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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x696/0xca0
Write of size 8 at addr ffff888029a19fb0 by task kworker/u8:6/10947

CPU: 1 UID: 0 PID: 10947 Comm: kworker/u8:6 Not tainted 6.16.0-syzkaller-12084-g33caa208dba6 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 __xfrm_state_delete+0x696/0xca0
 xfrm_timer_handler+0x18f/0xa00
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_is_held_type+0x137/0x190
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 f9 33 27 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90006d67440 EFLAGS: 00000206
RAX: 3d2b23f28f56d600 RBX: 0000000000000001 RCX: 3d2b23f28f56d600
RDX: ffff8880277c5640 RSI: ffffffff8dba39a7 RDI: ffffffff8be32680
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff825d2bec
R10: dffffc0000000000 R11: ffffed10070628d3 R12: 0000000000000246
R13: ffff8880277c5640 R14: ffffffff8e139ee0 R15: 0000000000000005
 kernfs_root+0xf6/0x230
 kernfs_parent+0x51/0x190
 __kernfs_remove+0x343/0x570
 kernfs_remove+0x38/0x60
 sysfs_remove_group+0x236/0x2c0
 sysfs_remove_groups+0x54/0xb0
 device_remove_attrs+0x1aa/0x260
 device_del+0x509/0x8e0
 unregister_netdevice_many_notify+0x1a6b/0x1ff0
 ops_undo_list+0x3dc/0x990
 cleanup_net+0x4c5/0x800
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 14757:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 xfrm_alloc_userspi+0x6b3/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5882:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 xfrm_state_gc_task+0x52d/0x6b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff888029a19f80
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff888029a19f80, ffff888029a1a320)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888029a1b180 pfn:0x29a18
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff8881053e7280 dead000000000122 0000000000000000
raw: ffff888029a1b180 00000000800e0005 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff8881053e7280 dead000000000122 0000000000000000
head: ffff888029a1b180 00000000800e0005 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000a68601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6052, tgid 6050 (syz.1.45), ts 58773333252, free_ts 58646587909
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 kmem_cache_alloc_noprof+0x283/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 pfkey_getspi+0x65d/0xee0
 pfkey_sendmsg+0xbfe/0x1090
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
page last free pid 5592 tgid 5592 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 rtmsg_fib+0xea/0x4c0
 fib_table_delete+0xca9/0xf80
 fib_magic+0x2e4/0x390
 fib_del_ifaddr+0x1082/0x1480
 fib_inetaddr_event+0xbb/0x190
 notifier_call_chain+0x1b6/0x3e0
 blocking_notifier_call_chain+0x6a/0x90
 __inet_del_ifa+0x87d/0x1040
 inet_rtm_deladdr+0x664/0x740
 rtnetlink_rcv_msg+0x7cf/0xb70

Memory state around the buggy address:
 ffff888029a19e80: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888029a19f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888029a19f80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888029a1a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888029a1a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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