[ 30.768248][ T12] ==================================================================
[ 30.768592][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 30.768916][ T12] Read of size 1 at addr ffff8880049446ac by task kworker/u16:0/12
[ 30.769177][ T12]
[ 30.769275][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.769280][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.769283][ T12] Workqueue: netns cleanup_net
[ 30.769292][ T12] Call Trace:
[ 30.769294][ T12]
[ 30.769297][ T12] dump_stack_lvl+0x82/0xc0
[ 30.769303][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 30.769313][ T12] ? kobject_put+0xbb/0xd0
[ 30.769317][ T12] print_report+0xb4/0x270
[ 30.769320][ T12] ? kobject_put+0xbb/0xd0
[ 30.769324][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 30.769327][ T12] ? kobject_put+0xbb/0xd0
[ 30.769330][ T12] kasan_report+0xca/0x100
[ 30.769335][ T12] ? kobject_put+0xbb/0xd0
[ 30.769341][ T12] kobject_put+0xbb/0xd0
[ 30.769345][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.769351][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.769355][ T12] ? generic_xdp_install+0x410/0x410
[ 30.769362][ T12] ops_undo_list+0x714/0x890
[ 30.769371][ T12] ? netns_get+0x110/0x110
[ 30.769374][ T12] ? cleanup_net+0x2d6/0x830
[ 30.769379][ T12] cleanup_net+0x3b2/0x830
[ 30.769383][ T12] ? net_passive_dec+0x190/0x190
[ 30.769386][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.769395][ T12] process_one_work+0xe35/0x1650
[ 30.769405][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.769411][ T12] ? assign_work+0x168/0x240
[ 30.769415][ T12] worker_thread+0x591/0xcf0
[ 30.769420][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.769424][ T12] kthread+0x37b/0x5f0
[ 30.769429][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.769432][ T12] ? ret_from_fork+0x1b/0x270
[ 30.769440][ T12] ? __lock_release+0x5d/0x170
[ 30.769447][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.769450][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.769453][ T12] ret_from_fork+0x1db/0x270
[ 30.769456][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.769459][ T12] ret_from_fork_asm+0x11/0x20
[ 30.769471][ T12]
[ 30.769472][ T12]
[ 30.776573][ T12] Allocated by task 252:
[ 30.776714][ T12] kasan_save_stack+0x24/0x40
[ 30.776891][ T12] kasan_save_track+0x14/0x30
[ 30.777074][ T12] __kasan_kmalloc+0x7b/0x90
[ 30.777252][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 30.777494][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 30.777716][ T12] sit_init_net+0x169/0x550
[ 30.777892][ T12] ops_init+0x189/0x550
[ 30.778061][ T12] setup_net+0xf1/0x380
[ 30.778204][ T12] copy_net_ns+0x21a/0x380
[ 30.778372][ T12] create_new_namespaces+0x35f/0x900
[ 30.778542][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 30.778709][ T12] ksys_unshare+0x2a3/0x660
[ 30.778877][ T12] __x64_sys_unshare+0x31/0x40
[ 30.779056][ T12] do_syscall_64+0xc1/0xfd0
[ 30.779232][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 30.779440][ T12]
[ 30.779530][ T12] Freed by task 12:
[ 30.779656][ T12] kasan_save_stack+0x24/0x40
[ 30.779832][ T12] kasan_save_track+0x14/0x30
[ 30.780101][ T12] __kasan_save_free_info+0x3b/0x60
[ 30.780373][ T12] __kasan_slab_free+0x3f/0x60
[ 30.780654][ T12] kfree+0x21d/0x540
[ 30.780834][ T12] device_release+0x9c/0x210
[ 30.781021][ T12] kobject_cleanup+0xfe/0x360
[ 30.781192][ T12] netdev_run_todo+0x81f/0xc60
[ 30.781364][ T12] ops_undo_list+0x714/0x890
[ 30.781532][ T12] cleanup_net+0x3b2/0x830
[ 30.781700][ T12] process_one_work+0xe35/0x1650
[ 30.781866][ T12] worker_thread+0x591/0xcf0
[ 30.782048][ T12] kthread+0x37b/0x5f0
[ 30.782215][ T12] ret_from_fork+0x1db/0x270
[ 30.782422][ T12] ret_from_fork_asm+0x11/0x20
[ 30.782629][ T12]
[ 30.782725][ T12] The buggy address belongs to the object at ffff888004944000
[ 30.782725][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 30.783140][ T12] The buggy address is located 1708 bytes inside of
[ 30.783140][ T12] freed 4096-byte region [ffff888004944000, ffff888004945000)
[ 30.783662][ T12]
[ 30.783748][ T12] The buggy address belongs to the physical page:
[ 30.784069][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4940
[ 30.784483][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 30.784797][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 30.785069][ T12] page_type: f5(slab)
