[ 16.574048][ T69] ==================================================================
[ 16.574369][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.574672][ T69] Read of size 1 at addr ffff8880083816c4 by task kworker/u16:1/69
[ 16.574930][ T69]
[ 16.575022][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.575028][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.575032][ T69] Workqueue: netns cleanup_net
[ 16.575042][ T69] Call Trace:
[ 16.575045][ T69]
[ 16.575048][ T69] dump_stack_lvl+0x82/0xc0
[ 16.575053][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 16.575061][ T69] ? kobject_put+0xbb/0xd0
[ 16.575065][ T69] print_report+0xb4/0x270
[ 16.575068][ T69] ? kobject_put+0xbb/0xd0
[ 16.575072][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 16.575076][ T69] ? kobject_put+0xbb/0xd0
[ 16.575079][ T69] kasan_report+0xca/0x100
[ 16.575083][ T69] ? kobject_put+0xbb/0xd0
[ 16.575088][ T69] kobject_put+0xbb/0xd0
[ 16.575091][ T69] netdev_run_todo+0x5f0/0xc60
[ 16.575100][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 16.575105][ T69] ? generic_xdp_install+0x410/0x410
[ 16.575110][ T69] ? net_generic+0xb1/0x1f0
[ 16.575122][ T69] ops_undo_list+0x714/0x890
[ 16.575127][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.575131][ T69] ? cleanup_net+0x2d6/0x8b0
[ 16.575137][ T69] cleanup_net+0x3b2/0x8b0
[ 16.575141][ T69] ? net_passive_dec+0x190/0x190
[ 16.575146][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.575154][ T69] process_one_work+0xe35/0x1650
[ 16.575164][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.575170][ T69] ? assign_work+0x168/0x240
[ 16.575174][ T69] worker_thread+0x591/0xcf0
[ 16.575180][ T69] ? rescuer_thread+0xd10/0xd10
[ 16.575184][ T69] kthread+0x37b/0x5f0
[ 16.575188][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.575191][ T69] ? ret_from_fork+0x1b/0x270
[ 16.575197][ T69] ? __lock_release+0x5d/0x170
[ 16.575201][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.575204][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.575208][ T69] ret_from_fork+0x1db/0x270
[ 16.575211][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.575214][ T69] ret_from_fork_asm+0x11/0x20
[ 16.575223][ T69]
[ 16.575224][ T69]
[ 16.581674][ T69] Allocated by task 268:
[ 16.581799][ T69] kasan_save_stack+0x24/0x40
[ 16.581969][ T69] kasan_save_track+0x14/0x30
[ 16.582138][ T69] __kasan_kmalloc+0x7b/0x90
[ 16.582301][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.582469][ T69] alloc_netdev_mqs+0x7d/0x1370
[ 16.582646][ T69] ip6_tnl_init_net+0x102/0x3f0
[ 16.582813][ T69] ops_init+0x189/0x550
[ 16.582937][ T69] setup_net+0xf1/0x380
[ 16.583061][ T69] copy_net_ns+0x253/0x510
[ 16.583229][ T69] create_new_namespaces+0x35f/0x900
[ 16.583391][ T69] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 16.583565][ T69] ksys_unshare+0x2be/0x6e0
[ 16.583728][ T69] __x64_sys_unshare+0x31/0x40
[ 16.583887][ T69] do_syscall_64+0xc1/0xfd0
[ 16.584048][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.584260][ T69]
[ 16.584342][ T69] Freed by task 69:
[ 16.584463][ T69] kasan_save_stack+0x24/0x40
[ 16.584630][ T69] kasan_save_track+0x14/0x30
[ 16.584794][ T69] __kasan_save_free_info+0x3b/0x60
[ 16.584959][ T69] __kasan_slab_free+0x3f/0x60
[ 16.585129][ T69] kfree+0x21d/0x540
[ 16.585253][ T69] device_release+0x9c/0x210
[ 16.585416][ T69] kobject_cleanup+0xfe/0x360
[ 16.585588][ T69] netdev_run_todo+0x81f/0xc60
[ 16.585753][ T69] ops_undo_list+0x714/0x890
[ 16.585924][ T69] cleanup_net+0x3b2/0x8b0
[ 16.586086][ T69] process_one_work+0xe35/0x1650
[ 16.586262][ T69] worker_thread+0x591/0xcf0
[ 16.586449][ T69] kthread+0x37b/0x5f0
[ 16.586581][ T69] ret_from_fork+0x1db/0x270
[ 16.586742][ T69] ret_from_fork_asm+0x11/0x20
[ 16.586909][ T69]
[ 16.586990][ T69] The buggy address belongs to the object at ffff888008381000
[ 16.586990][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 16.587376][ T69] The buggy address is located 1732 bytes inside of
[ 16.587376][ T69] freed 4096-byte region [ffff888008381000, ffff888008382000)
[ 16.587768][ T69]
[ 16.587850][ T69] The buggy address belongs to the physical page:
[ 16.588051][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8380
[ 16.588346][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.588604][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.588811][ T69] page_type: f5(slab)
