[ 16.583710][ T12] ==================================================================
[ 16.583999][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.584261][ T12] Read of size 1 at addr ffff888009e1c6c4 by task kworker/u16:0/12
[ 16.584511][ T12]
[ 16.584599][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.584604][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.584607][ T12] Workqueue: netns cleanup_net
[ 16.584616][ T12] Call Trace:
[ 16.584619][ T12]
[ 16.584622][ T12] dump_stack_lvl+0x82/0xc0
[ 16.584627][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.584635][ T12] ? kobject_put+0xbb/0xd0
[ 16.584639][ T12] print_report+0xb4/0x270
[ 16.584643][ T12] ? kobject_put+0xbb/0xd0
[ 16.584646][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.584650][ T12] ? kobject_put+0xbb/0xd0
[ 16.584653][ T12] kasan_report+0xca/0x100
[ 16.584657][ T12] ? kobject_put+0xbb/0xd0
[ 16.584662][ T12] kobject_put+0xbb/0xd0
[ 16.584666][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.584672][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.584676][ T12] ? generic_xdp_install+0x410/0x410
[ 16.584679][ T12] ? net_generic+0xb1/0x1f0
[ 16.584688][ T12] ops_undo_list+0x714/0x890
[ 16.584694][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.584697][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.584703][ T12] cleanup_net+0x3b2/0x8b0
[ 16.584707][ T12] ? net_passive_dec+0x190/0x190
[ 16.584712][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.584720][ T12] process_one_work+0xe35/0x1650
[ 16.584730][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.584736][ T12] ? assign_work+0x168/0x240
[ 16.584740][ T12] worker_thread+0x591/0xcf0
[ 16.584746][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.584750][ T12] kthread+0x37b/0x5f0
[ 16.584754][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.584757][ T12] ? ret_from_fork+0x1b/0x270
[ 16.584762][ T12] ? __lock_release+0x5d/0x170
[ 16.584767][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.584770][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.584774][ T12] ret_from_fork+0x1db/0x270
[ 16.584776][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.584780][ T12] ret_from_fork_asm+0x11/0x20
[ 16.584790][ T12]
[ 16.584792][ T12]
[ 16.591337][ T12] Allocated by task 274:
[ 16.591463][ T12] kasan_save_stack+0x24/0x40
[ 16.591638][ T12] kasan_save_track+0x14/0x30
[ 16.591802][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.591968][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.592141][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 16.592312][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 16.592489][ T12] ops_init+0x189/0x550
[ 16.592621][ T12] setup_net+0xf1/0x380
[ 16.592747][ T12] copy_net_ns+0x253/0x510
[ 16.592913][ T12] create_new_namespaces+0x35f/0x900
[ 16.593170][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 16.593338][ T12] ksys_unshare+0x2be/0x6e0
[ 16.593516][ T12] __x64_sys_unshare+0x31/0x40
[ 16.593680][ T12] do_syscall_64+0xc1/0xfd0
[ 16.593935][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.594142][ T12]
[ 16.594227][ T12] Freed by task 12:
[ 16.594352][ T12] kasan_save_stack+0x24/0x40
[ 16.594523][ T12] kasan_save_track+0x14/0x30
[ 16.594776][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.594949][ T12] __kasan_slab_free+0x3f/0x60
[ 16.595119][ T12] kfree+0x21d/0x540
[ 16.595246][ T12] device_release+0x9c/0x210
[ 16.595418][ T12] kobject_cleanup+0xfe/0x360
[ 16.595591][ T12] netdev_run_todo+0x81f/0xc60
[ 16.595757][ T12] ops_undo_list+0x714/0x890
[ 16.595921][ T12] cleanup_net+0x3b2/0x8b0
[ 16.596174][ T12] process_one_work+0xe35/0x1650
[ 16.596342][ T12] worker_thread+0x591/0xcf0
[ 16.596516][ T12] kthread+0x37b/0x5f0
[ 16.596641][ T12] ret_from_fork+0x1db/0x270
[ 16.596895][ T12] ret_from_fork_asm+0x11/0x20
[ 16.597060][ T12]
[ 16.597143][ T12] The buggy address belongs to the object at ffff888009e1c000
[ 16.597143][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.597628][ T12] The buggy address is located 1732 bytes inside of
[ 16.597628][ T12] freed 4096-byte region [ffff888009e1c000, ffff888009e1d000)
[ 16.598044][ T12]
[ 16.598136][ T12] The buggy address belongs to the physical page:
[ 16.598442][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9e18
[ 16.598769][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.599041][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.599346][ T12] page_type: f5(slab)
