From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (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 2DE78152517 for ; Sat, 1 Jun 2024 16:53:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717260807; cv=none; b=aS7cscRshrPssFE8p6swx/z6GXKfWv1ciDLLoyPsuZdxoNPU8eVeLdBkmP+YU/bgiyTOxMlfB88gUo56dcllW5/OEA+HjlSmz25A1IthFd2lfzarFDL79wyq5qmc2RQjvyBmAo4XjaxMdHX2KwYECfY8Xj4HtMd7f8w4k+gN/+w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717260807; c=relaxed/simple; bh=EI5V98SfrdDxXjbmswq+Eb8dWw40UJc3HX69LMU8KLA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1fec:b0:373:8d34:4ad4 with SMTP id e9e14a558f8ab-3748ba27eefmr4402875ab.5.1717260805422; Sat, 01 Jun 2024 09:53:25 -0700 (PDT) Date: Sat, 01 Jun 2024 09:53:25 -0700 In-Reply-To: <000000000000633dce06194879ad@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004b51430619d6f084@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_alloc_v4_invalid From: syzbot To: bfoster@redhat.com, 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: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=15e19bd2980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=3b2968fa4953885dd66a 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=17a7d616980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14cfabd6980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/f1976dcc68c4/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3b2968fa4953885dd66a@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in bch2_alloc_v4_invalid+0x625/0x10f0 fs/bcachefs/alloc_background.c:247 bch2_alloc_v4_invalid+0x625/0x10f0 fs/bcachefs/alloc_background.c:247 bch2_bkey_val_invalid+0x24f/0x380 fs/bcachefs/bkey_methods.c:140 bset_key_invalid fs/bcachefs/btree_io.c:831 [inline] validate_bset_keys+0x12d8/0x25d0 fs/bcachefs/btree_io.c:904 validate_bset_for_write+0x1dd/0x340 fs/bcachefs/btree_io.c:1945 __bch2_btree_node_write+0x4777/0x67c0 fs/bcachefs/btree_io.c:2138 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2288 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline] __btree_node_flush+0x4d0/0x640 fs/bcachefs/btree_trans_commit.c:229 bch2_btree_node_flush0+0x35/0x60 fs/bcachefs/btree_trans_commit.c:238 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:553 __bch2_journal_reclaim+0xd88/0x1610 fs/bcachefs/journal_reclaim.c:685 bch2_journal_reclaim_thread+0x18e/0x760 fs/bcachefs/journal_reclaim.c:727 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 stored to memory at: memcpy_u64s_small fs/bcachefs/util.h:511 [inline] bkey_p_copy fs/bcachefs/bkey.h:46 [inline] bch2_sort_keys+0x1f34/0x2cb0 fs/bcachefs/bkey_sort.c:194 __bch2_btree_node_write+0x3acd/0x67c0 fs/bcachefs/btree_io.c:2100 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2288 btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline] __btree_node_flush+0x4d0/0x640 fs/bcachefs/btree_trans_commit.c:229 bch2_btree_node_flush0+0x35/0x60 fs/bcachefs/btree_trans_commit.c:238 journal_flush_pins+0xce6/0x1780 fs/bcachefs/journal_reclaim.c:553 __bch2_journal_reclaim+0xd88/0x1610 fs/bcachefs/journal_reclaim.c:685 bch2_journal_reclaim_thread+0x18e/0x760 fs/bcachefs/journal_reclaim.c:727 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+0x231/0x370 mm/slub.c:3994 __do_kmalloc_node mm/slub.c:4027 [inline] __kmalloc_node+0xb10/0x10c0 mm/slub.c:4046 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0xc0/0x2d0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] btree_bounce_alloc fs/bcachefs/btree_io.c:118 [inline] bch2_btree_node_read_done+0x4e68/0x75e0 fs/bcachefs/btree_io.c:1185 btree_node_read_work+0x8a5/0x1eb0 fs/bcachefs/btree_io.c:1324 bch2_btree_node_read+0x3d42/0x4b50 __bch2_btree_root_read fs/bcachefs/btree_io.c:1748 [inline] bch2_btree_root_read+0xa6c/0x13d0 fs/bcachefs/btree_io.c:1772 read_btree_roots+0x454/0xee0 fs/bcachefs/recovery.c:457 bch2_fs_recovery+0x7b6a/0x93e0 fs/bcachefs/recovery.c:785 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043 bch2_fs_open+0x152a/0x15f0 fs/bcachefs/super.c:2105 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1906 legacy_get_tree+0x114/0x290 fs/fs_context.c:662 vfs_get_tree+0xa7/0x570 fs/super.c:1779 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x742/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 PID: 5053 Comm: bch-reclaim/loo Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 ===================================================== --- 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.