[ 30.382426][ T68] ==================================================================
[ 30.382781][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 30.383085][ T68] Read of size 1 at addr ffff8880080f96c4 by task kworker/u16:1/68
[ 30.383352][ T68]
[ 30.383454][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.383461][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.383465][ T68] Workqueue: netns cleanup_net
[ 30.383479][ T68] Call Trace:
[ 30.383483][ T68]
[ 30.383486][ T68] dump_stack_lvl+0x82/0xc0
[ 30.383494][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 30.383503][ T68] ? kobject_put+0xbb/0xd0
[ 30.383507][ T68] print_report+0xb4/0x270
[ 30.383510][ T68] ? kobject_put+0xbb/0xd0
[ 30.383514][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 30.383517][ T68] ? kobject_put+0xbb/0xd0
[ 30.383520][ T68] kasan_report+0xca/0x100
[ 30.383524][ T68] ? kobject_put+0xbb/0xd0
[ 30.383530][ T68] kobject_put+0xbb/0xd0
[ 30.383533][ T68] netdev_run_todo+0x5f0/0xc60
[ 30.383543][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 30.383547][ T68] ? generic_xdp_install+0x410/0x410
[ 30.383550][ T68] ? net_generic+0xb1/0x1f0
[ 30.383561][ T68] ops_undo_list+0x714/0x890
[ 30.383567][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 30.383570][ T68] ? cleanup_net+0x2d6/0x8b0
[ 30.383576][ T68] cleanup_net+0x3b2/0x8b0
[ 30.383581][ T68] ? net_passive_dec+0x190/0x190
[ 30.383586][ T68] ? rcu_is_watching+0x12/0xb0
[ 30.383594][ T68] process_one_work+0xe35/0x1650
[ 30.383608][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.383614][ T68] ? assign_work+0x168/0x240
[ 30.383618][ T68] worker_thread+0x591/0xcf0
[ 30.383624][ T68] ? rescuer_thread+0xd10/0xd10
[ 30.383628][ T68] kthread+0x37b/0x5f0
[ 30.383632][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.383635][ T68] ? ret_from_fork+0x1b/0x270
[ 30.383643][ T68] ? __lock_release+0x5d/0x170
[ 30.383648][ T68] ? rcu_is_watching+0x12/0xb0
[ 30.383652][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.383655][ T68] ret_from_fork+0x1db/0x270
[ 30.383658][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.383661][ T68] ret_from_fork_asm+0x11/0x20
[ 30.383672][ T68]
[ 30.383674][ T68]
[ 30.393066][ T68] Allocated by task 322:
[ 30.393287][ T68] kasan_save_stack+0x24/0x40
[ 30.393580][ T68] kasan_save_track+0x14/0x30
[ 30.393860][ T68] __kasan_kmalloc+0x7b/0x90
[ 30.394141][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 30.394427][ T68] alloc_netdev_mqs+0x7d/0x1370
[ 30.394715][ T68] ip6_tnl_init_net+0x102/0x3f0
[ 30.395007][ T68] ops_init+0x189/0x550
[ 30.395195][ T68] setup_net+0xf1/0x380
[ 30.395403][ T68] copy_net_ns+0x253/0x510
[ 30.395692][ T68] create_new_namespaces+0x35f/0x900
[ 30.395985][ T68] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 30.396266][ T68] ksys_unshare+0x2be/0x6e0
[ 30.396550][ T68] __x64_sys_unshare+0x31/0x40
[ 30.396838][ T68] do_syscall_64+0xc1/0xfd0
[ 30.397127][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 30.397477][ T68]
[ 30.397624][ T68] Freed by task 68:
[ 30.397837][ T68] kasan_save_stack+0x24/0x40
[ 30.398141][ T68] kasan_save_track+0x14/0x30
[ 30.398424][ T68] __kasan_save_free_info+0x3b/0x60
[ 30.398701][ T68] __kasan_slab_free+0x3f/0x60
[ 30.398965][ T68] kfree+0x21d/0x540
[ 30.399142][ T68] device_release+0x9c/0x210
[ 30.399406][ T68] kobject_cleanup+0xfe/0x360
[ 30.399680][ T68] netdev_run_todo+0x81f/0xc60
[ 30.399957][ T68] ops_undo_list+0x714/0x890
[ 30.400234][ T68] cleanup_net+0x3b2/0x8b0
[ 30.400504][ T68] process_one_work+0xe35/0x1650
[ 30.400791][ T68] worker_thread+0x591/0xcf0
[ 30.401090][ T68] kthread+0x37b/0x5f0
[ 30.401309][ T68] ret_from_fork+0x1db/0x270
[ 30.401591][ T68] ret_from_fork_asm+0x11/0x20
[ 30.401865][ T68]
[ 30.402014][ T68] The buggy address belongs to the object at ffff8880080f9000
[ 30.402014][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 30.402690][ T68] The buggy address is located 1732 bytes inside of
[ 30.402690][ T68] freed 4096-byte region [ffff8880080f9000, ffff8880080fa000)
[ 30.403365][ T68]
[ 30.403511][ T68] The buggy address belongs to the physical page:
[ 30.403859][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x80f8
[ 30.404359][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 30.404774][ T68] flags: 0x80000000000040(head|node=0|zone=1)