[ 16.599481][ T12] raw: 0080000000000040 ffff888001043700 ffffea000013b210 ffffea0000277010
[ 16.599785][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.600178][ T12] head: 0080000000000040 ffff888001043700 ffffea000013b210 ffffea0000277010
[ 16.600490][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.600882][ T12] head: 0080000000000003 ffffea0000278601 00000000ffffffff 00000000ffffffff
[ 16.601177][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.601569][ T12] page dumped because: kasan: bad access detected
[ 16.601772][ T12]
[ 16.601859][ T12] Memory state around the buggy address:
[ 16.602020][ T12] ffff888009e1c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.602352][ T12] ffff888009e1c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.602600][ T12] >ffff888009e1c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.602846][ T12] ^
[ 16.603137][ T12] ffff888009e1c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.603377][ T12] ffff888009e1c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.603621][ T12] ==================================================================
[ 16.604048][ T12] Disabling lock debugging due to kernel taint
[ 16.604290][ T12] ------------[ cut here ]------------
[ 16.604473][ T12] refcount_t: underflow; use-after-free.
[ 16.604671][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.604969][ T12] Modules linked in:
[ 16.605108][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.605508][ T12] Tainted: [B]=BAD_PAGE
[ 16.605643][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.605854][ T12] Workqueue: netns cleanup_net
[ 16.606032][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.606251][ 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 ad 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
[ 16.606858][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.607069][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.607333][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.607584][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5d40934
[ 16.607836][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.608090][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.608360][ T12] FS: 0000000000000000(0000) GS:ffff8880b6b08000(0000) knlGS:0000000000000000
[ 16.608659][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.608874][ T12] CR2: 00007f95f8fb4000 CR3: 0000000079f49003 CR4: 0000000000772ef0
[ 16.609129][ T12] PKRU: 55555554
[ 16.609266][ T12] Call Trace:
[ 16.609404][ T12]
[ 16.609491][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.609665][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.609841][ T12] ? generic_xdp_install+0x410/0x410
[ 16.610006][ T12] ? net_generic+0xb1/0x1f0
[ 16.610186][ T12] ops_undo_list+0x714/0x890
[ 16.610365][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.610526][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.610695][ T12] cleanup_net+0x3b2/0x8b0
[ 16.610865][ T12] ? net_passive_dec+0x190/0x190
[ 16.611033][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.611203][ T12] process_one_work+0xe35/0x1650
[ 16.611382][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.611554][ T12] ? assign_work+0x168/0x240
[ 16.611720][ T12] worker_thread+0x591/0xcf0
[ 16.611880][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.612045][ T12] kthread+0x37b/0x5f0
[ 16.612175][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.612352][ T12] ? ret_from_fork+0x1b/0x270
[ 16.612518][ T12] ? __lock_release+0x5d/0x170
[ 16.612688][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.612862][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.613030][ T12] ret_from_fork+0x1db/0x270
[ 16.613203][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.613382][ T12] ret_from_fork_asm+0x11/0x20
[ 16.613554][ T12]
[ 16.613680][ T12] irq event stamp: 15965
[ 16.613810][ T12] hardirqs last enabled at (15965): [] finish_task_switch.isra.0+0x245/0x960
[ 16.614154][ T12] hardirqs last disabled at (15964): [] __schedule+0x94a/0x1b10
[ 16.614457][ T12] softirqs last enabled at (15256): [] handle_softirqs+0x352/0x610
[ 16.614747][ T12] softirqs last disabled at (13457): [] irq_exit_rcu+0xab/0x100
[ 16.615036][ T12] ---[ end trace 0000000000000000 ]---
[ 58.338864][ T473] ip (473) used greatest stack depth: 24592 bytes left