================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1738 Read of size 18446744073709551600 at addr ffff8881346ebeb8 by task kworker/u4:5/578 CPU: 1 PID: 578 Comm: kworker/u4:5 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: writeback wb_workfn (flush-7:0) 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+0x10f/0x150 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+0x11db/0x3a80 fs/ext4/xattr.c:1738 ext4_xattr_ibody_set+0x114/0x330 fs/ext4/xattr.c:2240 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_destroy_inline_data+0x84/0xe0 fs/ext4/inline.c:1915 ext4_writepages+0x64c/0x30a0 fs/ext4/inode.c:2750 do_writepages+0x476/0x6d0 mm/page-writeback.c:2388 __writeback_single_inode+0xd9/0x9e0 fs/fs-writeback.c:1657 writeback_sb_inodes+0x9f3/0x1610 fs/fs-writeback.c:1940 wb_writeback+0x3eb/0x990 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+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the page: page:ffffea0004d1bac0 refcount:2 mapcount:0 mapping:ffff88810930ea98 index:0x2 pfn:0x1346eb memcg:ffff8881002533c0 aops:def_blk_aops ino:700000 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea0004deeb08 ffffea000486a008 ffff88810930ea98 raw: 0000000000000002 ffff888131d29c78 00000002ffffffff ffff8881002533c0 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 3364, ts 167207636593, free_ts 165771695813 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 __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+0xacc/0xdd0 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+0x231/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x45b/0xcb0 fs/ext4/inode.c:4370 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4478 [inline] __ext4_iget+0x448/0x3e80 fs/ext4/inode.c:4733 ext4_fill_super+0x6b8f/0x8bf0 fs/ext4/super.c:4863 mount_bdev+0x28d/0x3c0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6650 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x251/0xb40 fs/namespace.c:3037 path_mount+0x640/0xff0 fs/namespace.c:3367 do_mount fs/namespace.c:3380 [inline] __do_sys_mount fs/namespace.c:3588 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3565 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page_list+0x138/0x9e0 mm/page_alloc.c:3673 release_pages+0x1264/0x12c0 mm/swap.c:1015 __pagevec_release+0x71/0xe0 mm/swap.c:1035 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x564/0x13b0 mm/shmem.c:965 shmem_truncate_range mm/shmem.c:1064 [inline] shmem_evict_inode+0x1dc/0x970 mm/shmem.c:1146 evict+0x4b6/0x8b0 fs/inode.c:650 iput_final fs/inode.c:1779 [inline] iput+0x651/0x7e0 fs/inode.c:1805 dentry_unlink_inode+0x338/0x3e0 fs/dcache.c:380 __dentry_kill+0x45b/0x660 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x47/0x90 fs/dcache.c:893 __fput+0x5c7/0x900 fs/file_table.c:319 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 Memory state around the buggy address: ffff8881346ebd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881346ebe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881346ebe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881346ebf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881346ebf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop0): ext4_validate_block_bitmap:438: comm kworker/u4:5: bg 0: block 1024: padding at end of block bitmap is not set EXT4-fs (loop0): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 1 with error 28 EXT4-fs (loop0): This should not happen!! Data will be lost EXT4-fs (loop0): Total free blocks count 0 EXT4-fs (loop0): Free/Dirty block details EXT4-fs (loop0): free_blocks=0 EXT4-fs (loop0): dirty_blocks=32 EXT4-fs (loop0): Block reservation details EXT4-fs (loop0): i_reserved_data_blocks=2 EXT4-fs (loop0): Delayed block allocation failed for inode 15 at logical offset 65793 with max blocks 1 with error 28 EXT4-fs (loop0): This should not happen!! Data will be lost