[ 16.199460][ T258] ip (258) used greatest stack depth: 24688 bytes left
[ 46.467109][ T757] pm_nl_ctl (757) used greatest stack depth: 23616 bytes left
[ 82.091972][ T12] ==================================================================
[ 82.092254][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 82.092498][ T12] Read of size 1 at addr ffff8880080c969c by task kworker/u16:0/12
[ 82.092719][ T12]
[ 82.092798][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 82.092804][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 82.092808][ T12] Workqueue: netns cleanup_net
[ 82.092817][ T12] Call Trace:
[ 82.092819][ T12]
[ 82.092822][ T12] dump_stack_lvl+0x82/0xc0
[ 82.092828][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 82.092837][ T12] ? kobject_put+0xbb/0xd0
[ 82.092840][ T12] print_report+0xb4/0x270
[ 82.092844][ T12] ? kobject_put+0xbb/0xd0
[ 82.092847][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 82.092851][ T12] ? kobject_put+0xbb/0xd0
[ 82.092854][ T12] kasan_report+0xca/0x100
[ 82.092857][ T12] ? kobject_put+0xbb/0xd0
[ 82.092863][ T12] kobject_put+0xbb/0xd0
[ 82.092866][ T12] netdev_run_todo+0x5f0/0xc60
[ 82.092871][ T12] ? irqentry_exit+0x3b/0x80
[ 82.092876][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 82.092879][ T12] ? generic_xdp_install+0x410/0x410
[ 82.092886][ T12] ops_undo_list+0x714/0x890
[ 82.092891][ T12] ? netns_get+0x110/0x110
[ 82.092893][ T12] ? cleanup_net+0x2d6/0x830
[ 82.092899][ T12] cleanup_net+0x3b2/0x830
[ 82.092903][ T12] ? net_passive_dec+0x190/0x190
[ 82.092908][ T12] ? rcu_is_watching+0x12/0xb0
[ 82.092916][ T12] process_one_work+0xe35/0x1650
[ 82.092927][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 82.092933][ T12] ? assign_work+0x168/0x240
[ 82.092937][ T12] worker_thread+0x591/0xcf0
[ 82.092943][ T12] ? rescuer_thread+0xd10/0xd10
[ 82.092947][ T12] kthread+0x37b/0x5f0
[ 82.092952][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 82.092955][ T12] ? ret_from_fork+0x1b/0x270
[ 82.092960][ T12] ? __lock_release+0x5d/0x170
[ 82.092966][ T12] ? rcu_is_watching+0x12/0xb0
[ 82.092970][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 82.092974][ T12] ret_from_fork+0x1db/0x270
[ 82.092976][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 82.092980][ T12] ret_from_fork_asm+0x11/0x20
[ 82.092990][ T12]
[ 82.092992][ T12]
[ 82.099018][ T12] Allocated by task 239:
[ 82.099137][ T12] kasan_save_stack+0x24/0x40
[ 82.099298][ T12] kasan_save_track+0x14/0x30
[ 82.099453][ T12] __kasan_kmalloc+0x7b/0x90
[ 82.099607][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 82.099766][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 82.099923][ T12] sit_init_net+0x169/0x550
[ 82.100081][ T12] ops_init+0x189/0x550
[ 82.100198][ T12] setup_net+0xf1/0x380
[ 82.100321][ T12] copy_net_ns+0x21a/0x380
[ 82.100477][ T12] create_new_namespaces+0x35f/0x900
[ 82.100631][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 82.100793][ T12] ksys_unshare+0x2a3/0x660
[ 82.100958][ T12] __x64_sys_unshare+0x31/0x40
[ 82.101116][ T12] do_syscall_64+0xc1/0xfd0
[ 82.101273][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 82.101561][ T12]
[ 82.101640][ T12] Freed by task 12:
[ 82.101762][ T12] kasan_save_stack+0x24/0x40
[ 82.101919][ T12] kasan_save_track+0x14/0x30
[ 82.102076][ T12] __kasan_save_free_info+0x3b/0x60
[ 82.102232][ T12] __kasan_slab_free+0x3f/0x60
[ 82.102387][ T12] kfree+0x21d/0x540
[ 82.102509][ T12] device_release+0x9c/0x210
[ 82.102667][ T12] kobject_cleanup+0xfe/0x360
[ 82.102911][ T12] netdev_run_todo+0x81f/0xc60
[ 82.103069][ T12] ops_undo_list+0x714/0x890
[ 82.103222][ T12] cleanup_net+0x3b2/0x830
[ 82.103382][ T12] process_one_work+0xe35/0x1650
[ 82.103622][ T12] worker_thread+0x591/0xcf0
[ 82.103779][ T12] kthread+0x37b/0x5f0
[ 82.103898][ T12] ret_from_fork+0x1db/0x270
[ 82.104051][ T12] ret_from_fork_asm+0x11/0x20
[ 82.104299][ T12]
[ 82.104381][ T12] The buggy address belongs to the object at ffff8880080c9000
[ 82.104381][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 82.104752][ T12] The buggy address is located 1692 bytes inside of
[ 82.104752][ T12] freed 4096-byte region [ffff8880080c9000, ffff8880080ca000)
[ 82.105122][ T12]
[ 82.105206][ T12] The buggy address belongs to the physical page:
[ 82.105405][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x80c8
