[ 14.944878][ T70] ==================================================================
[ 14.945241][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.945597][ T70] Read of size 1 at addr ffff888008981694 by task kworker/u16:1/70
[ 14.945991][ T70]
[ 14.946088][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.946093][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.946096][ T70] Workqueue: netns cleanup_net
[ 14.946105][ T70] Call Trace:
[ 14.946107][ T70]
[ 14.946111][ T70] dump_stack_lvl+0x82/0xc0
[ 14.946118][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 14.946126][ T70] ? kobject_put+0xbb/0xd0
[ 14.946129][ T70] print_report+0xb4/0x270
[ 14.946133][ T70] ? kobject_put+0xbb/0xd0
[ 14.946136][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 14.946140][ T70] ? kobject_put+0xbb/0xd0
[ 14.946142][ T70] kasan_report+0xca/0x100
[ 14.946147][ T70] ? kobject_put+0xbb/0xd0
[ 14.946152][ T70] kobject_put+0xbb/0xd0
[ 14.946155][ T70] netdev_run_todo+0x5f0/0xc60
[ 14.946160][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 14.946164][ T70] ? generic_xdp_install+0x410/0x410
[ 14.946170][ T70] ops_undo_list+0x714/0x890
[ 14.946174][ T70] ? netns_get+0x110/0x110
[ 14.946176][ T70] ? cleanup_net+0x2d6/0x830
[ 14.946181][ T70] cleanup_net+0x3b2/0x830
[ 14.946184][ T70] ? net_passive_dec+0x190/0x190
[ 14.946188][ T70] ? rcu_is_watching+0x12/0xb0
[ 14.946193][ T70] process_one_work+0xe35/0x1650
[ 14.946201][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.946206][ T70] ? assign_work+0x168/0x240
[ 14.946209][ T70] worker_thread+0x591/0xcf0
[ 14.946214][ T70] ? rescuer_thread+0xd10/0xd10
[ 14.946218][ T70] kthread+0x37b/0x5f0
[ 14.946223][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.946225][ T70] ? ret_from_fork+0x1b/0x270
[ 14.946230][ T70] ? __lock_release+0x5d/0x170
[ 14.946235][ T70] ? rcu_is_watching+0x12/0xb0
[ 14.946238][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.946241][ T70] ret_from_fork+0x1db/0x270
[ 14.946244][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.946246][ T70] ret_from_fork_asm+0x11/0x20
[ 14.946255][ T70]
[ 14.946256][ T70]
[ 14.953163][ T70] Allocated by task 229:
[ 14.953300][ T70] kasan_save_stack+0x24/0x40
[ 14.953501][ T70] kasan_save_track+0x14/0x30
[ 14.953671][ T70] __kasan_kmalloc+0x7b/0x90
[ 14.953847][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.954014][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 14.954186][ T70] sit_init_net+0x169/0x550
[ 14.954364][ T70] ops_init+0x189/0x550
[ 14.954503][ T70] setup_net+0xf1/0x380
[ 14.954628][ T70] copy_net_ns+0x21a/0x380
[ 14.954798][ T70] create_new_namespaces+0x35f/0x900
[ 14.954970][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 14.955141][ T70] ksys_unshare+0x2a3/0x660
[ 14.955333][ T70] __x64_sys_unshare+0x31/0x40
[ 14.955510][ T70] do_syscall_64+0xc1/0xfd0
[ 14.955684][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.955902][ T70]
[ 14.955988][ T70] Freed by task 70:
[ 14.956114][ T70] kasan_save_stack+0x24/0x40
[ 14.956304][ T70] kasan_save_track+0x14/0x30
[ 14.956535][ T70] __kasan_save_free_info+0x3b/0x60
[ 14.956718][ T70] __kasan_slab_free+0x3f/0x60
[ 14.956900][ T70] kfree+0x21d/0x540
[ 14.957044][ T70] device_release+0x9c/0x210
[ 14.957249][ T70] kobject_cleanup+0xfe/0x360
[ 14.957538][ T70] netdev_run_todo+0x81f/0xc60
[ 14.957734][ T70] ops_undo_list+0x714/0x890
[ 14.957900][ T70] cleanup_net+0x3b2/0x830
[ 14.958068][ T70] process_one_work+0xe35/0x1650
[ 14.958327][ T70] worker_thread+0x591/0xcf0
[ 14.958516][ T70] kthread+0x37b/0x5f0
[ 14.958644][ T70] ret_from_fork+0x1db/0x270
[ 14.958838][ T70] ret_from_fork_asm+0x11/0x20
[ 14.959096][ T70]
[ 14.959213][ T70] The buggy address belongs to the object at ffff888008981000
[ 14.959213][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 14.959704][ T70] The buggy address is located 1684 bytes inside of
[ 14.959704][ T70] freed 4096-byte region [ffff888008981000, ffff888008982000)
[ 14.960210][ T70]
[ 14.960314][ T70] The buggy address belongs to the physical page:
[ 14.960563][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8980
[ 14.960975][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.961233][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.961621][ T70] page_type: f5(slab)
