loop7: detected capacity change from 0 to 4096
EXT4-fs (loop7): mounted filesystem without journal. Opts: data_err=abort,,errors=continue. Quota mode: writeback.
==================================================================
BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: use-after-free in __ext4_iget+0x2bb/0x3e80 fs/ext4/inode.c:4722
Read of size 8 at addr ffff8881119fd9e8 by task syz.7.7319/17502

CPU: 0 PID: 17502 Comm: syz.7.7319 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 check_igot_inode fs/ext4/inode.c:-1 [inline]
 __ext4_iget+0x2bb/0x3e80 fs/ext4/inode.c:4722
 ext4_quota_enable fs/ext4/super.c:6435 [inline]
 ext4_enable_quotas+0x338/0x6d0 fs/ext4/super.c:6471
 ext4_remount+0x17ed/0x2530 fs/ext4/super.c:6013
 legacy_reconfigure+0xfa/0x110 fs/fs_context.c:634
 reconfigure_super+0x225/0x8a0 fs/super.c:938
 do_remount fs/namespace.c:2698 [inline]
 path_mount+0xc7b/0xff0 fs/namespace.c:3359
 do_mount fs/namespace.c:3380 [inline]
 __do_sys_mount fs/namespace.c:3588 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3565
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc4bd639019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fc4bc092028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc4bd8c0fa0 RCX: 00007fc4bd639019
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007fc4bd6d000c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002390024 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4bd8c1038 R14: 00007fc4bd8c0fa0 R15: 00007ffc8ab7bc68
 </TASK>

Allocated by task 16391:
 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:433 [inline]
 __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2817 [inline]
 f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1459
 alloc_inode fs/inode.c:264 [inline]
 iget_locked+0x175/0x850 fs/inode.c:1318
 f2fs_iget+0x55/0x5020 fs/f2fs/inode.c:517
 f2fs_fill_super+0x4af9/0x6dd0 fs/f2fs/super.c:4471
 mount_bdev+0x28d/0x3c0 fs/super.c:1400
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4713
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x251/0xb40 fs/namespace.c:3037
 path_mount+0x640/0xff0 fs/namespace.c:3367
 do_mount fs/namespace.c:3380 [inline]
 __do_sys_mount fs/namespace.c:3588 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3565
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

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_common kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x10b/0xf60 kernel/rcu/tree.c:3129
 destroy_inode fs/inode.c:319 [inline]
 evict+0x810/0x8b0 fs/inode.c:665
 dispose_list fs/inode.c:683 [inline]
 evict_inodes+0x62a/0x6a0 fs/inode.c:737
 generic_shutdown_super+0x96/0x330 fs/super.c:454
 kill_block_super+0x7f/0xf0 fs/super.c:1427
 kill_f2fs_super+0x30a/0x3d0 fs/f2fs/super.c:4745
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

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_common kernel/rcu/tree.c:3011 [inline]
 call_rcu+0x10b/0xf60 kernel/rcu/tree.c:3129
 destroy_inode fs/inode.c:319 [inline]
 evict+0x810/0x8b0 fs/inode.c:665
 iput_final fs/inode.c:1779 [inline]
 iput+0x651/0x7e0 fs/inode.c:1805
 f2fs_destroy_compress_inode+0x4f/0x80 fs/f2fs/compress.c:2018
 f2fs_put_super+0x619/0xbd0 fs/f2fs/super.c:1688
 generic_shutdown_super+0x151/0x330 fs/super.c:475
 kill_block_super+0x7f/0xf0 fs/super.c:1427
 kill_f2fs_super+0x30a/0x3d0 fs/f2fs/super.c:4745
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1156
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff8881119fd4e0
 which belongs to the cache f2fs_inode_cache of size 1424
The buggy address is located 1288 bytes inside of
 1424-byte region [ffff8881119fd4e0, ffff8881119fda70)
The buggy address belongs to the page:
page:ffffea0004467e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881119fe100 pfn:0x1119f8
head:ffffea0004467e00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea0004d0c600 0000000200000002 ffff8881081f7800
raw: ffff8881119fe100 0000000080150001 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 331, ts 26695805067, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2817 [inline]
 f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1459
 alloc_inode fs/inode.c:264 [inline]
 iget_locked+0x175/0x850 fs/inode.c:1318
 f2fs_iget+0x55/0x5020 fs/f2fs/inode.c:517
 f2fs_fill_super+0x3ccd/0x6dd0 fs/f2fs/super.c:4352
 mount_bdev+0x28d/0x3c0 fs/super.c:1400
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4713
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881119fd880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881119fd900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881119fd980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8881119fda00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff8881119fda80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc 00 00
==================================================================
EXT4-fs warning (device loop7): ext4_enable_quotas:6479: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.