[ 19.958496][ T263] ip (263) used greatest stack depth: 24688 bytes left
[ 22.689672][ T283] u32 classifier
[ 22.689936][ T283] input device check on
[ 22.690211][ T283] Actions configured
[ 22.989289][ T285] netem: version 1.3
[ 24.546981][ T290] sctp: Hash tables configured (bind 32/56)
[ 25.355874][ C0] htb: netem qdisc 10: is non-work-conserving?
[ 28.157980][ T71] ==================================================================
[ 28.158384][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 28.158751][ T71] Read of size 1 at addr ffff888007e996ac by task kworker/u16:1/71
[ 28.159135][ T71]
[ 28.159262][ T71] CPU: 1 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 28.159270][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 28.159274][ T71] Workqueue: netns cleanup_net
[ 28.159285][ T71] Call Trace:
[ 28.159289][ T71]
[ 28.159293][ T71] dump_stack_lvl+0x82/0xc0
[ 28.159309][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 28.159320][ T71] ? kobject_put+0xbb/0xd0
[ 28.159328][ T71] print_report+0xb4/0x270
[ 28.159333][ T71] ? kobject_put+0xbb/0xd0
[ 28.159338][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 28.159345][ T71] ? kobject_put+0xbb/0xd0
[ 28.159350][ T71] kasan_report+0xca/0x100
[ 28.159357][ T71] ? kobject_put+0xbb/0xd0
[ 28.159366][ T71] kobject_put+0xbb/0xd0
[ 28.159372][ T71] netdev_run_todo+0x5f0/0xc60
[ 28.159380][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 28.159387][ T71] ? generic_xdp_install+0x410/0x410
[ 28.159397][ T71] ops_undo_list+0x714/0x890
[ 28.159409][ T71] ? netns_get+0x110/0x110
[ 28.159415][ T71] ? cleanup_net+0x2d6/0x830
[ 28.159422][ T71] cleanup_net+0x3b2/0x830
[ 28.159427][ T71] ? net_passive_dec+0x190/0x190
[ 28.159433][ T71] ? rcu_is_watching+0x12/0xb0
[ 28.159442][ T71] process_one_work+0xe35/0x1650
[ 28.159453][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 28.159461][ T71] ? assign_work+0x168/0x240
[ 28.159468][ T71] worker_thread+0x591/0xcf0
[ 28.159477][ T71] ? rescuer_thread+0xd10/0xd10
[ 28.159483][ T71] kthread+0x37b/0x5f0
[ 28.159490][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.159494][ T71] ? ret_from_fork+0x1b/0x270
[ 28.159503][ T71] ? __lock_release+0x5d/0x170
[ 28.159512][ T71] ? rcu_is_watching+0x12/0xb0
[ 28.159517][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.159524][ T71] ret_from_fork+0x1db/0x270
[ 28.159529][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.159534][ T71] ret_from_fork_asm+0x11/0x20
[ 28.159546][ T71]
[ 28.159549][ T71]
[ 28.168499][ T71] Allocated by task 249:
[ 28.168681][ T71] kasan_save_stack+0x24/0x40
[ 28.168934][ T71] kasan_save_track+0x14/0x30
[ 28.169173][ T71] __kasan_kmalloc+0x7b/0x90
[ 28.169404][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 28.169640][ T71] alloc_netdev_mqs+0x7d/0x1370
[ 28.169879][ T71] sit_init_net+0x169/0x550
[ 28.170121][ T71] ops_init+0x189/0x550
[ 28.170298][ T71] setup_net+0xf1/0x380
[ 28.170470][ T71] copy_net_ns+0x21a/0x380
[ 28.170690][ T71] create_new_namespaces+0x35f/0x900
[ 28.170914][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 28.171144][ T71] ksys_unshare+0x2a3/0x660
[ 28.171377][ T71] __x64_sys_unshare+0x31/0x40
[ 28.171614][ T71] do_syscall_64+0xc1/0xfd0
[ 28.171877][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 28.172173][ T71]
[ 28.172293][ T71] Freed by task 71:
[ 28.172469][ T71] kasan_save_stack+0x24/0x40
[ 28.172722][ T71] kasan_save_track+0x14/0x30
[ 28.172979][ T71] __kasan_save_free_info+0x3b/0x60
[ 28.173232][ T71] __kasan_slab_free+0x3f/0x60
[ 28.173456][ T71] kfree+0x21d/0x540
[ 28.173646][ T71] device_release+0x9c/0x210
[ 28.173893][ T71] kobject_cleanup+0xfe/0x360
[ 28.174132][ T71] netdev_run_todo+0x81f/0xc60
[ 28.174379][ T71] ops_undo_list+0x714/0x890
[ 28.174629][ T71] cleanup_net+0x3b2/0x830
[ 28.174885][ T71] process_one_work+0xe35/0x1650
[ 28.175137][ T71] worker_thread+0x591/0xcf0
[ 28.175393][ T71] kthread+0x37b/0x5f0
[ 28.175594][ T71] ret_from_fork+0x1db/0x270
[ 28.175858][ T71] ret_from_fork_asm+0x11/0x20
[ 28.176115][ T71]
[ 28.176258][ T71] The buggy address belongs to the object at ffff888007e99000
[ 28.176258][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 28.176895][ T71] The buggy address is located 1708 bytes inside of
[ 28.176895][ T71] freed 4096-byte region [ffff888007e99000, ffff888007e9a000)
[ 28.177529][ T71]
[ 28.177659][ T71] The buggy address belongs to the physical page:
[ 28.178027][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e98
[ 28.178496][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 28.178893][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 28.179232][ T71] page_type: f5(slab)
[ 28.179428][ T71] raw: 0080000000000040 ffff888001043700 ffffea00001d7610 ffffea0000221010
[ 28.179919][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 28.180396][ T71] head: 0080000000000040 ffff888001043700 ffffea00001d7610 ffffea0000221010
[ 28.180852][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 28.181307][ T71] head: 0080000000000003 ffffea00001fa601 00000000ffffffff 00000000ffffffff
[ 28.181756][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 28.182207][ T71] page dumped because: kasan: bad access detected
[ 28.182529][ T71]
[ 28.182660][ T71] Memory state around the buggy address:
[ 28.182915][ T71] ffff888007e99580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.183307][ T71] ffff888007e99600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.183680][ T71] >ffff888007e99680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.184058][ T71] ^
[ 28.184299][ T71] ffff888007e99700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.184679][ T71] ffff888007e99780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.185056][ T71] ==================================================================
[ 28.185510][ T71] Disabling lock debugging due to kernel taint
[ 28.185839][ T71] ------------[ cut here ]------------
[ 28.186059][ T71] refcount_t: underflow; use-after-free.
[ 28.186445][ T71] WARNING: CPU: 3 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 28.186874][ T71] Modules linked in: sctp ip6_udp_tunnel udp_tunnel xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables x_tables sch_netem cls_u32 sch_htb veth
[ 28.187635][ T71] CPU: 3 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 28.188205][ T71] Tainted: [B]=BAD_PAGE
[ 28.188390][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 28.188683][ T71] Workqueue: netns cleanup_net
[ 28.188935][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 28.189240][ 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 c5 9f 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
[ 28.190077][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 28.190396][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 28.190741][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 28.191116][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff40be220
[ 28.191478][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 28.191847][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 28.192202][ T71] FS: 0000000000000000(0000) GS:ffff88809496c000(0000) knlGS:0000000000000000
[ 28.192598][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.192905][ T71] CR2: 000056323a19b0f0 CR3: 0000000008ea1001 CR4: 0000000000772ef0
[ 28.193286][ T71] PKRU: 55555554
[ 28.193477][ T71] Call Trace:
[ 28.193651][ T71]
[ 28.193781][ T71] netdev_run_todo+0x5f0/0xc60
[ 28.194028][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 28.194293][ T71] ? generic_xdp_install+0x410/0x410
[ 28.194533][ T71] ops_undo_list+0x714/0x890
[ 28.194784][ T71] ? netns_get+0x110/0x110
[ 28.195025][ T71] ? cleanup_net+0x2d6/0x830
[ 28.195254][ T71] cleanup_net+0x3b2/0x830
[ 28.195497][ T71] ? net_passive_dec+0x190/0x190
[ 28.195730][ T71] ? rcu_is_watching+0x12/0xb0
[ 28.195981][ T71] process_one_work+0xe35/0x1650
[ 28.196229][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 28.196482][ T71] ? assign_work+0x168/0x240
[ 28.196720][ T71] worker_thread+0x591/0xcf0
[ 28.196966][ T71] ? rescuer_thread+0xd10/0xd10
[ 28.197235][ T71] kthread+0x37b/0x5f0
[ 28.197426][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.197665][ T71] ? ret_from_fork+0x1b/0x270
[ 28.197907][ T71] ? __lock_release+0x5d/0x170
[ 28.198153][ T71] ? rcu_is_watching+0x12/0xb0
[ 28.198415][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.198661][ T71] ret_from_fork+0x1db/0x270
[ 28.198901][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.199139][ T71] ret_from_fork_asm+0x11/0x20
[ 28.199413][ T71]
[ 28.199610][ T71] irq event stamp: 6859
[ 28.199800][ T71] hardirqs last enabled at (6859): [] finish_task_switch.isra.0+0x245/0x960
[ 28.200302][ T71] hardirqs last disabled at (6858): [] __schedule+0x94a/0x1b10
[ 28.200736][ T71] softirqs last enabled at (6778): [] handle_softirqs+0x352/0x610
[ 28.201203][ T71] softirqs last disabled at (6341): [] irq_exit_rcu+0xab/0x100
[ 28.201640][ T71] ---[ end trace 0000000000000000 ]---