loop0: detected capacity change from 0 to 2048
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
loop0: detected capacity change from 2048 to 2047
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1751
Read of size 18446744073709551600 at addr ffff888043eceeb8 by task syz.0.0/5362

CPU: 0 UID: 0 PID: 5362 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1751
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2263
 ext4_destroy_inline_data_nolock+0x214/0x5b0 fs/ext4/inline.c:463
 ext4_convert_inline_data_nolock+0x1f1/0x970 fs/ext4/inline.c:1105
 ext4_convert_inline_data+0x4b3/0x5e0 fs/ext4/inline.c:1976
 ext4_fallocate+0x1e2/0x3d0 fs/ext4/extents.c:4793
 vfs_fallocate+0x669/0x7e0 fs/open.c:342
 ksys_fallocate fs/open.c:366 [inline]
 __do_sys_fallocate fs/open.c:371 [inline]
 __se_sys_fallocate fs/open.c:369 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:369
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4572b8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f45739f0038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f4572de5fa0 RCX: 00007f4572b8eec9
RDX: 0000000000000007 RSI: 0000000000000010 RDI: 000000000000000a
RBP: 00007f4572c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4572de6038 R14: 00007f4572de5fa0 R15: 00007ffdafe8b418
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:ffff88803202cd80 index:0x2 pfn:0x43ece
memcg:ffff888030488d00
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff38000004224(referenced|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff38000004224 ffffea000134e008 ffffea000108c288 ffff88803202cd80
raw: 0000000000000002 ffff8880437e5570 00000002ffffffff ffff888030488d00
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x42800(GFP_NOWAIT|__GFP_COMP), pid 5362, tgid 5361 (syz.0.0), ts 85853314150, free_ts 85823572469
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2517
 filemap_alloc_folio_noprof+0xdf/0x470 mm/filemap.c:1007
 __filemap_get_folio+0x3f2/0xaf0 mm/filemap.c:1981
 grow_dev_folio fs/buffer.c:1050 [inline]
 grow_buffers fs/buffer.c:1116 [inline]
 __getblk_slow fs/buffer.c:1134 [inline]
 bdev_getblk+0x1ad/0x660 fs/buffer.c:1461
 ext4_sb_breadahead_unmovable+0x6f/0xf0 fs/ext4/super.c:270
 __ext4_get_inode_loc+0xcc9/0x1040 fs/ext4/inode.c:4949
 ext4_get_inode_loc fs/ext4/inode.c:4994 [inline]
 ext4_reserve_inode_write+0x18b/0x360 fs/ext4/inode.c:6323
 __ext4_mark_inode_dirty+0x15b/0x700 fs/ext4/inode.c:6501
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6538
 __mark_inode_dirty+0x2ec/0xe10 fs/fs-writeback.c:2527
 generic_update_time fs/inode.c:2063 [inline]
 inode_update_time fs/inode.c:2076 [inline]
 __file_update_time fs/inode.c:2304 [inline]
 file_modified_flags+0x4b0/0x560 fs/inode.c:2375
page last free pid 5362 tgid 5361 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xdbd/0x1520 mm/page_alloc.c:2952
 folios_put_refs+0x559/0x640 mm/swap.c:999
 folio_batch_release include/linux/pagevec.h:101 [inline]
 mapping_try_invalidate+0x324/0x410 mm/truncate.c:554
 loop_set_status+0x26e/0xd60 drivers/block/loop.c:1244
 lo_ioctl+0x9f6/0x1c10 drivers/block/loop.c:-1
 blkdev_ioctl+0x5a8/0x6d0 block/ioctl.c:705
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888043eced80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888043ecee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888043ecee80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff888043ecef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888043ecef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================