[ 17.359507][ T12] ==================================================================
[ 17.359937][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 17.360364][ T12] Read of size 1 at addr ffff88800af816c4 by task kworker/u16:0/12
[ 17.360768][ T12]
[ 17.360962][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.360971][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.360976][ T12] Workqueue: netns cleanup_net
[ 17.360995][ T12] Call Trace:
[ 17.360999][ T12]
[ 17.361003][ T12] dump_stack_lvl+0x82/0xc0
[ 17.361013][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 17.361024][ T12] ? kobject_put+0xbb/0xd0
[ 17.361031][ T12] print_report+0xb4/0x270
[ 17.361039][ T12] ? kobject_put+0xbb/0xd0
[ 17.361044][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 17.361050][ T12] ? kobject_put+0xbb/0xd0
[ 17.361055][ T12] kasan_report+0xca/0x100
[ 17.361063][ T12] ? kobject_put+0xbb/0xd0
[ 17.361073][ T12] kobject_put+0xbb/0xd0
[ 17.361079][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.361088][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.361093][ T12] ? generic_xdp_install+0x410/0x410
[ 17.361098][ T12] ? net_generic+0xb1/0x1f0
[ 17.361119][ T12] ops_undo_list+0x714/0x890
[ 17.361129][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 17.361134][ T12] ? cleanup_net+0x2d6/0x8b0
[ 17.361145][ T12] cleanup_net+0x3b2/0x8b0
[ 17.361152][ T12] ? net_passive_dec+0x190/0x190
[ 17.361160][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.361174][ T12] process_one_work+0xe35/0x1650
[ 17.361190][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.361199][ T12] ? assign_work+0x168/0x240
[ 17.361206][ T12] worker_thread+0x591/0xcf0
[ 17.361216][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.361223][ T12] kthread+0x37b/0x5f0
[ 17.361231][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.361235][ T12] ? ret_from_fork+0x1b/0x270
[ 17.361242][ T12] ? __lock_release+0x5d/0x170
[ 17.361253][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.361258][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.361265][ T12] ret_from_fork+0x1db/0x270
[ 17.361269][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.361274][ T12] ret_from_fork_asm+0x11/0x20
[ 17.361293][ T12]
[ 17.361296][ T12]
[ 17.371697][ T12] Allocated by task 268:
[ 17.371909][ T12] kasan_save_stack+0x24/0x40
[ 17.372200][ T12] kasan_save_track+0x14/0x30
[ 17.372455][ T12] __kasan_kmalloc+0x7b/0x90
[ 17.372729][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 17.372985][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 17.373248][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 17.373501][ T12] ops_init+0x189/0x550
[ 17.373702][ T12] setup_net+0xf1/0x380
[ 17.373906][ T12] copy_net_ns+0x253/0x510
[ 17.374154][ T12] create_new_namespaces+0x35f/0x900
[ 17.374409][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 17.374667][ T12] ksys_unshare+0x2be/0x6e0
[ 17.374951][ T12] __x64_sys_unshare+0x31/0x40
[ 17.375214][ T12] do_syscall_64+0xc1/0xfd0
[ 17.375502][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.375826][ T12]
[ 17.375960][ T12] Freed by task 12:
[ 17.376159][ T12] kasan_save_stack+0x24/0x40
[ 17.376419][ T12] kasan_save_track+0x14/0x30
[ 17.376682][ T12] __kasan_save_free_info+0x3b/0x60
[ 17.376955][ T12] __kasan_slab_free+0x3f/0x60
[ 17.377216][ T12] kfree+0x21d/0x540
[ 17.377405][ T12] device_release+0x9c/0x210
[ 17.377667][ T12] kobject_cleanup+0xfe/0x360
[ 17.377932][ T12] netdev_run_todo+0x81f/0xc60
[ 17.378368][ T12] ops_undo_list+0x714/0x890
[ 17.378630][ T12] cleanup_net+0x3b2/0x8b0
[ 17.378884][ T12] process_one_work+0xe35/0x1650
[ 17.379170][ T12] worker_thread+0x591/0xcf0
[ 17.379592][ T12] kthread+0x37b/0x5f0
[ 17.379799][ T12] ret_from_fork+0x1db/0x270
[ 17.380072][ T12] ret_from_fork_asm+0x11/0x20
[ 17.380340][ T12]
[ 17.380626][ T12] The buggy address belongs to the object at ffff88800af81000
[ 17.380626][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 17.381247][ T12] The buggy address is located 1732 bytes inside of
[ 17.381247][ T12] freed 4096-byte region [ffff88800af81000, ffff88800af82000)
[ 17.382020][ T12]
[ 17.382148][ T12] The buggy address belongs to the physical page:
[ 17.382467][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xaf80
