From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f206.google.com (mail-il1-f206.google.com [209.85.166.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41C5A222591 for ; Wed, 26 Feb 2025 15:14:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740582868; cv=none; b=W9EBWpYYMZIhbJGqg/rp3FaGiRnn22+B0d2sbsddVG/1MIdl81YqiClkLmYyTHBO02/YmFfV4hQ5hilZl6dBOUGRSA2rErAIZL5OUdZ1P77iyj64SnTvvlhooESCgdijffNEefJF98+v1+l4nZGtxg0OaFz9Nt376CPb9na8TFU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740582868; c=relaxed/simple; bh=ZSjf+72l4ULpS9+WjRMnaULwTrJ3p4O6jvlFCqeY2GA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:4813:b0:3d3:d994:e92e with SMTP id e9e14a558f8ab-3d3d994ea94mr9224315ab.17.1740582866377; Wed, 26 Feb 2025 07:14:26 -0800 (PST) Date: Wed, 26 Feb 2025 07:14:26 -0800 In-Reply-To: <674c2f0c.050a0220.ad585.0034.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67bf2fd2.050a0220.1ebef.0023.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_btree_node_get From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: ac9c34d1e45a Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=17a4f7a4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d66f6f82ee090382 dashboard link: https://syzkaller.appspot.com/bug?extid=2b2046c73fcb7e6a0e4e 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=11da9c98580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=177a003f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c756243ff2fa/disk-ac9c34d1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/47bd399bb287/vmlinux-ac9c34d1.xz kernel image: https://storage.googleapis.com/syzbot-assets/b6c5db9fcba1/bzImage-ac9c34d1.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/039e65b899b2/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2b2046c73fcb7e6a0e4e@syzkaller.appspotmail.com bucket 0:127 gen 0 has wrong data_type: got free, should be sb, fixing bucket 0:127 gen 0 data type sb has wrong dirty_sectors: got 0, should be 256, fixing done bcachefs (loop0): going read-write bcachefs (loop0): journal_replay... ===================================================== BUG: KMSAN: uninit-value in bch2_btree_node_get+0x5ed/0x1970 fs/bcachefs/btree_cache.c:1180 bch2_btree_node_get+0x5ed/0x1970 fs/bcachefs/btree_cache.c:1180 btree_path_down fs/bcachefs/btree_iter.c:976 [inline] bch2_btree_path_traverse_one+0x283d/0x4790 fs/bcachefs/btree_iter.c:1202 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:249 [inline] bch2_btree_iter_traverse+0xbb8/0x1110 fs/bcachefs/btree_iter.c:1913 bch2_journal_replay_key+0x28a/0x13f0 fs/bcachefs/recovery.c:264 bch2_journal_replay+0x301d/0x4e20 fs/bcachefs/recovery.c:373 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:226 [inline] bch2_run_recovery_passes+0x5a2/0x1160 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x489c/0x6230 fs/bcachefs/recovery.c:936 bch2_fs_start+0x7ca/0xc20 fs/bcachefs/super.c:1041 bch2_fs_get_tree+0x1564/0x24e0 fs/bcachefs/fs.c:2203 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560 path_mount+0x742/0x1f10 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x71f/0x800 fs/namespace.c:4088 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: memcpy_u64s_small fs/bcachefs/util.h:416 [inline] bkey_reassemble fs/bcachefs/bkey.h:506 [inline] bch2_bkey_buf_reassemble fs/bcachefs/bkey_buf.h:28 [inline] btree_node_iter_and_journal_peek+0x889/0x2560 fs/bcachefs/btree_iter.c:918 btree_path_down fs/bcachefs/btree_iter.c:947 [inline] bch2_btree_path_traverse_one+0x2131/0x4790 fs/bcachefs/btree_iter.c:1202 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:249 [inline] bch2_btree_iter_traverse+0xbb8/0x1110 fs/bcachefs/btree_iter.c:1913 bch2_journal_replay_key+0x28a/0x13f0 fs/bcachefs/recovery.c:264 bch2_journal_replay+0x301d/0x4e20 fs/bcachefs/recovery.c:373 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:226 [inline] bch2_run_recovery_passes+0x5a2/0x1160 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x489c/0x6230 fs/bcachefs/recovery.c:936 bch2_fs_start+0x7ca/0xc20 fs/bcachefs/super.c:1041 bch2_fs_get_tree+0x1564/0x24e0 fs/bcachefs/fs.c:2203 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560 path_mount+0x742/0x1f10 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x71f/0x800 fs/namespace.c:4088 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4249 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4266 __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4300 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:662 btree_node_data_alloc fs/bcachefs/btree_cache.c:156 [inline] bch2_btree_node_mem_alloc+0xa72/0x2ee0 fs/bcachefs/btree_cache.c:834 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:304 [inline] bch2_btree_reserve_get+0x37f/0x2290 fs/bcachefs/btree_update_interior.c:532 bch2_btree_update_start+0x2b0e/0x2d60 fs/bcachefs/btree_update_interior.c:1251 bch2_btree_split_leaf+0x120/0xc90 fs/bcachefs/btree_update_interior.c:1853 bch2_trans_commit_error+0x1c0/0x1d60 fs/bcachefs/btree_trans_commit.c:908 __bch2_trans_commit+0x1d5f/0xd310 fs/bcachefs/btree_trans_commit.c:1089 bch2_trans_commit fs/bcachefs/btree_update.h:183 [inline] bch2_journal_replay+0x3125/0x4e20 fs/bcachefs/recovery.c:373 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:226 [inline] bch2_run_recovery_passes+0x5a2/0x1160 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x489c/0x6230 fs/bcachefs/recovery.c:936 bch2_fs_start+0x7ca/0xc20 fs/bcachefs/super.c:1041 bch2_fs_get_tree+0x1564/0x24e0 fs/bcachefs/fs.c:2203 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560 path_mount+0x742/0x1f10 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x71f/0x800 fs/namespace.c:4088 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5784 Comm: syz-executor148 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ===================================================== --- 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.