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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1fc4:b0:3a7:70a4:6877 with SMTP id e9e14a558f8ab-3c2d25669eemr132588125ab.7.1735056686066; Tue, 24 Dec 2024 08:11:26 -0800 (PST) Date: Tue, 24 Dec 2024 08:11:26 -0800 In-Reply-To: <674c1f93.050a0220.48a03.0009.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <676add2e.050a0220.2f3838.01e4.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_bkey_ptrs_validate 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: f07044dd0df0 Merge tag 'nfsd-6.13-1' of git://git.kernel.o.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=15997fe8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9048090d7bb0d06 dashboard link: https://syzkaller.appspot.com/bug?extid=5d8a06a9e86672d9f71f 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=13997fe8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1168c2f8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/079ebaf3a565/disk-f07044dd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/489a8d4db9f1/vmlinux-f07044dd.xz kernel image: https://storage.googleapis.com/syzbot-assets/a04386952d17/bzImage-f07044dd.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/449cac567e3a/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5d8a06a9e86672d9f71f@syzkaller.appspotmail.com bcachefs (loop0): snapshots_read... done bcachefs (loop0): check_allocations... done bcachefs (loop0): going read-write bcachefs (loop0): scanning for old btree nodes: min_version 0.24: unwritten_extents ===================================================== BUG: KMSAN: uninit-value in __extent_entry_type fs/bcachefs/extents.h:54 [inline] BUG: KMSAN: uninit-value in bch2_bkey_ptrs_validate+0x589/0x2df0 fs/bcachefs/extents.c:1239 __extent_entry_type fs/bcachefs/extents.h:54 [inline] bch2_bkey_ptrs_validate+0x589/0x2df0 fs/bcachefs/extents.c:1239 bch2_bkey_val_validate+0x2b5/0x440 fs/bcachefs/bkey_methods.c:143 bset_key_validate fs/bcachefs/btree_io.c:841 [inline] validate_bset_keys+0x1531/0x2080 fs/bcachefs/btree_io.c:910 validate_bset_for_write+0x142/0x290 fs/bcachefs/btree_io.c:1942 __bch2_btree_node_write+0x53df/0x6830 fs/bcachefs/btree_io.c:2152 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2284 bch2_btree_node_rewrite+0x1442/0x1930 fs/bcachefs/btree_update_interior.c:2179 bch2_move_btree+0xc32/0x1400 fs/bcachefs/move.c:865 bch2_scan_old_btree_nodes+0x15f/0x580 fs/bcachefs/move.c:995 bch2_fs_recovery+0x58b8/0x5b00 fs/bcachefs/recovery.c:974 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 Uninit was stored to memory at: memcpy_u64s_small fs/bcachefs/util.h:393 [inline] bkey_p_copy fs/bcachefs/bkey.h:47 [inline] bch2_sort_keys_keep_unwritten_whiteouts+0x12d5/0x19d0 fs/bcachefs/bkey_sort.c:187 __bch2_btree_node_write+0x3ae8/0x6830 fs/bcachefs/btree_io.c:2095 bch2_btree_node_write+0xa5/0x2e0 fs/bcachefs/btree_io.c:2284 bch2_btree_node_rewrite+0x1442/0x1930 fs/bcachefs/btree_update_interior.c:2179 bch2_move_btree+0xc32/0x1400 fs/bcachefs/move.c:865 bch2_scan_old_btree_nodes+0x15f/0x580 fs/bcachefs/move.c:995 bch2_fs_recovery+0x58b8/0x5b00 fs/bcachefs/recovery.c:974 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 Uninit was created at: ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4253 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4270 __do_kmalloc_node mm/slub.c:4286 [inline] __kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4304 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:650 btree_node_data_alloc fs/bcachefs/btree_cache.c:153 [inline] __bch2_btree_node_mem_alloc+0x2be/0xa80 fs/bcachefs/btree_cache.c:198 bch2_fs_btree_cache_init+0x4e4/0xb50 fs/bcachefs/btree_cache.c:653 bch2_fs_alloc fs/bcachefs/super.c:917 [inline] bch2_fs_open+0x4d3a/0x5b40 fs/bcachefs/super.c:2065 bch2_fs_get_tree+0x983/0x22d0 fs/bcachefs/fs.c:2157 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: 0 UID: 0 PID: 5789 Comm: syz-executor916 Not tainted 6.13.0-rc4-syzkaller-00004-gf07044dd0df0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- 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.