[ 18.749888][ T252] ip (252) used greatest stack depth: 23648 bytes left
[ 30.957830][ T12] ==================================================================
[ 30.958142][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 30.958465][ T12] Read of size 1 at addr ffff8880070046ac by task kworker/u16:0/12
[ 30.958698][ T12]
[ 30.958782][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.958788][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.958790][ T12] Workqueue: netns cleanup_net
[ 30.958797][ T12] Call Trace:
[ 30.958800][ T12]
[ 30.958802][ T12] dump_stack_lvl+0x82/0xc0
[ 30.958808][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 30.958817][ T12] ? kobject_put+0xbb/0xd0
[ 30.958821][ T12] print_report+0xb4/0x270
[ 30.958825][ T12] ? kobject_put+0xbb/0xd0
[ 30.958828][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 30.958832][ T12] ? kobject_put+0xbb/0xd0
[ 30.958835][ T12] kasan_report+0xca/0x100
[ 30.958840][ T12] ? kobject_put+0xbb/0xd0
[ 30.958846][ T12] kobject_put+0xbb/0xd0
[ 30.958849][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.958855][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.958859][ T12] ? generic_xdp_install+0x410/0x410
[ 30.958866][ T12] ops_undo_list+0x714/0x890
[ 30.958874][ T12] ? netns_get+0x110/0x110
[ 30.958878][ T12] ? cleanup_net+0x2d6/0x830
[ 30.958883][ T12] cleanup_net+0x3b2/0x830
[ 30.958886][ T12] ? net_passive_dec+0x190/0x190
[ 30.958890][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.958897][ T12] process_one_work+0xe35/0x1650
[ 30.958906][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.958912][ T12] ? assign_work+0x168/0x240
[ 30.958916][ T12] worker_thread+0x591/0xcf0
[ 30.958921][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.958925][ T12] kthread+0x37b/0x5f0
[ 30.958929][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.958932][ T12] ? ret_from_fork+0x1b/0x270
[ 30.958939][ T12] ? __lock_release+0x5d/0x170
[ 30.958946][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.958949][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.958953][ T12] ret_from_fork+0x1db/0x270
[ 30.958956][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.958959][ T12] ret_from_fork_asm+0x11/0x20
[ 30.958973][ T12]
[ 30.958975][ T12]
[ 30.965395][ T12] Allocated by task 251:
[ 30.965522][ T12] kasan_save_stack+0x24/0x40
[ 30.965694][ T12] kasan_save_track+0x14/0x30
[ 30.965860][ T12] __kasan_kmalloc+0x7b/0x90
[ 30.966040][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 30.966212][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 30.966382][ T12] sit_init_net+0x169/0x550
[ 30.966550][ T12] ops_init+0x189/0x550
[ 30.966672][ T12] setup_net+0xf1/0x380
[ 30.966794][ T12] copy_net_ns+0x21a/0x380
[ 30.966954][ T12] create_new_namespaces+0x35f/0x900
[ 30.967141][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 30.967310][ T12] ksys_unshare+0x2a3/0x660
[ 30.967477][ T12] __x64_sys_unshare+0x31/0x40
[ 30.967639][ T12] do_syscall_64+0xc1/0xfd0
[ 30.967801][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 30.968015][ T12]
[ 30.968107][ T12] Freed by task 12:
[ 30.968236][ T12] kasan_save_stack+0x24/0x40
[ 30.968410][ T12] kasan_save_track+0x14/0x30
[ 30.968571][ T12] __kasan_save_free_info+0x3b/0x60
[ 30.968733][ T12] __kasan_slab_free+0x3f/0x60
[ 30.968890][ T12] kfree+0x21d/0x540
[ 30.969022][ T12] device_release+0x9c/0x210
[ 30.969204][ T12] kobject_cleanup+0xfe/0x360
[ 30.969368][ T12] netdev_run_todo+0x81f/0xc60
[ 30.969531][ T12] ops_undo_list+0x714/0x890
[ 30.969694][ T12] cleanup_net+0x3b2/0x830
[ 30.969851][ T12] process_one_work+0xe35/0x1650
[ 30.970021][ T12] worker_thread+0x591/0xcf0
[ 30.970191][ T12] kthread+0x37b/0x5f0
[ 30.970318][ T12] ret_from_fork+0x1db/0x270
[ 30.970488][ T12] ret_from_fork_asm+0x11/0x20
[ 30.970652][ T12]
[ 30.970736][ T12] The buggy address belongs to the object at ffff888007004000
[ 30.970736][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 30.971145][ T12] The buggy address is located 1708 bytes inside of
[ 30.971145][ T12] freed 4096-byte region [ffff888007004000, ffff888007005000)
[ 30.971544][ T12]
[ 30.971628][ T12] The buggy address belongs to the physical page:
[ 30.971820][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7000
[ 30.972132][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 30.972386][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 30.972595][ T12] page_type: f5(slab)