[ 82.105771][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 82.106005][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 82.106291][ T12] page_type: f5(slab)
[ 82.106417][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002a7e10 ffffea00001dae10
[ 82.106699][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 82.107068][ T12] head: 0080000000000040 ffff888001043700 ffffea00002a7e10 ffffea00001dae10
[ 82.107352][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 82.107625][ T12] head: 0080000000000003 ffffea0000203201 00000000ffffffff 00000000ffffffff
[ 82.107989][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 82.108264][ T12] page dumped because: kasan: bad access detected
[ 82.108544][ T12]
[ 82.108624][ T12] Memory state around the buggy address:
[ 82.108775][ T12] ffff8880080c9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 82.109006][ T12] ffff8880080c9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 82.109230][ T12] >ffff8880080c9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 82.109454][ T12] ^
[ 82.109600][ T12] ffff8880080c9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 82.109908][ T12] ffff8880080c9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 82.110131][ T12] ==================================================================
[ 82.110462][ T12] Disabling lock debugging due to kernel taint
[ 82.110646][ T12] ------------[ cut here ]------------
[ 82.110786][ T12] refcount_t: underflow; use-after-free.
[ 82.110971][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 82.111260][ T12] Modules linked in:
[ 82.111385][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 82.111725][ T12] Tainted: [B]=BAD_PAGE
[ 82.111842][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 82.112033][ T12] Workqueue: netns cleanup_net
[ 82.112198][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 82.112392][ T12] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d a5 a1 e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 82.112927][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 82.113130][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 82.113356][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 82.113582][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4482934
[ 82.113807][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 82.114034][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 82.114268][ T12] FS: 0000000000000000(0000) GS:ffff888092984000(0000) knlGS:0000000000000000
[ 82.114534][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 82.114722][ T12] CR2: 00007f3615352178 CR3: 000000002f759001 CR4: 0000000000772ef0
[ 82.114946][ T12] PKRU: 55555554
[ 82.115059][ T12] Call Trace:
[ 82.115181][ T12]
[ 82.115269][ T12] netdev_run_todo+0x5f0/0xc60
[ 82.115422][ T12] ? irqentry_exit+0x3b/0x80
[ 82.115576][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 82.115726][ T12] ? generic_xdp_install+0x410/0x410
[ 82.115880][ T12] ops_undo_list+0x714/0x890
[ 82.116032][ T12] ? netns_get+0x110/0x110
[ 82.116188][ T12] ? cleanup_net+0x2d6/0x830
[ 82.116347][ T12] cleanup_net+0x3b2/0x830
[ 82.116499][ T12] ? net_passive_dec+0x190/0x190
[ 82.116651][ T12] ? rcu_is_watching+0x12/0xb0
[ 82.116808][ T12] process_one_work+0xe35/0x1650
[ 82.116964][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 82.117208][ T12] ? assign_work+0x168/0x240
[ 82.117360][ T12] worker_thread+0x591/0xcf0
[ 82.117596][ T12] ? rescuer_thread+0xd10/0xd10
[ 82.117750][ T12] kthread+0x37b/0x5f0
[ 82.117864][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 82.118014][ T12] ? ret_from_fork+0x1b/0x270
[ 82.118255][ T12] ? __lock_release+0x5d/0x170
[ 82.118412][ T12] ? rcu_is_watching+0x12/0xb0
[ 82.118562][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 82.118797][ T12] ret_from_fork+0x1db/0x270
[ 82.119030][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 82.119193][ T12] ret_from_fork_asm+0x11/0x20
[ 82.119351][ T12]
[ 82.119464][ T12] irq event stamp: 5135
[ 82.119578][ T12] hardirqs last enabled at (5135): [] irqentry_exit+0x3b/0x80
[ 82.119836][ T12] hardirqs last disabled at (5134): [] handle_softirqs+0x47f/0x610
[ 82.120103][ T12] softirqs last enabled at (4456): [] handle_softirqs+0x352/0x610
[ 82.120451][ T12] softirqs last disabled at (4449): [] irq_exit_rcu+0xab/0x100
[ 82.120710][ T12] ---[ end trace 0000000000000000 ]---