[ 16.534863][ T12] ==================================================================
[ 16.535413][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.535869][ T12] Read of size 1 at addr ffff888005219694 by task kworker/u16:0/12
[ 16.536280][ T12]
[ 16.536420][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.536428][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.536432][ T12] Workqueue: netns cleanup_net
[ 16.536442][ T12] Call Trace:
[ 16.536446][ T12]
[ 16.536449][ T12] dump_stack_lvl+0x82/0xc0
[ 16.536459][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.536471][ T12] ? kobject_put+0xbb/0xd0
[ 16.536477][ T12] print_report+0xb4/0x270
[ 16.536484][ T12] ? kobject_put+0xbb/0xd0
[ 16.536488][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.536495][ T12] ? kobject_put+0xbb/0xd0
[ 16.536499][ T12] kasan_report+0xca/0x100
[ 16.536507][ T12] ? kobject_put+0xbb/0xd0
[ 16.536516][ T12] kobject_put+0xbb/0xd0
[ 16.536522][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.536532][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.536538][ T12] ? generic_xdp_install+0x410/0x410
[ 16.536551][ T12] ops_undo_list+0x714/0x890
[ 16.536559][ T12] ? netns_get+0x110/0x110
[ 16.536563][ T12] ? cleanup_net+0x2d6/0x830
[ 16.536572][ T12] cleanup_net+0x3b2/0x830
[ 16.536578][ T12] ? net_passive_dec+0x190/0x190
[ 16.536586][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.536596][ T12] process_one_work+0xe35/0x1650
[ 16.536611][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.536621][ T12] ? assign_work+0x168/0x240
[ 16.536628][ T12] worker_thread+0x591/0xcf0
[ 16.536638][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.536644][ T12] kthread+0x37b/0x5f0
[ 16.536652][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.536656][ T12] ? ret_from_fork+0x1b/0x270
[ 16.536664][ T12] ? __lock_release+0x5d/0x170
[ 16.536674][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.536679][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.536685][ T12] ret_from_fork+0x1db/0x270
[ 16.536691][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.536696][ T12] ret_from_fork_asm+0x11/0x20
[ 16.536711][ T12]
[ 16.536713][ T12]
[ 16.546804][ T12] Allocated by task 227:
[ 16.547008][ T12] kasan_save_stack+0x24/0x40
[ 16.547294][ T12] kasan_save_track+0x14/0x30
[ 16.547573][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.547847][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.548153][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.548419][ T12] sit_init_net+0x169/0x550
[ 16.548712][ T12] ops_init+0x189/0x550
[ 16.548910][ T12] setup_net+0xf1/0x380
[ 16.549114][ T12] copy_net_ns+0x21a/0x380
[ 16.549374][ T12] create_new_namespaces+0x35f/0x900
[ 16.549642][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.549909][ T12] ksys_unshare+0x2a3/0x660
[ 16.550174][ T12] __x64_sys_unshare+0x31/0x40
[ 16.550432][ T12] do_syscall_64+0xc1/0xfd0
[ 16.550695][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.551024][ T12]
[ 16.551160][ T12] Freed by task 12:
[ 16.551356][ T12] kasan_save_stack+0x24/0x40
[ 16.551634][ T12] kasan_save_track+0x14/0x30
[ 16.551905][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.552183][ T12] __kasan_slab_free+0x3f/0x60
[ 16.552447][ T12] kfree+0x21d/0x540
[ 16.552652][ T12] device_release+0x9c/0x210
[ 16.552949][ T12] kobject_cleanup+0xfe/0x360
[ 16.553219][ T12] netdev_run_todo+0x81f/0xc60
[ 16.553515][ T12] ops_undo_list+0x714/0x890
[ 16.553769][ T12] cleanup_net+0x3b2/0x830
[ 16.554114][ T12] process_one_work+0xe35/0x1650
[ 16.554402][ T12] worker_thread+0x591/0xcf0
[ 16.554673][ T12] kthread+0x37b/0x5f0
[ 16.554872][ T12] ret_from_fork+0x1db/0x270
[ 16.555145][ T12] ret_from_fork_asm+0x11/0x20
[ 16.555412][ T12]
[ 16.555562][ T12] The buggy address belongs to the object at ffff888005219000
[ 16.555562][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.556204][ T12] The buggy address is located 1684 bytes inside of
[ 16.556204][ T12] freed 4096-byte region [ffff888005219000, ffff88800521a000)
[ 16.556910][ T12]
[ 16.557048][ T12] The buggy address belongs to the physical page:
[ 16.557412][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5218
[ 16.557905][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.558313][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.558650][ T12] page_type: f5(slab)
