[ 15.902053][ T12] ==================================================================
[ 15.902557][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.902994][ T12] Read of size 1 at addr ffff88800e191694 by task kworker/u16:0/12
[ 15.903377][ T12]
[ 15.903528][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.903537][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.903541][ T12] Workqueue: netns cleanup_net
[ 15.903561][ T12] Call Trace:
[ 15.903567][ T12]
[ 15.903573][ T12] dump_stack_lvl+0x82/0xc0
[ 15.903584][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 15.903609][ T12] ? kobject_put+0xbb/0xd0
[ 15.903616][ T12] print_report+0xb4/0x270
[ 15.903622][ T12] ? kobject_put+0xbb/0xd0
[ 15.903627][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 15.903634][ T12] ? kobject_put+0xbb/0xd0
[ 15.903638][ T12] kasan_report+0xca/0x100
[ 15.903645][ T12] ? kobject_put+0xbb/0xd0
[ 15.903654][ T12] kobject_put+0xbb/0xd0
[ 15.903659][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.903671][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.903678][ T12] ? generic_xdp_install+0x410/0x410
[ 15.903690][ T12] ops_undo_list+0x714/0x890
[ 15.903698][ T12] ? netns_get+0x110/0x110
[ 15.903702][ T12] ? cleanup_net+0x2d6/0x830
[ 15.903711][ T12] cleanup_net+0x3b2/0x830
[ 15.903717][ T12] ? net_passive_dec+0x190/0x190
[ 15.903724][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.903742][ T12] process_one_work+0xe35/0x1650
[ 15.903763][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.903773][ T12] ? assign_work+0x168/0x240
[ 15.903780][ T12] worker_thread+0x591/0xcf0
[ 15.903791][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.903797][ T12] kthread+0x37b/0x5f0
[ 15.903805][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.903809][ T12] ? ret_from_fork+0x1b/0x270
[ 15.903827][ T12] ? __lock_release+0x5d/0x170
[ 15.903841][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.903846][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.903852][ T12] ret_from_fork+0x1db/0x270
[ 15.903857][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.903862][ T12] ret_from_fork_asm+0x11/0x20
[ 15.903882][ T12]
[ 15.903884][ T12]
[ 15.914411][ T12] Allocated by task 228:
[ 15.914623][ T12] kasan_save_stack+0x24/0x40
[ 15.914903][ T12] kasan_save_track+0x14/0x30
[ 15.915167][ T12] __kasan_kmalloc+0x7b/0x90
[ 15.915445][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.915724][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 15.916005][ T12] sit_init_net+0x169/0x550
[ 15.916286][ T12] ops_init+0x189/0x550
[ 15.916520][ T12] setup_net+0xf1/0x380
[ 15.916723][ T12] copy_net_ns+0x21a/0x380
[ 15.916989][ T12] create_new_namespaces+0x35f/0x900
[ 15.917274][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 15.917545][ T12] ksys_unshare+0x2a3/0x660
[ 15.917825][ T12] __x64_sys_unshare+0x31/0x40
[ 15.918272][ T12] do_syscall_64+0xc1/0xfd0
[ 15.918553][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.918870][ T12]
[ 15.919000][ T12] Freed by task 12:
[ 15.919208][ T12] kasan_save_stack+0x24/0x40
[ 15.919674][ T12] kasan_save_track+0x14/0x30
[ 15.919933][ T12] __kasan_save_free_info+0x3b/0x60
[ 15.920190][ T12] __kasan_slab_free+0x3f/0x60
[ 15.920468][ T12] kfree+0x21d/0x540
[ 15.920837][ T12] device_release+0x9c/0x210
[ 15.921117][ T12] kobject_cleanup+0xfe/0x360
[ 15.921378][ T12] netdev_run_todo+0x81f/0xc60
[ 15.921645][ T12] ops_undo_list+0x714/0x890
[ 15.922088][ T12] cleanup_net+0x3b2/0x830
[ 15.922343][ T12] process_one_work+0xe35/0x1650
[ 15.922601][ T12] worker_thread+0x591/0xcf0
[ 15.922856][ T12] kthread+0x37b/0x5f0
[ 15.923217][ T12] ret_from_fork+0x1db/0x270
[ 15.923496][ T12] ret_from_fork_asm+0x11/0x20
[ 15.923758][ T12]
[ 15.923896][ T12] The buggy address belongs to the object at ffff88800e191000
[ 15.923896][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 15.924701][ T12] The buggy address is located 1684 bytes inside of
[ 15.924701][ T12] freed 4096-byte region [ffff88800e191000, ffff88800e192000)
[ 15.925320][ T12]
[ 15.925599][ T12] The buggy address belongs to the physical page:
[ 15.925927][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe190
[ 15.926416][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.927004][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.927357][ T12] page_type: f5(slab)
[ 15.927632][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000369c10 ffffea0000384610
[ 15.928306][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.928822][ T12] head: 0080000000000040 ffff888001043700 ffffea0000369c10 ffffea0000384610
[ 15.929301][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.929793][ T12] head: 0080000000000003 ffffea0000386401 00000000ffffffff 00000000ffffffff
[ 15.930264][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.930904][ T12] page dumped because: kasan: bad access detected
[ 15.931224][ T12]
[ 15.931357][ T12] Memory state around the buggy address:
[ 15.931617][ T12] ffff88800e191580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.932019][ T12] ffff88800e191600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.932392][ T12] >ffff88800e191680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.932913][ T12] ^
[ 15.933164][ T12] ffff88800e191700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.933547][ T12] ffff88800e191780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.934115][ T12] ==================================================================
[ 15.935017][ T12] Disabling lock debugging due to kernel taint
[ 15.935353][ T12] ------------[ cut here ]------------
[ 15.935609][ T12] refcount_t: underflow; use-after-free.
[ 15.936121][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.936619][ T12] Modules linked in: veth
[ 15.936810][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.937394][ T12] Tainted: [B]=BAD_PAGE
[ 15.937608][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.938136][ T12] Workqueue: netns cleanup_net
[ 15.938430][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.938724][ T12] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d c5 a4 e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 15.939611][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 15.939919][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.940326][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.940714][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4abe134
[ 15.941117][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 15.941679][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.942127][ T12] FS: 0000000000000000(0000) GS:ffff88808f990000(0000) knlGS:0000000000000000
[ 15.942774][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.943108][ T12] CR2: 00007fddd04fe1a0 CR3: 000000000ec82004 CR4: 0000000000772ef0
[ 15.943528][ T12] PKRU: 55555554
[ 15.943728][ T12] Call Trace:
[ 15.943960][ T12]
[ 15.944133][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.944436][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.944706][ T12] ? generic_xdp_install+0x410/0x410
[ 15.945193][ T12] ops_undo_list+0x714/0x890
[ 15.945620][ T12] ? netns_get+0x110/0x110
[ 15.945915][ T12] ? cleanup_net+0x2d6/0x830
[ 15.946220][ T12] cleanup_net+0x3b2/0x830
[ 15.946484][ T12] ? net_passive_dec+0x190/0x190
[ 15.946931][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.947193][ T12] process_one_work+0xe35/0x1650
[ 15.947461][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.947707][ T12] ? assign_work+0x168/0x240
[ 15.948000][ T12] worker_thread+0x591/0xcf0
[ 15.948274][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.948529][ T12] kthread+0x37b/0x5f0
[ 15.948760][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.949210][ T12] ? ret_from_fork+0x1b/0x270
[ 15.949473][ T12] ? __lock_release+0x5d/0x170
[ 15.949751][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.950013][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.950425][ T12] ret_from_fork+0x1db/0x270
[ 15.950679][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.950972][ T12] ret_from_fork_asm+0x11/0x20
[ 15.951216][ T12]
[ 15.951565][ T12] irq event stamp: 3043
[ 15.951761][ T12] hardirqs last enabled at (3043): [] finish_task_switch.isra.0+0x245/0x960
[ 15.952271][ T12] hardirqs last disabled at (3042): [] __schedule+0x94a/0x1b10
[ 15.952877][ T12] softirqs last enabled at (2870): [] handle_softirqs+0x352/0x610
[ 15.953329][ T12] softirqs last disabled at (2863): [] irq_exit_rcu+0xab/0x100
[ 15.953971][ T12] ---[ end trace 0000000000000000 ]---