[ 17.854359][ T261] ip (261) used greatest stack depth: 23552 bytes left
[ 39.891274][ T71] ==================================================================
[ 39.891584][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 39.891853][ T71] Read of size 1 at addr ffff888009dc16ac by task kworker/u16:1/71
[ 39.892106][ T71]
[ 39.892195][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 39.892200][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 39.892203][ T71] Workqueue: netns cleanup_net
[ 39.892208][ T71] Call Trace:
[ 39.892210][ T71]
[ 39.892213][ T71] dump_stack_lvl+0x82/0xc0
[ 39.892219][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 39.892225][ T71] ? kobject_put+0xbb/0xd0
[ 39.892230][ T71] print_report+0xb4/0x270
[ 39.892233][ T71] ? kobject_put+0xbb/0xd0
[ 39.892236][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 39.892240][ T71] ? kobject_put+0xbb/0xd0
[ 39.892243][ T71] kasan_report+0xca/0x100
[ 39.892247][ T71] ? kobject_put+0xbb/0xd0
[ 39.892253][ T71] kobject_put+0xbb/0xd0
[ 39.892257][ T71] netdev_run_todo+0x5f0/0xc60
[ 39.892262][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 39.892266][ T71] ? generic_xdp_install+0x410/0x410
[ 39.892272][ T71] ops_undo_list+0x714/0x890
[ 39.892279][ T71] ? netns_get+0x110/0x110
[ 39.892283][ T71] ? cleanup_net+0x2d6/0x830
[ 39.892288][ T71] cleanup_net+0x3b2/0x830
[ 39.892291][ T71] ? net_passive_dec+0x190/0x190
[ 39.892295][ T71] ? rcu_is_watching+0x12/0xb0
[ 39.892301][ T71] process_one_work+0xe35/0x1650
[ 39.892309][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 39.892315][ T71] ? assign_work+0x168/0x240
[ 39.892319][ T71] worker_thread+0x591/0xcf0
[ 39.892324][ T71] ? rescuer_thread+0xd10/0xd10
[ 39.892328][ T71] kthread+0x37b/0x5f0
[ 39.892332][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.892334][ T71] ? ret_from_fork+0x1b/0x270
[ 39.892340][ T71] ? __lock_release+0x5d/0x170
[ 39.892347][ T71] ? rcu_is_watching+0x12/0xb0
[ 39.892352][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.892357][ T71] ret_from_fork+0x1db/0x270
[ 39.892362][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.892366][ T71] ret_from_fork_asm+0x11/0x20
[ 39.892376][ T71]
[ 39.892377][ T71]
[ 39.898997][ T71] Allocated by task 255:
[ 39.899134][ T71] kasan_save_stack+0x24/0x40
[ 39.899312][ T71] kasan_save_track+0x14/0x30
[ 39.899495][ T71] __kasan_kmalloc+0x7b/0x90
[ 39.899682][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 39.899859][ T71] alloc_netdev_mqs+0x7d/0x1370
[ 39.900038][ T71] sit_init_net+0x169/0x550
[ 39.900215][ T71] ops_init+0x189/0x550
[ 39.900354][ T71] setup_net+0xf1/0x380
[ 39.900497][ T71] copy_net_ns+0x21a/0x380
[ 39.900686][ T71] create_new_namespaces+0x35f/0x900
[ 39.900863][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 39.901035][ T71] ksys_unshare+0x2a3/0x660
[ 39.901208][ T71] __x64_sys_unshare+0x31/0x40
[ 39.901392][ T71] do_syscall_64+0xc1/0xfd0
[ 39.901575][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 39.901799][ T71]
[ 39.901889][ T71] Freed by task 71:
[ 39.902020][ T71] kasan_save_stack+0x24/0x40
[ 39.902202][ T71] kasan_save_track+0x14/0x30
[ 39.902392][ T71] __kasan_save_free_info+0x3b/0x60
[ 39.902573][ T71] __kasan_slab_free+0x3f/0x60
[ 39.902750][ T71] kfree+0x21d/0x540
[ 39.902881][ T71] device_release+0x9c/0x210
[ 39.903058][ T71] kobject_cleanup+0xfe/0x360
[ 39.903232][ T71] netdev_run_todo+0x81f/0xc60
[ 39.903413][ T71] ops_undo_list+0x714/0x890
[ 39.903599][ T71] cleanup_net+0x3b2/0x830
[ 39.903770][ T71] process_one_work+0xe35/0x1650
[ 39.903948][ T71] worker_thread+0x591/0xcf0
[ 39.904118][ T71] kthread+0x37b/0x5f0
[ 39.904249][ T71] ret_from_fork+0x1db/0x270
[ 39.904446][ T71] ret_from_fork_asm+0x11/0x20
[ 39.904630][ T71]
[ 39.904720][ T71] The buggy address belongs to the object at ffff888009dc1000
[ 39.904720][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 39.905142][ T71] The buggy address is located 1708 bytes inside of
[ 39.905142][ T71] freed 4096-byte region [ffff888009dc1000, ffff888009dc2000)
[ 39.905595][ T71]
[ 39.905684][ T71] The buggy address belongs to the physical page:
[ 39.905895][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9dc0
[ 39.906213][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 39.906490][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 39.906724][ T71] page_type: f5(slab)
