ext4 filesystem being mounted at /root/syzkaller-testdir1563164225/syzkaller.VYaSuq/80/file0 supports timestamps until 2038 (0x7fffffff)
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BUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x42e/0x4a0 fs/ext4/namei.c:3704
Read of size 4 at addr ffff888165b8c000 by task syz-executor.4/30605

CPU: 1 PID: 30605 Comm: syz-executor.4 Tainted: G        W         5.10.161-syzkaller-00019-g416c4356f372 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3c0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_rename_dir_prepare+0x42e/0x4a0 fs/ext4/namei.c:3704
 ext4_rename fs/ext4/namei.c:3999 [inline]
 ext4_rename2+0x266a/0x45a0 fs/ext4/namei.c:4300
 vfs_rename+0x95e/0xde0 fs/namei.c:4389
 do_renameat2+0x83e/0x1190 fs/namei.c:4536
 __do_sys_renameat2 fs/namei.c:4571 [inline]
 __se_sys_renameat2 fs/namei.c:4568 [inline]
 __x64_sys_renameat2+0xbf/0xd0 fs/namei.c:4568
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f680eefd169
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:00007f680dc70168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f680f01cf80 RCX: 00007f680eefd169
RDX: 0000000000000005 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f680ef58ca1 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000020000280 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe907e416f R14: 00007f680dc70300 R15: 0000000000022000

The buggy address belongs to the page:
page:ffffea000596e300 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x165b8c
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea000596e348 ffff8881f715acc0 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 0x1100cca(GFP_HIGHUSER_MOVABLE), pid 30483, ts 1350804538973, free_ts 1351109975570
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2386 [inline]
 prep_new_page mm/page_alloc.c:2392 [inline]
 get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073
 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160
 __alloc_pages include/linux/gfp.h:529 [inline]
 __alloc_pages_node include/linux/gfp.h:542 [inline]
 alloc_pages_node include/linux/gfp.h:556 [inline]
 alloc_pages include/linux/gfp.h:575 [inline]
 shmem_alloc_page mm/shmem.c:1582 [inline]
 shmem_alloc_and_acct_page+0x899/0xbf0 mm/shmem.c:1607
 shmem_getpage_gfp+0x8d4/0x25e0 mm/shmem.c:1920
 shmem_getpage mm/shmem.c:162 [inline]
 shmem_write_begin+0xc8/0x1b0 mm/shmem.c:2502
 generic_perform_write+0x309/0x5b0 mm/filemap.c:3468
 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3597
 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3629
 call_write_iter include/linux/fs.h:1969 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xc4a/0xf80 fs/read_write.c:605
 ksys_write+0x198/0x2c0 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1332 [inline]
 free_pcp_prepare+0x18c/0x1c0 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3293 [inline]
 free_unref_page_list+0x11d/0x660 mm/page_alloc.c:3367
 release_pages+0xc24/0xc60 mm/swap.c:1082
 __pagevec_release+0x81/0xf0 mm/swap.c:1102
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x7ac/0x18d0 mm/shmem.c:966
 shmem_truncate_range mm/shmem.c:1070 [inline]
 shmem_evict_inode+0x228/0xa20 mm/shmem.c:1170
 evict+0x2a3/0x6c0 fs/inode.c:577
 iput_final fs/inode.c:1655 [inline]
 iput+0x61f/0x7d0 fs/inode.c:1681
 dentry_unlink_inode+0x2df/0x3d0 fs/dcache.c:374
 __dentry_kill+0x3e2/0x5d0 fs/dcache.c:579
 dentry_kill+0xc0/0x2a0 fs/dcache.c:692
 dput+0x175/0x320 fs/dcache.c:878
 __fput+0x540/0x7c0 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x147/0x1b0 kernel/task_work.c:154
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xc8/0xe0 kernel/entry/common.c:164

Memory state around the buggy address:
 ffff888165b8bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888165b8bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888165b8c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888165b8c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888165b8c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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