[ 30.785204][ T12] raw: 0080000000000040 ffff888001043700 ffffea000007a410 ffffea000021ac10
[ 30.785508][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.785806][ T12] head: 0080000000000040 ffff888001043700 ffffea000007a410 ffffea000021ac10
[ 30.786151][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.786535][ T12] head: 0080000000000003 ffffea0000125001 00000000ffffffff 00000000ffffffff
[ 30.786838][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 30.787149][ T12] page dumped because: kasan: bad access detected
[ 30.787365][ T12]
[ 30.787489][ T12] Memory state around the buggy address:
[ 30.787692][ T12] ffff888004944580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.788045][ T12] ffff888004944600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.788312][ T12] >ffff888004944680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.788615][ T12] ^
[ 30.788823][ T12] ffff888004944700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.789156][ T12] ffff888004944780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.789405][ T12] ==================================================================
[ 30.789810][ T12] Disabling lock debugging due to kernel taint
[ 30.790049][ T12] ------------[ cut here ]------------
[ 30.790261][ T12] refcount_t: underflow; use-after-free.
[ 30.790452][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 30.790766][ T12] Modules linked in: nft_masq nft_chain_nat nf_nat nf_conntrack_netlink nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables tcp_diag inet_diag veth
[ 30.791307][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.791787][ T12] Tainted: [B]=BAD_PAGE
[ 30.791920][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.792141][ T12] Workqueue: netns cleanup_net
[ 30.792323][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 30.792555][ 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 b3 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
[ 30.793176][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 30.793399][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 30.793655][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 30.793906][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff67fe220
[ 30.794193][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 30.794443][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 30.794704][ T12] FS: 0000000000000000(0000) GS:ffff888080e6c000(0000) knlGS:0000000000000000
[ 30.794994][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 30.795222][ T12] CR2: 00007fff362f6c68 CR3: 000000000830b001 CR4: 0000000000772ef0
[ 30.795472][ T12] PKRU: 55555554
[ 30.795603][ T12] Call Trace:
[ 30.795732][ T12]
[ 30.795819][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.795987][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.796172][ T12] ? generic_xdp_install+0x410/0x410
[ 30.796348][ T12] ops_undo_list+0x714/0x890
[ 30.796545][ T12] ? netns_get+0x110/0x110
[ 30.796711][ T12] ? cleanup_net+0x2d6/0x830
[ 30.796879][ T12] cleanup_net+0x3b2/0x830
[ 30.797042][ T12] ? net_passive_dec+0x190/0x190
[ 30.797220][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.797391][ T12] process_one_work+0xe35/0x1650
[ 30.797566][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.797743][ T12] ? assign_work+0x168/0x240
[ 30.797909][ T12] worker_thread+0x591/0xcf0
[ 30.798083][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.798261][ T12] kthread+0x37b/0x5f0
[ 30.798389][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.798560][ T12] ? ret_from_fork+0x1b/0x270
[ 30.798729][ T12] ? __lock_release+0x5d/0x170
[ 30.798894][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.799073][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.799251][ T12] ret_from_fork+0x1db/0x270
[ 30.799419][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.799597][ T12] ret_from_fork_asm+0x11/0x20
[ 30.799766][ T12]
[ 30.799895][ T12] irq event stamp: 4431
[ 30.800022][ T12] hardirqs last enabled at (4431): [] finish_task_switch.isra.0+0x245/0x960
[ 30.800370][ T12] hardirqs last disabled at (4430): [] __schedule+0x94a/0x1b10
[ 30.800684][ T12] softirqs last enabled at (4288): [] handle_softirqs+0x352/0x610
[ 30.800973][ T12] softirqs last disabled at (4281): [] irq_exit_rcu+0xab/0x100
[ 30.801274][ T12] ---[ end trace 0000000000000000 ]---