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: Ignoring removed oldalloc option
EXT4-fs: Ignoring removed orlov option
EXT4-fs (loop0): stripe (2) is not aligned with cluster size (16), stripe is disabled
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
==================================================================
BUG: KASAN: use-after-free in ext4_ext_split fs/ext4/extents.c:1161 [inline]
BUG: KASAN: use-after-free in ext4_ext_create_new_leaf fs/ext4/extents.c:1424 [inline]
BUG: KASAN: use-after-free in ext4_ext_insert_extent+0x26a2/0x4af0 fs/ext4/extents.c:2117
Write of size 9804 at addr ffff888055ae940c by task syz.0.0/5344

CPU: 0 UID: 0 PID: 5344 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+0xe8/0x150 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+0x40/0x70 mm/kasan/shadow.c:95
 ext4_ext_split fs/ext4/extents.c:1161 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1424 [inline]
 ext4_ext_insert_extent+0x26a2/0x4af0 fs/ext4/extents.c:2117
 ext4_ext_map_blocks+0x19ef/0x69c0 fs/ext4/extents.c:4404
 ext4_map_create_blocks fs/ext4/inode.c:613 [inline]
 ext4_map_blocks+0x82c/0x16f0 fs/ext4/inode.c:816
 _ext4_get_block+0x1fa/0x4c0 fs/ext4/inode.c:916
 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:949
 ext4_block_write_begin+0xb03/0x1940 fs/ext4/inode.c:1203
 ext4_write_begin+0xb3a/0x1860 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x352/0xd30 fs/ext4/inode.c:3130
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314
 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:299
 ext4_file_write_iter+0x292/0x1bc0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcadc38f7c9
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:00007fcadd164038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcadc5e5fa0 RCX: 00007fcadc38f7c9
RDX: 00000000fffffdef RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007fcadc413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcadc5e6038 R14: 00007fcadc5e5fa0 R15: 00007ffe2e3db2b8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:3 mapcount:0 mapping:ffff888031d4cd80 index:0x44 pfn:0x55ae9
memcg:ffff888030498d40
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff08000004004(referenced|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff08000004004 0000000000000000 dead000000000122 ffff888031d4cd80
raw: 0000000000000044 ffff8880475ea740 00000003ffffffff ffff888030498d40
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x40c48(GFP_NOFS|__GFP_MOVABLE|__GFP_COMP), pid 5344, tgid 5343 (syz.0.0), ts 86253410014, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857
 prep_new_page mm/page_alloc.c:1865 [inline]
 get_page_from_freelist+0x24e0/0x2580 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+0x107/0x470 mm/filemap.c:1013
 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2006
 __filemap_get_folio include/linux/pagemap.h:763 [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+0x1f7/0x6e0 fs/buffer.c:1461
 sb_getblk_gfp include/linux/buffer_head.h:392 [inline]
 ext4_ext_split fs/ext4/extents.c:1127 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1424 [inline]
 ext4_ext_insert_extent+0x2355/0x4af0 fs/ext4/extents.c:2117
 ext4_ext_map_blocks+0x19ef/0x69c0 fs/ext4/extents.c:4404
 ext4_map_create_blocks fs/ext4/inode.c:613 [inline]
 ext4_map_blocks+0x82c/0x16f0 fs/ext4/inode.c:816
 _ext4_get_block+0x1fa/0x4c0 fs/ext4/inode.c:916
 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:949
 ext4_block_write_begin+0xb03/0x1940 fs/ext4/inode.c:1203
 ext4_write_begin+0xb3a/0x1860 fs/ext4/ext4_jbd2.h:-1
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888055ae9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888055ae9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888055aea000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888055aea080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888055aea100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================