[ 61.547884][ T703] ip (703) used greatest stack depth: 24096 bytes left
[ 86.552010][ T12] ==================================================================
[ 86.552370][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 86.552659][ T12] Read of size 1 at addr ffff888009f7c6ac by task kworker/u16:0/12
[ 86.552925][ T12]
[ 86.553022][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 86.553029][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 86.553033][ T12] Workqueue: netns cleanup_net
[ 86.553044][ T12] Call Trace:
[ 86.553049][ T12]
[ 86.553052][ T12] dump_stack_lvl+0x82/0xc0
[ 86.553059][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 86.553076][ T12] ? kobject_put+0xbb/0xd0
[ 86.553080][ T12] print_report+0xb4/0x270
[ 86.553084][ T12] ? kobject_put+0xbb/0xd0
[ 86.553087][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 86.553090][ T12] ? kobject_put+0xbb/0xd0
[ 86.553094][ T12] kasan_report+0xca/0x100
[ 86.553098][ T12] ? kobject_put+0xbb/0xd0
[ 86.553104][ T12] kobject_put+0xbb/0xd0
[ 86.553107][ T12] netdev_run_todo+0x5f0/0xc60
[ 86.553114][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 86.553118][ T12] ? generic_xdp_install+0x410/0x410
[ 86.553125][ T12] ops_undo_list+0x714/0x890
[ 86.553133][ T12] ? netns_get+0x110/0x110
[ 86.553139][ T12] ? cleanup_net+0x2d6/0x830
[ 86.553144][ T12] cleanup_net+0x3b2/0x830
[ 86.553147][ T12] ? net_passive_dec+0x190/0x190
[ 86.553151][ T12] ? rcu_is_watching+0x12/0xb0
[ 86.553164][ T12] process_one_work+0xe35/0x1650
[ 86.553176][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 86.553181][ T12] ? assign_work+0x168/0x240
[ 86.553185][ T12] worker_thread+0x591/0xcf0
[ 86.553191][ T12] ? rescuer_thread+0xd10/0xd10
[ 86.553195][ T12] kthread+0x37b/0x5f0
[ 86.553201][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 86.553204][ T12] ? ret_from_fork+0x1b/0x270
[ 86.553219][ T12] ? __lock_release+0x5d/0x170
[ 86.553228][ T12] ? rcu_is_watching+0x12/0xb0
[ 86.553231][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 86.553235][ T12] ret_from_fork+0x1db/0x270
[ 86.553238][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 86.553241][ T12] ret_from_fork_asm+0x11/0x20
[ 86.553254][ T12]
[ 86.553255][ T12]
[ 86.559719][ T12] Allocated by task 697:
[ 86.559849][ T12] kasan_save_stack+0x24/0x40
[ 86.560017][ T12] kasan_save_track+0x14/0x30
[ 86.560186][ T12] __kasan_kmalloc+0x7b/0x90
[ 86.560357][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 86.560534][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 86.560705][ T12] sit_init_net+0x169/0x550
[ 86.560879][ T12] ops_init+0x189/0x550
[ 86.561010][ T12] setup_net+0xf1/0x380
[ 86.561139][ T12] copy_net_ns+0x21a/0x380
[ 86.561307][ T12] create_new_namespaces+0x35f/0x900
[ 86.561480][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 86.561649][ T12] ksys_unshare+0x2a3/0x660
[ 86.561821][ T12] __x64_sys_unshare+0x31/0x40
[ 86.561990][ T12] do_syscall_64+0xc1/0xfd0
[ 86.562166][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 86.562385][ T12]
[ 86.562469][ T12] Freed by task 12:
[ 86.562598][ T12] kasan_save_stack+0x24/0x40
[ 86.562768][ T12] kasan_save_track+0x14/0x30
[ 86.562945][ T12] __kasan_save_free_info+0x3b/0x60
[ 86.563133][ T12] __kasan_slab_free+0x3f/0x60
[ 86.563301][ T12] kfree+0x21d/0x540
[ 86.563437][ T12] device_release+0x9c/0x210
[ 86.563615][ T12] kobject_cleanup+0xfe/0x360
[ 86.563784][ T12] netdev_run_todo+0x81f/0xc60
[ 86.563952][ T12] ops_undo_list+0x714/0x890
[ 86.564120][ T12] cleanup_net+0x3b2/0x830
[ 86.564283][ T12] process_one_work+0xe35/0x1650
[ 86.564452][ T12] worker_thread+0x591/0xcf0
[ 86.564620][ T12] kthread+0x37b/0x5f0
[ 86.564747][ T12] ret_from_fork+0x1db/0x270
[ 86.564925][ T12] ret_from_fork_asm+0x11/0x20
[ 86.565093][ T12]
[ 86.565179][ T12] The buggy address belongs to the object at ffff888009f7c000
[ 86.565179][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 86.565587][ T12] The buggy address is located 1708 bytes inside of
[ 86.565587][ T12] freed 4096-byte region [ffff888009f7c000, ffff888009f7d000)
[ 86.566011][ T12]
[ 86.566096][ T12] The buggy address belongs to the physical page:
[ 86.566305][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9f78
[ 86.566612][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 86.566870][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 86.567091][ T12] page_type: f5(slab)