[ 14.961761][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000225e10 ffffea0000225810
[ 14.962048][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.962488][ T70] head: 0080000000000040 ffff888001043700 ffffea0000225e10 ffffea0000225810
[ 14.962779][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.963088][ T70] head: 0080000000000003 ffffea0000226001 00000000ffffffff 00000000ffffffff
[ 14.963511][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.963793][ T70] page dumped because: kasan: bad access detected
[ 14.964086][ T70]
[ 14.964167][ T70] Memory state around the buggy address:
[ 14.964367][ T70] ffff888008981580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.964623][ T70] ffff888008981600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.964962][ T70] >ffff888008981680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.965202][ T70] ^
[ 14.965394][ T70] ffff888008981700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.965701][ T70] ffff888008981780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.965942][ T70] ==================================================================
[ 14.966232][ T70] Disabling lock debugging due to kernel taint
[ 14.966455][ T70] ------------[ cut here ]------------
[ 14.966615][ T70] refcount_t: underflow; use-after-free.
[ 14.966796][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.967176][ T70] Modules linked in: veth
[ 14.967310][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.967768][ T70] Tainted: [B]=BAD_PAGE
[ 14.968009][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.968210][ T70] Workqueue: netns cleanup_net
[ 14.968405][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.968627][ T70] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d c5 a5 e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 14.969356][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 14.969594][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.969841][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.970077][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4cbe134
[ 14.970470][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 14.970713][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.970979][ T70] FS: 0000000000000000(0000) GS:ffff88808e810000(0000) knlGS:0000000000000000
[ 14.971387][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.971628][ T70] CR2: 00007fc21a32b000 CR3: 000000000aab2004 CR4: 0000000000772ef0
[ 14.971982][ T70] PKRU: 55555554
[ 14.972115][ T70] Call Trace:
[ 14.972241][ T70]
[ 14.972331][ T70] netdev_run_todo+0x5f0/0xc60
[ 14.972540][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 14.972787][ T70] ? generic_xdp_install+0x410/0x410
[ 14.972977][ T70] ops_undo_list+0x714/0x890
[ 14.973135][ T70] ? netns_get+0x110/0x110
[ 14.973299][ T70] ? cleanup_net+0x2d6/0x830
[ 14.973569][ T70] cleanup_net+0x3b2/0x830
[ 14.973762][ T70] ? net_passive_dec+0x190/0x190
[ 14.973923][ T70] ? rcu_is_watching+0x12/0xb0
[ 14.974100][ T70] process_one_work+0xe35/0x1650
[ 14.974375][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.974543][ T70] ? assign_work+0x168/0x240
[ 14.974706][ T70] worker_thread+0x591/0xcf0
[ 14.974860][ T70] ? rescuer_thread+0xd10/0xd10
[ 14.975118][ T70] kthread+0x37b/0x5f0
[ 14.975262][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.975444][ T70] ? ret_from_fork+0x1b/0x270
[ 14.975687][ T70] ? __lock_release+0x5d/0x170
[ 14.976063][ T70] ? rcu_is_watching+0x12/0xb0
[ 14.976288][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.976507][ T70] ret_from_fork+0x1db/0x270
[ 14.976775][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.977148][ T70] ret_from_fork_asm+0x11/0x20
[ 14.977441][ T70]
[ 14.977665][ T70] irq event stamp: 2615
[ 14.977889][ T70] hardirqs last enabled at (2615): [] irqentry_exit+0x3b/0x80
[ 14.978493][ T70] hardirqs last disabled at (2614): [] handle_softirqs+0x47f/0x610
[ 14.978938][ T70] softirqs last enabled at (2502): [] handle_softirqs+0x352/0x610
[ 14.979381][ T70] softirqs last disabled at (2495): [] irq_exit_rcu+0xab/0x100
[ 14.980027][ T70] ---[ end trace 0000000000000000 ]---