[ 22.388436][ T250] sctp: Hash tables configured (bind 32/56)
[ 62.618204][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 63.164384][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 63.787493][ C2] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 126.202246][ T12] ==================================================================
[ 126.202710][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 126.203126][ T12] Read of size 1 at addr ffff888007cac6ac by task kworker/u16:0/12
[ 126.203533][ T12]
[ 126.203677][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 126.203685][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 126.203689][ T12] Workqueue: netns cleanup_net
[ 126.203701][ T12] Call Trace:
[ 126.203704][ T12]
[ 126.203709][ T12] dump_stack_lvl+0x82/0xc0
[ 126.203721][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 126.203734][ T12] ? kobject_put+0xbb/0xd0
[ 126.203740][ T12] print_report+0xb4/0x270
[ 126.203746][ T12] ? kobject_put+0xbb/0xd0
[ 126.203751][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 126.203757][ T12] ? kobject_put+0xbb/0xd0
[ 126.203762][ T12] kasan_report+0xca/0x100
[ 126.203769][ T12] ? kobject_put+0xbb/0xd0
[ 126.203779][ T12] kobject_put+0xbb/0xd0
[ 126.203786][ T12] netdev_run_todo+0x5f0/0xc60
[ 126.203794][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 126.203799][ T12] ? generic_xdp_install+0x410/0x410
[ 126.203812][ T12] ops_undo_list+0x714/0x890
[ 126.203823][ T12] ? netns_get+0x110/0x110
[ 126.203829][ T12] ? cleanup_net+0x2d6/0x830
[ 126.203839][ T12] cleanup_net+0x3b2/0x830
[ 126.203845][ T12] ? net_passive_dec+0x190/0x190
[ 126.203852][ T12] ? rcu_is_watching+0x12/0xb0
[ 126.203864][ T12] process_one_work+0xe35/0x1650
[ 126.203879][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 126.203889][ T12] ? assign_work+0x168/0x240
[ 126.203897][ T12] worker_thread+0x591/0xcf0
[ 126.203907][ T12] ? rescuer_thread+0xd10/0xd10
[ 126.203913][ T12] kthread+0x37b/0x5f0
[ 126.203920][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.203925][ T12] ? ret_from_fork+0x1b/0x270
[ 126.203934][ T12] ? __lock_release+0x5d/0x170
[ 126.203942][ T12] ? rcu_is_watching+0x12/0xb0
[ 126.203947][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.203953][ T12] ret_from_fork+0x1db/0x270
[ 126.203958][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.203963][ T12] ret_from_fork_asm+0x11/0x20
[ 126.203982][ T12]
[ 126.203984][ T12]
[ 126.214444][ T12] Allocated by task 255:
[ 126.214647][ T12] kasan_save_stack+0x24/0x40
[ 126.214925][ T12] kasan_save_track+0x14/0x30
[ 126.215197][ T12] __kasan_kmalloc+0x7b/0x90
[ 126.215472][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 126.215756][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 126.216034][ T12] sit_init_net+0x169/0x550
[ 126.216310][ T12] ops_init+0x189/0x550
[ 126.216519][ T12] setup_net+0xf1/0x380
[ 126.216729][ T12] copy_net_ns+0x21a/0x380
[ 126.216985][ T12] create_new_namespaces+0x35f/0x900
[ 126.217272][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 126.217545][ T12] ksys_unshare+0x2a3/0x660
[ 126.217823][ T12] __x64_sys_unshare+0x31/0x40
[ 126.218140][ T12] do_syscall_64+0xc1/0xfd0
[ 126.218416][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 126.218710][ T12]
[ 126.218861][ T12] Freed by task 12:
[ 126.219090][ T12] kasan_save_stack+0x24/0x40
[ 126.219358][ T12] kasan_save_track+0x14/0x30
[ 126.219621][ T12] __kasan_save_free_info+0x3b/0x60
[ 126.219897][ T12] __kasan_slab_free+0x3f/0x60
[ 126.220165][ T12] kfree+0x21d/0x540
[ 126.220372][ T12] device_release+0x9c/0x210
[ 126.220638][ T12] kobject_cleanup+0xfe/0x360
[ 126.220895][ T12] netdev_run_todo+0x81f/0xc60
[ 126.221167][ T12] ops_undo_list+0x714/0x890
[ 126.221429][ T12] cleanup_net+0x3b2/0x830
[ 126.221678][ T12] process_one_work+0xe35/0x1650
[ 126.221970][ T12] worker_thread+0x591/0xcf0
[ 126.222210][ T12] kthread+0x37b/0x5f0
[ 126.222410][ T12] ret_from_fork+0x1db/0x270
[ 126.222698][ T12] ret_from_fork_asm+0x11/0x20
[ 126.222969][ T12]
[ 126.223098][ T12] The buggy address belongs to the object at ffff888007cac000
[ 126.223098][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 126.223749][ T12] The buggy address is located 1708 bytes inside of
[ 126.223749][ T12] freed 4096-byte region [ffff888007cac000, ffff888007cad000)
[ 126.224454][ T12]
[ 126.224581][ T12] The buggy address belongs to the physical page:
[ 126.224916][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ca8
