Hello, syzbot found the following issue on: HEAD commit: 7367539ad4b0 Merge tag 'cxl-fixes-6.9-rc7' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1553b31f180000 kernel config: https://syzkaller.appspot.com/x/.config?x=bbf567496022057b dashboard link: https://syzkaller.appspot.com/bug?extid=c123a98c7445baffb168 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/44fb709c4e9c/disk-7367539a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d25971073eca/vmlinux-7367539a.xz kernel image: https://storage.googleapis.com/syzbot-assets/a327aa91b63e/bzImage-7367539a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c123a98c7445baffb168@xxxxxxxxxxxxxxxxxxxxxxxxx bcachefs (loop4): done starting filesystem ===================================================== BUG: KMSAN: uninit-value in bch2_inode_unpack_v3 fs/bcachefs/inode.c:270 [inline] BUG: KMSAN: uninit-value in bch2_inode_unpack+0xaf0/0x4c40 fs/bcachefs/inode.c:323 bch2_inode_unpack_v3 fs/bcachefs/inode.c:270 [inline] bch2_inode_unpack+0xaf0/0x4c40 fs/bcachefs/inode.c:323 bch2_inode_peek_nowarn+0x4ec/0x5a0 fs/bcachefs/inode.c:351 bch2_inode_peek fs/bcachefs/inode.c:366 [inline] bch2_inode_find_by_inum_trans+0xb3/0x3d0 fs/bcachefs/inode.c:949 bch2_inode_find_by_inum+0x17b/0x4f0 fs/bcachefs/inode.c:958 bchfs_truncate+0x437/0x1420 fs/bcachefs/fs-io.c:421 bch2_setattr+0x29f/0x2f0 fs/bcachefs/fs.c:882 notify_change+0x1a07/0x1af0 fs/attr.c:497 do_truncate+0x22a/0x2b0 fs/open.c:65 handle_truncate fs/namei.c:3300 [inline] do_open fs/namei.c:3646 [inline] path_openat+0x50d9/0x5b00 fs/namei.c:3799 do_filp_open+0x20e/0x590 fs/namei.c:3826 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1432 x64_sys_call+0x3a64/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:258 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 Uninit was stored to memory at: memcpy_u64s_small fs/bcachefs/util.h:511 [inline] bkey_reassemble fs/bcachefs/bkey.h:505 [inline] btree_key_cache_fill fs/bcachefs/btree_key_cache.c:454 [inline] bch2_btree_path_traverse_cached_slowpath+0x5f02/0x79f0 fs/bcachefs/btree_key_cache.c:530 bch2_btree_path_traverse_cached+0xd1a/0x1140 bch2_btree_path_traverse_one+0x737/0x5290 fs/bcachefs/btree_iter.c:1155 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:225 [inline] bch2_btree_iter_peek_slot+0x128c/0x3840 fs/bcachefs/btree_iter.c:2473 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:549 [inline] bch2_bkey_get_iter fs/bcachefs/btree_iter.h:563 [inline] bch2_inode_peek_nowarn+0x208/0x5a0 fs/bcachefs/inode.c:340 bch2_inode_peek fs/bcachefs/inode.c:366 [inline] bch2_inode_find_by_inum_trans+0xb3/0x3d0 fs/bcachefs/inode.c:949 bch2_inode_find_by_inum+0x17b/0x4f0 fs/bcachefs/inode.c:958 bchfs_truncate+0x437/0x1420 fs/bcachefs/fs-io.c:421 bch2_setattr+0x29f/0x2f0 fs/bcachefs/fs.c:882 notify_change+0x1a07/0x1af0 fs/attr.c:497 do_truncate+0x22a/0x2b0 fs/open.c:65 handle_truncate fs/namei.c:3300 [inline] do_open fs/namei.c:3646 [inline] path_openat+0x50d9/0x5b00 fs/namei.c:3799 do_filp_open+0x20e/0x590 fs/namei.c:3826 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1432 x64_sys_call+0x3a64/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:258 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 Uninit was created at: __kmalloc_large_node+0x231/0x370 mm/slub.c:3921 __do_kmalloc_node mm/slub.c:3954 [inline] __kmalloc_node+0xb07/0x1060 mm/slub.c:3973 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+0x7adb/0x9310 fs/bcachefs/recovery.c:785 bch2_fs_start+0x7b2/0xbd0 fs/bcachefs/super.c:1043 bch2_fs_open+0x135f/0x1670 fs/bcachefs/super.c:2102 bch2_mount+0x90d/0x1d90 fs/bcachefs/fs.c:1903 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: 9730 Comm: syz-executor.4 Not tainted 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
