[ 21.718491][ T71] ==================================================================
[ 21.718788][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 21.719062][ T71] Read of size 1 at addr ffff8880091e96c4 by task kworker/u16:1/71
[ 21.719338][ T71]
[ 21.719438][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.719443][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.719446][ T71] Workqueue: netns cleanup_net
[ 21.719454][ T71] Call Trace:
[ 21.719456][ T71]
[ 21.719458][ T71] dump_stack_lvl+0x82/0xc0
[ 21.719464][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 21.719471][ T71] ? kobject_put+0xbb/0xd0
[ 21.719475][ T71] print_report+0xb4/0x270
[ 21.719478][ T71] ? kobject_put+0xbb/0xd0
[ 21.719481][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 21.719485][ T71] ? kobject_put+0xbb/0xd0
[ 21.719488][ T71] kasan_report+0xca/0x100
[ 21.719492][ T71] ? kobject_put+0xbb/0xd0
[ 21.719497][ T71] kobject_put+0xbb/0xd0
[ 21.719500][ T71] netdev_run_todo+0x5f0/0xc60
[ 21.719506][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 21.719509][ T71] ? generic_xdp_install+0x410/0x410
[ 21.719512][ T71] ? net_generic+0xb1/0x1f0
[ 21.719521][ T71] ops_undo_list+0x714/0x890
[ 21.719526][ T71] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.719530][ T71] ? cleanup_net+0x2d6/0x8b0
[ 21.719536][ T71] cleanup_net+0x3b2/0x8b0
[ 21.719540][ T71] ? net_passive_dec+0x190/0x190
[ 21.719545][ T71] ? rcu_is_watching+0x12/0xb0
[ 21.719552][ T71] process_one_work+0xe35/0x1650
[ 21.719560][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.719566][ T71] ? assign_work+0x168/0x240
[ 21.719570][ T71] worker_thread+0x591/0xcf0
[ 21.719576][ T71] ? rescuer_thread+0xd10/0xd10
[ 21.719580][ T71] kthread+0x37b/0x5f0
[ 21.719584][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.719587][ T71] ? ret_from_fork+0x1b/0x270
[ 21.719593][ T71] ? __lock_release+0x5d/0x170
[ 21.719597][ T71] ? rcu_is_watching+0x12/0xb0
[ 21.719600][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.719604][ T71] ret_from_fork+0x1db/0x270
[ 21.719606][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.719609][ T71] ret_from_fork_asm+0x11/0x20
[ 21.719621][ T71]
[ 21.719622][ T71]
[ 21.726494][ T71] Allocated by task 258:
[ 21.726626][ T71] kasan_save_stack+0x24/0x40
[ 21.726803][ T71] kasan_save_track+0x14/0x30
[ 21.726970][ T71] __kasan_kmalloc+0x7b/0x90
[ 21.727140][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 21.727321][ T71] alloc_netdev_mqs+0x7d/0x1370
[ 21.727495][ T71] ip6_tnl_init_net+0x102/0x3f0
[ 21.727670][ T71] ops_init+0x189/0x550
[ 21.727798][ T71] setup_net+0xf1/0x380
[ 21.727927][ T71] copy_net_ns+0x253/0x510
[ 21.728111][ T71] create_new_namespaces+0x35f/0x900
[ 21.728309][ T71] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 21.728499][ T71] ksys_unshare+0x2be/0x6e0
[ 21.728685][ T71] __x64_sys_unshare+0x31/0x40
[ 21.728871][ T71] do_syscall_64+0xc1/0xfd0
[ 21.729062][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.729288][ T71]
[ 21.729372][ T71] Freed by task 71:
[ 21.729500][ T71] kasan_save_stack+0x24/0x40
[ 21.729674][ T71] kasan_save_track+0x14/0x30
[ 21.729842][ T71] __kasan_save_free_info+0x3b/0x60
[ 21.730032][ T71] __kasan_slab_free+0x3f/0x60
[ 21.730221][ T71] kfree+0x21d/0x540
[ 21.730369][ T71] device_release+0x9c/0x210
[ 21.730547][ T71] kobject_cleanup+0xfe/0x360
[ 21.730726][ T71] netdev_run_todo+0x81f/0xc60
[ 21.730902][ T71] ops_undo_list+0x714/0x890
[ 21.731079][ T71] cleanup_net+0x3b2/0x8b0
[ 21.731265][ T71] process_one_work+0xe35/0x1650
[ 21.731443][ T71] worker_thread+0x591/0xcf0
[ 21.731616][ T71] kthread+0x37b/0x5f0
[ 21.731752][ T71] ret_from_fork+0x1db/0x270
[ 21.731924][ T71] ret_from_fork_asm+0x11/0x20
[ 21.732099][ T71]
[ 21.732195][ T71] The buggy address belongs to the object at ffff8880091e9000
[ 21.732195][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 21.732595][ T71] The buggy address is located 1732 bytes inside of
[ 21.732595][ T71] freed 4096-byte region [ffff8880091e9000, ffff8880091ea000)
[ 21.733008][ T71]
[ 21.733097][ T71] The buggy address belongs to the physical page:
[ 21.733328][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x91e8
[ 21.733630][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 21.733887][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 21.734115][ T71] page_type: f5(slab)
