[ 29.243796][ T12] ==================================================================
[ 29.244116][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 29.244448][ T12] Read of size 1 at addr ffff888008f096c4 by task kworker/u16:0/12
[ 29.244741][ T12]
[ 29.244839][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 29.244844][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 29.244847][ T12] Workqueue: netns cleanup_net
[ 29.244855][ T12] Call Trace:
[ 29.244857][ T12]
[ 29.244860][ T12] dump_stack_lvl+0x82/0xc0
[ 29.244867][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 29.244874][ T12] ? kobject_put+0xbb/0xd0
[ 29.244877][ T12] print_report+0xb4/0x270
[ 29.244881][ T12] ? kobject_put+0xbb/0xd0
[ 29.244884][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 29.244887][ T12] ? kobject_put+0xbb/0xd0
[ 29.244890][ T12] kasan_report+0xca/0x100
[ 29.244894][ T12] ? kobject_put+0xbb/0xd0
[ 29.244899][ T12] kobject_put+0xbb/0xd0
[ 29.244903][ T12] netdev_run_todo+0x5f0/0xc60
[ 29.244908][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 29.244912][ T12] ? generic_xdp_install+0x410/0x410
[ 29.244915][ T12] ? net_generic+0xb1/0x1f0
[ 29.244926][ T12] ops_undo_list+0x714/0x890
[ 29.244931][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 29.244935][ T12] ? cleanup_net+0x2d6/0x8b0
[ 29.244941][ T12] cleanup_net+0x3b2/0x8b0
[ 29.244945][ T12] ? net_passive_dec+0x190/0x190
[ 29.244950][ T12] ? rcu_is_watching+0x12/0xb0
[ 29.244958][ T12] process_one_work+0xe35/0x1650
[ 29.244967][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 29.244972][ T12] ? assign_work+0x168/0x240
[ 29.244977][ T12] worker_thread+0x591/0xcf0
[ 29.244982][ T12] ? rescuer_thread+0xd10/0xd10
[ 29.244986][ T12] kthread+0x37b/0x5f0
[ 29.244990][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 29.244993][ T12] ? ret_from_fork+0x1b/0x270
[ 29.244998][ T12] ? __lock_release+0x5d/0x170
[ 29.245002][ T12] ? rcu_is_watching+0x12/0xb0
[ 29.245005][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 29.245009][ T12] ret_from_fork+0x1db/0x270
[ 29.245012][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 29.245015][ T12] ret_from_fork_asm+0x11/0x20
[ 29.245024][ T12]
[ 29.245025][ T12]
[ 29.252050][ T12] Allocated by task 277:
[ 29.252183][ T12] kasan_save_stack+0x24/0x40
[ 29.252387][ T12] kasan_save_track+0x14/0x30
[ 29.252567][ T12] __kasan_kmalloc+0x7b/0x90
[ 29.252745][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 29.252917][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 29.253089][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 29.253282][ T12] ops_init+0x189/0x550
[ 29.253423][ T12] setup_net+0xf1/0x380
[ 29.253564][ T12] copy_net_ns+0x253/0x510
[ 29.253742][ T12] create_new_namespaces+0x35f/0x900
[ 29.253917][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 29.254092][ T12] ksys_unshare+0x2be/0x6e0
[ 29.254293][ T12] __x64_sys_unshare+0x31/0x40
[ 29.254476][ T12] do_syscall_64+0xc1/0xfd0
[ 29.254694][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 29.254913][ T12]
[ 29.255008][ T12] Freed by task 12:
[ 29.255153][ T12] kasan_save_stack+0x24/0x40
[ 29.255341][ T12] kasan_save_track+0x14/0x30
[ 29.255521][ T12] __kasan_save_free_info+0x3b/0x60
[ 29.255708][ T12] __kasan_slab_free+0x3f/0x60
[ 29.255877][ T12] kfree+0x21d/0x540
[ 29.256014][ T12] device_release+0x9c/0x210
[ 29.256203][ T12] kobject_cleanup+0xfe/0x360
[ 29.256396][ T12] netdev_run_todo+0x81f/0xc60
[ 29.256581][ T12] ops_undo_list+0x714/0x890
[ 29.256770][ T12] cleanup_net+0x3b2/0x8b0
[ 29.256943][ T12] process_one_work+0xe35/0x1650
[ 29.257120][ T12] worker_thread+0x591/0xcf0
[ 29.257315][ T12] kthread+0x37b/0x5f0
[ 29.257446][ T12] ret_from_fork+0x1db/0x270
[ 29.257642][ T12] ret_from_fork_asm+0x11/0x20
[ 29.257817][ T12]
[ 29.257917][ T12] The buggy address belongs to the object at ffff888008f09000
[ 29.257917][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 29.258379][ T12] The buggy address is located 1732 bytes inside of
[ 29.258379][ T12] freed 4096-byte region [ffff888008f09000, ffff888008f0a000)
[ 29.258816][ T12]
[ 29.258901][ T12] The buggy address belongs to the physical page:
[ 29.259116][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8f08
[ 29.259442][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 29.259719][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 29.259939][ T12] page_type: f5(slab)
[ 29.260078][ T12] raw: 0080000000000040 ffff888001043700 ffffea000026dc10 ffffea000022d810
[ 29.260410][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 29.260728][ T12] head: 0080000000000040 ffff888001043700 ffffea000026dc10 ffffea000022d810
[ 29.261038][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 29.261369][ T12] head: 0080000000000003 ffffea000023c201 00000000ffffffff 00000000ffffffff
[ 29.261692][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 29.261998][ T12] page dumped because: kasan: bad access detected
[ 29.262225][ T12]
[ 29.262335][ T12] Memory state around the buggy address:
[ 29.262523][ T12] ffff888008f09580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 29.262786][ T12] ffff888008f09600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 29.263038][ T12] >ffff888008f09680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 29.263323][ T12] ^
[ 29.263551][ T12] ffff888008f09700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 29.263800][ T12] ffff888008f09780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 29.264047][ T12] ==================================================================
[ 29.264384][ T12] Disabling lock debugging due to kernel taint
[ 29.264845][ T12] ------------[ cut here ]------------
[ 29.265239][ T12] refcount_t: underflow; use-after-free.
[ 29.265548][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 29.266010][ T12] Modules linked in:
[ 29.266229][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 29.266827][ T12] Tainted: [B]=BAD_PAGE
[ 29.267037][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 29.267372][ T12] Workqueue: netns cleanup_net
[ 29.267651][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 29.267980][ T12] 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 8d 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
[ 29.268912][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 29.269258][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 29.269610][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 29.269979][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1d40934
[ 29.270383][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 29.270778][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 29.271165][ T12] FS: 0000000000000000(0000) GS:ffff8880dd188000(0000) knlGS:0000000000000000
[ 29.271607][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 29.271919][ T12] CR2: 0000556a235ef958 CR3: 0000000046149001 CR4: 0000000000772ef0
[ 29.272307][ T12] PKRU: 55555554
[ 29.272503][ T12] Call Trace:
[ 29.272699][ T12]
[ 29.272834][ T12] netdev_run_todo+0x5f0/0xc60
[ 29.273096][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 29.273346][ T12] ? generic_xdp_install+0x410/0x410
[ 29.273602][ T12] ? net_generic+0xb1/0x1f0
[ 29.273869][ T12] ops_undo_list+0x714/0x890
[ 29.274150][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 29.274399][ T12] ? cleanup_net+0x2d6/0x8b0
[ 29.274669][ T12] cleanup_net+0x3b2/0x8b0
[ 29.274923][ T12] ? net_passive_dec+0x190/0x190
[ 29.275195][ T12] ? rcu_is_watching+0x12/0xb0
[ 29.275460][ T12] process_one_work+0xe35/0x1650
[ 29.275732][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 29.275988][ T12] ? assign_work+0x168/0x240
[ 29.276417][ T12] worker_thread+0x591/0xcf0
[ 29.276678][ T12] ? rescuer_thread+0xd10/0xd10
[ 29.276921][ T12] kthread+0x37b/0x5f0
[ 29.277128][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 29.277539][ T12] ? ret_from_fork+0x1b/0x270
[ 29.277788][ T12] ? __lock_release+0x5d/0x170
[ 29.278099][ T12] ? rcu_is_watching+0x12/0xb0
[ 29.278290][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 29.278542][ T12] ret_from_fork+0x1db/0x270
[ 29.278709][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 29.278877][ T12] ret_from_fork_asm+0x11/0x20
[ 29.279060][ T12]
[ 29.279281][ T12] irq event stamp: 22613
[ 29.279399][ T12] hardirqs last enabled at (22613): [] finish_task_switch.isra.0+0x245/0x960
[ 29.279722][ T12] hardirqs last disabled at (22612): [] __schedule+0x94a/0x1b10
[ 29.280130][ T12] softirqs last enabled at (22354): [] handle_softirqs+0x352/0x610
[ 29.280418][ T12] softirqs last disabled at (22349): [] irq_exit_rcu+0xab/0x100
[ 29.280783][ T12] ---[ end trace 0000000000000000 ]---