[ 30.483953][ T70] ==================================================================
[ 30.484313][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 30.484627][ T70] Read of size 1 at addr ffff888008d9c6ac by task kworker/u16:1/70
[ 30.484905][ T70]
[ 30.485010][ T70] CPU: 1 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.485019][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.485023][ T70] Workqueue: netns cleanup_net
[ 30.485037][ T70] Call Trace:
[ 30.485041][ T70]
[ 30.485044][ T70] dump_stack_lvl+0x82/0xc0
[ 30.485052][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 30.485064][ T70] ? kobject_put+0xbb/0xd0
[ 30.485068][ T70] print_report+0xb4/0x270
[ 30.485072][ T70] ? kobject_put+0xbb/0xd0
[ 30.485075][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 30.485079][ T70] ? kobject_put+0xbb/0xd0
[ 30.485082][ T70] kasan_report+0xca/0x100
[ 30.485087][ T70] ? kobject_put+0xbb/0xd0
[ 30.485092][ T70] kobject_put+0xbb/0xd0
[ 30.485096][ T70] netdev_run_todo+0x5f0/0xc60
[ 30.485103][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 30.485107][ T70] ? generic_xdp_install+0x410/0x410
[ 30.485114][ T70] ops_undo_list+0x714/0x890
[ 30.485123][ T70] ? netns_get+0x110/0x110
[ 30.485126][ T70] ? cleanup_net+0x2d6/0x830
[ 30.485131][ T70] cleanup_net+0x3b2/0x830
[ 30.485134][ T70] ? net_passive_dec+0x190/0x190
[ 30.485138][ T70] ? rcu_is_watching+0x12/0xb0
[ 30.485147][ T70] process_one_work+0xe35/0x1650
[ 30.485158][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.485163][ T70] ? assign_work+0x168/0x240
[ 30.485167][ T70] worker_thread+0x591/0xcf0
[ 30.485173][ T70] ? rescuer_thread+0xd10/0xd10
[ 30.485176][ T70] kthread+0x37b/0x5f0
[ 30.485182][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.485184][ T70] ? ret_from_fork+0x1b/0x270
[ 30.485196][ T70] ? __lock_release+0x5d/0x170
[ 30.485205][ T70] ? rcu_is_watching+0x12/0xb0
[ 30.485208][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.485211][ T70] ret_from_fork+0x1db/0x270
[ 30.485214][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.485217][ T70] ret_from_fork_asm+0x11/0x20
[ 30.485230][ T70]
[ 30.485231][ T70]
[ 30.492584][ T70] Allocated by task 252:
[ 30.492727][ T70] kasan_save_stack+0x24/0x40
[ 30.493011][ T70] kasan_save_track+0x14/0x30
[ 30.493197][ T70] __kasan_kmalloc+0x7b/0x90
[ 30.493390][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 30.493587][ T70] alloc_netdev_mqs+0x7d/0x1370
[ 30.493783][ T70] sit_init_net+0x169/0x550
[ 30.493977][ T70] ops_init+0x189/0x550
[ 30.494117][ T70] setup_net+0xf1/0x380
[ 30.494265][ T70] copy_net_ns+0x21a/0x380
[ 30.494456][ T70] create_new_namespaces+0x35f/0x900
[ 30.494731][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 30.494915][ T70] ksys_unshare+0x2a3/0x660
[ 30.495109][ T70] __x64_sys_unshare+0x31/0x40
[ 30.495300][ T70] do_syscall_64+0xc1/0xfd0
[ 30.495575][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 30.495803][ T70]
[ 30.495895][ T70] Freed by task 70:
[ 30.496031][ T70] kasan_save_stack+0x24/0x40
[ 30.496329][ T70] kasan_save_track+0x14/0x30
[ 30.496519][ T70] __kasan_save_free_info+0x3b/0x60
[ 30.496726][ T70] __kasan_slab_free+0x3f/0x60
[ 30.496909][ T70] kfree+0x21d/0x540
[ 30.497138][ T70] device_release+0x9c/0x210
[ 30.497337][ T70] kobject_cleanup+0xfe/0x360
[ 30.497526][ T70] netdev_run_todo+0x81f/0xc60
[ 30.497716][ T70] ops_undo_list+0x714/0x890
[ 30.497993][ T70] cleanup_net+0x3b2/0x830
[ 30.498170][ T70] process_one_work+0xe35/0x1650
[ 30.498365][ T70] worker_thread+0x591/0xcf0
[ 30.498549][ T70] kthread+0x37b/0x5f0
[ 30.498692][ T70] ret_from_fork+0x1db/0x270
[ 30.498961][ T70] ret_from_fork_asm+0x11/0x20
[ 30.499143][ T70]
[ 30.499236][ T70] The buggy address belongs to the object at ffff888008d9c000
[ 30.499236][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 30.499782][ T70] The buggy address is located 1708 bytes inside of
[ 30.499782][ T70] freed 4096-byte region [ffff888008d9c000, ffff888008d9d000)
[ 30.500229][ T70]
[ 30.500322][ T70] The buggy address belongs to the physical page:
[ 30.500643][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d98
[ 30.500972][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 30.501355][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 30.501607][ T70] page_type: f5(slab)
[ 30.501743][ T70] raw: 0080000000000040 ffff888001043700 ffffea00001ec210 ffffea00001d5010
[ 30.502164][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.502497][ T70] head: 0080000000000040 ffff888001043700 ffffea00001ec210 ffffea00001d5010
[ 30.502830][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.503246][ T70] head: 0080000000000003 ffffea0000236601 00000000ffffffff 00000000ffffffff
[ 30.503575][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 30.503992][ T70] page dumped because: kasan: bad access detected
[ 30.504226][ T70]
[ 30.504325][ T70] Memory state around the buggy address:
[ 30.504503][ T70] ffff888008d9c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.504855][ T70] ffff888008d9c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.505121][ T70] >ffff888008d9c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.505490][ T70] ^
[ 30.505668][ T70] ffff888008d9c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.505934][ T70] ffff888008d9c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.506291][ T70] ==================================================================
[ 30.506686][ T70] Disabling lock debugging due to kernel taint
[ 30.507009][ T70] ------------[ cut here ]------------
[ 30.507179][ T70] refcount_t: underflow; use-after-free.
[ 30.507416][ T70] WARNING: CPU: 3 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 30.507827][ T70] Modules linked in: nf_conntrack_netlink tcp_diag inet_diag nf_conntrack_ftp nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 30.508303][ T70] CPU: 3 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.508699][ T70] Tainted: [B]=BAD_PAGE
[ 30.508824][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.509025][ T70] Workqueue: netns cleanup_net
[ 30.509196][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 30.509407][ T70] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de a5 96 e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 30.510109][ T70] RSP: 0000:ffffc900004b7a08 EFLAGS: 00010282
[ 30.510443][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 30.510823][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 30.511200][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2e7e220
[ 30.511575][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 30.511959][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 30.512348][ T70] FS: 0000000000000000(0000) GS:ffff88809db6c000(0000) knlGS:0000000000000000
[ 30.512811][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 30.513136][ T70] CR2: 00007fdb68d5f49c CR3: 0000000028735004 CR4: 0000000000772ef0
[ 30.513517][ T70] PKRU: 55555554
[ 30.513721][ T70] Call Trace:
[ 30.513921][ T70]
[ 30.514054][ T70] netdev_run_todo+0x5f0/0xc60
[ 30.514321][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 30.514569][ T70] ? generic_xdp_install+0x410/0x410
[ 30.514835][ T70] ops_undo_list+0x714/0x890
[ 30.515084][ T70] ? netns_get+0x110/0x110
[ 30.515466][ T70] ? cleanup_net+0x2d6/0x830
[ 30.515716][ T70] cleanup_net+0x3b2/0x830
[ 30.515972][ T70] ? net_passive_dec+0x190/0x190
[ 30.516223][ T70] ? rcu_is_watching+0x12/0xb0
[ 30.516666][ T70] process_one_work+0xe35/0x1650
[ 30.516933][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.517184][ T70] ? assign_work+0x168/0x240
[ 30.517439][ T70] worker_thread+0x591/0xcf0
[ 30.517697][ T70] ? rescuer_thread+0xd10/0xd10
[ 30.517947][ T70] kthread+0x37b/0x5f0
[ 30.518138][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.518389][ T70] ? ret_from_fork+0x1b/0x270
[ 30.518656][ T70] ? __lock_release+0x5d/0x170
[ 30.518914][ T70] ? rcu_is_watching+0x12/0xb0
[ 30.519167][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.519390][ T70] ret_from_fork+0x1db/0x270
[ 30.519595][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.519844][ T70] ret_from_fork_asm+0x11/0x20
[ 30.520083][ T70]
[ 30.520268][ T70] irq event stamp: 4971
[ 30.520459][ T70] hardirqs last enabled at (4971): [] finish_task_switch.isra.0+0x245/0x960
[ 30.520992][ T70] hardirqs last disabled at (4970): [] __schedule+0x94a/0x1b10
[ 30.521447][ T70] softirqs last enabled at (4888): [] handle_softirqs+0x352/0x610
[ 30.521885][ T70] softirqs last disabled at (4881): [] irq_exit_rcu+0xab/0x100
[ 30.522332][ T70] ---[ end trace 0000000000000000 ]---