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.
vim2m vim2m.0: Fourcc format (0x31384142) invalid.
loop0: detected capacity change from 2048 to 1791
EXT4-fs error (device loop0): __ext4_new_inode:1073: comm syz.0.0: reserved inode found cleared - inode=1
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1760
Read of size 18446744073709551600 at addr ffff8880446231b8 by task syz.0.0/5343

CPU: 0 UID: 0 PID: 5343 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:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1760
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2272
 ext4_destroy_inline_data_nolock+0x214/0x5c0 fs/ext4/inline.c:472
 ext4_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1798
 ext4_do_writepages+0x4e6/0x4500 fs/ext4/inode.c:2811
 ext4_writepages+0x203/0x350 fs/ext4/inode.c:3026
 do_writepages+0x32e/0x550 mm/page-writeback.c:2598
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_fdatawrite_range mm/filemap.c:412 [inline]
 file_write_and_wait_range+0x23e/0x340 mm/filemap.c:786
 generic_buffers_fsync_noflush+0x70/0x1d0 fs/buffer.c:609
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x322/0xae0 fs/ext4/fsync.c:147
 generic_write_sync include/linux/fs.h:2616 [inline]
 ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:305
 ext4_file_write_iter+0x292/0x1bc0 fs/ext4/file.c:-1
 aio_write+0x535/0x7a0 fs/aio.c:1634
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x775/0x1430 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit+0x185/0x320 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b5458f7c9
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:00007f3b5538a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f3b547e5fa0 RCX: 00007f3b5458f7c9
RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f3b55340000
RBP: 00007f3b54613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b547e6038 R14: 00007f3b547e5fa0 R15: 00007ffc2ef6ead8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:ffff888032154d80 index:0x3 pfn:0x44623
memcg:ffff888030410d40
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff5800000423c(referenced|uptodate|dirty|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff5800000423c ffff888030498a80 ffff888030498a80 ffff888032154d80
raw: 0000000000000003 ffff88801a211cb0 00000002ffffffff ffff888030410d40
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x140cc0(GFP_USER|__GFP_COMP), pid 5343, tgid 5342 (syz.0.0), ts 86562565971, free_ts 86502792056
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2577
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2587
 filemap_alloc_folio_noprof+0x112/0x490 mm/filemap.c:1013
 do_read_cache_folio+0x2e2/0x590 mm/filemap.c:4059
 read_mapping_folio include/linux/pagemap.h:1017 [inline]
 read_part_sector+0xb6/0x2b0 block/partitions/core.c:722
 ultrix_partition+0xab/0x8b0 block/partitions/ultrix.c:29
 check_partition block/partitions/core.c:141 [inline]
 blk_add_partitions block/partitions/core.c:589 [inline]
 bdev_disk_changed+0x75f/0x14b0 block/partitions/core.c:693
 loop_reread_partitions drivers/block/loop.c:448 [inline]
 loop_set_status+0x918/0xd60 drivers/block/loop.c:1277
 lo_ioctl+0x9ef/0x1c50 drivers/block/loop.c:-1
 blkdev_ioctl+0x60e/0x710 block/ioctl.c:791
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
page last free pid 5343 tgid 5342 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:3000
 folios_put_refs+0x584/0x670 mm/swap.c:1002
 folio_batch_release include/linux/pagevec.h:101 [inline]
 mapping_try_invalidate+0x324/0x410 mm/truncate.c:579
 loop_set_status+0x26e/0xd60 drivers/block/loop.c:1247
 lo_ioctl+0x9ef/0x1c50 drivers/block/loop.c:-1
 blkdev_ioctl+0x60e/0x710 block/ioctl.c:791
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888044623080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888044623100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888044623180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff888044623200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888044623280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================