================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff888130605eb8 by task kworker/u4:4/595 CPU: 1 PID: 595 Comm: kworker/u4:4 Not tainted 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:1736 ext4_xattr_ibody_set+0x114/0x330 fs/ext4/xattr.c:2238 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:ffffea0004c18140 refcount:2 mapcount:0 mapping:ffff8881093024d8 index:0x3 pfn:0x130605 memcg:ffff8881002533c0 aops:def_blk_aops ino:700000 flags: 0x4000000000022036(referenced|uptodate|lru|active|private|mappedtodisk|zone=1) raw: 4000000000022036 ffffea0004978108 ffffea00049780c8 ffff8881093024d8 raw: 0000000000000003 ffff888129022690 00000002ffffffff ffff8881002533c0 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 316, ts 60009839751, free_ts 60006215386 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+0x2c3a/0x2cd0 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] page_cache_ra_unbounded+0x2bc/0x960 mm/readahead.c:227 do_page_cache_ra mm/readahead.c:280 [inline] force_page_cache_ra+0x406/0x460 mm/readahead.c:312 page_cache_sync_ra+0x2b4/0x430 mm/readahead.c:590 page_cache_sync_readahead include/linux/pagemap.h:831 [inline] filemap_get_pages mm/filemap.c:2569 [inline] filemap_read+0x69e/0x20c0 mm/filemap.c:2654 generic_file_read_iter+0xac/0x420 mm/filemap.c:2814 blkdev_read_iter+0x12f/0x160 block/fops.c:563 call_read_iter include/linux/fs.h:2206 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c0/0xc20 fs/read_write.c:485 ksys_read+0x14a/0x260 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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+0x138/0x9e0 mm/page_alloc.c:3671 release_pages+0x1264/0x12c0 mm/swap.c:1015 __pagevec_release+0x71/0xe0 mm/swap.c:1035 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0xcba/0xe50 mm/truncate.c:404 truncate_inode_pages+0x24/0x30 mm/truncate.c:428 kill_bdev block/bdev.c:80 [inline] set_blocksize+0x2ed/0x360 block/bdev.c:160 sb_set_blocksize block/bdev.c:169 [inline] sb_min_blocksize+0xe8/0x1b0 block/bdev.c:185 ext4_fill_super+0x5fe/0x8bf0 fs/ext4/super.c:3980 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+0x25a/0xa30 fs/namespace.c:3034 path_mount+0x640/0xff0 fs/namespace.c:3364 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3562 Memory state around the buggy address: ffff888130605d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888130605e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888130605e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888130605f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888130605f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop0): ext4_read_block_bitmap_nowait:485: Cannot get buffer for block bitmap - block_group = 0, block_bitmap = 1856 EXT4-fs warning (device loop0): ext4_read_block_bitmap_nowait:485: Cannot get buffer for block bitmap - block_group = 0, block_bitmap = 1856 EXT4-fs warning (device loop0): ext4_read_block_bitmap_nowait:485: Cannot get buffer for block bitmap - block_group = 0, block_bitmap = 1856