loop0: detected capacity change from 0 to 1024
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x179e/0x1e20 fs/ext4/xattr.c:1740
Read of size 12404 at addr ffff888012eb4800 by task syz.0.0/5323

CPU: 0 UID: 0 PID: 5323 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 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x179e/0x1e20 fs/ext4/xattr.c:1740
 ext4_xattr_block_set+0x621/0x2ad0 fs/ext4/xattr.c:1961
 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457
 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x16a/0x2e0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x281/0x630 fs/xattr.c:665
 path_setxattrat+0x3f3/0x430 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a9e39aeb9
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:00007f5a9f259028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f5a9e615fa0 RCX: 00007f5a9e39aeb9
RDX: 0000200000000000 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007f5a9e408c1f R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a9e616038 R14: 00007f5a9e615fa0 R15: 00007ffe9e5f4f78
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:ffff88803207cd80 index:0x1c pfn:0x12eb4
memcg:ffff888030410d40
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0xfff58000004234(referenced|dirty|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff58000004234 ffffea0000724788 ffffea00007238c8 ffff88803207cd80
raw: 000000000000001c ffff88801280a9f8 00000002ffffffff ffff888030410d40
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5323, tgid 5322 (syz.0.0), ts 75413302853, free_ts 75299309963
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
 prep_new_page mm/page_alloc.c:1892 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3945
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0xa8/0x190 mm/mempolicy.c:2577
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2587
 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013
 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2006
 __filemap_get_folio include/linux/pagemap.h:774 [inline]
 grow_dev_folio fs/buffer.c:1050 [inline]
 grow_buffers fs/buffer.c:1116 [inline]
 __getblk_slow fs/buffer.c:1134 [inline]
 bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1461
 __getblk include/linux/buffer_head.h:380 [inline]
 sb_getblk include/linux/buffer_head.h:386 [inline]
 ext4_xattr_block_set+0x1d71/0x2ad0 fs/ext4/xattr.c:2131
 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457
 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x16a/0x2e0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x281/0x630 fs/xattr.c:665
page last free pid 78 tgid 78 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1433 [inline]
 free_unref_folios+0xdce/0x1510 mm/page_alloc.c:3030
 shrink_folio_list+0x4930/0x5160 mm/vmscan.c:1603
 evict_folios+0x4795/0x5880 mm/vmscan.c:4711
 try_to_shrink_lruvec+0x88b/0xb20 mm/vmscan.c:4874
 shrink_one+0x25c/0x710 mm/vmscan.c:4919
 shrink_many mm/vmscan.c:4982 [inline]
 lru_gen_shrink_node mm/vmscan.c:5060 [inline]
 shrink_node+0x2f8b/0x35f0 mm/vmscan.c:6047
 kswapd_shrink_node mm/vmscan.c:6901 [inline]
 balance_pgdat mm/vmscan.c:7084 [inline]
 kswapd+0x144c/0x2800 mm/vmscan.c:7354
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Memory state around the buggy address:
 ffff888012eb6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888012eb6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888012eb7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888012eb7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888012eb7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================