[ 21.806077][ T69] ==================================================================
[ 21.806395][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 21.806709][ T69] Read of size 1 at addr ffff888005b716c4 by task kworker/u16:1/69
[ 21.807078][ T69]
[ 21.807180][ T69] CPU: 1 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.807186][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.807190][ T69] Workqueue: netns cleanup_net
[ 21.807200][ T69] Call Trace:
[ 21.807203][ T69]
[ 21.807207][ T69] dump_stack_lvl+0x82/0xc0
[ 21.807219][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 21.807231][ T69] ? kobject_put+0xbb/0xd0
[ 21.807238][ T69] print_report+0xb4/0x270
[ 21.807244][ T69] ? kobject_put+0xbb/0xd0
[ 21.807249][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 21.807255][ T69] ? kobject_put+0xbb/0xd0
[ 21.807259][ T69] kasan_report+0xca/0x100
[ 21.807265][ T69] ? kobject_put+0xbb/0xd0
[ 21.807275][ T69] kobject_put+0xbb/0xd0
[ 21.807281][ T69] netdev_run_todo+0x5f0/0xc60
[ 21.807290][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 21.807296][ T69] ? generic_xdp_install+0x410/0x410
[ 21.807301][ T69] ? net_generic+0xb1/0x1f0
[ 21.807315][ T69] ops_undo_list+0x714/0x890
[ 21.807323][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.807329][ T69] ? cleanup_net+0x2d6/0x8b0
[ 21.807340][ T69] cleanup_net+0x3b2/0x8b0
[ 21.807347][ T69] ? net_passive_dec+0x190/0x190
[ 21.807355][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.807367][ T69] process_one_work+0xe35/0x1650
[ 21.807383][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.807392][ T69] ? assign_work+0x168/0x240
[ 21.807399][ T69] worker_thread+0x591/0xcf0
[ 21.807410][ T69] ? rescuer_thread+0xd10/0xd10
[ 21.807417][ T69] kthread+0x37b/0x5f0
[ 21.807423][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.807426][ T69] ? ret_from_fork+0x1b/0x270
[ 21.807432][ T69] ? __lock_release+0x5d/0x170
[ 21.807437][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.807441][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.807445][ T69] ret_from_fork+0x1db/0x270
[ 21.807447][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.807450][ T69] ret_from_fork_asm+0x11/0x20
[ 21.807462][ T69]
[ 21.807463][ T69]
[ 21.814852][ T69] Allocated by task 258:
[ 21.814979][ T69] kasan_save_stack+0x24/0x40
[ 21.815151][ T69] kasan_save_track+0x14/0x30
[ 21.815324][ T69] __kasan_kmalloc+0x7b/0x90
[ 21.815558][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 21.815722][ T69] alloc_netdev_mqs+0x7d/0x1370
[ 21.815898][ T69] ip6_tnl_init_net+0x102/0x3f0
[ 21.816063][ T69] ops_init+0x189/0x550
[ 21.816194][ T69] setup_net+0xf1/0x380
[ 21.816345][ T69] copy_net_ns+0x253/0x510
[ 21.816508][ T69] create_new_namespaces+0x35f/0x900
[ 21.816669][ T69] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 21.816834][ T69] ksys_unshare+0x2be/0x6e0
[ 21.816991][ T69] __x64_sys_unshare+0x31/0x40
[ 21.817146][ T69] do_syscall_64+0xc1/0xfd0
[ 21.817307][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.817511][ T69]
[ 21.817596][ T69] Freed by task 69:
[ 21.817714][ T69] kasan_save_stack+0x24/0x40
[ 21.817951][ T69] kasan_save_track+0x14/0x30
[ 21.818143][ T69] __kasan_save_free_info+0x3b/0x60
[ 21.818301][ T69] __kasan_slab_free+0x3f/0x60
[ 21.818463][ T69] kfree+0x21d/0x540
[ 21.818583][ T69] device_release+0x9c/0x210
[ 21.818738][ T69] kobject_cleanup+0xfe/0x360
[ 21.818915][ T69] netdev_run_todo+0x81f/0xc60
[ 21.819076][ T69] ops_undo_list+0x714/0x890
[ 21.819233][ T69] cleanup_net+0x3b2/0x8b0
[ 21.819389][ T69] process_one_work+0xe35/0x1650
[ 21.819555][ T69] worker_thread+0x591/0xcf0
[ 21.819715][ T69] kthread+0x37b/0x5f0
[ 21.819846][ T69] ret_from_fork+0x1db/0x270
[ 21.820013][ T69] ret_from_fork_asm+0x11/0x20
[ 21.820178][ T69]
[ 21.820259][ T69] The buggy address belongs to the object at ffff888005b71000
[ 21.820259][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 21.820656][ T69] The buggy address is located 1732 bytes inside of
[ 21.820656][ T69] freed 4096-byte region [ffff888005b71000, ffff888005b72000)
[ 21.821115][ T69]
[ 21.821196][ T69] The buggy address belongs to the physical page:
[ 21.821385][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b70
[ 21.821706][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 21.821965][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 21.822218][ T69] page_type: f5(slab)
