================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881201df2b8 by task kworker/u4:2/45 CPU: 0 PID: 45 Comm: kworker/u4:2 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: writeback wb_workfn (flush-7:6) Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_destroy_inline_data+0x84/0xe0 fs/ext4/inline.c:1915 ext4_writepages+0x64f/0x3090 fs/ext4/inode.c:2748 do_writepages+0x473/0x6c0 mm/page-writeback.c:2388 __writeback_single_inode+0xd5/0x9c0 fs/fs-writeback.c:1657 writeback_sb_inodes+0xa10/0x1610 fs/fs-writeback.c:1940 wb_writeback+0x40b/0x9d0 fs/fs-writeback.c:2116 wb_do_writeback fs/fs-writeback.c:2263 [inline] wb_workfn+0x3ac/0xf30 fs/fs-writeback.c:2304 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the page: page:ffffea00048077c0 refcount:2 mapcount:0 mapping:ffff8881092c85d8 index:0x2 pfn:0x1201df memcg:ffff88810d5e6780 aops:def_blk_aops ino:700006 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea000488e888 ffffea000448ae48 ffff8881092c85d8 raw: 0000000000000002 ffff88812959b348 00000002ffffffff ffff88810d5e6780 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 10134, ts 331992208795, free_ts 331924293043 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xac6/0xde0 mm/filemap.c:1955 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x238/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x46e/0xcd0 fs/ext4/inode.c:4363 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4471 [inline] __ext4_iget+0x448/0x3e50 fs/ext4/inode.c:4726 ext4_orphan_get+0x1e4/0x630 fs/ext4/ialloc.c:1400 ext4_orphan_cleanup+0x8a7/0x10f0 fs/ext4/orphan.c:465 ext4_fill_super+0x84ab/0x8bd0 fs/ext4/super.c:4991 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6648 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x25a/0xa20 fs/namespace.c:3034 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page_list+0x13a/0x9d0 mm/page_alloc.c:3671 release_pages+0x1006/0x1060 mm/swap.c:1015 __pagevec_release+0x71/0xe0 mm/swap.c:1035 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x595/0x1470 mm/shmem.c:965 shmem_truncate_range mm/shmem.c:1064 [inline] shmem_evict_inode+0x21a/0xa10 mm/shmem.c:1146 evict+0x4c9/0x8d0 fs/inode.c:650 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 dentry_unlink_inode+0x32f/0x3e0 fs/dcache.c:380 __dentry_kill+0x44f/0x650 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x47/0x90 fs/dcache.c:893 __fput+0x580/0x8b0 fs/file_table.c:319 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa9e/0x27e0 kernel/exit.c:889 Memory state around the buggy address: ffff8881201df180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881201df200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881201df280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881201df300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881201df380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================