EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem
EXT4-fs (loop0): 1 truncate cleaned up
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KASAN: use-after-free in ext4_search_dir+0xee/0x1b0 fs/ext4/namei.c:1539
Read of size 1 at addr ffff88806741c3ed by task syz-executor.0/5456

CPU: 1 PID: 5456 Comm: syz-executor.0 Not tainted 6.4.0-rc7-syzkaller-g45a3e24f65e9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:351 [inline]
 print_report+0x15f/0x540 mm/kasan/report.c:462
 kasan_report+0x172/0x1a0 mm/kasan/report.c:572
 ext4_search_dir+0xee/0x1b0 fs/ext4/namei.c:1539
 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1719
 __ext4_find_entry+0x2b0/0x1b20 fs/ext4/namei.c:1612
 ext4_lookup_entry fs/ext4/namei.c:1767 [inline]
 ext4_lookup+0x176/0x740 fs/ext4/namei.c:1835
 lookup_open fs/namei.c:3470 [inline]
 open_last_lookups fs/namei.c:3560 [inline]
 path_openat+0x11e5/0x3170 fs/namei.c:3788
 do_filp_open+0x230/0x480 fs/namei.c:3818
 do_sys_openat2+0x13b/0x500 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_open fs/open.c:1380 [inline]
 __se_sys_open fs/open.c:1376 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1376
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc337a8c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007fc338718168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fc337babf80 RCX: 00007fc337a8c389
RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100
RBP: 00007fc337ad7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe5ce485df R14: 00007fc338718300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00019d0700 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6741c
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea00019d0248 ffffea00019d06c8 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5365, tgid 5365 (sed), ts 82507377788, free_ts 82513631475
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1d2/0x1f0 mm/page_alloc.c:1731
 prep_new_page mm/page_alloc.c:1738 [inline]
 get_page_from_freelist+0x31f8/0x3370 mm/page_alloc.c:3502
 __alloc_pages+0x251/0x660 mm/page_alloc.c:4768
 __folio_alloc+0xf/0x30 mm/page_alloc.c:4800
 vma_alloc_folio+0x486/0x990 mm/mempolicy.c:2240
 wp_page_copy mm/memory.c:3074 [inline]
 do_wp_page+0xb31/0x3640 mm/memory.c:3432
 handle_pte_fault mm/memory.c:4964 [inline]
 __handle_mm_fault mm/memory.c:5089 [inline]
 handle_mm_fault+0x24c6/0x59e0 mm/memory.c:5243
 do_user_addr_fault arch/x86/mm/fault.c:1440 [inline]
 handle_page_fault arch/x86/mm/fault.c:1534 [inline]
 exc_page_fault+0x78a/0x8c0 arch/x86/mm/fault.c:1590
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1302 [inline]
 free_unref_page_prepare+0x8ee/0xa10 mm/page_alloc.c:2564
 free_unref_page_list+0x58e/0x830 mm/page_alloc.c:2705
 release_pages+0x275c/0x2a70 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu+0xfc/0x210 mm/mmu_gather.c:299
 tlb_finish_mmu+0xd0/0x1f0 mm/mmu_gather.c:391
 exit_mmap+0x3d6/0xac0 mm/mmap.c:3120
 __mmput+0x115/0x3c0 kernel/fork.c:1351
 exit_mm+0x223/0x300 kernel/exit.c:567
 do_exit+0x60e/0x2280 kernel/exit.c:861
 do_group_exit+0x202/0x2b0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88806741c280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806741c300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806741c380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff88806741c400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806741c480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================