[ 17.383118][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 17.383520][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 17.383849][ T12] page_type: f5(slab)
[ 17.384215][ T12] raw: 0080000000000040 ffff888001043700 ffffea000016a210 ffffea00002c4c10
[ 17.384690][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.385163][ T12] head: 0080000000000040 ffff888001043700 ffffea000016a210 ffffea00002c4c10
[ 17.385832][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.386289][ T12] head: 0080000000000003 ffffea00002be001 00000000ffffffff 00000000ffffffff
[ 17.386946][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 17.387425][ T12] page dumped because: kasan: bad access detected
[ 17.387771][ T12]
[ 17.388057][ T12] Memory state around the buggy address:
[ 17.388303][ T12] ffff88800af81580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.388682][ T12] ffff88800af81600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.389207][ T12] >ffff88800af81680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.389589][ T12] ^
[ 17.389912][ T12] ffff88800af81700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.390296][ T12] ffff88800af81780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.390669][ T12] ==================================================================
[ 17.391322][ T12] Disabling lock debugging due to kernel taint
[ 17.391586][ T12] ------------[ cut here ]------------
[ 17.391746][ T12] refcount_t: underflow; use-after-free.
[ 17.391951][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.392773][ T12] Modules linked in:
[ 17.392916][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.393327][ T12] Tainted: [B]=BAD_PAGE
[ 17.393457][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.393665][ T12] Workqueue: netns cleanup_net
[ 17.393844][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.394075][ 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 65 96 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
[ 17.394657][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 17.394872][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.395119][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.395378][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2ec0934
[ 17.395662][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 17.395919][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.396187][ T12] FS: 0000000000000000(0000) GS:ffff8880d4508000(0000) knlGS:0000000000000000
[ 17.396469][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.396695][ T12] CR2: 00007fffccc5ac48 CR3: 000000000a262005 CR4: 0000000000772ef0
[ 17.396948][ T12] PKRU: 55555554
[ 17.397085][ T12] Call Trace:
[ 17.397234][ T12]
[ 17.397331][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.397538][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.397704][ T12] ? generic_xdp_install+0x410/0x410
[ 17.397876][ T12] ? net_generic+0xb1/0x1f0
[ 17.398034][ T12] ops_undo_list+0x714/0x890
[ 17.398219][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 17.398388][ T12] ? cleanup_net+0x2d6/0x8b0
[ 17.398548][ T12] cleanup_net+0x3b2/0x8b0
[ 17.398706][ T12] ? net_passive_dec+0x190/0x190
[ 17.398873][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.399033][ T12] process_one_work+0xe35/0x1650
[ 17.399220][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.399389][ T12] ? assign_work+0x168/0x240
[ 17.399551][ T12] worker_thread+0x591/0xcf0
[ 17.399712][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.399884][ T12] kthread+0x37b/0x5f0
[ 17.400012][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.400190][ T12] ? ret_from_fork+0x1b/0x270
[ 17.400355][ T12] ? __lock_release+0x5d/0x170
[ 17.400533][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.400701][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.400866][ T12] ret_from_fork+0x1db/0x270
[ 17.401049][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.401234][ T12] ret_from_fork_asm+0x11/0x20
[ 17.401423][ T12]
[ 17.401545][ T12] irq event stamp: 9483
[ 17.401663][ T12] hardirqs last enabled at (9483): [] finish_task_switch.isra.0+0x245/0x960
[ 17.401983][ T12] hardirqs last disabled at (9482): [] __schedule+0x94a/0x1b10
[ 17.402290][ T12] softirqs last enabled at (9308): [] handle_softirqs+0x352/0x610
[ 17.402607][ T12] softirqs last disabled at (8389): [] irq_exit_rcu+0xab/0x100
[ 17.402917][ T12] ---[ end trace 0000000000000000 ]---