==================================================================
BUG: KASAN: use-after-free in ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1543
Read of size 1 at addr ffff88806bcc4d23 by task syz-executor342/5059

CPU: 1 PID: 5059 Comm: syz-executor342 Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x142/0x170 mm/kasan/report.c:588
 ext4_search_dir+0xf2/0x1b0 fs/ext4/namei.c:1543
 ext4_find_inline_entry+0x4ba/0x5e0 fs/ext4/inline.c:1694
 __ext4_find_entry+0x2b4/0x1b30 fs/ext4/namei.c:1616
 ext4_lookup_entry fs/ext4/namei.c:1771 [inline]
 ext4_lookup+0x17a/0x750 fs/ext4/namei.c:1839
 lookup_one_qstr_excl+0x11b/0x250 fs/namei.c:1609
 filename_create+0x297/0x530 fs/namei.c:3876
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4121
 __do_sys_mkdirat fs/namei.c:4144 [inline]
 __se_sys_mkdirat fs/namei.c:4142 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4142
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f8c74d293a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 1f 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffec3db0d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f8c74d6d1d7 RCX: 00007f8c74d293a9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 00000000ffffff9c
RBP: 0030656c69662f2e R08: 00000000000014ef R09: 0000000020001580
R10: 00000000000014f3 R11: 0000000000000246 R12: 0000000000000031
R13: 0000000000000003 R14: 00007f8c74da06c0 R15: 00007ffec3db0dfa
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001af3100 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6bcc4
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 14724262823, free_ts 16180710530
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537
 split_map_pages+0x24a/0x510 mm/compaction.c:97
 isolate_freepages_range+0x476/0x4d0 mm/compaction.c:774
 alloc_contig_range+0x62e/0x9a0 mm/page_alloc.c:6411
 __alloc_contig_pages mm/page_alloc.c:6434 [inline]
 alloc_contig_pages+0x3f4/0x4f0 mm/page_alloc.c:6514
 debug_vm_pgtable_alloc_huge_page+0xb9/0x110 mm/debug_vm_pgtable.c:1095
 init_args+0x837/0xb10 mm/debug_vm_pgtable.c:1277
 debug_vm_pgtable+0xe0/0x540 mm/debug_vm_pgtable.c:1315
 do_one_initcall+0x234/0x810 init/main.c:1236
 do_initcall_level+0x157/0x210 init/main.c:1298
 do_initcalls+0x3f/0x80 init/main.c:1314
 kernel_init_freeable+0x429/0x5c0 init/main.c:1551
 kernel_init+0x1d/0x2a0 init/main.c:1441
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
 free_contig_range+0x9e/0x160 mm/page_alloc.c:6536
 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x4ba/0x540 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x234/0x810 init/main.c:1236
 do_initcall_level+0x157/0x210 init/main.c:1298
 do_initcalls+0x3f/0x80 init/main.c:1314
 kernel_init_freeable+0x429/0x5c0 init/main.c:1551
 kernel_init+0x1d/0x2a0 init/main.c:1441
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffff88806bcc4c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806bcc4c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806bcc4d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88806bcc4d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806bcc4e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================