[ 23.899320][ T70] ==================================================================
[ 23.899606][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 23.899852][ T70] Read of size 1 at addr ffff888008fa469c by task kworker/u16:1/70
[ 23.900080][ T70]
[ 23.900162][ T70] CPU: 2 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 23.900168][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 23.900171][ T70] Workqueue: netns cleanup_net
[ 23.900179][ T70] Call Trace:
[ 23.900181][ T70]
[ 23.900184][ T70] dump_stack_lvl+0x82/0xc0
[ 23.900190][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 23.900197][ T70] ? kobject_put+0xbb/0xd0
[ 23.900201][ T70] print_report+0xb4/0x270
[ 23.900204][ T70] ? kobject_put+0xbb/0xd0
[ 23.900207][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 23.900211][ T70] ? kobject_put+0xbb/0xd0
[ 23.900214][ T70] kasan_report+0xca/0x100
[ 23.900222][ T70] ? kobject_put+0xbb/0xd0
[ 23.900228][ T70] kobject_put+0xbb/0xd0
[ 23.900231][ T70] netdev_run_todo+0x5f0/0xc60
[ 23.900237][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 23.900240][ T70] ? generic_xdp_install+0x410/0x410
[ 23.900246][ T70] ops_undo_list+0x714/0x890
[ 23.900251][ T70] ? netns_get+0x110/0x110
[ 23.900254][ T70] ? cleanup_net+0x2d6/0x830
[ 23.900259][ T70] cleanup_net+0x3b2/0x830
[ 23.900263][ T70] ? net_passive_dec+0x190/0x190
[ 23.900267][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.900276][ T70] process_one_work+0xe35/0x1650
[ 23.900286][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 23.900291][ T70] ? assign_work+0x168/0x240
[ 23.900296][ T70] worker_thread+0x591/0xcf0
[ 23.900302][ T70] ? rescuer_thread+0xd10/0xd10
[ 23.900306][ T70] kthread+0x37b/0x5f0
[ 23.900311][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.900314][ T70] ? ret_from_fork+0x1b/0x270
[ 23.900319][ T70] ? __lock_release+0x5d/0x170
[ 23.900325][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.900329][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.900333][ T70] ret_from_fork+0x1db/0x270
[ 23.900335][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.900339][ T70] ret_from_fork_asm+0x11/0x20
[ 23.900350][ T70]
[ 23.900352][ T70]
[ 23.906476][ T70] Allocated by task 313:
[ 23.906628][ T70] kasan_save_stack+0x24/0x40
[ 23.906799][ T70] kasan_save_track+0x14/0x30
[ 23.906958][ T70] __kasan_kmalloc+0x7b/0x90
[ 23.907117][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 23.907276][ T70] alloc_netdev_mqs+0x7d/0x1370
[ 23.907430][ T70] sit_init_net+0x169/0x550
[ 23.907606][ T70] ops_init+0x189/0x550
[ 23.907726][ T70] setup_net+0xf1/0x380
[ 23.907843][ T70] copy_net_ns+0x21a/0x380
[ 23.908000][ T70] create_new_namespaces+0x35f/0x900
[ 23.908160][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 23.908318][ T70] ksys_unshare+0x2a3/0x660
[ 23.908488][ T70] __x64_sys_unshare+0x31/0x40
[ 23.908656][ T70] do_syscall_64+0xc1/0xfd0
[ 23.908819][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 23.909012][ T70]
[ 23.909091][ T70] Freed by task 70:
[ 23.909209][ T70] kasan_save_stack+0x24/0x40
[ 23.909369][ T70] kasan_save_track+0x14/0x30
[ 23.909533][ T70] __kasan_save_free_info+0x3b/0x60
[ 23.909698][ T70] __kasan_slab_free+0x3f/0x60
[ 23.909853][ T70] kfree+0x21d/0x540
[ 23.909972][ T70] device_release+0x9c/0x210
[ 23.910129][ T70] kobject_cleanup+0xfe/0x360
[ 23.910284][ T70] netdev_run_todo+0x81f/0xc60
[ 23.910443][ T70] ops_undo_list+0x714/0x890
[ 23.910608][ T70] cleanup_net+0x3b2/0x830
[ 23.910860][ T70] process_one_work+0xe35/0x1650
[ 23.911016][ T70] worker_thread+0x591/0xcf0
[ 23.911171][ T70] kthread+0x37b/0x5f0
[ 23.911298][ T70] ret_from_fork+0x1db/0x270
[ 23.911449][ T70] ret_from_fork_asm+0x11/0x20
[ 23.911612][ T70]
[ 23.911695][ T70] The buggy address belongs to the object at ffff888008fa4000
[ 23.911695][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 23.912075][ T70] The buggy address is located 1692 bytes inside of
[ 23.912075][ T70] freed 4096-byte region [ffff888008fa4000, ffff888008fa5000)
[ 23.912474][ T70]
[ 23.912645][ T70] The buggy address belongs to the physical page:
[ 23.912837][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8fa0
[ 23.913210][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 23.913550][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 23.913754][ T70] page_type: f5(slab)
