[ 16.110856][ T68] ==================================================================
[ 16.111276][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.111605][ T68] Read of size 1 at addr ffff8880056b4694 by task kworker/u16:1/68
[ 16.112064][ T68]
[ 16.112182][ T68] CPU: 1 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.112190][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.112195][ T68] Workqueue: netns cleanup_net
[ 16.112203][ T68] Call Trace:
[ 16.112206][ T68]
[ 16.112211][ T68] dump_stack_lvl+0x82/0xc0
[ 16.112219][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 16.112228][ T68] ? kobject_put+0xbb/0xd0
[ 16.112234][ T68] print_report+0xb4/0x270
[ 16.112240][ T68] ? kobject_put+0xbb/0xd0
[ 16.112245][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 16.112250][ T68] ? kobject_put+0xbb/0xd0
[ 16.112253][ T68] kasan_report+0xca/0x100
[ 16.112259][ T68] ? kobject_put+0xbb/0xd0
[ 16.112266][ T68] kobject_put+0xbb/0xd0
[ 16.112270][ T68] netdev_run_todo+0x5f0/0xc60
[ 16.112277][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 16.112281][ T68] ? generic_xdp_install+0x410/0x410
[ 16.112291][ T68] ops_undo_list+0x714/0x890
[ 16.112297][ T68] ? netns_get+0x110/0x110
[ 16.112299][ T68] ? cleanup_net+0x2d6/0x830
[ 16.112306][ T68] cleanup_net+0x3b2/0x830
[ 16.112310][ T68] ? net_passive_dec+0x190/0x190
[ 16.112315][ T68] ? rcu_is_watching+0x12/0xb0
[ 16.112323][ T68] process_one_work+0xe35/0x1650
[ 16.112332][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.112340][ T68] ? assign_work+0x168/0x240
[ 16.112348][ T68] worker_thread+0x591/0xcf0
[ 16.112358][ T68] ? rescuer_thread+0xd10/0xd10
[ 16.112365][ T68] kthread+0x37b/0x5f0
[ 16.112371][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.112375][ T68] ? ret_from_fork+0x1b/0x270
[ 16.112381][ T68] ? __lock_release+0x5d/0x170
[ 16.112389][ T68] ? rcu_is_watching+0x12/0xb0
[ 16.112394][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.112400][ T68] ret_from_fork+0x1db/0x270
[ 16.112404][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.112407][ T68] ret_from_fork_asm+0x11/0x20
[ 16.112421][ T68]
[ 16.112423][ T68]
[ 16.121994][ T68] Allocated by task 229:
[ 16.122184][ T68] kasan_save_stack+0x24/0x40
[ 16.122434][ T68] kasan_save_track+0x14/0x30
[ 16.122674][ T68] __kasan_kmalloc+0x7b/0x90
[ 16.122908][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.123200][ T68] alloc_netdev_mqs+0x7d/0x1310
[ 16.123438][ T68] sit_init_net+0x169/0x550
[ 16.123669][ T68] ops_init+0x189/0x550
[ 16.123849][ T68] setup_net+0xf1/0x380
[ 16.124050][ T68] copy_net_ns+0x21a/0x380
[ 16.124286][ T68] create_new_namespaces+0x35f/0x900
[ 16.124549][ T68] unshare_nsproxy_namespaces+0x89/0x120
[ 16.124788][ T68] ksys_unshare+0x2a3/0x660
[ 16.125050][ T68] __x64_sys_unshare+0x31/0x40
[ 16.125305][ T68] do_syscall_64+0xc1/0xfd0
[ 16.125568][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.125873][ T68]
[ 16.126001][ T68] Freed by task 68:
[ 16.126182][ T68] kasan_save_stack+0x24/0x40
[ 16.126431][ T68] kasan_save_track+0x14/0x30
[ 16.126661][ T68] __kasan_save_free_info+0x3b/0x60
[ 16.126927][ T68] __kasan_slab_free+0x3f/0x60
[ 16.127176][ T68] kfree+0x21d/0x540
[ 16.127366][ T68] device_release+0x9c/0x210
[ 16.127599][ T68] kobject_cleanup+0xfe/0x360
[ 16.127831][ T68] netdev_run_todo+0x81f/0xc60
[ 16.128068][ T68] ops_undo_list+0x714/0x890
[ 16.128313][ T68] cleanup_net+0x3b2/0x830
[ 16.128598][ T68] process_one_work+0xe35/0x1650
[ 16.128868][ T68] worker_thread+0x591/0xcf0
[ 16.129155][ T68] kthread+0x37b/0x5f0
[ 16.129352][ T68] ret_from_fork+0x1db/0x270
[ 16.129610][ T68] ret_from_fork_asm+0x11/0x20
[ 16.129853][ T68]
[ 16.130155][ T68] The buggy address belongs to the object at ffff8880056b4000
[ 16.130155][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 16.130735][ T68] The buggy address is located 1684 bytes inside of
[ 16.130735][ T68] freed 4096-byte region [ffff8880056b4000, ffff8880056b5000)
[ 16.131331][ T68]
[ 16.131466][ T68] The buggy address belongs to the physical page:
[ 16.131728][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56b0
[ 16.132211][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.132598][ T68] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.132959][ T68] page_type: f5(slab)
