[ 16.702228][ T70] ==================================================================
[ 16.702702][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.703114][ T70] Read of size 1 at addr ffff888008101694 by task kworker/u16:1/70
[ 16.703499][ T70]
[ 16.703683][ T70] CPU: 2 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.703703][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.703707][ T70] Workqueue: netns cleanup_net
[ 16.703720][ T70] Call Trace:
[ 16.703725][ T70]
[ 16.703729][ T70] dump_stack_lvl+0x82/0xc0
[ 16.703742][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 16.703757][ T70] ? kobject_put+0xbb/0xd0
[ 16.703764][ T70] print_report+0xb4/0x270
[ 16.703770][ T70] ? kobject_put+0xbb/0xd0
[ 16.703774][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 16.703781][ T70] ? kobject_put+0xbb/0xd0
[ 16.703786][ T70] kasan_report+0xca/0x100
[ 16.703793][ T70] ? kobject_put+0xbb/0xd0
[ 16.703803][ T70] kobject_put+0xbb/0xd0
[ 16.703808][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.703818][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.703824][ T70] ? generic_xdp_install+0x410/0x410
[ 16.703837][ T70] ops_undo_list+0x714/0x890
[ 16.703845][ T70] ? netns_get+0x110/0x110
[ 16.703848][ T70] ? cleanup_net+0x2d6/0x830
[ 16.703858][ T70] cleanup_net+0x3b2/0x830
[ 16.703865][ T70] ? net_passive_dec+0x190/0x190
[ 16.703871][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.703883][ T70] process_one_work+0xe35/0x1650
[ 16.703898][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.703907][ T70] ? assign_work+0x168/0x240
[ 16.703918][ T70] worker_thread+0x591/0xcf0
[ 16.703927][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.703933][ T70] kthread+0x37b/0x5f0
[ 16.703939][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.703943][ T70] ? ret_from_fork+0x1b/0x270
[ 16.703953][ T70] ? __lock_release+0x5d/0x170
[ 16.703963][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.703968][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.703974][ T70] ret_from_fork+0x1db/0x270
[ 16.703979][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.703984][ T70] ret_from_fork_asm+0x11/0x20
[ 16.704003][ T70]
[ 16.704005][ T70]
[ 16.714015][ T70] Allocated by task 227:
[ 16.714214][ T70] kasan_save_stack+0x24/0x40
[ 16.714497][ T70] kasan_save_track+0x14/0x30
[ 16.714769][ T70] __kasan_kmalloc+0x7b/0x90
[ 16.715030][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.715303][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 16.715573][ T70] sit_init_net+0x169/0x550
[ 16.715863][ T70] ops_init+0x189/0x550
[ 16.716058][ T70] setup_net+0xf1/0x380
[ 16.716260][ T70] copy_net_ns+0x21a/0x380
[ 16.716518][ T70] create_new_namespaces+0x35f/0x900
[ 16.716813][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 16.717094][ T70] ksys_unshare+0x2a3/0x660
[ 16.717348][ T70] __x64_sys_unshare+0x31/0x40
[ 16.717620][ T70] do_syscall_64+0xc1/0xfd0
[ 16.717887][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.718207][ T70]
[ 16.718367][ T70] Freed by task 70:
[ 16.718558][ T70] kasan_save_stack+0x24/0x40
[ 16.718837][ T70] kasan_save_track+0x14/0x30
[ 16.719122][ T70] __kasan_save_free_info+0x3b/0x60
[ 16.719424][ T70] __kasan_slab_free+0x3f/0x60
[ 16.719712][ T70] kfree+0x21d/0x540
[ 16.719940][ T70] device_release+0x9c/0x210
[ 16.720243][ T70] kobject_cleanup+0xfe/0x360
[ 16.720509][ T70] netdev_run_todo+0x81f/0xc60
[ 16.720776][ T70] ops_undo_list+0x714/0x890
[ 16.721086][ T70] cleanup_net+0x3b2/0x830
[ 16.721359][ T70] process_one_work+0xe35/0x1650
[ 16.721640][ T70] worker_thread+0x591/0xcf0
[ 16.721910][ T70] kthread+0x37b/0x5f0
[ 16.722111][ T70] ret_from_fork+0x1db/0x270
[ 16.722381][ T70] ret_from_fork_asm+0x11/0x20
[ 16.722651][ T70]
[ 16.722819][ T70] The buggy address belongs to the object at ffff888008101000
[ 16.722819][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 16.723565][ T70] The buggy address is located 1684 bytes inside of
[ 16.723565][ T70] freed 4096-byte region [ffff888008101000, ffff888008102000)
[ 16.724245][ T70]
[ 16.724417][ T70] The buggy address belongs to the physical page:
[ 16.724741][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8100
[ 16.725235][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.725667][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.726039][ T70] page_type: f5(slab)