[ 86.567233][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000125410 ffffea0000079c10
[ 86.567541][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 86.567836][ T12] head: 0080000000000040 ffff888001043700 ffffea0000125410 ffffea0000079c10
[ 86.568136][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 86.568440][ T12] head: 0080000000000003 ffffea000027de01 00000000ffffffff 00000000ffffffff
[ 86.568736][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 86.569035][ T12] page dumped because: kasan: bad access detected
[ 86.569242][ T12]
[ 86.569326][ T12] Memory state around the buggy address:
[ 86.569497][ T12] ffff888009f7c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 86.569750][ T12] ffff888009f7c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 86.569993][ T12] >ffff888009f7c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 86.570240][ T12] ^
[ 86.570405][ T12] ffff888009f7c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 86.570652][ T12] ffff888009f7c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 86.570988][ T12] ==================================================================
[ 86.571284][ T12] Disabling lock debugging due to kernel taint
[ 86.571530][ T12] ------------[ cut here ]------------
[ 86.572131][ T12] refcount_t: underflow; use-after-free.
[ 86.572380][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 86.572667][ T12] Modules linked in: tcp_diag inet_diag nft_tproxy nf_tproxy_ipv6 nf_tproxy_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 veth nft_quota nf_tables
[ 86.573091][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 86.573441][ T12] Tainted: [B]=BAD_PAGE
[ 86.573566][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 86.573772][ T12] Workqueue: netns cleanup_net
[ 86.573940][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 86.574149][ 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 05 9a 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
[ 86.574701][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 86.574920][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 86.575163][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 86.575398][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff353e220
[ 86.575641][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 86.575895][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 86.576133][ T12] FS: 0000000000000000(0000) GS:ffff88809486c000(0000) knlGS:0000000000000000
[ 86.576406][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 86.576604][ T12] CR2: 00007ffec9c94d00 CR3: 000000003cf35001 CR4: 0000000000772ef0
[ 86.576853][ T12] PKRU: 55555554
[ 86.576978][ T12] Call Trace:
[ 86.577098][ T12]
[ 86.577178][ T12] netdev_run_todo+0x5f0/0xc60
[ 86.577345][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 86.577500][ T12] ? generic_xdp_install+0x410/0x410
[ 86.577658][ T12] ops_undo_list+0x714/0x890
[ 86.577826][ T12] ? netns_get+0x110/0x110
[ 86.577992][ T12] ? cleanup_net+0x2d6/0x830
[ 86.578147][ T12] cleanup_net+0x3b2/0x830
[ 86.578298][ T12] ? net_passive_dec+0x190/0x190
[ 86.578456][ T12] ? rcu_is_watching+0x12/0xb0
[ 86.578613][ T12] process_one_work+0xe35/0x1650
[ 86.578874][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 86.579034][ T12] ? assign_work+0x168/0x240
[ 86.579192][ T12] worker_thread+0x591/0xcf0
[ 86.579353][ T12] ? rescuer_thread+0xd10/0xd10
[ 86.579590][ T12] kthread+0x37b/0x5f0
[ 86.579705][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 86.579867][ T12] ? ret_from_fork+0x1b/0x270
[ 86.580033][ T12] ? __lock_release+0x5d/0x170
[ 86.580275][ T12] ? rcu_is_watching+0x12/0xb0
[ 86.580433][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 86.580586][ T12] ret_from_fork+0x1db/0x270
[ 86.580752][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 86.580997][ T12] ret_from_fork_asm+0x11/0x20
[ 86.581155][ T12]
[ 86.581270][ T12] irq event stamp: 8511
[ 86.581389][ T12] hardirqs last enabled at (8511): [] finish_task_switch.isra.0+0x245/0x960
[ 86.581792][ T12] hardirqs last disabled at (8510): [] __schedule+0x94a/0x1b10
[ 86.582099][ T12] softirqs last enabled at (8426): [] handle_softirqs+0x352/0x610
[ 86.582459][ T12] softirqs last disabled at (8419): [] irq_exit_rcu+0xab/0x100
[ 86.582726][ T12] ---[ end trace 0000000000000000 ]---