[ 16.804065][ T250] sctp: Hash tables configured (bind 32/56)
[ 17.945434][ T260] ip (260) used greatest stack depth: 23440 bytes left
[ 51.048788][ C3] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 51.595662][ C2] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 51.764322][ C2] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 52.375936][ C2] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 52.654272][ C2] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 52.934625][ C0] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies.
[ 98.791551][ T12] ==================================================================
[ 98.791890][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 98.792198][ T12] Read of size 1 at addr ffff888006f916ac by task kworker/u16:0/12
[ 98.792463][ T12]
[ 98.792565][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 98.792576][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 98.792581][ T12] Workqueue: netns cleanup_net
[ 98.792593][ T12] Call Trace:
[ 98.792596][ T12]
[ 98.792600][ T12] dump_stack_lvl+0x82/0xc0
[ 98.792608][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 98.792626][ T12] ? kobject_put+0xbb/0xd0
[ 98.792630][ T12] print_report+0xb4/0x270
[ 98.792634][ T12] ? kobject_put+0xbb/0xd0
[ 98.792637][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 98.792641][ T12] ? kobject_put+0xbb/0xd0
[ 98.792644][ T12] kasan_report+0xca/0x100
[ 98.792649][ T12] ? kobject_put+0xbb/0xd0
[ 98.792655][ T12] kobject_put+0xbb/0xd0
[ 98.792658][ T12] netdev_run_todo+0x5f0/0xc60
[ 98.792666][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 98.792670][ T12] ? generic_xdp_install+0x410/0x410
[ 98.792677][ T12] ops_undo_list+0x714/0x890
[ 98.792687][ T12] ? netns_get+0x110/0x110
[ 98.792690][ T12] ? cleanup_net+0x2d6/0x830
[ 98.792695][ T12] cleanup_net+0x3b2/0x830
[ 98.792698][ T12] ? net_passive_dec+0x190/0x190
[ 98.792702][ T12] ? rcu_is_watching+0x12/0xb0
[ 98.792712][ T12] process_one_work+0xe35/0x1650
[ 98.792727][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 98.792733][ T12] ? assign_work+0x168/0x240
[ 98.792737][ T12] worker_thread+0x591/0xcf0
[ 98.792742][ T12] ? rescuer_thread+0xd10/0xd10
[ 98.792746][ T12] kthread+0x37b/0x5f0
[ 98.792752][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 98.792755][ T12] ? ret_from_fork+0x1b/0x270
[ 98.792769][ T12] ? __lock_release+0x5d/0x170
[ 98.792781][ T12] ? rcu_is_watching+0x12/0xb0
[ 98.792784][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 98.792787][ T12] ret_from_fork+0x1db/0x270
[ 98.792792][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 98.792798][ T12] ret_from_fork_asm+0x11/0x20
[ 98.792815][ T12]
[ 98.792817][ T12]
[ 98.799607][ T12] Allocated by task 254:
[ 98.799743][ T12] kasan_save_stack+0x24/0x40
[ 98.799939][ T12] kasan_save_track+0x14/0x30
[ 98.800117][ T12] __kasan_kmalloc+0x7b/0x90
[ 98.800290][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 98.800480][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 98.800665][ T12] sit_init_net+0x169/0x550
[ 98.800852][ T12] ops_init+0x189/0x550
[ 98.800985][ T12] setup_net+0xf1/0x380
[ 98.801116][ T12] copy_net_ns+0x21a/0x380
[ 98.801388][ T12] create_new_namespaces+0x35f/0x900
[ 98.801567][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 98.801748][ T12] ksys_unshare+0x2a3/0x660
[ 98.801941][ T12] __x64_sys_unshare+0x31/0x40
[ 98.802205][ T12] do_syscall_64+0xc1/0xfd0
[ 98.802383][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 98.802614][ T12]
[ 98.802704][ T12] Freed by task 12:
[ 98.802850][ T12] kasan_save_stack+0x24/0x40
[ 98.803124][ T12] kasan_save_track+0x14/0x30
[ 98.803303][ T12] __kasan_save_free_info+0x3b/0x60
[ 98.803471][ T12] __kasan_slab_free+0x3f/0x60
[ 98.803655][ T12] kfree+0x21d/0x540
[ 98.803889][ T12] device_release+0x9c/0x210
[ 98.804076][ T12] kobject_cleanup+0xfe/0x360
[ 98.804250][ T12] netdev_run_todo+0x81f/0xc60
[ 98.804420][ T12] ops_undo_list+0x714/0x890
[ 98.804604][ T12] cleanup_net+0x3b2/0x830
[ 98.804782][ T12] process_one_work+0xe35/0x1650
[ 98.804969][ T12] worker_thread+0x591/0xcf0
[ 98.805141][ T12] kthread+0x37b/0x5f0
[ 98.805272][ T12] ret_from_fork+0x1db/0x270
[ 98.805447][ T12] ret_from_fork_asm+0x11/0x20
[ 98.805672][ T12]
[ 98.805795][ T12] The buggy address belongs to the object at ffff888006f91000
[ 98.805795][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 98.806359][ T12] The buggy address is located 1708 bytes inside of
[ 98.806359][ T12] freed 4096-byte region [ffff888006f91000, ffff888006f92000)