[ 16.133173][ T68] raw: 0080000000000040 ffff888001043700 ffffea00001c4e10 ffffea0000156610
[ 16.133633][ T68] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.134067][ T68] head: 0080000000000040 ffff888001043700 ffffea00001c4e10 ffffea0000156610
[ 16.134514][ T68] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.134987][ T68] head: 0080000000000003 ffffea000015ac01 00000000ffffffff 00000000ffffffff
[ 16.135459][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.135879][ T68] page dumped because: kasan: bad access detected
[ 16.136154][ T68]
[ 16.136264][ T68] Memory state around the buggy address:
[ 16.136479][ T68] ffff8880056b4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.136814][ T68] ffff8880056b4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.137139][ T68] >ffff8880056b4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.137460][ T68] ^
[ 16.137677][ T68] ffff8880056b4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.138060][ T68] ffff8880056b4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.138406][ T68] ==================================================================
[ 16.142031][ T68] Disabling lock debugging due to kernel taint
[ 16.142551][ T68] ------------[ cut here ]------------
[ 16.142881][ T68] refcount_t: underflow; use-after-free.
[ 16.143257][ T68] WARNING: CPU: 2 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.143582][ T68] Modules linked in: veth
[ 16.143738][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.144325][ T68] Tainted: [B]=BAD_PAGE
[ 16.144548][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.144784][ T68] Workqueue: netns cleanup_net
[ 16.145028][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.145270][ T68] 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 25 85 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
[ 16.145917][ T68] RSP: 0018:ffffc90000497a08 EFLAGS: 00010282
[ 16.146177][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.146515][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.146801][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0b7e134
[ 16.147109][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 16.147404][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.147665][ T68] FS: 0000000000000000(0000) GS:ffff8880af310000(0000) knlGS:0000000000000000
[ 16.148021][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.148253][ T68] CR2: 000055cd4179f45c CR3: 0000000009d6f005 CR4: 0000000000772ef0
[ 16.148519][ T68] PKRU: 55555554
[ 16.148677][ T68] Call Trace:
[ 16.148901][ T68]
[ 16.149019][ T68] netdev_run_todo+0x5f0/0xc60
[ 16.149214][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 16.149408][ T68] ? generic_xdp_install+0x410/0x410
[ 16.149589][ T68] ops_undo_list+0x714/0x890
[ 16.149785][ T68] ? netns_get+0x110/0x110
[ 16.150008][ T68] ? cleanup_net+0x2d6/0x830
[ 16.150205][ T68] cleanup_net+0x3b2/0x830
[ 16.150411][ T68] ? net_passive_dec+0x190/0x190
[ 16.150620][ T68] ? rcu_is_watching+0x12/0xb0
[ 16.150837][ T68] process_one_work+0xe35/0x1650
[ 16.151026][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.151205][ T68] ? assign_work+0x168/0x240
[ 16.151389][ T68] worker_thread+0x591/0xcf0
[ 16.151572][ T68] ? rescuer_thread+0xd10/0xd10
[ 16.151755][ T68] kthread+0x37b/0x5f0
[ 16.151974][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.152155][ T68] ? ret_from_fork+0x1b/0x270
[ 16.152331][ T68] ? __lock_release+0x5d/0x170
[ 16.152522][ T68] ? rcu_is_watching+0x12/0xb0
[ 16.152708][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.152892][ T68] ret_from_fork+0x1db/0x270
[ 16.153078][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.153246][ T68] ret_from_fork_asm+0x11/0x20
[ 16.153441][ T68]
[ 16.153585][ T68] irq event stamp: 3831
[ 16.153729][ T68] hardirqs last enabled at (3831): [] finish_task_switch.isra.0+0x245/0x960
[ 16.154078][ T68] hardirqs last disabled at (3830): [] __schedule+0x94a/0x1b10
[ 16.154376][ T68] softirqs last enabled at (2966): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 16.154744][ T68] softirqs last disabled at (2964): [] dev_mc_flush+0x54/0x90
[ 16.155077][ T68] ---[ end trace 0000000000000000 ]---