[ 39.906864][ T71] raw: 0080000000000040 ffff888001043700 ffffea0000149c10 ffffea0000180c10
[ 39.907172][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 39.907486][ T71] head: 0080000000000040 ffff888001043700 ffffea0000149c10 ffffea0000180c10
[ 39.907803][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 39.908112][ T71] head: 0080000000000003 ffffea0000277001 00000000ffffffff 00000000ffffffff
[ 39.908421][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 39.908735][ T71] page dumped because: kasan: bad access detected
[ 39.908951][ T71]
[ 39.909036][ T71] Memory state around the buggy address:
[ 39.909204][ T71] ffff888009dc1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 39.909472][ T71] ffff888009dc1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 39.909728][ T71] >ffff888009dc1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 39.909978][ T71] ^
[ 39.910146][ T71] ffff888009dc1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 39.910411][ T71] ffff888009dc1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 39.910665][ T71] ==================================================================
[ 39.911365][ T71] Disabling lock debugging due to kernel taint
[ 39.911591][ T71] ------------[ cut here ]------------
[ 39.911755][ T71] refcount_t: underflow; use-after-free.
[ 39.911946][ T71] WARNING: CPU: 0 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 39.912265][ T71] Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib ip6t_rpfilter ipt_rpfilter xt_tcpudp nft_compat nf_tables x_tables dummy veth
[ 39.912762][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 39.913158][ T71] Tainted: [B]=BAD_PAGE
[ 39.913292][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 39.913517][ T71] Workqueue: netns cleanup_net
[ 39.913705][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 39.913925][ T71] 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 b0 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
[ 39.914568][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 39.914786][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 39.915138][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 39.915404][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff61fe220
[ 39.915756][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 39.916012][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 39.916280][ T71] FS: 0000000000000000(0000) GS:ffff888083dec000(0000) knlGS:0000000000000000
[ 39.916677][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 39.916889][ T71] CR2: 000055e6c1a30588 CR3: 0000000005134003 CR4: 0000000000772ef0
[ 39.917245][ T71] PKRU: 55555554
[ 39.917464][ T71] Call Trace:
[ 39.917602][ T71]
[ 39.917696][ T71] netdev_run_todo+0x5f0/0xc60
[ 39.917955][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 39.918141][ T71] ? generic_xdp_install+0x410/0x410
[ 39.918315][ T71] ops_undo_list+0x714/0x890
[ 39.918498][ T71] ? netns_get+0x110/0x110
[ 39.918679][ T71] ? cleanup_net+0x2d6/0x830
[ 39.918853][ T71] cleanup_net+0x3b2/0x830
[ 39.919020][ T71] ? net_passive_dec+0x190/0x190
[ 39.919202][ T71] ? rcu_is_watching+0x12/0xb0
[ 39.919380][ T71] process_one_work+0xe35/0x1650
[ 39.919557][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 39.919730][ T71] ? assign_work+0x168/0x240
[ 39.919897][ T71] worker_thread+0x591/0xcf0
[ 39.920165][ T71] ? rescuer_thread+0xd10/0xd10
[ 39.920331][ T71] kthread+0x37b/0x5f0
[ 39.920559][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.920812][ T71] ? ret_from_fork+0x1b/0x270
[ 39.920978][ T71] ? __lock_release+0x5d/0x170
[ 39.921152][ T71] ? rcu_is_watching+0x12/0xb0
[ 39.921315][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.921586][ T71] ret_from_fork+0x1db/0x270
[ 39.921758][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 39.921927][ T71] ret_from_fork_asm+0x11/0x20
[ 39.922098][ T71]
[ 39.922325][ T71] irq event stamp: 7647
[ 39.922457][ T71] hardirqs last enabled at (7647): [] irqentry_exit+0x3b/0x80
[ 39.922761][ T71] hardirqs last disabled at (7646): [] handle_softirqs+0x47f/0x610
[ 39.923145][ T71] softirqs last enabled at (6848): [] handle_softirqs+0x352/0x610
[ 39.923447][ T71] softirqs last disabled at (6841): [] irq_exit_rcu+0xab/0x100
[ 39.923749][ T71] ---[ end trace 0000000000000000 ]---