCtRp3+JmmB7BlDXfh6JgatmFKU3dpK0mFEjZN6hltNj+w7fl+ayLPsD9J18/ynQoNt8i4LuZznbcug6CHH2o MIME-Version: 1.0 X-Received: by 2002:a05:6602:2f15:b0:6a4:572a:d37d with SMTP id q21-20020a0566022f1500b006a4572ad37dmr5704512iow.20.1664632061063; Sat, 01 Oct 2022 06:47:41 -0700 (PDT) Date: Sat, 01 Oct 2022 06:47:41 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ae7bd605e9f95a47@google.com> Subject: [syzbot] WARNING: refcount bug in nilfs_put_root From: syzbot To: konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org, linux-nilfs@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 found the following issue on: HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=13ef3998880000 kernel config: https://syzkaller.appspot.com/x/.config?x=aae2d21e7dd80684 dashboard link: https://syzkaller.appspot.com/bug?extid=7b6d672e5810fec9e6eb 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 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=145c7a1f080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c843ef080000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/11078f50b80b/disk-bbed346d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/398e5f1e6c84/vmlinux-bbed346d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7b6d672e5810fec9e6eb@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 2048 ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 3038 at lib/refcount.c:87 refcount_dec_and_lock+0x180/0x1ec lib/refcount.c:146 Modules linked in: CPU: 1 PID: 3038 Comm: syz-executor274 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_dec_and_lock+0x180/0x1ec lib/refcount.c:146 lr : refcount_dec_not_one lib/refcount.c:87 [inline] lr : refcount_dec_and_lock+0x17c/0x1ec lib/refcount.c:146 sp : ffff800012893a30 x29: ffff800012893a30 x28: ffff80000cc15042 x27: ffff0000cc376640 x26: 0000000000000002 x25: 00000000ffffffff x24: 0000000000000000 x23: 00000000c0000000 x22: 0000000000000000 x21: ffff80000d5eb4a0 x20: ffff0000cc2b5520 x19: ffff80000d8c8000 x18: 00000000000000c0 x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c7128000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c7128000 x11: ff808000081c0d5c x10: 0000000000000000 x9 : 7c5041a976250900 x8 : 7c5041a976250900 x7 : ffff80000819545c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: refcount_dec_and_lock+0x180/0x1ec lib/refcount.c:146 nilfs_put_root+0x30/0x80 fs/nilfs2/the_nilfs.c:797 nilfs_segctor_destroy fs/nilfs2/segment.c:2747 [inline] nilfs_detach_log_writer+0x3b8/0x4d0 fs/nilfs2/segment.c:2810 nilfs_put_super+0x28/0x9c fs/nilfs2/super.c:468 generic_shutdown_super+0x8c/0x190 fs/super.c:491 kill_block_super+0x30/0x78 fs/super.c:1427 deactivate_locked_super+0x70/0xe8 fs/super.c:332 deactivate_super+0xd0/0xd4 fs/super.c:363 cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0xc4/0x14c kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x26c/0xbe0 kernel/exit.c:795 do_group_exit+0x60/0xe8 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __wake_up_parent+0x0/0x40 kernel/exit.c:934 __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 irq event stamp: 9228 hardirqs last enabled at (9227): [] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:264 hardirqs last disabled at (9228): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (7974): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (7972): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches