[ 16.442059][ T12] ==================================================================
[ 16.442340][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.442582][ T12] Read of size 1 at addr ffff888008c116c4 by task kworker/u16:0/12
[ 16.442875][ T12]
[ 16.442978][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.442983][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.442986][ T12] Workqueue: netns cleanup_net
[ 16.442994][ T12] Call Trace:
[ 16.442997][ T12]
[ 16.442999][ T12] dump_stack_lvl+0x82/0xc0
[ 16.443006][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.443012][ T12] ? kobject_put+0xbb/0xd0
[ 16.443016][ T12] print_report+0xb4/0x270
[ 16.443020][ T12] ? kobject_put+0xbb/0xd0
[ 16.443023][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.443026][ T12] ? kobject_put+0xbb/0xd0
[ 16.443029][ T12] kasan_report+0xca/0x100
[ 16.443033][ T12] ? kobject_put+0xbb/0xd0
[ 16.443039][ T12] kobject_put+0xbb/0xd0
[ 16.443042][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.443047][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.443051][ T12] ? generic_xdp_install+0x410/0x410
[ 16.443054][ T12] ? net_generic+0xb1/0x1f0
[ 16.443063][ T12] ops_undo_list+0x714/0x890
[ 16.443068][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.443071][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.443077][ T12] cleanup_net+0x3b2/0x8b0
[ 16.443082][ T12] ? net_passive_dec+0x190/0x190
[ 16.443086][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.443093][ T12] process_one_work+0xe35/0x1650
[ 16.443102][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.443108][ T12] ? assign_work+0x168/0x240
[ 16.443112][ T12] worker_thread+0x591/0xcf0
[ 16.443122][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.443127][ T12] kthread+0x37b/0x5f0
[ 16.443134][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.443138][ T12] ? ret_from_fork+0x1b/0x270
[ 16.443143][ T12] ? __lock_release+0x5d/0x170
[ 16.443147][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.443150][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.443154][ T12] ret_from_fork+0x1db/0x270
[ 16.443157][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.443160][ T12] ret_from_fork_asm+0x11/0x20
[ 16.443170][ T12]
[ 16.443171][ T12]
[ 16.450246][ T12] Allocated by task 258:
[ 16.450367][ T12] kasan_save_stack+0x24/0x40
[ 16.450542][ T12] kasan_save_track+0x14/0x30
[ 16.450790][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.450976][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.451142][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 16.451304][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 16.451565][ T12] ops_init+0x189/0x550
[ 16.451690][ T12] setup_net+0xf1/0x380
[ 16.451810][ T12] copy_net_ns+0x253/0x510
[ 16.451991][ T12] create_new_namespaces+0x35f/0x900
[ 16.452260][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 16.452430][ T12] ksys_unshare+0x2be/0x6e0
[ 16.452586][ T12] __x64_sys_unshare+0x31/0x40
[ 16.452747][ T12] do_syscall_64+0xc1/0xfd0
[ 16.453014][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.453223][ T12]
[ 16.453304][ T12] Freed by task 12:
[ 16.453432][ T12] kasan_save_stack+0x24/0x40
[ 16.453592][ T12] kasan_save_track+0x14/0x30
[ 16.453833][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.453996][ T12] __kasan_slab_free+0x3f/0x60
[ 16.454171][ T12] kfree+0x21d/0x540
[ 16.454290][ T12] device_release+0x9c/0x210
[ 16.454546][ T12] kobject_cleanup+0xfe/0x360
[ 16.454704][ T12] netdev_run_todo+0x81f/0xc60
[ 16.454861][ T12] ops_undo_list+0x714/0x890
[ 16.455023][ T12] cleanup_net+0x3b2/0x8b0
[ 16.455286][ T12] process_one_work+0xe35/0x1650
[ 16.455460][ T12] worker_thread+0x591/0xcf0
[ 16.455620][ T12] kthread+0x37b/0x5f0
[ 16.455740][ T12] ret_from_fork+0x1db/0x270
[ 16.456081][ T12] ret_from_fork_asm+0x11/0x20
[ 16.456252][ T12]
[ 16.456339][ T12] The buggy address belongs to the object at ffff888008c11000
[ 16.456339][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.456797][ T12] The buggy address is located 1732 bytes inside of
[ 16.456797][ T12] freed 4096-byte region [ffff888008c11000, ffff888008c12000)
[ 16.457195][ T12]
[ 16.457278][ T12] The buggy address belongs to the physical page:
[ 16.457567][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c10
[ 16.457940][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.458224][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.458521][ T12] page_type: f5(slab)
[ 16.458642][ T12] raw: 0080000000000040 ffff888001043700 ffffea000021b610 ffffea000022fc10
[ 16.459029][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.459412][ T12] head: 0080000000000040 ffff888001043700 ffffea000021b610 ffffea000022fc10
[ 16.459700][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.460071][ T12] head: 0080000000000003 ffffea0000230401 00000000ffffffff 00000000ffffffff
[ 16.460362][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.460754][ T12] page dumped because: kasan: bad access detected
[ 16.460947][ T12]
[ 16.461027][ T12] Memory state around the buggy address:
[ 16.461185][ T12] ffff888008c11580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.461443][ T12] ffff888008c11600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.461762][ T12] >ffff888008c11680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.461997][ T12] ^
[ 16.462280][ T12] ffff888008c11700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.462522][ T12] ffff888008c11780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.462834][ T12] ==================================================================
[ 16.463168][ T12] Disabling lock debugging due to kernel taint
[ 16.463381][ T12] ------------[ cut here ]------------
[ 16.463548][ T12] refcount_t: underflow; use-after-free.
[ 16.463722][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.464068][ T12] Modules linked in:
[ 16.464189][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.464589][ T12] Tainted: [B]=BAD_PAGE
[ 16.464714][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.464973][ T12] Workqueue: netns cleanup_net
[ 16.465143][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.465365][ 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 b8 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
[ 16.465995][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.466194][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.466450][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.466679][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7340934
[ 16.466973][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.467207][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.467471][ T12] FS: 0000000000000000(0000) GS:ffff8880abb08000(0000) knlGS:0000000000000000
[ 16.467896][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.468090][ T12] CR2: 00007f8d3ac51e60 CR3: 0000000075b49006 CR4: 0000000000772ef0
[ 16.468332][ T12] PKRU: 55555554
[ 16.468471][ T12] Call Trace:
[ 16.468586][ T12]
[ 16.468667][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.468888][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.469038][ T12] ? generic_xdp_install+0x410/0x410
[ 16.469191][ T12] ? net_generic+0xb1/0x1f0
[ 16.469364][ T12] ops_undo_list+0x714/0x890
[ 16.469532][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 16.469681][ T12] ? cleanup_net+0x2d6/0x8b0
[ 16.469900][ T12] cleanup_net+0x3b2/0x8b0
[ 16.470053][ T12] ? net_passive_dec+0x190/0x190
[ 16.470210][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.470364][ T12] process_one_work+0xe35/0x1650
[ 16.470545][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.470705][ T12] ? assign_work+0x168/0x240
[ 16.470912][ T12] worker_thread+0x591/0xcf0
[ 16.471149][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.471381][ T12] kthread+0x37b/0x5f0
[ 16.471513][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.471662][ T12] ? ret_from_fork+0x1b/0x270
[ 16.471872][ T12] ? __lock_release+0x5d/0x170
[ 16.472035][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.472186][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.472335][ T12] ret_from_fork+0x1db/0x270
[ 16.472484][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.472731][ T12] ret_from_fork_asm+0x11/0x20
[ 16.472947][ T12]
[ 16.473064][ T12] irq event stamp: 9267
[ 16.473176][ T12] hardirqs last enabled at (9267): [] irqentry_exit+0x3b/0x80
[ 16.473442][ T12] hardirqs last disabled at (9266): [] handle_softirqs+0x47f/0x610
[ 16.473706][ T12] softirqs last enabled at (8272): [] unregister_netdevice_many_notify+0x714/0x1c90
[ 16.474158][ T12] softirqs last disabled at (8270): [] dev_mc_flush+0x54/0x90
[ 16.474421][ T12] ---[ end trace 0000000000000000 ]---