[ 17.074502][ T69] ==================================================================
[ 17.074856][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 17.075101][ T69] Read of size 1 at addr ffff8880083a9694 by task kworker/u16:1/69
[ 17.075363][ T69]
[ 17.075455][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.075460][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.075463][ T69] Workqueue: netns cleanup_net
[ 17.075470][ T69] Call Trace:
[ 17.075472][ T69]
[ 17.075475][ T69] dump_stack_lvl+0x82/0xc0
[ 17.075480][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 17.075487][ T69] ? kobject_put+0xbb/0xd0
[ 17.075491][ T69] print_report+0xb4/0x270
[ 17.075494][ T69] ? kobject_put+0xbb/0xd0
[ 17.075497][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 17.075501][ T69] ? kobject_put+0xbb/0xd0
[ 17.075504][ T69] kasan_report+0xca/0x100
[ 17.075508][ T69] ? kobject_put+0xbb/0xd0
[ 17.075513][ T69] kobject_put+0xbb/0xd0
[ 17.075516][ T69] netdev_run_todo+0x5f0/0xc60
[ 17.075521][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 17.075525][ T69] ? generic_xdp_install+0x410/0x410
[ 17.075532][ T69] ops_undo_list+0x714/0x890
[ 17.075536][ T69] ? netns_get+0x110/0x110
[ 17.075537][ T69] ? cleanup_net+0x2d6/0x830
[ 17.075542][ T69] cleanup_net+0x3b2/0x830
[ 17.075545][ T69] ? net_passive_dec+0x190/0x190
[ 17.075549][ T69] ? rcu_is_watching+0x12/0xb0
[ 17.075555][ T69] process_one_work+0xe35/0x1650
[ 17.075562][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.075567][ T69] ? assign_work+0x168/0x240
[ 17.075570][ T69] worker_thread+0x591/0xcf0
[ 17.075576][ T69] ? rescuer_thread+0xd10/0xd10
[ 17.075579][ T69] kthread+0x37b/0x5f0
[ 17.075582][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.075584][ T69] ? ret_from_fork+0x1b/0x270
[ 17.075589][ T69] ? __lock_release+0x5d/0x170
[ 17.075595][ T69] ? rcu_is_watching+0x12/0xb0
[ 17.075598][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.075601][ T69] ret_from_fork+0x1db/0x270
[ 17.075604][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.075606][ T69] ret_from_fork_asm+0x11/0x20
[ 17.075615][ T69]
[ 17.075616][ T69]
[ 17.082650][ T69] Allocated by task 228:
[ 17.082840][ T69] kasan_save_stack+0x24/0x40
[ 17.083113][ T69] kasan_save_track+0x14/0x30
[ 17.083377][ T69] __kasan_kmalloc+0x7b/0x90
[ 17.083636][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 17.083896][ T69] alloc_netdev_mqs+0x7d/0x1310
[ 17.084174][ T69] sit_init_net+0x169/0x550
[ 17.084440][ T69] ops_init+0x189/0x550
[ 17.084644][ T69] setup_net+0xf1/0x380
[ 17.084854][ T69] copy_net_ns+0x21a/0x380
[ 17.085117][ T69] create_new_namespaces+0x35f/0x900
[ 17.085373][ T69] unshare_nsproxy_namespaces+0x89/0x120
[ 17.085628][ T69] ksys_unshare+0x2a3/0x660
[ 17.085873][ T69] __x64_sys_unshare+0x31/0x40
[ 17.086122][ T69] do_syscall_64+0xc1/0xfd0
[ 17.086438][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.086699][ T69]
[ 17.086807][ T69] Freed by task 69:
[ 17.086933][ T69] kasan_save_stack+0x24/0x40
[ 17.087172][ T69] kasan_save_track+0x14/0x30
[ 17.087388][ T69] __kasan_save_free_info+0x3b/0x60
[ 17.087580][ T69] __kasan_slab_free+0x3f/0x60
[ 17.087762][ T69] kfree+0x21d/0x540
[ 17.087895][ T69] device_release+0x9c/0x210
[ 17.088106][ T69] kobject_cleanup+0xfe/0x360
[ 17.088314][ T69] netdev_run_todo+0x81f/0xc60
[ 17.088499][ T69] ops_undo_list+0x714/0x890
[ 17.088672][ T69] cleanup_net+0x3b2/0x830
[ 17.088871][ T69] process_one_work+0xe35/0x1650
[ 17.089066][ T69] worker_thread+0x591/0xcf0
[ 17.089250][ T69] kthread+0x37b/0x5f0
[ 17.089384][ T69] ret_from_fork+0x1db/0x270
[ 17.089580][ T69] ret_from_fork_asm+0x11/0x20
[ 17.089749][ T69]
[ 17.089843][ T69] The buggy address belongs to the object at ffff8880083a9000
[ 17.089843][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 17.090264][ T69] The buggy address is located 1684 bytes inside of
[ 17.090264][ T69] freed 4096-byte region [ffff8880083a9000, ffff8880083aa000)
[ 17.090735][ T69]
[ 17.090827][ T69] The buggy address belongs to the physical page:
[ 17.091065][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x83a8
[ 17.091385][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 17.091660][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 17.091977][ T69] page_type: f5(slab)
[ 17.092114][ T69] raw: 0080000000000040 ffff888001043700 ffffea0000210c10 ffffea0000233a10
[ 17.092436][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.092838][ T69] head: 0080000000000040 ffff888001043700 ffffea0000210c10 ffffea0000233a10
[ 17.093145][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.093452][ T69] head: 0080000000000003 ffffea000020ea01 00000000ffffffff 00000000ffffffff
[ 17.093854][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 17.094203][ T69] page dumped because: kasan: bad access detected
[ 17.094516][ T69]
[ 17.094607][ T69] Memory state around the buggy address:
[ 17.094763][ T69] ffff8880083a9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.095003][ T69] ffff8880083a9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.095361][ T69] >ffff8880083a9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.095618][ T69] ^
[ 17.095773][ T69] ffff8880083a9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.096099][ T69] ffff8880083a9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.096369][ T69] ==================================================================
[ 17.096738][ T69] Disabling lock debugging due to kernel taint
[ 17.096939][ T69] ------------[ cut here ]------------
[ 17.097105][ T69] refcount_t: underflow; use-after-free.
[ 17.097308][ T69] WARNING: CPU: 0 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.097635][ T69] Modules linked in: veth
[ 17.097762][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.098333][ T69] Tainted: [B]=BAD_PAGE
[ 17.098510][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.098744][ T69] Workqueue: netns cleanup_net
[ 17.098915][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.099302][ T69] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d 45 90 e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 17.100082][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 17.100369][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.100661][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.101188][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff21be134
[ 17.101599][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 17.101973][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.103979][ T69] FS: 0000000000000000(0000) GS:ffff8880a4010000(0000) knlGS:0000000000000000
[ 17.104328][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.104561][ T69] CR2: 00007f88e0e37000 CR3: 00000000051bd002 CR4: 0000000000772ef0
[ 17.104887][ T69] PKRU: 55555554
[ 17.105011][ T69] Call Trace:
[ 17.105131][ T69]
[ 17.105224][ T69] netdev_run_todo+0x5f0/0xc60
[ 17.105492][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 17.105675][ T69] ? generic_xdp_install+0x410/0x410
[ 17.105840][ T69] ops_undo_list+0x714/0x890
[ 17.106002][ T69] ? netns_get+0x110/0x110
[ 17.106255][ T69] ? cleanup_net+0x2d6/0x830
[ 17.106427][ T69] cleanup_net+0x3b2/0x830
[ 17.106610][ T69] ? net_passive_dec+0x190/0x190
[ 17.106778][ T69] ? rcu_is_watching+0x12/0xb0
[ 17.107042][ T69] process_one_work+0xe35/0x1650
[ 17.107310][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.107505][ T69] ? assign_work+0x168/0x240
[ 17.107691][ T69] worker_thread+0x591/0xcf0
[ 17.107938][ T69] ? rescuer_thread+0xd10/0xd10
[ 17.108111][ T69] kthread+0x37b/0x5f0
[ 17.108240][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.108406][ T69] ? ret_from_fork+0x1b/0x270
[ 17.108604][ T69] ? __lock_release+0x5d/0x170
[ 17.108778][ T69] ? rcu_is_watching+0x12/0xb0
[ 17.108938][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.109122][ T69] ret_from_fork+0x1db/0x270
[ 17.109313][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.109601][ T69] ret_from_fork_asm+0x11/0x20
[ 17.109765][ T69]
[ 17.109892][ T69] irq event stamp: 2601
[ 17.110016][ T69] hardirqs last enabled at (2601): [] irqentry_exit+0x3b/0x80
[ 17.110511][ T69] hardirqs last disabled at (2600): [] handle_softirqs+0x47f/0x610
[ 17.110837][ T69] softirqs last enabled at (2528): [] handle_softirqs+0x352/0x610
[ 17.111145][ T69] softirqs last disabled at (2521): [] irq_exit_rcu+0xab/0x100
[ 17.111463][ T69] ---[ end trace 0000000000000000 ]---