================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xaf2/0x21d0 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff8881183baeb8 by task syz.4.4203/13879 CPU: 0 PID: 13879 Comm: syz.4.4203 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 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+0xaf2/0x21d0 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x24e/0x6c0 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:620 [inline] ext4_try_to_write_inline_data+0x75a/0x12e0 fs/ext4/inline.c:761 ext4_write_begin+0x1f0/0xf90 fs/ext4/inode.c:1205 ext4_da_write_begin+0x3e7/0x8c0 fs/ext4/inode.c:3001 generic_perform_write+0x32d/0x740 mm/filemap.c:3913 ext4_buffered_write_iter+0x367/0x630 fs/ext4/file.c:285 ext4_file_write_iter+0x191/0x1500 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x603/0xce0 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:706 x64_sys_call+0x36/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fee7bf9c819 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:00007fee7cf14028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fee7c215fa0 RCX: 00007fee7bf9c819 RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007fee7c032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fee7c216038 R14: 00007fee7c215fa0 R15: 00007ffd806f0af8 The buggy address belongs to the physical page: page:ffffea000460ee80 refcount:3 mapcount:1 mapping:ffff88810048b2d0 index:0x70 pfn:0x1183ba memcg:ffff888112cbc440 aops:def_blk_aops ino:700004 flags: 0x660000000002205e(referenced|uptodate|dirty|lru|workingset|private|mappedtodisk|zone=1) raw: 660000000002205e ffffea0004aa5648 ffffea0004d56608 ffff88810048b2d0 raw: 0000000000000070 ffff8881408283f0 0000000300000000 ffff888112cbc440 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 13879, tgid 13877 (syz.4.4203), ts 502715227306, free_ts 499784760669 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4585 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5926 __folio_alloc+0x12/0x40 mm/page_alloc.c:5959 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] filemap_alloc_folio include/linux/pagemap.h:515 [inline] page_cache_ra_unbounded+0x256/0x850 mm/readahead.c:260 do_page_cache_ra mm/readahead.c:313 [inline] page_cache_ra_order+0x3ab/0xf00 mm/readahead.c:584 ondemand_readahead+0x82a/0xdc0 mm/readahead.c:712 page_cache_async_ra+0xf2/0x120 mm/readahead.c:761 do_async_mmap_readahead mm/filemap.c:3234 [inline] filemap_fault+0x826/0x1360 mm/filemap.c:3288 __do_fault mm/memory.c:4376 [inline] do_read_fault mm/memory.c:4751 [inline] do_fault+0x1b52/0x1ee0 mm/memory.c:4887 handle_pte_fault mm/memory.c:5183 [inline] __handle_mm_fault mm/memory.c:5325 [inline] handle_mm_fault+0x133a/0x26c0 mm/memory.c:5465 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x34b/0xdb0 mm/gup.c:1250 populate_vma_page_range mm/gup.c:1607 [inline] __mm_populate+0x2ea/0x430 mm/gup.c:1721 mm_populate include/linux/mm.h:3148 [inline] vm_mmap_pgoff+0x293/0x410 mm/util.c:530 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1537 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1580 [inline] free_pcp_prepare mm/page_alloc.c:1654 [inline] free_unref_page_prepare+0x7f8/0x800 mm/page_alloc.c:3620 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3771 release_pages+0xc93/0xcf0 mm/swap.c:1048 __pagevec_release+0x71/0xe0 mm/swap.c:1068 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] truncate_inode_pages_range+0x365/0xd70 mm/truncate.c:402 truncate_inode_pages+0x24/0x30 mm/truncate.c:484 kill_bdev block/bdev.c:77 [inline] blkdev_flush_mapping+0x158/0x2c0 block/bdev.c:686 blkdev_put_whole block/bdev.c:717 [inline] blkdev_put+0x478/0x710 block/bdev.c:977 kill_block_super+0xb8/0xf0 fs/super.c:1478 kill_f2fs_super+0x309/0x3c0 fs/f2fs/super.c:4893 deactivate_locked_super+0xb5/0x120 fs/super.c:336 deactivate_super+0xaf/0xe0 fs/super.c:367 cleanup_mnt+0x474/0x500 fs/namespace.c:1192 __cleanup_mnt+0x19/0x20 fs/namespace.c:1199 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 Memory state around the buggy address: ffff8881183bad80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881183bae00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881183bae80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881183baf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881183baf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop4): ext4_read_block_bitmap_nowait:477: comm syz.4.4203: Invalid block bitmap block 1600 in block_group 0 EXT4-fs error (device loop4) in ext4_reserve_inode_write:5935: Corrupt filesystem EXT4-fs error (device loop4): ext4_dirty_inode:6139: inode #15: comm syz.4.4203: mark_inode_dirty error EXT4-fs error (device loop4) in ext4_reserve_inode_write:5935: Corrupt filesystem EXT4-fs error (device loop4): ext4_ext_truncate:4460: inode #15: comm syz.4.4203: mark_inode_dirty error EXT4-fs error (device loop4) in ext4_reserve_inode_write:5935: Corrupt filesystem EXT4-fs error (device loop4): ext4_truncate:4320: inode #15: comm syz.4.4203: mark_inode_dirty error