[ 23.227363][ T70] ==================================================================
[ 23.227701][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 23.228042][ T70] Read of size 1 at addr ffff8880095f96c4 by task kworker/u16:1/70
[ 23.228273][ T70]
[ 23.228365][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 23.228370][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 23.228373][ T70] Workqueue: netns cleanup_net
[ 23.228381][ T70] Call Trace:
[ 23.228384][ T70]
[ 23.228387][ T70] dump_stack_lvl+0x82/0xc0
[ 23.228393][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 23.228400][ T70] ? kobject_put+0xbb/0xd0
[ 23.228404][ T70] print_report+0xb4/0x270
[ 23.228408][ T70] ? kobject_put+0xbb/0xd0
[ 23.228411][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 23.228414][ T70] ? kobject_put+0xbb/0xd0
[ 23.228417][ T70] kasan_report+0xca/0x100
[ 23.228421][ T70] ? kobject_put+0xbb/0xd0
[ 23.228427][ T70] kobject_put+0xbb/0xd0
[ 23.228430][ T70] netdev_run_todo+0x5f0/0xc60
[ 23.228435][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 23.228439][ T70] ? generic_xdp_install+0x410/0x410
[ 23.228444][ T70] ? net_generic+0xb1/0x1f0
[ 23.228452][ T70] ops_undo_list+0x714/0x890
[ 23.228458][ T70] ? rtnl_net_dumpid_one+0x270/0x270
[ 23.228461][ T70] ? cleanup_net+0x2d6/0x8b0
[ 23.228467][ T70] cleanup_net+0x3b2/0x8b0
[ 23.228472][ T70] ? net_passive_dec+0x190/0x190
[ 23.228477][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.228483][ T70] process_one_work+0xe35/0x1650
[ 23.228496][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 23.228501][ T70] ? assign_work+0x168/0x240
[ 23.228506][ T70] worker_thread+0x591/0xcf0
[ 23.228511][ T70] ? rescuer_thread+0xd10/0xd10
[ 23.228515][ T70] kthread+0x37b/0x5f0
[ 23.228519][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.228522][ T70] ? ret_from_fork+0x1b/0x270
[ 23.228526][ T70] ? __lock_release+0x5d/0x170
[ 23.228531][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.228534][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.228538][ T70] ret_from_fork+0x1db/0x270
[ 23.228540][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.228543][ T70] ret_from_fork_asm+0x11/0x20
[ 23.228557][ T70]
[ 23.228558][ T70]
[ 23.235423][ T70] Allocated by task 270:
[ 23.235565][ T70] kasan_save_stack+0x24/0x40
[ 23.235763][ T70] kasan_save_track+0x14/0x30
[ 23.235954][ T70] __kasan_kmalloc+0x7b/0x90
[ 23.236135][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 23.236311][ T70] alloc_netdev_mqs+0x7d/0x1370
[ 23.236493][ T70] ip6_tnl_init_net+0x102/0x3f0
[ 23.236673][ T70] ops_init+0x189/0x550
[ 23.236816][ T70] setup_net+0xf1/0x380
[ 23.236963][ T70] copy_net_ns+0x253/0x510
[ 23.237231][ T70] create_new_namespaces+0x35f/0x900
[ 23.237417][ T70] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 23.237602][ T70] ksys_unshare+0x2be/0x6e0
[ 23.237790][ T70] __x64_sys_unshare+0x31/0x40
[ 23.238086][ T70] do_syscall_64+0xc1/0xfd0
[ 23.238265][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 23.238490][ T70]
[ 23.238584][ T70] Freed by task 70:
[ 23.238822][ T70] kasan_save_stack+0x24/0x40
[ 23.239015][ T70] kasan_save_track+0x14/0x30
[ 23.239188][ T70] __kasan_save_free_info+0x3b/0x60
[ 23.239360][ T70] __kasan_slab_free+0x3f/0x60
[ 23.239538][ T70] kfree+0x21d/0x540
[ 23.239669][ T70] device_release+0x9c/0x210
[ 23.239870][ T70] kobject_cleanup+0xfe/0x360
[ 23.240054][ T70] netdev_run_todo+0x81f/0xc60
[ 23.240226][ T70] ops_undo_list+0x714/0x890
[ 23.240398][ T70] cleanup_net+0x3b2/0x8b0
[ 23.240578][ T70] process_one_work+0xe35/0x1650
[ 23.240763][ T70] worker_thread+0x591/0xcf0
[ 23.240949][ T70] kthread+0x37b/0x5f0
[ 23.241083][ T70] ret_from_fork+0x1db/0x270
[ 23.241259][ T70] ret_from_fork_asm+0x11/0x20
[ 23.241432][ T70]
[ 23.241530][ T70] The buggy address belongs to the object at ffff8880095f9000
[ 23.241530][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 23.241990][ T70] The buggy address is located 1732 bytes inside of
[ 23.241990][ T70] freed 4096-byte region [ffff8880095f9000, ffff8880095fa000)
[ 23.242504][ T70]
[ 23.242593][ T70] The buggy address belongs to the physical page:
[ 23.242828][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880095fc000 pfn:0x95f8
[ 23.243219][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 23.243540][ T70] flags: 0x80000000000240(workingset|head|node=0|zone=1)
