==================================================================
BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xc67/0xc80 fs/ext4/xattr.c:2894
Read of size 4 at addr ffff88812a146000 by task syz-executor.4/1375

CPU: 0 PID: 1375 Comm: syz-executor.4 Not tainted 5.10.214-syzkaller-00187-ge6f44899ce5d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_delete_inode+0xc67/0xc80 fs/ext4/xattr.c:2894
 ext4_evict_inode+0x1095/0x1730 fs/ext4/inode.c:300
 evict+0x2a3/0x6c0 fs/inode.c:577
 iput_final fs/inode.c:1697 [inline]
 iput+0x632/0x7e0 fs/inode.c:1723
 d_delete_notify include/linux/fsnotify.h:261 [inline]
 vfs_rmdir+0x271/0x3f0 fs/namei.c:3865
 do_rmdir+0x2cf/0x5c0 fs/namei.c:3912
 __do_sys_unlinkat fs/namei.c:4076 [inline]
 __se_sys_unlinkat fs/namei.c:4070 [inline]
 __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4070
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f5d188db687
Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd84ee2d8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f5d188db687
RDX: 0000000000000200 RSI: 00007fffd84ef480 RDI: 00000000ffffff9c
RBP: 00007f5d18938636 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007fffd84ef480
R13: 00007f5d18938636 R14: 000000000000b6b1 R15: 0000000000000007

The buggy address belongs to the page:
page:ffffea0004a85180 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x12a146
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea0004a8b308 ffffea0004a56d08 0000000000000000
raw: 0000000000000001 0000000000000001 00000000ffffff7f 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 1415, ts 45811695810, free_ts 46655406871
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5346
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 shmem_alloc_page+0x257/0x420 mm/shmem.c:1580
 shmem_alloc_and_acct_page+0x395/0x8e0 mm/shmem.c:1605
 shmem_getpage_gfp+0x891/0x2480 mm/shmem.c:1918
 shmem_fault+0x2d4/0x7b0 mm/shmem.c:2139
 __do_fault mm/memory.c:4036 [inline]
 do_read_fault mm/memory.c:4371 [inline]
 do_fault mm/memory.c:4499 [inline]
 handle_pte_fault+0x23a9/0x3e30 mm/memory.c:4763
 __handle_mm_fault mm/memory.c:4916 [inline]
 handle_mm_fault+0x11d6/0x1a10 mm/memory.c:5330
 faultin_page mm/gup.c:902 [inline]
 __get_user_pages+0xb31/0x11b0 mm/gup.c:1121
 populate_vma_page_range mm/gup.c:1454 [inline]
 __mm_populate+0x363/0x520 mm/gup.c:1502
 mm_populate include/linux/mm.h:2768 [inline]
 vm_mmap_pgoff+0x264/0x390 mm/util.c:548
 ksys_mmap_pgoff+0xf8/0x1f0 mm/mmap.c:1701
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_64+0x34/0x70
 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:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443
 release_pages+0xea0/0xef0 mm/swap.c:1103
 __pagevec_release+0x84/0x100 mm/swap.c:1123
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x7d1/0x1a60 mm/shmem.c:965
 shmem_truncate_range mm/shmem.c:1069 [inline]
 shmem_evict_inode+0x215/0x9d0 mm/shmem.c:1169
 evict+0x2a3/0x6c0 fs/inode.c:577
 iput_final fs/inode.c:1697 [inline]
 iput+0x632/0x7e0 fs/inode.c:1723
 dentry_unlink_inode+0x2e5/0x3d0 fs/dcache.c:374
 __dentry_kill+0x447/0x650 fs/dcache.c:579
 dentry_kill+0xc0/0x2a0
 dput+0x40/0x80 fs/dcache.c:879
 __fput+0x4f4/0x760 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x129/0x190 kernel/task_work.c:165
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc83/0x2a50 kernel/exit.c:861

Memory state around the buggy address:
 ffff88812a145f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812a145f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812a146000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88812a146080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812a146100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================