==================================================================
BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: use-after-free in __ext4_iget+0x381/0x44c0 fs/ext4/inode.c:4798
Read of size 8 at addr ffff88811cb37eb8 by task syz.2.128/817

CPU: 1 PID: 817 Comm: syz.2.128 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 mm/kasan/report.c:452
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 check_igot_inode fs/ext4/inode.c:-1 [inline]
 __ext4_iget+0x381/0x44c0 fs/ext4/inode.c:4798
 ext4_quota_enable fs/ext4/super.c:6446 [inline]
 ext4_enable_quotas+0x33c/0x6d0 fs/ext4/super.c:6482
 ext4_fill_super+0x84ad/0x8d70 fs/ext4/super.c:5059
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 ext4_mount+0x34/0x40 fs/ext4/super.c:6661
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa20 fs/namespace.c:3006
 path_mount+0x585/0xc90 fs/namespace.c:3336
 do_mount fs/namespace.c:3349 [inline]
 __do_sys_mount fs/namespace.c:3557 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3534
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7feac0169a0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007feabebc2e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007feabebc2ee0 RCX: 00007feac0169a0a
RDX: 0000200000000080 RSI: 0000200000000280 RDI: 00007feabebc2ea0
RBP: 0000200000000080 R08: 00007feabebc2ee0 R09: 0000000002800000
R10: 0000000002800000 R11: 0000000000000246 R12: 0000200000000280
R13: 00007feabebc2ea0 R14: 0000000000000bc8 R15: 0000200000000500

Allocated by task 308:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x162/0x2d0 mm/slub.c:2965
 xas_alloc lib/xarray.c:374 [inline]
 xas_create+0xe1d/0x1450 lib/xarray.c:676
 xas_store+0x9c/0x17f0 lib/xarray.c:786
 __add_to_page_cache_locked+0x474/0x9a0 mm/filemap.c:889
 add_to_page_cache_lru+0xa7/0x210 mm/filemap.c:948
 pagecache_get_page+0x700/0x930 mm/filemap.c:1859
 find_or_create_page include/linux/pagemap.h:402 [inline]
 grab_cache_page include/linux/pagemap.h:485 [inline]
 f2fs_grab_cache_page fs/f2fs/f2fs.h:2707 [inline]
 f2fs_get_read_data_page+0x13e/0x7a0 fs/f2fs/data.c:1212
 f2fs_find_data_page+0x18f/0x3f0 fs/f2fs/data.c:1285
 find_in_level fs/f2fs/dir.c:377 [inline]
 __f2fs_find_entry+0x6d4/0xda0 fs/f2fs/dir.c:449
 f2fs_lookup+0x27d/0xd30 fs/f2fs/namei.c:529
 lookup_open fs/namei.c:3234 [inline]
 open_last_lookups fs/namei.c:3325 [inline]
 path_openat+0x1140/0x31c0 fs/namei.c:3514
 do_filp_open+0x1e2/0x410 fs/namei.c:3544
 do_sys_openat2+0x19f/0x750 fs/open.c:1219
 do_sys_open fs/open.c:1235 [inline]
 __do_sys_open fs/open.c:1243 [inline]
 __se_sys_open fs/open.c:1239 [inline]
 __x64_sys_open+0x11c/0x140 fs/open.c:1239
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:2980 [inline]
 call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054
 xa_node_free lib/xarray.c:258 [inline]
 xas_delete_node lib/xarray.c:494 [inline]
 update_node lib/xarray.c:758 [inline]
 xas_store+0xefb/0x17f0 lib/xarray.c:843
 page_cache_delete_batch mm/filemap.c:342 [inline]
 delete_from_page_cache_batch+0x591/0x960 mm/filemap.c:363
 truncate_inode_pages_range+0x76f/0x16d0 mm/truncate.c:363
 truncate_inode_pages mm/truncate.c:473 [inline]
 truncate_inode_pages_final+0xc0/0xd0 mm/truncate.c:524
 f2fs_evict_inode+0x17a/0x14e0 fs/f2fs/inode.c:764
 evict+0x4ae/0x930 fs/inode.c:612
 dispose_list fs/inode.c:647 [inline]
 evict_inodes+0x5dc/0x650 fs/inode.c:701
 generic_shutdown_super+0x96/0x320 fs/super.c:454
 kill_block_super+0x7f/0xf0 fs/super.c:1469
 kill_f2fs_super+0x303/0x3b0 fs/f2fs/super.c:4630
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa90/0x2500 kernel/exit.c:872
 do_group_exit+0x141/0x310 kernel/exit.c:986
 get_signal+0xf7d/0x12e0 kernel/signal.c:2793
 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88811cb37c80
 which belongs to the cache radix_tree_node of size 576
The buggy address is located 568 bytes inside of
 576-byte region [ffff88811cb37c80, ffff88811cb37ec0)
The buggy address belongs to the page:
page:ffffea000472cd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811cb37700 pfn:0x11cb34
head:ffffea000472cd00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 ffffea0004724408 ffffea000472e308 ffff88810004cf00
raw: ffff88811cb37700 0000000000170005 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x152a30(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 308, ts 29069866292, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x1ac/0x2d0 mm/slub.c:2965
 radix_tree_node_alloc+0x18e/0x380 lib/radix-tree.c:251
 idr_get_free+0x285/0x8f0 lib/radix-tree.c:1503
 idr_alloc_u32+0x18c/0x310 lib/idr.c:48
 idr_alloc_cyclic+0x9d/0x1a0 lib/idr.c:127
 __kernfs_new_node+0x133/0x6b0 fs/kernfs/dir.c:669
 kernfs_new_node+0x150/0x260 fs/kernfs/dir.c:739
 __kernfs_create_file+0x4e/0x270 fs/kernfs/file.c:987
 sysfs_add_file_mode_ns+0x29a/0x350 fs/sysfs/file.c:306
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x495/0xd00 fs/sysfs/group.c:149
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811cb37d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811cb37e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811cb37e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                        ^
 ffff88811cb37f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811cb37f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs warning (device loop2): ext4_enable_quotas:6490: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop2): mount failed