[ 21.734257][ T71] raw: 0080000000000040 ffff888001043700 ffffea000022f810 ffffea000024c810
[ 21.734559][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.734856][ T71] head: 0080000000000040 ffff888001043700 ffffea000022f810 ffffea000024c810
[ 21.735174][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.735498][ T71] head: 0080000000000003 ffffea0000247a01 00000000ffffffff 00000000ffffffff
[ 21.735794][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.736089][ T71] page dumped because: kasan: bad access detected
[ 21.736307][ T71]
[ 21.736390][ T71] Memory state around the buggy address:
[ 21.736553][ T71] ffff8880091e9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.736806][ T71] ffff8880091e9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.737049][ T71] >ffff8880091e9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.737297][ T71] ^
[ 21.737504][ T71] ffff8880091e9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.737751][ T71] ffff8880091e9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.737996][ T71] ==================================================================
[ 21.738363][ T71] Disabling lock debugging due to kernel taint
[ 21.738603][ T71] ------------[ cut here ]------------
[ 21.738786][ T71] refcount_t: underflow; use-after-free.
[ 21.739436][ T71] WARNING: CPU: 1 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.739748][ T71] Modules linked in: sch_etf sch_fq
[ 21.739916][ T71] CPU: 1 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.740347][ T71] Tainted: [B]=BAD_PAGE
[ 21.740467][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.740669][ T71] Workqueue: netns cleanup_net
[ 21.740854][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.741074][ T71] 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 05 a3 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
[ 21.741653][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 21.741860][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.742119][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.742351][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4800934
[ 21.742640][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 21.742899][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.743145][ T71] FS: 0000000000000000(0000) GS:ffff8880c7b88000(0000) knlGS:0000000000000000
[ 21.743424][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.743622][ T71] CR2: 00007fdf77b73610 CR3: 0000000054549001 CR4: 0000000000772ef0
[ 21.743860][ T71] PKRU: 55555554
[ 21.743993][ T71] Call Trace:
[ 21.744116][ T71]
[ 21.744209][ T71] netdev_run_todo+0x5f0/0xc60
[ 21.744380][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 21.744548][ T71] ? generic_xdp_install+0x410/0x410
[ 21.744714][ T71] ? net_generic+0xb1/0x1f0
[ 21.744886][ T71] ops_undo_list+0x714/0x890
[ 21.745063][ T71] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.745240][ T71] ? cleanup_net+0x2d6/0x8b0
[ 21.745411][ T71] cleanup_net+0x3b2/0x8b0
[ 21.745578][ T71] ? net_passive_dec+0x190/0x190
[ 21.745745][ T71] ? rcu_is_watching+0x12/0xb0
[ 21.745920][ T71] process_one_work+0xe35/0x1650
[ 21.746106][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.746269][ T71] ? assign_work+0x168/0x240
[ 21.746426][ T71] worker_thread+0x591/0xcf0
[ 21.746589][ T71] ? rescuer_thread+0xd10/0xd10
[ 21.746742][ T71] kthread+0x37b/0x5f0
[ 21.746861][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.747030][ T71] ? ret_from_fork+0x1b/0x270
[ 21.747188][ T71] ? __lock_release+0x5d/0x170
[ 21.747346][ T71] ? rcu_is_watching+0x12/0xb0
[ 21.747506][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.747659][ T71] ret_from_fork+0x1db/0x270
[ 21.747820][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.747982][ T71] ret_from_fork_asm+0x11/0x20
[ 21.748144][ T71]
[ 21.748265][ T71] irq event stamp: 11413
[ 21.748384][ T71] hardirqs last enabled at (11413): [] finish_task_switch.isra.0+0x245/0x960
[ 21.748693][ T71] hardirqs last disabled at (11412): [] __schedule+0x94a/0x1b10
[ 21.748984][ T71] softirqs last enabled at (11020): [] handle_softirqs+0x352/0x610
[ 21.749254][ T71] softirqs last disabled at (11015): [] irq_exit_rcu+0xab/0x100
[ 21.749522][ T71] ---[ end trace 0000000000000000 ]---