[ 16.558862][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002fc410 ffffea00001c8210
[ 16.559378][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.559876][ T12] head: 0080000000000040 ffff888001043700 ffffea00002fc410 ffffea00001c8210
[ 16.560366][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.560848][ T12] head: 0080000000000003 ffffea0000148601 00000000ffffffff 00000000ffffffff
[ 16.561338][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.561804][ T12] page dumped because: kasan: bad access detected
[ 16.562125][ T12]
[ 16.562254][ T12] Memory state around the buggy address:
[ 16.562504][ T12] ffff888005219580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.562892][ T12] ffff888005219600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.563309][ T12] >ffff888005219680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.563719][ T12] ^
[ 16.564019][ T12] ffff888005219700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.564404][ T12] ffff888005219780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.564787][ T12] ==================================================================
[ 16.565872][ T12] Disabling lock debugging due to kernel taint
[ 16.566226][ T12] ------------[ cut here ]------------
[ 16.567205][ T12] refcount_t: underflow; use-after-free.
[ 16.567517][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.567976][ T12] Modules linked in: veth
[ 16.568195][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.568799][ T12] Tainted: [B]=BAD_PAGE
[ 16.568999][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.569333][ T12] Workqueue: netns cleanup_net
[ 16.569612][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.569947][ T12] 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 25 87 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
[ 16.570901][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.571238][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.571638][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.572081][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0f7e134
[ 16.572486][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.572882][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.573468][ T12] FS: 0000000000000000(0000) GS:ffff8880ad210000(0000) knlGS:0000000000000000
[ 16.573965][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.574308][ T12] CR2: 00007f3994aa0000 CR3: 000000002d535006 CR4: 0000000000772ef0
[ 16.574681][ T12] PKRU: 55555554
[ 16.574867][ T12] Call Trace:
[ 16.575046][ T12]
[ 16.575173][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.575797][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.576066][ T12] ? generic_xdp_install+0x410/0x410
[ 16.576357][ T12] ops_undo_list+0x714/0x890
[ 16.576643][ T12] ? netns_get+0x110/0x110
[ 16.577067][ T12] ? cleanup_net+0x2d6/0x830
[ 16.577329][ T12] cleanup_net+0x3b2/0x830
[ 16.577581][ T12] ? net_passive_dec+0x190/0x190
[ 16.577817][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.578243][ T12] process_one_work+0xe35/0x1650
[ 16.578521][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.578785][ T12] ? assign_work+0x168/0x240
[ 16.579044][ T12] worker_thread+0x591/0xcf0
[ 16.579468][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.579733][ T12] kthread+0x37b/0x5f0
[ 16.579922][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.580176][ T12] ? ret_from_fork+0x1b/0x270
[ 16.580472][ T12] ? __lock_release+0x5d/0x170
[ 16.580753][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.581007][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.581274][ T12] ret_from_fork+0x1db/0x270
[ 16.581710][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.581966][ T12] ret_from_fork_asm+0x11/0x20
[ 16.582236][ T12]
[ 16.582464][ T12] irq event stamp: 3065
[ 16.582861][ T12] hardirqs last enabled at (3065): [] finish_task_switch.isra.0+0x245/0x960
[ 16.583399][ T12] hardirqs last disabled at (3064): [] __schedule+0x94a/0x1b10
[ 16.583873][ T12] softirqs last enabled at (2976): [] handle_softirqs+0x352/0x610
[ 16.584531][ T12] softirqs last disabled at (2795): [] irq_exit_rcu+0xab/0x100
[ 16.584984][ T12] ---[ end trace 0000000000000000 ]---
[ 17.091005][ T227] connect_ipv4 (227) used greatest stack depth: 24400 bytes left