================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 Read of size 18446744073709551600 at addr ffff88810ccc52b8 by task syz.2.185/1096 CPU: 1 PID: 1096 Comm: syz.2.185 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 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+0x1326/0x3860 fs/ext4/xattr.c:1729 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2229 ext4_destroy_inline_data_nolock+0x20f/0x5e0 fs/ext4/inline.c:464 ext4_convert_inline_data_to_extent fs/ext4/inline.c:629 [inline] ext4_try_to_write_inline_data+0x6d0/0x11f0 fs/ext4/inline.c:769 ext4_write_begin+0x246/0x1690 fs/ext4/inode.c:1192 ext4_da_write_begin+0x478/0xf10 fs/ext4/inode.c:3033 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x758/0xdc0 fs/read_write.c:605 ksys_pwrite64 fs/read_write.c:712 [inline] __do_sys_pwrite64 fs/read_write.c:722 [inline] __se_sys_pwrite64 fs/read_write.c:719 [inline] __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:719 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f228a530799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2288f8b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f228a7a9fa0 RCX: 00007f228a530799 RDX: 0000000000000002 RSI: 0000200000000800 RDI: 0000000000000008 RBP: 00007f228a5c6c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008080c61 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f228a7aa038 R14: 00007f228a7a9fa0 R15: 00007ffd7e830ff8 The buggy address belongs to the page: page:ffffea0004333140 refcount:4 mapcount:1 mapping:ffff88810044ad10 index:0x2 pfn:0x10ccc5 aops:def_blk_aops ino:0 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk) raw: 400000000002203e ffffea00043c7908 ffffea00043b9a48 ffff88810044ad10 raw: 0000000000000002 ffff88811cbef2a0 0000000400000000 ffff888128c4e000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888128c4e000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x108c40(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL), pid 1096, ts 86701147587, free_ts 86440293110 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x63e/0x930 mm/filemap.c:1848 find_or_create_page include/linux/pagemap.h:402 [inline] grow_dev_page fs/buffer.c:976 [inline] grow_buffers fs/buffer.c:1045 [inline] __getblk_slow fs/buffer.c:1072 [inline] __getblk_gfp+0x212/0x780 fs/buffer.c:1370 sb_getblk_gfp include/linux/buffer_head.h:368 [inline] ext4_sb_breadahead_unmovable+0x6b/0xe0 fs/ext4/super.c:240 __ext4_get_inode_loc+0x8dc/0xc30 fs/ext4/inode.c:4528 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4559 [inline] __ext4_iget+0x495/0x44c0 fs/ext4/inode.c:4809 ext4_fill_super+0x6f30/0x8d70 fs/ext4/super.c:4954 mount_bdev+0x28b/0x3a0 fs/super.c:1442 ext4_mount+0x34/0x40 fs/ext4/super.c:6661 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:3006 path_mount+0x585/0xc90 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x129/0x9c0 mm/page_alloc.c:3443 release_pages+0xe52/0xea0 mm/swap.c:1103 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] truncate_inode_pages_range+0x819/0x16d0 mm/truncate.c:367 truncate_inode_pages mm/truncate.c:473 [inline] truncate_inode_pages_final+0xc0/0xd0 mm/truncate.c:524 f2fs_evict_inode+0x17a/0x14e0 fs/f2fs/inode.c:764 evict+0x4ae/0x930 fs/inode.c:612 dispose_list fs/inode.c:647 [inline] evict_inodes+0x5dc/0x650 fs/inode.c:701 generic_shutdown_super+0x96/0x320 fs/super.c:454 kill_block_super+0x7f/0xf0 fs/super.c:1469 kill_f2fs_super+0x303/0x3b0 fs/f2fs/super.c:4630 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130 Memory state around the buggy address: ffff88810ccc5180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810ccc5200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810ccc5280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88810ccc5300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810ccc5380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop2): ext4_read_block_bitmap_nowait:476: comm syz.2.185: Invalid block bitmap block 48142 in block_group 0