From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) (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 34449440C for ; Tue, 26 Nov 2024 01:38:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732585114; cv=none; b=O+vD/c24FR9lqrw5UzJI99K0UlelJQ/4xBEYeF6J5lBBzxjBMGA71MB2MC6Cbc16LuWJK8eZzSswnCJwv8shqdLh0CxMSuFrPFEFNOUrS1+Nf4MFnAW7NCfHGyOAw8xduFP7/WjN7gvpI0okGeyzjLkqHfdFlUWGF/rcGWQ3FJs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732585114; c=relaxed/simple; bh=gSsHLbX/xNRwyXFYmNEsWG1huu5G/yNkh92Z06JWT+s=; 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:a05:6e02:2186:b0:3a6:cac0:1299 with SMTP id e9e14a558f8ab-3a79ae65220mr156675425ab.14.1732585112285; Mon, 25 Nov 2024 17:38:32 -0800 (PST) Date: Mon, 25 Nov 2024 17:38:32 -0800 In-Reply-To: <672b7604.050a0220.350062.0255.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67452698.050a0220.1286eb.000c.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_bucket_alloc_early 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: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13600f5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=ce1e2eda2213557 dashboard link: https://syzkaller.appspot.com/bug?extid=07d7911319bd613ba885 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=148215c0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17600f5f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2fcdec73c0f3/disk-9f16d5e6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d4dc8d1847e1/vmlinux-9f16d5e6.xz kernel image: https://storage.googleapis.com/syzbot-assets/db0e04822d2c/bzImage-9f16d5e6.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e5d1dbb2ef68/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+07d7911319bd613ba885@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in bch2_alloc_to_v4 fs/bcachefs/alloc_background.h:235 [inline] BUG: KMSAN: uninit-value in bch2_bucket_alloc_early+0x11c0/0x2520 fs/bcachefs/alloc_foreground.c:439 bch2_alloc_to_v4 fs/bcachefs/alloc_background.h:235 [inline] bch2_bucket_alloc_early+0x11c0/0x2520 fs/bcachefs/alloc_foreground.c:439 bch2_bucket_alloc_trans+0x8e6/0x3fb0 fs/bcachefs/alloc_foreground.c:649 bch2_bucket_alloc_set_trans+0x959/0x1650 fs/bcachefs/alloc_foreground.c:808 __open_bucket_add_buckets+0x1dec/0x3070 fs/bcachefs/alloc_foreground.c:1057 open_bucket_add_buckets+0x328/0x530 fs/bcachefs/alloc_foreground.c:1101 bch2_alloc_sectors_start_trans+0x1833/0x32b0 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:339 [inline] bch2_btree_reserve_get+0x9d6/0x2290 fs/bcachefs/btree_update_interior.c:549 bch2_btree_update_start+0x1af9/0x2d60 fs/bcachefs/btree_update_interior.c:1247 bch2_btree_split_leaf+0x120/0xc00 fs/bcachefs/btree_update_interior.c:1856 bch2_trans_commit_error+0x1c0/0x1d60 fs/bcachefs/btree_trans_commit.c:942 __bch2_trans_commit+0x210f/0xd190 fs/bcachefs/btree_trans_commit.c:1140 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:723 [inline] btree_interior_update_work+0x2080/0x4870 fs/bcachefs/btree_update_interior.c:861 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4219 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4236 __do_kmalloc_node mm/slub.c:4252 [inline] __kmalloc_node_noprof+0x9d6/0xf50 mm/slub.c:4270 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:658 btree_node_data_alloc fs/bcachefs/btree_cache.c:153 [inline] bch2_btree_node_mem_alloc+0xa72/0x2ee0 fs/bcachefs/btree_cache.c:832 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:321 [inline] bch2_btree_reserve_get+0x37f/0x2290 fs/bcachefs/btree_update_interior.c:549 bch2_btree_update_start+0x1af9/0x2d60 fs/bcachefs/btree_update_interior.c:1247 bch2_btree_split_leaf+0x120/0xc00 fs/bcachefs/btree_update_interior.c:1856 bch2_trans_commit_error+0x1c0/0x1d60 fs/bcachefs/btree_trans_commit.c:942 __bch2_trans_commit+0x210f/0xd190 fs/bcachefs/btree_trans_commit.c:1140 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline] bch2_journal_replay+0x2e3d/0x4d30 fs/bcachefs/recovery.c:317 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:191 [inline] bch2_run_recovery_passes+0xaf9/0xf80 fs/bcachefs/recovery_passes.c:244 bch2_fs_recovery+0x447b/0x5b00 fs/bcachefs/recovery.c:861 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1037 bch2_fs_get_tree+0x13ea/0x22d0 fs/bcachefs/fs.c:2170 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507 path_mount+0x742/0x1f10 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x722/0x810 fs/namespace.c:4034 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034 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: 1 UID: 0 PID: 3546 Comm: kworker/u8:9 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btree_update btree_interior_update_work ===================================================== --- 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.