==================================================================
BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: use-after-free in __ext4_iget+0x36a/0x4030 fs/ext4/inode.c:4787
Read of size 8 at addr ffff888135c93f18 by task syz.2.12199/13809

CPU: 1 PID: 13809 Comm: syz.2.12199 Tainted: G        W         5.10.237-syzkaller-00010-gcf6ed0f1511d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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+0x36a/0x4030 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:2918
 path_mount+0x572/0xc80 fs/namespace.c:3248
 do_mount fs/namespace.c:3261 [inline]
 __do_sys_mount fs/namespace.c:3469 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3446
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3446
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f35a41b110a
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:00007f35a2817e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f35a2817ef0 RCX: 00007f35a41b110a
RDX: 0000200000000140 RSI: 0000200000000640 RDI: 00007f35a2817eb0
RBP: 0000200000000140 R08: 00007f35a2817ef0 R09: 0000000003014850
R10: 0000000003014850 R11: 0000000000000246 R12: 0000200000000640
R13: 00007f35a2817eb0 R14: 00000000000004de R15: 0000200000000700

Allocated by task 10099:
 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:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2960
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2779 [inline]
 f2fs_alloc_inode+0x26/0x410 fs/f2fs/super.c:1373
 alloc_inode fs/inode.c:233 [inline]
 iget_locked+0x146/0x7d0 fs/inode.c:1275
 f2fs_iget+0x55/0x4dc0 fs/f2fs/inode.c:498
 f2fs_fill_super+0x468e/0x6c70 fs/f2fs/super.c:4309
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4548
 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:2918
 path_mount+0x572/0xc80 fs/namespace.c:3248
 do_mount fs/namespace.c:3261 [inline]
 __do_sys_mount fs/namespace.c:3469 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3446
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3446
 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:2976 [inline]
 call_rcu+0x105/0x1040 kernel/rcu/tree.c:3050
 destroy_inode fs/inode.c:288 [inline]
 evict+0x857/0x910 fs/inode.c:629
 dispose_list fs/inode.c:647 [inline]
 evict_inodes+0x5d4/0x640 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+0x2e7/0x390 fs/f2fs/super.c:4580
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 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:2976 [inline]
 call_rcu+0x105/0x1040 kernel/rcu/tree.c:3050
 destroy_inode fs/inode.c:288 [inline]
 evict+0x857/0x910 fs/inode.c:629
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 f2fs_put_super+0x649/0xc00 fs/f2fs/super.c:1611
 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:4580
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x446/0x500 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 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 ffff888135c939f0
 which belongs to the cache f2fs_inode_cache of size 1520
The buggy address is located 1320 bytes inside of
 1520-byte region [ffff888135c939f0, ffff888135c93fe0)
The buggy address belongs to the page:
page:ffffea0004d72400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888135c95a20 pfn:0x135c90
head:ffffea0004d72400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 ffffea0004d71a00 0000000300000003 ffff8881029bf080
raw: ffff888135c95a20 0000000080130005 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 13608, ts 732157916219, free_ts 606490784459
 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:5349
 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
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2779 [inline]
 f2fs_alloc_inode+0x26/0x410 fs/f2fs/super.c:1373
 alloc_inode fs/inode.c:233 [inline]
 iget_locked+0x146/0x7d0 fs/inode.c:1275
 f2fs_iget+0x55/0x4dc0 fs/f2fs/inode.c:498
 f2fs_fill_super+0x45ba/0x6c70 fs/f2fs/super.c:4301
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4548
 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:2918
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_pages_ok+0x7fc/0x820 mm/page_alloc.c:1629
 free_the_page mm/page_alloc.c:5410 [inline]
 __free_pages+0xdd/0x380 mm/page_alloc.c:5419
 kfree+0x1e7/0x270 mm/slub.c:4188
 kvfree+0x35/0x40 mm/util.c:647
 ptr_ring_cleanup include/linux/ptr_ring.h:671 [inline]
 pfifo_fast_destroy+0xbf/0xd0 net/sched/sch_generic.c:805
 qdisc_destroy+0x9e/0x250 net/sched/sch_generic.c:999
 qdisc_put net/sched/sch_generic.c:1018 [inline]
 dev_shutdown+0x459/0x580 net/sched/sch_generic.c:1381
 unregister_netdevice_many+0x92d/0x1980 net/core/dev.c:10760
 ip_tunnel_delete_nets+0x343/0x390 net/ipv4/ip_tunnel.c:1136
 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1706
 ops_exit_list net/core/net_namespace.c:190 [inline]
 cleanup_net+0x5fb/0xb70 net/core/net_namespace.c:609
 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301
 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff888135c93e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888135c93e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888135c93f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888135c93f80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888135c94000: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00
==================================================================
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