==================================================================
BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline]
BUG: KASAN: use-after-free in ext4_inlinedir_to_tree+0x508/0xfe0 fs/ext4/inline.c:1433
Read of size 68 at addr ffff88816ea017a3 by task syz.7.13405/16657

CPU: 1 PID: 16657 Comm: syz.7.13405 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memcpy+0x2d/0x70 mm/kasan/shadow.c:65
 ext4_read_inline_data fs/ext4/inline.c:210 [inline]
 ext4_inlinedir_to_tree+0x508/0xfe0 fs/ext4/inline.c:1433
 ext4_htree_fill_tree+0x508/0x1160 fs/ext4/namei.c:1211
 ext4_dx_readdir fs/ext4/dir.c:609 [inline]
 ext4_readdir+0x2cdb/0x3b20 fs/ext4/dir.c:145
 iterate_dir+0x260/0x600 fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0xf2/0x250 fs/readdir.c:354
 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354
 x64_sys_call+0x592/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f43c9264eb9
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:00007f43c7ca0028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f43c94e0090 RCX: 00007f43c9264eb9
RDX: 00000000000000b3 RSI: 0000200000000200 RDI: 0000000000000006
RBP: 00007f43c92d2c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f43c94e0128 R14: 00007f43c94e0090 R15: 00007fffcd917888
 </TASK>

The buggy address belongs to the page:
page:ffffea0005ba8040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16ea01
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 0000000000000000 ffffffff05ba0902 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 9, migratetype Movable, gfp_mask 0x1c24ca(GFP_TRANSHUGE), pid 35, ts 2780255727674, free_ts 2780255849597
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5808
 __alloc_pages_node include/linux/gfp.h:595 [inline]
 alloc_pages_node include/linux/gfp.h:609 [inline]
 alloc_pages include/linux/gfp.h:622 [inline]
 alloc_khugepaged_hugepage mm/khugepaged.c:909 [inline]
 khugepaged_alloc_hugepage mm/khugepaged.c:921 [inline]
 khugepaged_prealloc_page mm/khugepaged.c:951 [inline]
 khugepaged_do_scan mm/khugepaged.c:2279 [inline]
 khugepaged+0x339/0xf70 mm/khugepaged.c:2337
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 __free_pages_ok+0x925/0x9f0 mm/page_alloc.c:1772
 free_the_page mm/page_alloc.c:807 [inline]
 free_compound_page+0x89/0xa0 mm/page_alloc.c:828
 free_transhuge_page+0x250/0x270 mm/huge_memory.c:2775
 destroy_compound_page include/linux/mm.h:1000 [inline]
 __put_compound_page+0x77/0xb0 mm/swap.c:111
 __put_page+0xbc/0xe0 mm/swap.c:127
 put_page include/linux/mm.h:1306 [inline]
 khugepaged_do_scan mm/khugepaged.c:2300 [inline]
 khugepaged+0x84a/0xf70 mm/khugepaged.c:2337
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Memory state around the buggy address:
 ffff88816ea01680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816ea01700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88816ea01780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88816ea01800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816ea01880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs error (device loop7): ext4_inlinedir_to_tree:1471: inode #12: block 5: comm syz.7.13405: path /37/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=65443, inode=3768055910, rec_len=65439, size=128 fake=0
EXT4-fs error (device loop7): ext4_do_update_inode:5248: inode #12: comm syz.7.13405: corrupted inode contents
EXT4-fs error (device loop7): ext4_dirty_inode:6084: inode #12: comm syz.7.13405: mark_inode_dirty error