[ 126.225401][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 126.225819][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 126.226178][ T12] page_type: f5(slab)
[ 126.226389][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001f2210 ffffea00001d6c10
[ 126.226911][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 126.227393][ T12] head: 0080000000000040 ffff888001043700 ffffea00001f2210 ffffea00001d6c10
[ 126.227911][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 126.228393][ T12] head: 0080000000000003 ffffea00001f2a01 00000000ffffffff 00000000ffffffff
[ 126.228887][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 126.229373][ T12] page dumped because: kasan: bad access detected
[ 126.229713][ T12]
[ 126.229844][ T12] Memory state around the buggy address:
[ 126.230129][ T12] ffff888007cac580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.230488][ T12] ffff888007cac600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.230885][ T12] >ffff888007cac680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.231262][ T12] ^
[ 126.231487][ T12] ffff888007cac700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.231838][ T12] ffff888007cac780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 126.232201][ T12] ==================================================================
[ 126.232865][ T12] Disabling lock debugging due to kernel taint
[ 126.233199][ T12] ------------[ cut here ]------------
[ 126.233451][ T12] refcount_t: underflow; use-after-free.
[ 126.233758][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 126.234238][ T12] Modules linked in: nf_conntrack_netlink nft_nat nft_numgen nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 sctp_diag nft_limit tcp_diag inet_diag nfnetlink_queue nft_queue nf_tables veth sctp ip6_udp_tunnel udp_tunnel
[ 126.235420][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 126.236016][ T12] Tainted: [B]=BAD_PAGE
[ 126.236226][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 126.236553][ T12] Workqueue: netns cleanup_net
[ 126.236846][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 126.237188][ T12] 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 45 91 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
[ 126.238143][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 126.238491][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 126.238905][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 126.239280][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff23be220
[ 126.239666][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 126.240076][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 126.240517][ T12] FS: 0000000000000000(0000) GS:ffff8880a2fec000(0000) knlGS:0000000000000000
[ 126.240988][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 126.241329][ T12] CR2: 00007f41408f1444 CR3: 000000002f935003 CR4: 0000000000772ef0
[ 126.241720][ T12] PKRU: 55555554
[ 126.241905][ T12] Call Trace:
[ 126.242090][ T12]
[ 126.242220][ T12] netdev_run_todo+0x5f0/0xc60
[ 126.242473][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 126.242734][ T12] ? generic_xdp_install+0x410/0x410
[ 126.242974][ T12] ops_undo_list+0x714/0x890
[ 126.243236][ T12] ? netns_get+0x110/0x110
[ 126.243510][ T12] ? cleanup_net+0x2d6/0x830
[ 126.243790][ T12] cleanup_net+0x3b2/0x830
[ 126.244058][ T12] ? net_passive_dec+0x190/0x190
[ 126.244323][ T12] ? rcu_is_watching+0x12/0xb0
[ 126.244588][ T12] process_one_work+0xe35/0x1650
[ 126.244866][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 126.245122][ T12] ? assign_work+0x168/0x240
[ 126.245375][ T12] worker_thread+0x591/0xcf0
[ 126.245648][ T12] ? rescuer_thread+0xd10/0xd10
[ 126.245921][ T12] kthread+0x37b/0x5f0
[ 126.246109][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.246344][ T12] ? ret_from_fork+0x1b/0x270
[ 126.246610][ T12] ? __lock_release+0x5d/0x170
[ 126.246892][ T12] ? rcu_is_watching+0x12/0xb0
[ 126.247157][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.247418][ T12] ret_from_fork+0x1db/0x270
[ 126.247684][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 126.247967][ T12] ret_from_fork_asm+0x11/0x20
[ 126.248237][ T12]
[ 126.248456][ T12] irq event stamp: 9083
[ 126.248657][ T12] hardirqs last enabled at (9083): [] irqentry_exit+0x3b/0x80
[ 126.249143][ T12] hardirqs last disabled at (9082): [] handle_softirqs+0x47f/0x610
[ 126.249639][ T12] softirqs last enabled at (8006): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 126.250395][ T12] softirqs last disabled at (8004): [] dev_mc_flush+0x54/0x90
[ 126.250861][ T12] ---[ end trace 0000000000000000 ]---