[ 23.913883][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000204610 ffffea0000168a10
[ 23.914260][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 23.914541][ T70] head: 0080000000000040 ffff888001043700 ffffea0000204610 ffffea0000168a10
[ 23.914919][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 23.915200][ T70] head: 0080000000000003 ffffea000023e801 00000000ffffffff 00000000ffffffff
[ 23.915479][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 23.915776][ T70] page dumped because: kasan: bad access detected
[ 23.915977][ T70]
[ 23.916138][ T70] Memory state around the buggy address:
[ 23.916288][ T70] ffff888008fa4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.916521][ T70] ffff888008fa4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.916752][ T70] >ffff888008fa4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.917072][ T70] ^
[ 23.917226][ T70] ffff888008fa4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.917460][ T70] ffff888008fa4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.917697][ T70] ==================================================================
[ 23.918020][ T70] Disabling lock debugging due to kernel taint
[ 23.918279][ T70] ------------[ cut here ]------------
[ 23.918435][ T70] refcount_t: underflow; use-after-free.
[ 23.918626][ T70] WARNING: CPU: 3 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 23.918924][ T70] Modules linked in:
[ 23.919057][ T70] CPU: 3 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 23.919433][ T70] Tainted: [B]=BAD_PAGE
[ 23.919577][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 23.919815][ T70] Workqueue: netns cleanup_net
[ 23.920007][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 23.920253][ T70] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d a5 b5 e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 23.920898][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 23.921110][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 23.921364][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 23.921609][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6c82934
[ 23.921867][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 23.922129][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 23.922395][ T70] FS: 0000000000000000(0000) GS:ffff888078d04000(0000) knlGS:0000000000000000
[ 23.922706][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 23.922930][ T70] CR2: 00007ffe983cf868 CR3: 0000000008a52002 CR4: 0000000000772ef0
[ 23.923202][ T70] PKRU: 55555554
[ 23.923348][ T70] Call Trace:
[ 23.923485][ T70]
[ 23.923581][ T70] netdev_run_todo+0x5f0/0xc60
[ 23.923857][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 23.924039][ T70] ? generic_xdp_install+0x410/0x410
[ 23.924215][ T70] ops_undo_list+0x714/0x890
[ 23.924405][ T70] ? netns_get+0x110/0x110
[ 23.924666][ T70] ? cleanup_net+0x2d6/0x830
[ 23.924862][ T70] cleanup_net+0x3b2/0x830
[ 23.925046][ T70] ? net_passive_dec+0x190/0x190
[ 23.925232][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.925422][ T70] process_one_work+0xe35/0x1650
[ 23.925611][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 23.925803][ T70] ? assign_work+0x168/0x240
[ 23.925985][ T70] worker_thread+0x591/0xcf0
[ 23.926260][ T70] ? rescuer_thread+0xd10/0xd10
[ 23.926450][ T70] kthread+0x37b/0x5f0
[ 23.926591][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.926778][ T70] ? ret_from_fork+0x1b/0x270
[ 23.927052][ T70] ? __lock_release+0x5d/0x170
[ 23.927243][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.927424][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.927609][ T70] ret_from_fork+0x1db/0x270
[ 23.927967][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.928242][ T70] ret_from_fork_asm+0x11/0x20
[ 23.928424][ T70]
[ 23.928555][ T70] irq event stamp: 8663
[ 23.928779][ T70] hardirqs last enabled at (8663): [] finish_task_switch.isra.0+0x245/0x960
[ 23.929135][ T70] hardirqs last disabled at (8662): [] __schedule+0x94a/0x1b10
[ 23.929451][ T70] softirqs last enabled at (8568): [] handle_softirqs+0x352/0x610
[ 23.929835][ T70] softirqs last disabled at (8559): [] irq_exit_rcu+0xab/0x100
[ 23.930147][ T70] ---[ end trace 0000000000000000 ]---
[ 29.802573][ T382] netem: version 1.3