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 F3EBBC001E0 for ; Thu, 19 Oct 2023 23:56:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346764AbjJSX4A (ORCPT ); Thu, 19 Oct 2023 19:56:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346733AbjJSXzx (ORCPT ); Thu, 19 Oct 2023 19:55:53 -0400 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50EFE11D for ; Thu, 19 Oct 2023 16:55:51 -0700 (PDT) Received: by mail-ot1-f77.google.com with SMTP id 46e09a7af769-6ce270bc429so344232a34.2 for ; Thu, 19 Oct 2023 16:55:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697759750; x=1698364550; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=uWSEJ9xYUbBy9cya3rocEpazxIwASpRVIWUfmU2j3cg=; b=tYW3Db3Kuw563KIvzh8pDLHDTuvNunVDnv/H42IJHL+ibp9CDDyOyQ7FmxbSozoKJS qgsU359w/jmS+GtnQHcIRm82wwFP376g64jGBuzEHNrV/CVxBnzo3OmOnJoX6w9yZTYw 5c9USluRhb2Ued+5eSz9Vd1E8FZ1Yls6njb/XG01N5BUQLYhb+7r73kZDBHm95FsgsiA IYBbT/oA8rO9a8tej9oGOS6TBkJWv7iOyWBGvkVF6RU6CxH0Brz8R/rAUEpQS506Q93t V8hYpliYYi9uxQ2jUBcUdjgm4v7ZyJDcdHKF+9e3TyU8WsVrr0RSdXDFIXIQl3pWcVJN tkcQ== X-Gm-Message-State: AOJu0YwIEPjl77BP/S0muJdO4jcQRESeT6AYtG0JkPCNBehTpeZUrL9l eOpIEhK784pblbkNkoDA9Bxef49hiAm7jvjE0OdZweKfYenl X-Google-Smtp-Source: AGHT+IHDp+QRpTSXHAcCvBFlVlpv+f4IueDYjCTJbN2MkjKh0HDR371FxFBBYf9bJ1/GU7TLewxDySYgN7G3P+ho725Ufj7j0low MIME-Version: 1.0 X-Received: by 2002:a9d:7518:0:b0:6b9:5156:a493 with SMTP id r24-20020a9d7518000000b006b95156a493mr57782otk.4.1697759750681; Thu, 19 Oct 2023 16:55:50 -0700 (PDT) Date: Thu, 19 Oct 2023 16:55:50 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000da80e106081a7eed@google.com> Subject: [syzbot] [btrfs?] WARNING: refcount bug in btrfs_evict_inode (2) From: syzbot To: clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, 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 found the following issue on: HEAD commit: 9a3dad63edbe Merge tag '6.6-rc5-ksmbd-server-fixes' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=126116e5680000 kernel config: https://syzkaller.appspot.com/x/.config?x=11e478e28144788c dashboard link: https://syzkaller.appspot.com/bug?extid=3968e6b73153451563ef compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=139d2f55680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/33c965444183/disk-9a3dad63.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/337f5c485902/vmlinux-9a3dad63.xz kernel image: https://storage.googleapis.com/syzbot-assets/4c5f5b84773a/bzImage-9a3dad63.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/263d3fb612d5/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3968e6b73153451563ef@syzkaller.appspotmail.com ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 5068 at lib/refcount.c:28 refcount_warn_saturate+0x144/0x1b0 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 5068 Comm: syz-executor.4 Not tainted 6.6.0-rc5-syzkaller-00267-g9a3dad63edbe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:refcount_warn_saturate+0x144/0x1b0 lib/refcount.c:28 Code: 0a 01 48 c7 c7 a0 30 59 8b e8 98 97 15 fd 0f 0b eb a9 e8 cf 74 4f fd c6 05 64 cc 46 0a 01 48 c7 c7 00 31 59 8b e8 7c 97 15 fd <0f> 0b eb 8d e8 b3 74 4f fd c6 05 45 cc 46 0a 01 48 c7 c7 40 30 59 RSP: 0018:ffffc9000410f9c8 EFLAGS: 00010246 RAX: 87d3e0a2fce9e500 RBX: ffff8880283d7108 RCX: ffff88807b601dc0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000003 R08: ffffffff81543302 R09: 1ffff1101732516a R10: dffffc0000000000 R11: ffffed101732516b R12: ffff888027e3c000 R13: 0000000000000000 R14: ffff8880793fa1fe R15: 1ffff1100d13240f FS: 0000555555d3f480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555d48938 CR3: 000000002a44c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_evict_inode+0x724/0x1000 fs/btrfs/inode.c:5305 evict+0x2a4/0x620 fs/inode.c:664 dispose_list fs/inode.c:697 [inline] evict_inodes+0x5f8/0x690 fs/inode.c:747 generic_shutdown_super+0x9d/0x2c0 fs/super.c:672 kill_anon_super+0x3b/0x70 fs/super.c:1292 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2144 deactivate_locked_super+0xa4/0x110 fs/super.c:481 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdf2aa7de17 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff45f80ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fdf2aa7de17 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fff45f80da0 RBP: 00007fff45f80da0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff45f81e60 R13: 00007fdf2aac73b9 R14: 000000000006a985 R15: 0000000000000003 --- 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. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup