EXT4-fs (loop4): mounted filesystem without journal. Opts: max_batch_time=0x0000000000000004,max_batch_time=0x0000000000000002,debug_want_extra_isize=0x000000000000006a,mb_optimize_scan=0x0000000000000001,errors=remount-ro,nombcache,. Quota mode: none.
EXT4-fs error (device loop4): ext4_update_inline_data:358: inode #15: comm syz.4.873: missing inline data xattr
EXT4-fs (loop4): Remounting filesystem read-only
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1738
Read of size 18446744073709551600 at addr ffff88812261aeb8 by task syz.4.873/3745

CPU: 1 PID: 3745 Comm: syz.4.873 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __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_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
 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_pwrite64 fs/read_write.c:701 [inline]
 __do_sys_pwrite64 fs/read_write.c:711 [inline]
 __se_sys_pwrite64 fs/read_write.c:708 [inline]
 __x64_sys_pwrite64+0x194/0x220 fs/read_write.c:708
 x64_sys_call+0xa6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19
 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: 0033:0x7f46a7c5ee59
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:00007f46a6697028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f46a7ee7090 RCX: 00007f46a7c5ee59
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 000000000000000a
RBP: 00007f46a7cf4e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000c00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46a7ee7128 R14: 00007f46a7ee7090 R15: 00007ffe92785ca8
 </TASK>

The buggy address belongs to the page:
page:ffffea0004898680 refcount:3 mapcount:1 mapping:ffff8881092fea98 index:0x4 pfn:0x12261a
memcg:ffff8881002533c0
aops:def_blk_aops ino:700004
flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1)
raw: 400000000002203e ffffea0005099f48 ffffea00048e40c8 ffff8881092fea98
raw: 0000000000000004 ffff8881129aae70 0000000300000000 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 1785, ts 147437993961, free_ts 147080610245
 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]
 force_page_cache_ra+0x406/0x460 mm/readahead.c:312
 page_cache_sync_ra+0x30f/0x5a0 mm/readahead.c:592
 page_cache_sync_readahead include/linux/pagemap.h:831 [inline]
 filemap_get_pages mm/filemap.c:2571 [inline]
 filemap_read+0x68b/0x21e0 mm/filemap.c:2656
 generic_file_read_iter+0xac/0x420 mm/filemap.c:2816
 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: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
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x17e/0x310 mm/mmu_gather.c:338
 exit_mmap+0x43b/0x8b0 mm/mmap.c:3248
 __mmput+0x92/0x300 kernel/fork.c:1185
 mmput+0x50/0x150 kernel/fork.c:1208
 exit_mm kernel/exit.c:555 [inline]
 do_exit+0xacc/0x29a0 kernel/exit.c:877
 do_group_exit+0x149/0x310 kernel/exit.c:1004
 __do_sys_exit_group kernel/exit.c:1015 [inline]
 __se_sys_exit_group kernel/exit.c:1013 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1013
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 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

Memory state around the buggy address:
 ffff88812261ad80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812261ae00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812261ae80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff88812261af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812261af80: 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:476: comm syz.4.873: Invalid block bitmap block 0 in block_group 0
EXT4-fs (loop4): Remounting filesystem read-only