[ 14.633100][ T71] ==================================================================
[ 14.633401][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.633655][ T71] Read of size 1 at addr ffff888006121694 by task kworker/u16:1/71
[ 14.633918][ T71]
[ 14.634027][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.634032][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.634035][ T71] Workqueue: netns cleanup_net
[ 14.634042][ T71] Call Trace:
[ 14.634044][ T71]
[ 14.634046][ T71] dump_stack_lvl+0x82/0xc0
[ 14.634052][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 14.634059][ T71] ? kobject_put+0xbb/0xd0
[ 14.634063][ T71] print_report+0xb4/0x270
[ 14.634067][ T71] ? kobject_put+0xbb/0xd0
[ 14.634069][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 14.634073][ T71] ? kobject_put+0xbb/0xd0
[ 14.634076][ T71] kasan_report+0xca/0x100
[ 14.634081][ T71] ? kobject_put+0xbb/0xd0
[ 14.634086][ T71] kobject_put+0xbb/0xd0
[ 14.634089][ T71] netdev_run_todo+0x5f0/0xc60
[ 14.634094][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 14.634098][ T71] ? generic_xdp_install+0x410/0x410
[ 14.634105][ T71] ops_undo_list+0x714/0x890
[ 14.634109][ T71] ? netns_get+0x110/0x110
[ 14.634111][ T71] ? cleanup_net+0x2d6/0x830
[ 14.634116][ T71] cleanup_net+0x3b2/0x830
[ 14.634119][ T71] ? net_passive_dec+0x190/0x190
[ 14.634122][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.634128][ T71] process_one_work+0xe35/0x1650
[ 14.634135][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.634140][ T71] ? assign_work+0x168/0x240
[ 14.634145][ T71] worker_thread+0x591/0xcf0
[ 14.634154][ T71] ? rescuer_thread+0xd10/0xd10
[ 14.634159][ T71] kthread+0x37b/0x5f0
[ 14.634164][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.634168][ T71] ? ret_from_fork+0x1b/0x270
[ 14.634174][ T71] ? __lock_release+0x5d/0x170
[ 14.634179][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.634182][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.634185][ T71] ret_from_fork+0x1db/0x270
[ 14.634188][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.634190][ T71] ret_from_fork_asm+0x11/0x20
[ 14.634198][ T71]
[ 14.634200][ T71]
[ 14.640470][ T71] Allocated by task 229:
[ 14.640589][ T71] kasan_save_stack+0x24/0x40
[ 14.640780][ T71] kasan_save_track+0x14/0x30
[ 14.640955][ T71] __kasan_kmalloc+0x7b/0x90
[ 14.641114][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.641287][ T71] alloc_netdev_mqs+0x7d/0x1310
[ 14.641444][ T71] sit_init_net+0x169/0x550
[ 14.641601][ T71] ops_init+0x189/0x550
[ 14.641728][ T71] setup_net+0xf1/0x380
[ 14.641883][ T71] copy_net_ns+0x21a/0x380
[ 14.642035][ T71] create_new_namespaces+0x35f/0x900
[ 14.642205][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 14.642360][ T71] ksys_unshare+0x2a3/0x660
[ 14.642518][ T71] __x64_sys_unshare+0x31/0x40
[ 14.642678][ T71] do_syscall_64+0xc1/0xfd0
[ 14.642856][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.643049][ T71]
[ 14.643129][ T71] Freed by task 71:
[ 14.643255][ T71] kasan_save_stack+0x24/0x40
[ 14.643413][ T71] kasan_save_track+0x14/0x30
[ 14.643568][ T71] __kasan_save_free_info+0x3b/0x60
[ 14.643733][ T71] __kasan_slab_free+0x3f/0x60
[ 14.643906][ T71] kfree+0x21d/0x540
[ 14.644026][ T71] device_release+0x9c/0x210
[ 14.644201][ T71] kobject_cleanup+0xfe/0x360
[ 14.644370][ T71] netdev_run_todo+0x81f/0xc60
[ 14.644526][ T71] ops_undo_list+0x714/0x890
[ 14.644692][ T71] cleanup_net+0x3b2/0x830
[ 14.644847][ T71] process_one_work+0xe35/0x1650
[ 14.645015][ T71] worker_thread+0x591/0xcf0
[ 14.645184][ T71] kthread+0x37b/0x5f0
[ 14.645304][ T71] ret_from_fork+0x1db/0x270
[ 14.645459][ T71] ret_from_fork_asm+0x11/0x20
[ 14.645612][ T71]
[ 14.645707][ T71] The buggy address belongs to the object at ffff888006121000
[ 14.645707][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 14.646091][ T71] The buggy address is located 1684 bytes inside of
[ 14.646091][ T71] freed 4096-byte region [ffff888006121000, ffff888006122000)
[ 14.646476][ T71]
[ 14.646555][ T71] The buggy address belongs to the physical page:
[ 14.646755][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6120
[ 14.647052][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.647305][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.647503][ T71] page_type: f5(slab)
