[ 21.113350][ T68] ==================================================================
[ 21.113678][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 21.113985][ T68] Read of size 1 at addr ffff8880072946c4 by task kworker/u16:1/68
[ 21.114283][ T68]
[ 21.114387][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.114392][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.114395][ T68] Workqueue: netns cleanup_net
[ 21.114403][ T68] Call Trace:
[ 21.114405][ T68]
[ 21.114409][ T68] dump_stack_lvl+0x82/0xc0
[ 21.114414][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 21.114421][ T68] ? kobject_put+0xbb/0xd0
[ 21.114425][ T68] print_report+0xb4/0x270
[ 21.114428][ T68] ? kobject_put+0xbb/0xd0
[ 21.114431][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 21.114435][ T68] ? kobject_put+0xbb/0xd0
[ 21.114438][ T68] kasan_report+0xca/0x100
[ 21.114442][ T68] ? kobject_put+0xbb/0xd0
[ 21.114447][ T68] kobject_put+0xbb/0xd0
[ 21.114451][ T68] netdev_run_todo+0x5f0/0xc60
[ 21.114457][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 21.114460][ T68] ? generic_xdp_install+0x410/0x410
[ 21.114463][ T68] ? net_generic+0xb1/0x1f0
[ 21.114471][ T68] ops_undo_list+0x714/0x890
[ 21.114477][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.114480][ T68] ? cleanup_net+0x2d6/0x8b0
[ 21.114486][ T68] cleanup_net+0x3b2/0x8b0
[ 21.114490][ T68] ? net_passive_dec+0x190/0x190
[ 21.114495][ T68] ? rcu_is_watching+0x12/0xb0
[ 21.114502][ T68] process_one_work+0xe35/0x1650
[ 21.114511][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.114516][ T68] ? assign_work+0x168/0x240
[ 21.114521][ T68] worker_thread+0x591/0xcf0
[ 21.114526][ T68] ? rescuer_thread+0xd10/0xd10
[ 21.114530][ T68] kthread+0x37b/0x5f0
[ 21.114535][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.114537][ T68] ? ret_from_fork+0x1b/0x270
[ 21.114542][ T68] ? __lock_release+0x5d/0x170
[ 21.114546][ T68] ? rcu_is_watching+0x12/0xb0
[ 21.114549][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.114553][ T68] ret_from_fork+0x1db/0x270
[ 21.114555][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.114558][ T68] ret_from_fork_asm+0x11/0x20
[ 21.114566][ T68]
[ 21.114568][ T68]
[ 21.122396][ T68] Allocated by task 262:
[ 21.122544][ T68] kasan_save_stack+0x24/0x40
[ 21.122751][ T68] kasan_save_track+0x14/0x30
[ 21.122947][ T68] __kasan_kmalloc+0x7b/0x90
[ 21.123154][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 21.123345][ T68] alloc_netdev_mqs+0x7d/0x1370
[ 21.123640][ T68] ip6_tnl_init_net+0x102/0x3f0
[ 21.123833][ T68] ops_init+0x189/0x550
[ 21.123985][ T68] setup_net+0xf1/0x380
[ 21.124133][ T68] copy_net_ns+0x253/0x510
[ 21.124357][ T68] create_new_namespaces+0x35f/0x900
[ 21.124558][ T68] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 21.124758][ T68] ksys_unshare+0x2be/0x6e0
[ 21.124952][ T68] __x64_sys_unshare+0x31/0x40
[ 21.125143][ T68] do_syscall_64+0xc1/0xfd0
[ 21.125350][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.125683][ T68]
[ 21.125780][ T68] Freed by task 68:
[ 21.125924][ T68] kasan_save_stack+0x24/0x40
[ 21.126216][ T68] kasan_save_track+0x14/0x30
[ 21.126428][ T68] __kasan_save_free_info+0x3b/0x60
[ 21.126628][ T68] __kasan_slab_free+0x3f/0x60
[ 21.126843][ T68] kfree+0x21d/0x540
[ 21.126984][ T68] device_release+0x9c/0x210
[ 21.127256][ T68] kobject_cleanup+0xfe/0x360
[ 21.127437][ T68] netdev_run_todo+0x81f/0xc60
[ 21.127632][ T68] ops_undo_list+0x714/0x890
[ 21.127823][ T68] cleanup_net+0x3b2/0x8b0
[ 21.128009][ T68] process_one_work+0xe35/0x1650
[ 21.128190][ T68] worker_thread+0x591/0xcf0
[ 21.128466][ T68] kthread+0x37b/0x5f0
[ 21.128606][ T68] ret_from_fork+0x1db/0x270
[ 21.128882][ T68] ret_from_fork_asm+0x11/0x20
[ 21.129130][ T68]
[ 21.129215][ T68] The buggy address belongs to the object at ffff888007294000
[ 21.129215][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 21.129788][ T68] The buggy address is located 1732 bytes inside of
[ 21.129788][ T68] freed 4096-byte region [ffff888007294000, ffff888007295000)
[ 21.130217][ T68]
[ 21.130301][ T68] The buggy address belongs to the physical page:
[ 21.130623][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7290
[ 21.130921][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 21.131167][ T68] flags: 0x80000000000040(head|node=0|zone=1)
