==================================================================
BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: use-after-free in __ext4_iget+0x36d/0x40e0 fs/ext4/inode.c:4787
Read of size 8 at addr ffff888131c87eb8 by task syz.2.2521/9678

CPU: 0 PID: 9678 Comm: syz.2.2521 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x169/0x1d8 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+0x36d/0x40e0 fs/ext4/inode.c:4787
 ext4_quota_enable fs/ext4/super.c:6447 [inline]
 ext4_enable_quotas+0x33b/0x6d0 fs/ext4/super.c:6483
 ext4_fill_super+0x82a9/0x8b60 fs/ext4/super.c:5060
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 ext4_mount+0x34/0x40 fs/ext4/super.c:6662
 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:2997
 path_mount+0x572/0xc80 fs/namespace.c:3327
 do_mount fs/namespace.c:3340 [inline]
 __do_sys_mount fs/namespace.c:3548 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3525
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3525
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f4c5425838a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4c52cbee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4c52cbeef0 RCX: 00007f4c5425838a
RDX: 0000200000000b80 RSI: 0000200000000bc0 RDI: 00007f4c52cbeeb0
RBP: 0000200000000b80 R08: 00007f4c52cbeef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000bc0
R13: 00007f4c52cbeeb0 R14: 0000000000000b7e R15: 0000200000000c00

Allocated by task 9038:
 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:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2960
 radix_tree_node_alloc+0x18e/0x380 lib/radix-tree.c:251
 __radix_tree_create lib/radix-tree.c:622 [inline]
 radix_tree_insert+0x1cc/0x5e0 lib/radix-tree.c:710
 __insert_free_nid fs/f2fs/node.c:2208 [inline]
 add_free_nid+0x231/0x6c0 fs/f2fs/node.c:2354
 scan_nat_page fs/f2fs/node.c:2410 [inline]
 __f2fs_build_free_nids fs/f2fs/node.c:2516 [inline]
 f2fs_build_free_nids+0xde2/0x1330 fs/f2fs/node.c:2554
 f2fs_build_node_manager+0x164a/0x1da0 fs/f2fs/node.c:3341
 f2fs_fill_super+0x4305/0x6c70 fs/f2fs/super.c:4321
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4595
 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:2997
 path_mount+0x572/0xc80 fs/namespace.c:3327
 do_mount fs/namespace.c:3340 [inline]
 __do_sys_mount fs/namespace.c:3548 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3525
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3525
 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+0x10e/0x1050 kernel/rcu/tree.c:3054
 radix_tree_node_free lib/radix-tree.c:308 [inline]
 delete_node+0x1ce/0xa60 lib/radix-tree.c:571
 __radix_tree_delete+0x257/0x3c0 lib/radix-tree.c:1376
 radix_tree_delete_item+0x25c/0x360 lib/radix-tree.c:1427
 radix_tree_delete+0x1f/0x30 lib/radix-tree.c:1444
 __remove_free_nid fs/f2fs/node.c:2227 [inline]
 f2fs_destroy_node_manager+0x33f/0xfb0 fs/f2fs/node.c:3359
 f2fs_put_super+0x6b5/0xc00 fs/f2fs/super.c:1643
 generic_shutdown_super+0x149/0x320 fs/super.c:465
 kill_block_super+0x7f/0xf0 fs/super.c:1469
 kill_f2fs_super+0x2e7/0x390 fs/f2fs/super.c:4627
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1114
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1121
 task_work_run+0x127/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Second to 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+0x10e/0x1050 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 mm/filemap.c:143 [inline]
 __delete_from_page_cache+0x293/0x460 mm/filemap.c:244
 delete_from_page_cache+0xbe/0x100 mm/filemap.c:279
 truncate_inode_page+0x5d/0x70 mm/truncate.c:225
 shmem_undo_range+0x632/0x1760 mm/shmem.c:964
 shmem_truncate_range mm/shmem.c:1073 [inline]
 shmem_evict_inode+0x1fd/0x9c0 mm/shmem.c:1173
 evict+0x478/0x910 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378
 __dentry_kill+0x44f/0x650 fs/dcache.c:583
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x42/0x80 fs/dcache.c:883
 __fput+0x4fe/0x770 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0x68/0x90 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 ffff888131c87c80
 which belongs to the cache radix_tree_node of size 576
The buggy address is located 568 bytes inside of
 576-byte region [ffff888131c87c80, ffff888131c87ec0)
The buggy address belongs to the page:
page:ffffea0004c72100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888131c85600 pfn:0x131c84
head:ffffea0004c72100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 ffffea0004c77d08 ffffea0004b49208 ffff88810004cf00
raw: ffff888131c85600 0000000000170002 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 1065, ts 100964871712, free_ts 86895370370
 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+0x2235/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1af/0x2e0 mm/slub.c:2960
 radix_tree_node_alloc+0x18e/0x380 lib/radix-tree.c:251
 __radix_tree_create lib/radix-tree.c:622 [inline]
 radix_tree_insert+0x1cc/0x5e0 lib/radix-tree.c:710
 __insert_free_nid fs/f2fs/node.c:2208 [inline]
 add_free_nid+0x231/0x6c0 fs/f2fs/node.c:2354
 scan_nat_page fs/f2fs/node.c:2410 [inline]
 __f2fs_build_free_nids fs/f2fs/node.c:2516 [inline]
 f2fs_build_free_nids+0xde2/0x1330 fs/f2fs/node.c:2554
 f2fs_build_node_manager+0x164a/0x1da0 fs/f2fs/node.c:3341
 f2fs_fill_super+0x4305/0x6c70 fs/f2fs/super.c:4321
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4595
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
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+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443
 release_pages+0xe38/0xe80 mm/swap.c:1103
 __pagevec_release+0x71/0xe0 mm/swap.c:1123
 pagevec_release include/linux/pagevec.h:88 [inline]
 shmem_undo_range+0x6e1/0x1760 mm/shmem.c:969
 shmem_truncate_range mm/shmem.c:1073 [inline]
 shmem_evict_inode+0x1fd/0x9c0 mm/shmem.c:1173
 evict+0x478/0x910 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378
 __dentry_kill+0x44f/0x650 fs/dcache.c:583
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x42/0x80 fs/dcache.c:883
 __fput+0x4fe/0x770 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa4f/0x2480 kernel/exit.c:872

Memory state around the buggy address:
 ffff888131c87d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888131c87e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888131c87e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                        ^
 ffff888131c87f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888131c87f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs warning (device loop2): ext4_enable_quotas:6491: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop2): mount failed