System zones: 0-1, 3-36
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
==================================================================
BUG: KASAN: use-after-free in ext4_get_inode_usage+0x493/0x640 fs/ext4/xattr.c:874
Read of size 4 at addr ffff8880606840f0 by task syz.0.17/6328

CPU: 0 UID: 0 PID: 6328 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ext4_get_inode_usage+0x493/0x640 fs/ext4/xattr.c:874
 __dquot_transfer+0x17b/0x2320 fs/quota/dquot.c:2026
 dquot_transfer+0x48f/0x660 fs/quota/dquot.c:2189
 ext4_setattr+0x894/0x1d60 fs/ext4/inode.c:5935
 notify_change+0xc1a/0xf40 fs/attr.c:556
 chown_common+0x466/0x6b0 fs/open.c:776
 vfs_fchown fs/open.c:841 [inline]
 ksys_fchown+0xe9/0x160 fs/open.c:853
 __do_sys_fchown fs/open.c:858 [inline]
 __se_sys_fchown fs/open.c:856 [inline]
 __x64_sys_fchown+0x7a/0x90 fs/open.c:856
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10a/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdb3739ce59
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:00007fdb38181028 EFLAGS: 00000246 ORIG_RAX: 000000000000005d
RAX: ffffffffffffffda RBX: 00007fdb37615fa0 RCX: 00007fdb3739ce59
RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fdb37432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdb37616038 R14: 00007fdb37615fa0 R15: 00007fff459602a8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888060684000 pfn:0x60684
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001d72008 ffffea000179f708 0000000000000000
raw: ffff888060684000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5832, tgid 5832 (scp), ts 97396939607, free_ts 121089292371
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x238/0x280 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0x24a0/0x2520 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab+0x77/0x650 mm/slub.c:3467
 new_slab mm/slub.c:3525 [inline]
 refill_objects+0x339/0x3c0 mm/slub.c:7272
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x321/0x710 mm/slub.c:4652
 alloc_from_pcs mm/slub.c:4750 [inline]
 slab_alloc_node mm/slub.c:4884 [inline]
 kmem_cache_alloc_node_noprof+0x40d/0x650 mm/slub.c:4951
 kmalloc_reserve net/core/skbuff.c:613 [inline]
 __alloc_skb+0x27d/0x770 net/core/skbuff.c:713
 napi_alloc_skb+0x5d/0x7a0 net/core/skbuff.c:853
 page_to_skb+0x225/0x14a0 drivers/net/virtio_net.c:884
 receive_mergeable drivers/net/virtio_net.c:2411 [inline]
 receive_buf+0x766/0x1c80 drivers/net/virtio_net.c:2575
 virtnet_receive_packets drivers/net/virtio_net.c:2900 [inline]
 virtnet_receive drivers/net/virtio_net.c:2924 [inline]
 virtnet_poll+0x215e/0x2e70 drivers/net/virtio_net.c:3013
 __napi_poll+0xae/0x320 net/core/dev.c:7733
 napi_poll net/core/dev.c:7796 [inline]
 net_rx_action+0x622/0xce0 net/core/dev.c:7953
 handle_softirqs+0x22a/0x830 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x210 kernel/softirq.c:735
page last free pid 3292 tgid 3292 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0xb6f/0xcb0 mm/page_alloc.c:2943
 __slab_free+0x274/0x2c0 mm/slub.c:5613
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x60 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4570 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kmalloc_noprof+0x311/0x730 mm/slub.c:5308
 kmalloc_noprof include/linux/slab.h:954 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 ethnl_default_notify+0x196/0xac0 net/ethtool/netlink.c:989
 ethtool_notify net/ethtool/netlink.c:1094 [inline]
 ethnl_notify_features net/ethtool/netlink.c:1102 [inline]
 ethnl_netdev_event+0xe2/0x160 net/ethtool/netlink.c:1117
 notifier_call_chain+0x1ad/0x3c0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers net/core/dev.c:2301 [inline]
 netdev_features_change net/core/dev.c:1590 [inline]
 netdev_change_features net/core/dev.c:11103 [inline]
 netdev_compute_master_upper_features+0x91e/0xac0 net/core/dev.c:12870
 team_port_del+0xcc0/0xe70 drivers/net/team/team_core.c:1448
 team_del_slave_on_unregister drivers/net/team/team_core.c:2110 [inline]
 team_device_event+0x1ec/0x570 drivers/net/team/team_core.c:3171
 notifier_call_chain+0x1ad/0x3c0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers net/core/dev.c:2301 [inline]
 unregister_netdevice_many_notify+0x17a3/0x22a0 net/core/dev.c:12421
 unregister_netdevice_many net/core/dev.c:12484 [inline]
 default_device_exit_batch+0xaf0/0xb70 net/core/dev.c:13076
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252

Memory state around the buggy address:
 ffff888060683f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888060684000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888060684080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff888060684100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888060684180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================