[ 98.806863][ T12]
[ 98.806954][ T12] The buggy address belongs to the physical page:
[ 98.807257][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f90
[ 98.807586][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 98.807962][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 98.808190][ T12] page_type: f5(slab)
[ 98.808326][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000147a10 ffffea00001ee610
[ 98.808633][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 98.808938][ T12] head: 0080000000000040 ffff888001043700 ffffea0000147a10 ffffea00001ee610
[ 98.809243][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 98.809541][ T12] head: 0080000000000003 ffffea00001be401 00000000ffffffff 00000000ffffffff
[ 98.809839][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 98.810240][ T12] page dumped because: kasan: bad access detected
[ 98.810453][ T12]
[ 98.810624][ T12] Memory state around the buggy address:
[ 98.810797][ T12] ffff888006f91580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 98.811048][ T12] ffff888006f91600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 98.811297][ T12] >ffff888006f91680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 98.811644][ T12] ^
[ 98.811809][ T12] ffff888006f91700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 98.812059][ T12] ffff888006f91780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 98.812471][ T12] ==================================================================
[ 98.812830][ T12] Disabling lock debugging due to kernel taint
[ 98.813127][ T12] ------------[ cut here ]------------
[ 98.813278][ T12] refcount_t: underflow; use-after-free.
[ 98.813451][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 98.814806][ 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
[ 98.815477][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 98.815893][ T12] Tainted: [B]=BAD_PAGE
[ 98.816016][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 98.816212][ T12] Workqueue: netns cleanup_net
[ 98.816377][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 98.816574][ 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 65 8b 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
[ 98.817300][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 98.817504][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 98.817948][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 98.818177][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff17fe220
[ 98.818406][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 98.818713][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 98.818947][ T12] FS: 0000000000000000(0000) GS:ffff8880a8e6c000(0000) knlGS:0000000000000000
[ 98.819211][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 98.819495][ T12] CR2: 00007fc6b9e36a20 CR3: 0000000008df9005 CR4: 0000000000772ef0
[ 98.819765][ T12] PKRU: 55555554
[ 98.819882][ T12] Call Trace:
[ 98.819999][ T12]
[ 98.820079][ T12] netdev_run_todo+0x5f0/0xc60
[ 98.820324][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 98.820475][ T12] ? generic_xdp_install+0x410/0x410
[ 98.820637][ T12] ops_undo_list+0x714/0x890
[ 98.820798][ T12] ? netns_get+0x110/0x110
[ 98.821037][ T12] ? cleanup_net+0x2d6/0x830
[ 98.821193][ T12] cleanup_net+0x3b2/0x830
[ 98.821348][ T12] ? net_passive_dec+0x190/0x190
[ 98.821502][ T12] ? rcu_is_watching+0x12/0xb0
[ 98.821762][ T12] process_one_work+0xe35/0x1650
[ 98.821922][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 98.822077][ T12] ? assign_work+0x168/0x240
[ 98.822231][ T12] worker_thread+0x591/0xcf0
[ 98.822469][ T12] ? rescuer_thread+0xd10/0xd10
[ 98.822629][ T12] kthread+0x37b/0x5f0
[ 98.822757][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 98.822910][ T12] ? ret_from_fork+0x1b/0x270
[ 98.823149][ T12] ? __lock_release+0x5d/0x170
[ 98.823304][ T12] ? rcu_is_watching+0x12/0xb0
[ 98.823454][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 98.823617][ T12] ret_from_fork+0x1db/0x270
[ 98.823861][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 98.824012][ T12] ret_from_fork_asm+0x11/0x20
[ 98.824178][ T12]
[ 98.824296][ T12] irq event stamp: 8883
[ 98.824413][ T12] hardirqs last enabled at (8883): [] finish_task_switch.isra.0+0x245/0x960
[ 98.824823][ T12] hardirqs last disabled at (8882): [] __schedule+0x94a/0x1b10
[ 98.825105][ T12] softirqs last enabled at (8384): [] handle_softirqs+0x352/0x610
[ 98.825457][ T12] softirqs last disabled at (8375): [] irq_exit_rcu+0xab/0x100
[ 98.825737][ T12] ---[ end trace 0000000000000000 ]---