erofs: (device loop6): z_erofs_readahead: readahead error at page 4 @ nid 89 erofs: (device loop6): z_erofs_readahead: readahead error at page 3 @ nid 89 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_to_page include/linux/highmem.h:403 [inline] BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347 Read of size 4096 at addr ffff0000d592c000 by task syz.6.803/8534 CPU: 1 PID: 8534 Comm: syz.6.803 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memcpy+0x48/0x90 mm/kasan/shadow.c:65 memcpy_to_page include/linux/highmem.h:403 [inline] z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:435 z_erofs_decompress_pcluster fs/erofs/zdata.c:1161 [inline] z_erofs_decompress_queue+0x103c/0x1bf4 fs/erofs/zdata.c:1242 z_erofs_runqueue+0x1508/0x16a8 fs/erofs/zdata.c:1614 z_erofs_read_folio+0x2dc/0x5cc fs/erofs/zdata.c:1704 filemap_read_folio+0x134/0x384 mm/filemap.c:2490 filemap_update_page mm/filemap.c:2575 [inline] filemap_get_pages mm/filemap.c:2689 [inline] filemap_read+0x1290/0x20dc mm/filemap.c:2759 generic_file_read_iter+0xf8/0x5ac mm/filemap.c:2941 call_read_iter include/linux/fs.h:2265 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x3cc/0x7b8 fs/read_write.c:470 ksys_read+0x12c/0x228 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 Allocated by task 6513: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x430 mm/slab.h:742 slab_alloc_node mm/slub.c:3366 [inline] slab_alloc mm/slub.c:3374 [inline] __kmem_cache_alloc_lru mm/slub.c:3381 [inline] kmem_cache_alloc+0x234/0x310 mm/slub.c:3390 kmem_cache_zalloc include/linux/slab.h:689 [inline] __kernfs_new_node+0xec/0x5fc fs/kernfs/dir.c:614 kernfs_new_node+0x120/0x230 fs/kernfs/dir.c:690 __kernfs_create_file+0x60/0x2e0 fs/kernfs/file.c:1068 sysfs_add_file_mode_ns+0x1e8/0x2a4 fs/sysfs/file.c:298 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x3e8/0xb24 fs/sysfs/group.c:148 internal_create_groups fs/sysfs/group.c:188 [inline] sysfs_create_groups+0x60/0x134 fs/sysfs/group.c:214 create_dir lib/kobject.c:68 [inline] kobject_add_internal+0x5e4/0xb18 lib/kobject.c:231 kobject_add_varg lib/kobject.c:366 [inline] kobject_init_and_add+0x128/0x194 lib/kobject.c:449 netdev_queue_add_kobject net/core/net-sysfs.c:1664 [inline] netdev_queue_update_kobjects+0x1e0/0x444 net/core/net-sysfs.c:1716 register_queue_kobjects net/core/net-sysfs.c:1777 [inline] netdev_register_kobject+0x240/0x2f4 net/core/net-sysfs.c:2017 register_netdevice+0xf28/0x1650 net/core/dev.c:10266 rtnl_newlink_create net/core/rtnetlink.c:3438 [inline] __rtnl_newlink net/core/rtnetlink.c:3656 [inline] rtnl_newlink+0x1234/0x1af0 net/core/rtnetlink.c:3669 rtnetlink_rcv_msg+0x694/0xcc4 net/core/rtnetlink.c:6166 netlink_rcv_skb+0x220/0x3ec net/netlink/af_netlink.c:2516 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6184 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5fc/0x80c net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6f0/0x9d8 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x324/0x440 net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __arm64_sys_sendto+0xe4/0x104 net/socket.c:2161 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 The buggy address belongs to the object at ffff0000d592c000 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 0 bytes inside of 168-byte region [ffff0000d592c000, ffff0000d592c0a8) The buggy address belongs to the physical page: page:000000003a5d0c54 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11592c flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c0858a80 raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d592bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d592c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000d592c080: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 ^ ffff0000d592c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d592c180: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ==================================================================