[ 21.822341][ T69] raw: 0080000000000040 ffff888001043700 ffffea0000133210 ffffea00001dc810
[ 21.822623][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.822984][ T69] head: 0080000000000040 ffff888001043700 ffffea0000133210 ffffea00001dc810
[ 21.823458][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.823755][ T69] head: 0080000000000003 ffffea000016dc01 00000000ffffffff 00000000ffffffff
[ 21.824103][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.824387][ T69] page dumped because: kasan: bad access detected
[ 21.824613][ T69]
[ 21.824695][ T69] Memory state around the buggy address:
[ 21.824859][ T69] ffff888005b71580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.825093][ T69] ffff888005b71600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.825336][ T69] >ffff888005b71680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.825662][ T69] ^
[ 21.825896][ T69] ffff888005b71700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.826121][ T69] ffff888005b71780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.826381][ T69] ==================================================================
[ 21.826824][ T69] Disabling lock debugging due to kernel taint
[ 21.827123][ T69] ------------[ cut here ]------------
[ 21.827326][ T69] refcount_t: underflow; use-after-free.
[ 21.827560][ T69] WARNING: CPU: 0 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.828034][ T69] Modules linked in:
[ 21.828270][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.828879][ T69] Tainted: [B]=BAD_PAGE
[ 21.829099][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.829464][ T69] Workqueue: netns cleanup_net
[ 21.829759][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.830115][ T69] 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 97 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
[ 21.831104][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 21.831472][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.831884][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.832310][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3000934
[ 21.832725][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 21.833150][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.833570][ T69] FS: 0000000000000000(0000) GS:ffff8880d3b08000(0000) knlGS:0000000000000000
[ 21.834052][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.834429][ T69] CR2: 000055f223b490f8 CR3: 0000000030b49002 CR4: 0000000000772ef0
[ 21.834840][ T69] PKRU: 55555554
[ 21.835053][ T69] Call Trace:
[ 21.835271][ T69]
[ 21.835416][ T69] netdev_run_todo+0x5f0/0xc60
[ 21.835707][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 21.836024][ T69] ? generic_xdp_install+0x410/0x410
[ 21.836325][ T69] ? net_generic+0xb1/0x1f0
[ 21.836617][ T69] ops_undo_list+0x714/0x890
[ 21.836895][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.837172][ T69] ? cleanup_net+0x2d6/0x8b0
[ 21.837487][ T69] cleanup_net+0x3b2/0x8b0
[ 21.837766][ T69] ? net_passive_dec+0x190/0x190
[ 21.838046][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.838353][ T69] process_one_work+0xe35/0x1650
[ 21.838657][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.838939][ T69] ? assign_work+0x168/0x240
[ 21.839231][ T69] worker_thread+0x591/0xcf0
[ 21.839507][ T69] ? rescuer_thread+0xd10/0xd10
[ 21.839787][ T69] kthread+0x37b/0x5f0
[ 21.839997][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.840286][ T69] ? ret_from_fork+0x1b/0x270
[ 21.840564][ T69] ? __lock_release+0x5d/0x170
[ 21.840853][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.841133][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.841423][ T69] ret_from_fork+0x1db/0x270
[ 21.841696][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.841969][ T69] ret_from_fork_asm+0x11/0x20
[ 21.842264][ T69]
[ 21.842468][ T69] irq event stamp: 13555
[ 21.842675][ T69] hardirqs last enabled at (13555): [] finish_task_switch.isra.0+0x245/0x960
[ 21.843256][ T69] hardirqs last disabled at (13554): [] __schedule+0x94a/0x1b10
[ 21.843739][ T69] softirqs last enabled at (12754): [] handle_softirqs+0x352/0x610
[ 21.844225][ T69] softirqs last disabled at (12745): [] irq_exit_rcu+0xab/0x100
[ 21.844702][ T69] ---[ end trace 0000000000000000 ]---