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==================================================================
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 ffff88811c7efeb8 by task syz.2.185/991

CPU: 0 PID: 991 Comm: syz.2.185 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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: 0033:0x7f39c17b0a8a
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:00007f39c0209e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f39c0209ee0 RCX: 00007f39c17b0a8a
RDX: 0000200000000340 RSI: 0000200000000980 RDI: 00007f39c0209ea0
RBP: 0000200000000340 R08: 00007f39c0209ee0 R09: 0000000003000010
R10: 0000000003000010 R11: 0000000000000246 R12: 0000200000000980
R13: 00007f39c0209ea0 R14: 0000000000000519 R15: 0000200000000880

Allocated by task 112:
 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
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
 add_free_nid+0xe7/0x6c0 fs/f2fs/node.c:2311
 scan_free_nid_bits fs/f2fs/node.c:2462 [inline]
 __f2fs_build_free_nids fs/f2fs/node.c:2496 [inline]
 f2fs_build_free_nids+0x687/0x1410 fs/f2fs/node.c:2554
 f2fs_balance_fs_bg+0x134/0x980 fs/f2fs/segment.c:570
 f2fs_write_node_pages+0x14d/0x890 fs/f2fs/node.c:2130
 do_writepages+0x128/0x280 mm/page-writeback.c:2380
 __writeback_single_inode+0xd5/0xa20 fs/fs-writeback.c:1470
 writeback_sb_inodes+0x8ca/0x1480 fs/fs-writeback.c:1733
 wb_writeback+0x403/0xbe0 fs/fs-writeback.c:1908
 wb_do_writeback fs/fs-writeback.c:2053 [inline]
 wb_workfn+0x3ac/0xf30 fs/fs-writeback.c:2094
 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301
 worker_thread+0xa6a/0x13c0 kernel/workqueue.c:2447
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Freed by task 279:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kmem_cache_free+0x100/0x2d0 mm/slub.c:3224
 f2fs_destroy_node_manager+0x3d2/0x1000 fs/f2fs/node.c:3361
 f2fs_put_super+0x6d3/0xc20 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+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
 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+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 ffff88811c7efeb0
 which belongs to the cache f2fs_free_nid of size 24
The buggy address is located 8 bytes inside of
 24-byte region [ffff88811c7efeb0, ffff88811c7efec8)
The buggy address belongs to the page:
page:ffffea000471fbc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c7ef
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea000471fb80 0000001900000019 ffff8881029c8180
raw: 0000000000000000 0000000000660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 475, ts 42248975925, 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
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
 add_free_nid+0xe7/0x6c0 fs/f2fs/node.c:2311
 scan_nat_page fs/f2fs/node.c:2410 [inline]
 __f2fs_build_free_nids fs/f2fs/node.c:2516 [inline]
 f2fs_build_free_nids+0xeb3/0x1410 fs/f2fs/node.c:2554
 f2fs_build_node_manager+0x164a/0x1da0 fs/f2fs/node.c:3341
 f2fs_fill_super+0x4a70/0x73f0 fs/f2fs/super.c:4323
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4598
 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
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811c7efd80: fb fc fc fa fb fb fc fc fa fb fb fc fc fa fb fb
 ffff88811c7efe00: fc fc fa fb fb fc fc fa fb fb fc fc fa fb fb fc
>ffff88811c7efe80: fc fa fb fb fc fc fa fb fb fc fc fa fb fb fc fc
                                        ^
 ffff88811c7eff00: fa fb fb fc fc fa fb fb fc fc fa fb fb fc fc fa
 ffff88811c7eff80: fb fb fc fc fa fb fb fc fc fa fb fb 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