[ 21.131376][ T68] page_type: f5(slab)
[ 21.131509][ T68] raw: 0080000000000040 ffff888001043700 ffffea0000122c10 ffffea00001dd010
[ 21.131894][ T68] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.132274][ T68] head: 0080000000000040 ffff888001043700 ffffea0000122c10 ffffea00001dd010
[ 21.132568][ T68] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.132849][ T68] head: 0080000000000003 ffffea00001ca401 00000000ffffffff 00000000ffffffff
[ 21.133137][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.133433][ T68] page dumped because: kasan: bad access detected
[ 21.133634][ T68]
[ 21.133717][ T68] Memory state around the buggy address:
[ 21.133874][ T68] ffff888007294580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.134202][ T68] ffff888007294600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.134532][ T68] >ffff888007294680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.134769][ T68] ^
[ 21.134962][ T68] ffff888007294700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.135192][ T68] ffff888007294780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.135520][ T68] ==================================================================
[ 21.135824][ T68] Disabling lock debugging due to kernel taint
[ 21.136082][ T68] ------------[ cut here ]------------
[ 21.136378][ T68] refcount_t: underflow; use-after-free.
[ 21.136563][ T68] WARNING: CPU: 3 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.137061][ T68] Modules linked in: nft_compat nf_tables
[ 21.137256][ T68] CPU: 3 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.137655][ T68] Tainted: [B]=BAD_PAGE
[ 21.137815][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.138029][ T68] Workqueue: netns cleanup_net
[ 21.138224][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.138452][ T68] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 85 85 e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 21.139053][ T68] RSP: 0018:ffffc90000497a08 EFLAGS: 00010282
[ 21.139272][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.139537][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.139797][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0d00934
[ 21.140043][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 21.140302][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.140562][ T68] FS: 0000000000000000(0000) GS:ffff8880e5488000(0000) knlGS:0000000000000000
[ 21.140856][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.141128][ T68] CR2: 00000000004061e9 CR3: 000000000f7d9004 CR4: 0000000000772ef0
[ 21.141398][ T68] PKRU: 55555554
[ 21.141530][ T68] Call Trace:
[ 21.141654][ T68]
[ 21.141740][ T68] netdev_run_todo+0x5f0/0xc60
[ 21.141926][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 21.142100][ T68] ? generic_xdp_install+0x410/0x410
[ 21.142269][ T68] ? net_generic+0xb1/0x1f0
[ 21.142445][ T68] ops_undo_list+0x714/0x890
[ 21.142610][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.142777][ T68] ? cleanup_net+0x2d6/0x8b0
[ 21.142938][ T68] cleanup_net+0x3b2/0x8b0
[ 21.143097][ T68] ? net_passive_dec+0x190/0x190
[ 21.143267][ T68] ? rcu_is_watching+0x12/0xb0
[ 21.143449][ T68] process_one_work+0xe35/0x1650
[ 21.143672][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.143868][ T68] ? assign_work+0x168/0x240
[ 21.144037][ T68] worker_thread+0x591/0xcf0
[ 21.144209][ T68] ? rescuer_thread+0xd10/0xd10
[ 21.144430][ T68] kthread+0x37b/0x5f0
[ 21.144555][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.144727][ T68] ? ret_from_fork+0x1b/0x270
[ 21.144902][ T68] ? __lock_release+0x5d/0x170
[ 21.145066][ T68] ? rcu_is_watching+0x12/0xb0
[ 21.145301][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.145489][ T68] ret_from_fork+0x1db/0x270
[ 21.145651][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.145821][ T68] ret_from_fork_asm+0x11/0x20
[ 21.145985][ T68]
[ 21.146113][ T68] irq event stamp: 15135
[ 21.146241][ T68] hardirqs last enabled at (15135): [] finish_task_switch.isra.0+0x245/0x960
[ 21.146596][ T68] hardirqs last disabled at (15134): [] __schedule+0x94a/0x1b10
[ 21.146892][ T68] softirqs last enabled at (14942): [] handle_softirqs+0x352/0x610
[ 21.147177][ T68] softirqs last disabled at (14937): [] irq_exit_rcu+0xab/0x100
[ 21.147486][ T68] ---[ end trace 0000000000000000 ]---