[ 23.243774][ T70] page_type: f5(slab)
[ 23.243920][ T70] raw: 0080000000000240 ffff888001043700 ffffea0000390410 ffffea000032ea10
[ 23.244328][ T70] raw: ffff8880095fc000 0000000000020001 00000000f5000000 0000000000000000
[ 23.244645][ T70] head: 0080000000000240 ffff888001043700 ffffea0000390410 ffffea000032ea10
[ 23.245063][ T70] head: ffff8880095fc000 0000000000020001 00000000f5000000 0000000000000000
[ 23.245371][ T70] head: 0080000000000003 ffffea0000257e01 00000000ffffffff 00000000ffffffff
[ 23.245788][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 23.246095][ T70] page dumped because: kasan: bad access detected
[ 23.246309][ T70]
[ 23.246396][ T70] Memory state around the buggy address:
[ 23.246651][ T70] ffff8880095f9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.246920][ T70] ffff8880095f9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.247168][ T70] >ffff8880095f9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.247425][ T70] ^
[ 23.247648][ T70] ffff8880095f9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.248071][ T70] ffff8880095f9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.248379][ T70] ==================================================================
[ 23.249474][ T70] Disabling lock debugging due to kernel taint
[ 23.249718][ T70] ------------[ cut here ]------------
[ 23.249885][ T70] refcount_t: underflow; use-after-free.
[ 23.250124][ T70] WARNING: CPU: 1 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 23.250591][ T70] Modules linked in:
[ 23.250736][ T70] CPU: 1 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 23.251084][ T70] Tainted: [B]=BAD_PAGE
[ 23.251296][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 23.251545][ T70] Workqueue: netns cleanup_net
[ 23.251726][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 23.251942][ T70] 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 25 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
[ 23.252603][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 23.252815][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 23.253066][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 23.253380][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7640934
[ 23.253634][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 23.253890][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 23.254143][ T70] FS: 0000000000000000(0000) GS:ffff8880b0988000(0000) knlGS:0000000000000000
[ 23.254486][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 23.254703][ T70] CR2: 0000557375ac5dec CR3: 0000000009520006 CR4: 0000000000772ef0
[ 23.254959][ T70] PKRU: 55555554
[ 23.255083][ T70] Call Trace:
[ 23.255222][ T70]
[ 23.255310][ T70] netdev_run_todo+0x5f0/0xc60
[ 23.255483][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 23.255654][ T70] ? generic_xdp_install+0x410/0x410
[ 23.255820][ T70] ? net_generic+0xb1/0x1f0
[ 23.255994][ T70] ops_undo_list+0x714/0x890
[ 23.256167][ T70] ? rtnl_net_dumpid_one+0x270/0x270
[ 23.256343][ T70] ? cleanup_net+0x2d6/0x8b0
[ 23.256517][ T70] cleanup_net+0x3b2/0x8b0
[ 23.256684][ T70] ? net_passive_dec+0x190/0x190
[ 23.256862][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.257033][ T70] process_one_work+0xe35/0x1650
[ 23.257213][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 23.257384][ T70] ? assign_work+0x168/0x240
[ 23.257567][ T70] worker_thread+0x591/0xcf0
[ 23.257722][ T70] ? rescuer_thread+0xd10/0xd10
[ 23.257899][ T70] kthread+0x37b/0x5f0
[ 23.258020][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.258172][ T70] ? ret_from_fork+0x1b/0x270
[ 23.258336][ T70] ? __lock_release+0x5d/0x170
[ 23.258529][ T70] ? rcu_is_watching+0x12/0xb0
[ 23.258700][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.258866][ T70] ret_from_fork+0x1db/0x270
[ 23.259040][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.259214][ T70] ret_from_fork_asm+0x11/0x20
[ 23.259387][ T70]
[ 23.259519][ T70] irq event stamp: 12355
[ 23.259651][ T70] hardirqs last enabled at (12355): [] finish_task_switch.isra.0+0x245/0x960
[ 23.259991][ T70] hardirqs last disabled at (12354): [] __schedule+0x94a/0x1b10
[ 23.260302][ T70] softirqs last enabled at (12184): [] handle_softirqs+0x352/0x610
[ 23.260599][ T70] softirqs last disabled at (12175): [] irq_exit_rcu+0xab/0x100
[ 23.260887][ T70] ---[ end trace 0000000000000000 ]---