[ 16.588943][ T69] raw: 0080000000000040 ffff888001043700 ffffea0000214010 ffffea000020e610
[ 16.589240][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.589519][ T69] head: 0080000000000040 ffff888001043700 ffffea0000214010 ffffea000020e610
[ 16.589841][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.590132][ T69] head: 0080000000000003 ffffea000020e001 00000000ffffffff 00000000ffffffff
[ 16.590411][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.590706][ T69] page dumped because: kasan: bad access detected
[ 16.590905][ T69]
[ 16.590992][ T69] Memory state around the buggy address:
[ 16.591158][ T69] ffff888008381580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.591390][ T69] ffff888008381600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.591620][ T69] >ffff888008381680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.591851][ T69] ^
[ 16.592056][ T69] ffff888008381700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.592297][ T69] ffff888008381780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.592517][ T69] ==================================================================
[ 16.592786][ T69] Disabling lock debugging due to kernel taint
[ 16.593002][ T69] ------------[ cut here ]------------
[ 16.593165][ T69] refcount_t: underflow; use-after-free.
[ 16.593369][ T69] WARNING: CPU: 0 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.593655][ T69] Modules linked in:
[ 16.593782][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.594139][ T69] Tainted: [B]=BAD_PAGE
[ 16.594264][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.595026][ T69] Workqueue: netns cleanup_net
[ 16.595214][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.595489][ T69] 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 e5 a2 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
[ 16.596088][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 16.596325][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.596674][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.596907][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff47c0934
[ 16.597160][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 16.597473][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.597718][ T69] FS: 0000000000000000(0000) GS:ffff8880c7d08000(0000) knlGS:0000000000000000
[ 16.597991][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.598196][ T69] CR2: 00007f455f04eae0 CR3: 000000005a149002 CR4: 0000000000772ef0
[ 16.598497][ T69] PKRU: 55555554
[ 16.598623][ T69] Call Trace:
[ 16.598739][ T69]
[ 16.598820][ T69] netdev_run_todo+0x5f0/0xc60
[ 16.598981][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 16.599154][ T69] ? generic_xdp_install+0x410/0x410
[ 16.599306][ T69] ? net_generic+0xb1/0x1f0
[ 16.599530][ T69] ops_undo_list+0x714/0x890
[ 16.599703][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.599858][ T69] ? cleanup_net+0x2d6/0x8b0
[ 16.600017][ T69] cleanup_net+0x3b2/0x8b0
[ 16.600170][ T69] ? net_passive_dec+0x190/0x190
[ 16.600323][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.600556][ T69] process_one_work+0xe35/0x1650
[ 16.600723][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.600887][ T69] ? assign_work+0x168/0x240
[ 16.601047][ T69] worker_thread+0x591/0xcf0
[ 16.601207][ T69] ? rescuer_thread+0xd10/0xd10
[ 16.601393][ T69] kthread+0x37b/0x5f0
[ 16.601516][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.601679][ T69] ? ret_from_fork+0x1b/0x270
[ 16.601839][ T69] ? __lock_release+0x5d/0x170
[ 16.602002][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.602160][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.602318][ T69] ret_from_fork+0x1db/0x270
[ 16.602486][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.602651][ T69] ret_from_fork_asm+0x11/0x20
[ 16.602815][ T69]
[ 16.602940][ T69] irq event stamp: 19003
[ 16.603059][ T69] hardirqs last enabled at (19003): [] __schedule+0x13c7/0x1b10
[ 16.603443][ T69] hardirqs last disabled at (19002): [] __schedule+0x94a/0x1b10
[ 16.603728][ T69] softirqs last enabled at (18770): [] handle_softirqs+0x352/0x610
[ 16.604165][ T69] softirqs last disabled at (18763): [] irq_exit_rcu+0xab/0x100
[ 16.604448][ T69] ---[ end trace 0000000000000000 ]---