==================================================================
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 ffff88812c682558 by task syz.7.968/4152

CPU: 0 PID: 4152 Comm: syz.7.968 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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: 0033:0x7f17b3a5b8ca
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:00007f17b2493e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f17b2493ee0 RCX: 00007f17b3a5b8ca
RDX: 0000200000000180 RSI: 0000200000000540 RDI: 00007f17b2493ea0
RBP: 0000200000000180 R08: 00007f17b2493ee0 R09: 0000000000008800
R10: 0000000000008800 R11: 0000000000000246 R12: 0000200000000540
R13: 00007f17b2493ea0 R14: 000000000000051a R15: 000000000000002c

Allocated by task 49:
 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:2783 [inline]
 f2fs_alloc_inode+0x26/0x410 fs/f2fs/super.c:1392
 alloc_inode fs/inode.c:233 [inline]
 iget_locked+0x146/0x7d0 fs/inode.c:1275
 f2fs_iget+0x55/0x4b60 fs/f2fs/inode.c:505
 gc_data_segment fs/f2fs/gc.c:1539 [inline]
 do_garbage_collect+0x1ff9/0x5850 fs/f2fs/gc.c:1740
 f2fs_gc+0x9ed/0x1c00 fs/f2fs/gc.c:1842
 f2fs_balance_fs+0x307/0x410 fs/f2fs/segment.c:530
 f2fs_write_single_data_page+0xeb9/0x16e0 fs/f2fs/data.c:2869
 f2fs_write_cache_pages fs/f2fs/data.c:3084 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3234 [inline]
 f2fs_write_data_pages+0x1813/0x2950 fs/f2fs/data.c:3261
 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 49:
 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_free_inode+0x24/0x30 fs/f2fs/super.c:1547
 i_callback+0x4c/0x70 fs/inode.c:222
 rcu_do_batch+0x4ef/0xab0 kernel/rcu/tree.c:2494
 rcu_core+0x577/0xd80 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x255/0x563 kernel/softirq.c:309

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
 destroy_inode fs/inode.c:288 [inline]
 evict+0x881/0x930 fs/inode.c:629
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 iget_failed+0x178/0x1c0 fs/bad_inode.c:242
 f2fs_iget+0x16c1/0x4b60 fs/f2fs/inode.c:574
 gc_data_segment fs/f2fs/gc.c:1539 [inline]
 do_garbage_collect+0x1ff9/0x5850 fs/f2fs/gc.c:1740
 f2fs_gc+0x9ed/0x1c00 fs/f2fs/gc.c:1842
 f2fs_balance_fs+0x307/0x410 fs/f2fs/segment.c:530
 f2fs_write_single_data_page+0xeb9/0x16e0 fs/f2fs/data.c:2869
 f2fs_write_cache_pages fs/f2fs/data.c:3084 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3234 [inline]
 f2fs_write_data_pages+0x1813/0x2950 fs/f2fs/data.c:3261
 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

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+0x11a/0x10b0 kernel/rcu/tree.c:3054
 destroy_inode fs/inode.c:288 [inline]
 evict+0x881/0x930 fs/inode.c:629
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 iget_failed+0x178/0x1c0 fs/bad_inode.c:242
 f2fs_iget+0x16c1/0x4b60 fs/f2fs/inode.c:574
 gc_data_segment fs/f2fs/gc.c:1539 [inline]
 do_garbage_collect+0x1ff9/0x5850 fs/f2fs/gc.c:1740
 f2fs_gc+0x9ed/0x1c00 fs/f2fs/gc.c:1842
 f2fs_balance_fs+0x307/0x410 fs/f2fs/segment.c:530
 f2fs_write_single_data_page+0xeb9/0x16e0 fs/f2fs/data.c:2869
 f2fs_write_cache_pages fs/f2fs/data.c:3084 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3234 [inline]
 f2fs_write_data_pages+0x1813/0x2950 fs/f2fs/data.c:3261
 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

The buggy address belongs to the object at ffff88812c682030
 which belongs to the cache f2fs_inode_cache of size 1520
The buggy address is located 1320 bytes inside of
 1520-byte region [ffff88812c682030, ffff88812c682620)
The buggy address belongs to the page:
page:ffffea0004b1a000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12c680
head:ffffea0004b1a000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 ffffea0004b1a600 0000000600000006 ffff8881029c6d80
raw: 0000000000000000 0000000000130013 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 49, ts 80050018894, free_ts 53208044397
 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:5370
 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:2783 [inline]
 f2fs_alloc_inode+0x26/0x410 fs/f2fs/super.c:1392
 alloc_inode fs/inode.c:233 [inline]
 iget_locked+0x146/0x7d0 fs/inode.c:1275
 f2fs_iget+0x55/0x4b60 fs/f2fs/inode.c:505
 gc_data_segment fs/f2fs/gc.c:1539 [inline]
 do_garbage_collect+0x1ff9/0x5850 fs/f2fs/gc.c:1740
 f2fs_gc+0x9ed/0x1c00 fs/f2fs/gc.c:1842
 f2fs_balance_fs+0x307/0x410 fs/f2fs/segment.c:530
 f2fs_write_single_data_page+0xeb9/0x16e0 fs/f2fs/data.c:2869
 f2fs_write_cache_pages fs/f2fs/data.c:3084 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3234 [inline]
 f2fs_write_data_pages+0x1813/0x2950 fs/f2fs/data.c:3261
 do_writepages+0x128/0x280 mm/page-writeback.c:2380
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+0x80b/0x830 mm/page_alloc.c:1629
 free_the_page mm/page_alloc.c:5431 [inline]
 __free_pages+0xd8/0x3b0 mm/page_alloc.c:5440
 __free_slab+0xcf/0x190 mm/slub.c:1899
 free_slab mm/slub.c:1914 [inline]
 discard_slab mm/slub.c:1920 [inline]
 unfreeze_partials+0x15f/0x190 mm/slub.c:2415
 put_cpu_partial+0xc1/0x180 mm/slub.c:2451
 __slab_free+0x2c9/0x3a0 mm/slub.c:3100
 do_slab_free mm/slub.c:3196 [inline]
 ___cache_free+0x10e/0x130 mm/slub.c:3215
 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:440
 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
 getname_flags+0xb9/0x500 fs/namei.c:141
 getname+0x19/0x20 fs/namei.c:212
 do_sys_openat2+0xde/0x750 fs/open.c:1213

Memory state around the buggy address:
 ffff88812c682400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812c682480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88812c682500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88812c682580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812c682600: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs warning (device loop7): ext4_enable_quotas:6490: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop7): mount failed