[ 30.405158][ T68] page_type: f5(slab)
[ 30.405380][ T68] raw: 0080000000000040 ffff888001043700 ffffea00001d7210 ffffea0000217010
[ 30.405876][ T68] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.406372][ T68] head: 0080000000000040 ffff888001043700 ffffea00001d7210 ffffea0000217010
[ 30.406860][ T68] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.407329][ T68] head: 0080000000000003 ffffea0000203e01 00000000ffffffff 00000000ffffffff
[ 30.407797][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 30.408297][ T68] page dumped because: kasan: bad access detected
[ 30.408631][ T68]
[ 30.408770][ T68] Memory state around the buggy address:
[ 30.409044][ T68] ffff8880080f9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.409459][ T68] ffff8880080f9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.409867][ T68] >ffff8880080f9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.410277][ T68] ^
[ 30.410614][ T68] ffff8880080f9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.411021][ T68] ffff8880080f9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.411432][ T68] ==================================================================
[ 30.412103][ T68] Disabling lock debugging due to kernel taint
[ 30.412431][ T68] ------------[ cut here ]------------
[ 30.412868][ T68] refcount_t: underflow; use-after-free.
[ 30.413177][ T68] WARNING: CPU: 0 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 30.413655][ T68] Modules linked in: [last unloaded: test_bpf]
[ 30.414989][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.415599][ T68] Tainted: [B]=BAD_PAGE
[ 30.415928][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.416282][ T68] Workqueue: netns cleanup_net
[ 30.416583][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 30.417063][ T68] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba a5 ba e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 30.418158][ T68] RSP: 0000:ffffc90000497a08 EFLAGS: 00010282
[ 30.418523][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 30.419051][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 30.419464][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7740934
[ 30.419983][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 30.420390][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 30.420911][ T68] FS: 0000000000000000(0000) GS:ffff8880b0108000(0000) knlGS:0000000000000000
[ 30.421406][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 30.421756][ T68] CR2: 00007fd80a069658 CR3: 0000000015fe7001 CR4: 0000000000772ef0
[ 30.422294][ T68] PKRU: 55555554
[ 30.422514][ T68] Call Trace:
[ 30.422721][ T68]
[ 30.422984][ T68] netdev_run_todo+0x5f0/0xc60
[ 30.423269][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 30.423547][ T68] ? generic_xdp_install+0x410/0x410
[ 30.423945][ T68] ? net_generic+0xb1/0x1f0
[ 30.424231][ T68] ops_undo_list+0x714/0x890
[ 30.424507][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 30.424904][ T68] ? cleanup_net+0x2d6/0x8b0
[ 30.425347][ T68] cleanup_net+0x3b2/0x8b0
[ 30.425611][ T68] ? net_passive_dec+0x190/0x190
[ 30.425993][ T68] ? rcu_is_watching+0x12/0xb0
[ 30.426269][ T68] process_one_work+0xe35/0x1650
[ 30.426541][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.426934][ T68] ? assign_work+0x168/0x240
[ 30.427370][ T68] worker_thread+0x591/0xcf0
[ 30.427654][ T68] ? rescuer_thread+0xd10/0xd10
[ 30.428037][ T68] kthread+0x37b/0x5f0
[ 30.428402][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.428671][ T68] ? ret_from_fork+0x1b/0x270
[ 30.429053][ T68] ? __lock_release+0x5d/0x170
[ 30.429502][ T68] ? rcu_is_watching+0x12/0xb0
[ 30.429890][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.430328][ T68] ret_from_fork+0x1db/0x270
[ 30.430604][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.430992][ T68] ret_from_fork_asm+0x11/0x20
[ 30.431431][ T68]
[ 30.431631][ T68] irq event stamp: 13077
[ 30.431951][ T68] hardirqs last enabled at (13077): [] finish_task_switch.isra.0+0x245/0x960
[ 30.432488][ T68] hardirqs last disabled at (13076): [] __schedule+0x94a/0x1b10
[ 30.433100][ T68] softirqs last enabled at (12868): [] handle_softirqs+0x352/0x610
[ 30.433577][ T68] softirqs last disabled at (12857): [] irq_exit_rcu+0xab/0x100
[ 30.434167][ T68] ---[ end trace 0000000000000000 ]---