[ 30.972722][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000094e10 ffffea0000155a10
[ 30.973021][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.973326][ T12] head: 0080000000000040 ffff888001043700 ffffea0000094e10 ffffea0000155a10
[ 30.973616][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.973897][ T12] head: 0080000000000003 ffffea00001c0001 00000000ffffffff 00000000ffffffff
[ 30.974201][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 30.974493][ T12] page dumped because: kasan: bad access detected
[ 30.974692][ T12]
[ 30.974775][ T12] Memory state around the buggy address:
[ 30.974929][ T12] ffff888007004580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.975185][ T12] ffff888007004600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.975429][ T12] >ffff888007004680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.975666][ T12] ^
[ 30.975823][ T12] ffff888007004700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.976066][ T12] ffff888007004780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.976304][ T12] ==================================================================
[ 30.976696][ T12] Disabling lock debugging due to kernel taint
[ 30.976897][ T12] ------------[ cut here ]------------
[ 30.977087][ T12] refcount_t: underflow; use-after-free.
[ 30.977291][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 30.977581][ T12] Modules linked in: nft_synproxy nf_synproxy_core nft_ct nf_tables veth nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
[ 30.977965][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.978362][ T12] Tainted: [B]=BAD_PAGE
[ 30.978484][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.978682][ T12] Workqueue: netns cleanup_net
[ 30.978846][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 30.979087][ 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 25 88 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
[ 30.979666][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 30.979871][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 30.980147][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 30.980402][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff117e220
[ 30.980642][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 30.980881][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 30.981149][ T12] FS: 0000000000000000(0000) GS:ffff8880ac1ec000(0000) knlGS:0000000000000000
[ 30.981442][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 30.981643][ T12] CR2: 00007fffbf0b9ce8 CR3: 0000000009041003 CR4: 0000000000772ef0
[ 30.981884][ T12] PKRU: 55555554
[ 30.982026][ T12] Call Trace:
[ 30.982183][ T12]
[ 30.982273][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.982444][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.982606][ T12] ? generic_xdp_install+0x410/0x410
[ 30.982767][ T12] ops_undo_list+0x714/0x890
[ 30.982929][ T12] ? netns_get+0x110/0x110
[ 30.983118][ T12] ? cleanup_net+0x2d6/0x830
[ 30.983287][ T12] cleanup_net+0x3b2/0x830
[ 30.983449][ T12] ? net_passive_dec+0x190/0x190
[ 30.983612][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.983773][ T12] process_one_work+0xe35/0x1650
[ 30.983934][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.984219][ T12] ? assign_work+0x168/0x240
[ 30.984378][ T12] worker_thread+0x591/0xcf0
[ 30.984537][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.984690][ T12] kthread+0x37b/0x5f0
[ 30.984809][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.985084][ T12] ? ret_from_fork+0x1b/0x270
[ 30.985261][ T12] ? __lock_release+0x5d/0x170
[ 30.985424][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.985581][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.985822][ T12] ret_from_fork+0x1db/0x270
[ 30.985986][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.986160][ T12] ret_from_fork_asm+0x11/0x20
[ 30.986332][ T12]
[ 30.986540][ T12] irq event stamp: 10257
[ 30.986669][ T12] hardirqs last enabled at (10257): [] finish_task_switch.isra.0+0x245/0x960
[ 30.986983][ T12] hardirqs last disabled at (10256): [] __schedule+0x94a/0x1b10
[ 30.987382][ T12] softirqs last enabled at (9380): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 30.987698][ T12] softirqs last disabled at (9378): [] dev_mc_flush+0x54/0x90
[ 30.987985][ T12] ---[ end trace 0000000000000000 ]---