================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881110a0ab8 by task syz.3.1081/4246 CPU: 1 PID: 4246 Comm: syz.3.1081 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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_convert_inline_data_to_extent fs/ext4/inline.c:633 [inline] ext4_try_to_write_inline_data+0x6f4/0x11a0 fs/ext4/inline.c:774 ext4_write_begin+0x26a/0x1360 fs/ext4/inode.c:1194 ext4_da_write_begin+0x361/0xbd0 fs/ext4/inode.c:2990 generic_perform_write+0x2b7/0x690 mm/filemap.c:3887 ext4_buffered_write_iter+0x4ab/0x630 fs/ext4/file.c:270 ext4_file_write_iter+0x427/0x1530 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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 RIP: 0033:0x7fcec84cbe59 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:00007fcec6f25028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fcec8753fa0 RCX: 00007fcec84cbe59 RDX: 00000000fffffdab RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007fcec8561e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcec8754038 R14: 00007fcec8753fa0 R15: 00007fff069eae68 The buggy address belongs to the page: page:ffffea0004442800 refcount:8 mapcount:1 mapping:ffff8881092cb458 index:0x2c pfn:0x1110a0 memcg:ffff88810d6b6780 aops:def_blk_aops ino:700003 flags: 0x400000000002201e(referenced|uptodate|dirty|lru|private|mappedtodisk|zone=1) raw: 400000000002201e ffffea0004442848 ffffea0004ce37c8 ffff8881092cb458 raw: 000000000000002c ffff88812911ae70 0000000800000000 ffff88810d6b6780 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 4246, ts 157511773109, free_ts 157510966335 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] page_cache_ra_unbounded+0x2bc/0x960 mm/readahead.c:227 do_page_cache_ra mm/readahead.c:280 [inline] ondemand_readahead+0x8b7/0xeb0 mm/readahead.c:565 page_cache_async_ra+0x306/0x440 mm/readahead.c:628 page_cache_async_readahead include/linux/pagemap.h:854 [inline] do_async_mmap_readahead mm/filemap.c:3059 [inline] filemap_fault+0xcc3/0x1cc0 mm/filemap.c:3164 __do_fault+0x25f/0x2f0 mm/memory.c:4195 do_read_fault mm/memory.c:4568 [inline] do_fault mm/memory.c:4709 [inline] handle_pte_fault+0x1bc0/0x2770 mm/memory.c:4923 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1b3b/0x1e30 mm/memory.c:5345 handle_mm_fault include/linux/mm.h:1847 [inline] faultin_page mm/gup.c:976 [inline] __get_user_pages+0x80e/0x10c0 mm/gup.c:1197 populate_vma_page_range mm/gup.c:1529 [inline] __mm_populate+0x324/0x470 mm/gup.c:1638 mm_populate include/linux/mm.h:2704 [inline] vm_mmap_pgoff+0x245/0x410 mm/util.c:560 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1647 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 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+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 getname_flags+0xba/0x510 fs/namei.c:138 user_path_at_empty+0x2f/0x1c0 fs/namei.c:2890 Memory state around the buggy address: ffff8881110a0980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881110a0a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881110a0a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881110a0b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881110a0b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop3): ext4_free_inode:355: comm syz.3.1081: bit already cleared for inode 15