[ 16.726251][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000221e10 ffffea00001f1a10
[ 16.726733][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.727262][ T70] head: 0080000000000040 ffff888001043700 ffffea0000221e10 ffffea00001f1a10
[ 16.727764][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.728257][ T70] head: 0080000000000003 ffffea0000204001 00000000ffffffff 00000000ffffffff
[ 16.728749][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.729261][ T70] page dumped because: kasan: bad access detected
[ 16.729613][ T70]
[ 16.729747][ T70] Memory state around the buggy address:
[ 16.729999][ T70] ffff888008101580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.730455][ T70] ffff888008101600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.730845][ T70] >ffff888008101680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.731223][ T70] ^
[ 16.731490][ T70] ffff888008101700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.731860][ T70] ffff888008101780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.732215][ T70] ==================================================================
[ 16.732828][ T70] Disabling lock debugging due to kernel taint
[ 16.733550][ T70] ------------[ cut here ]------------
[ 16.733845][ T70] refcount_t: underflow; use-after-free.
[ 16.734181][ T70] WARNING: CPU: 2 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.734658][ T70] Modules linked in: veth
[ 16.734892][ T70] CPU: 2 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.735511][ T70] Tainted: [B]=BAD_PAGE
[ 16.735741][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.736113][ T70] Workqueue: netns cleanup_net
[ 16.736413][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.736769][ T70] 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 05 bc 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
[ 16.737729][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 16.738102][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.738509][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.738922][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff793e134
[ 16.739353][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 16.739767][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.740192][ T70] FS: 0000000000000000(0000) GS:ffff888078510000(0000) knlGS:0000000000000000
[ 16.740670][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.741038][ T70] CR2: 00007f49901d51a0 CR3: 000000000c8fa002 CR4: 0000000000772ef0
[ 16.741453][ T70] PKRU: 55555554
[ 16.741680][ T70] Call Trace:
[ 16.741908][ T70]
[ 16.742076][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.742364][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.742647][ T70] ? generic_xdp_install+0x410/0x410
[ 16.742938][ T70] ops_undo_list+0x714/0x890
[ 16.743233][ T70] ? netns_get+0x110/0x110
[ 16.743508][ T70] ? cleanup_net+0x2d6/0x830
[ 16.743812][ T70] cleanup_net+0x3b2/0x830
[ 16.744105][ T70] ? net_passive_dec+0x190/0x190
[ 16.744391][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.744681][ T70] process_one_work+0xe35/0x1650
[ 16.744982][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.745302][ T70] ? assign_work+0x168/0x240
[ 16.745595][ T70] worker_thread+0x591/0xcf0
[ 16.745933][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.746264][ T70] kthread+0x37b/0x5f0
[ 16.746498][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.746959][ T70] ? ret_from_fork+0x1b/0x270
[ 16.747436][ T70] ? __lock_release+0x5d/0x170
[ 16.747851][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.748327][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.748746][ T70] ret_from_fork+0x1db/0x270
[ 16.749150][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.749540][ T70] ret_from_fork_asm+0x11/0x20
[ 16.749937][ T70]
[ 16.750448][ T70] irq event stamp: 2785
[ 16.750796][ T70] hardirqs last enabled at (2785): [] finish_task_switch.isra.0+0x245/0x960
[ 16.751483][ T70] hardirqs last disabled at (2784): [] __schedule+0x94a/0x1b10
[ 16.752294][ T70] softirqs last enabled at (2698): [] handle_softirqs+0x352/0x610
[ 16.752887][ T70] softirqs last disabled at (2693): [] irq_exit_rcu+0xab/0x100
[ 16.753523][ T70] ---[ end trace 0000000000000000 ]---