[ 14.647623][ T71] raw: 0080000000000040 ffff888001043700 ffffea000020cc10 ffffea000009b410
[ 14.647910][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.648250][ T71] head: 0080000000000040 ffff888001043700 ffffea000020cc10 ffffea000009b410
[ 14.648533][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.648814][ T71] head: 0080000000000003 ffffea0000184801 00000000ffffffff 00000000ffffffff
[ 14.649101][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.649386][ T71] page dumped because: kasan: bad access detected
[ 14.649575][ T71]
[ 14.649658][ T71] Memory state around the buggy address:
[ 14.649822][ T71] ffff888006121580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.650055][ T71] ffff888006121600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.650290][ T71] >ffff888006121680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.650513][ T71] ^
[ 14.650670][ T71] ffff888006121700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.650896][ T71] ffff888006121780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.651131][ T71] ==================================================================
[ 14.651431][ T71] Disabling lock debugging due to kernel taint
[ 14.651645][ T71] ------------[ cut here ]------------
[ 14.651846][ T71] refcount_t: underflow; use-after-free.
[ 14.652044][ T71] WARNING: CPU: 2 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.652468][ T71] Modules linked in: veth
[ 14.652618][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.653011][ T71] Tainted: [B]=BAD_PAGE
[ 14.653178][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.653403][ T71] Workqueue: netns cleanup_net
[ 14.653585][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.653828][ T71] 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 85 96 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
[ 14.654443][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 14.654660][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.654928][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.655194][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2e3e134
[ 14.655453][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 14.655719][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.655988][ T71] FS: 0000000000000000(0000) GS:ffff888098110000(0000) knlGS:0000000000000000
[ 14.656300][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.656524][ T71] CR2: 00007fbc81d4f9a0 CR3: 0000000009649005 CR4: 0000000000772ef0
[ 14.656796][ T71] PKRU: 55555554
[ 14.656934][ T71] Call Trace:
[ 14.657083][ T71]
[ 14.657191][ T71] netdev_run_todo+0x5f0/0xc60
[ 14.657385][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 14.657583][ T71] ? generic_xdp_install+0x410/0x410
[ 14.657783][ T71] ops_undo_list+0x714/0x890
[ 14.657961][ T71] ? netns_get+0x110/0x110
[ 14.658137][ T71] ? cleanup_net+0x2d6/0x830
[ 14.658349][ T71] cleanup_net+0x3b2/0x830
[ 14.658525][ T71] ? net_passive_dec+0x190/0x190
[ 14.658713][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.658903][ T71] process_one_work+0xe35/0x1650
[ 14.659077][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.659377][ T71] ? assign_work+0x168/0x240
[ 14.659555][ T71] worker_thread+0x591/0xcf0
[ 14.659745][ T71] ? rescuer_thread+0xd10/0xd10
[ 14.659931][ T71] kthread+0x37b/0x5f0
[ 14.660073][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.660305][ T71] ? ret_from_fork+0x1b/0x270
[ 14.660516][ T71] ? __lock_release+0x5d/0x170
[ 14.660804][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.660980][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.661264][ T71] ret_from_fork+0x1db/0x270
[ 14.661460][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.661721][ T71] ret_from_fork_asm+0x11/0x20
[ 14.661957][ T71]
[ 14.662099][ T71] irq event stamp: 2601
[ 14.662261][ T71] hardirqs last enabled at (2601): [] irqentry_exit+0x3b/0x80
[ 14.662603][ T71] hardirqs last disabled at (2600): [] handle_softirqs+0x47f/0x610
[ 14.663003][ T71] softirqs last enabled at (1788): [] handle_softirqs+0x352/0x610
[ 14.663409][ T71] softirqs last disabled at (1781): [] irq_exit_rcu+0xab/0x100
[ 14.663720][ T71] ---[ end trace 0000000000000000 ]---