[ 19.332216][ T273] ip (273) used greatest stack depth: 23744 bytes left
[ 189.195003][ T12] ==================================================================
[ 189.195296][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 189.195572][ T12] Read of size 1 at addr ffff88800a2b16ac by task kworker/u16:0/12
[ 189.195831][ T12]
[ 189.195923][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 189.195928][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 189.195932][ T12] Workqueue: netns cleanup_net
[ 189.195938][ T12] Call Trace:
[ 189.195941][ T12]
[ 189.195943][ T12] dump_stack_lvl+0x82/0xc0
[ 189.195950][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 189.195960][ T12] ? kobject_put+0xbb/0xd0
[ 189.195964][ T12] print_report+0xb4/0x270
[ 189.195968][ T12] ? kobject_put+0xbb/0xd0
[ 189.195971][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 189.195974][ T12] ? kobject_put+0xbb/0xd0
[ 189.195978][ T12] kasan_report+0xca/0x100
[ 189.195982][ T12] ? kobject_put+0xbb/0xd0
[ 189.195988][ T12] kobject_put+0xbb/0xd0
[ 189.195991][ T12] netdev_run_todo+0x5f0/0xc60
[ 189.195998][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 189.196001][ T12] ? generic_xdp_install+0x410/0x410
[ 189.196008][ T12] ops_undo_list+0x714/0x890
[ 189.196016][ T12] ? netns_get+0x110/0x110
[ 189.196019][ T12] ? cleanup_net+0x2d6/0x830
[ 189.196024][ T12] cleanup_net+0x3b2/0x830
[ 189.196028][ T12] ? net_passive_dec+0x190/0x190
[ 189.196031][ T12] ? rcu_is_watching+0x12/0xb0
[ 189.196038][ T12] process_one_work+0xe35/0x1650
[ 189.196047][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 189.196053][ T12] ? assign_work+0x168/0x240
[ 189.196057][ T12] worker_thread+0x591/0xcf0
[ 189.196063][ T12] ? rescuer_thread+0xd10/0xd10
[ 189.196067][ T12] kthread+0x37b/0x5f0
[ 189.196072][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 189.196074][ T12] ? ret_from_fork+0x1b/0x270
[ 189.196082][ T12] ? __lock_release+0x5d/0x170
[ 189.196089][ T12] ? rcu_is_watching+0x12/0xb0
[ 189.196092][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 189.196095][ T12] ret_from_fork+0x1db/0x270
[ 189.196099][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 189.196102][ T12] ret_from_fork_asm+0x11/0x20
[ 189.196112][ T12]
[ 189.196113][ T12]
[ 189.202703][ T12] Allocated by task 264:
[ 189.202835][ T12] kasan_save_stack+0x24/0x40
[ 189.203018][ T12] kasan_save_track+0x14/0x30
[ 189.203193][ T12] __kasan_kmalloc+0x7b/0x90
[ 189.203366][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 189.203547][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 189.203723][ T12] sit_init_net+0x169/0x550
[ 189.203894][ T12] ops_init+0x189/0x550
[ 189.204021][ T12] setup_net+0xf1/0x380
[ 189.204244][ T12] copy_net_ns+0x21a/0x380
[ 189.204415][ T12] create_new_namespaces+0x35f/0x900
[ 189.204591][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 189.204768][ T12] ksys_unshare+0x2a3/0x660
[ 189.205027][ T12] __x64_sys_unshare+0x31/0x40
[ 189.205199][ T12] do_syscall_64+0xc1/0xfd0
[ 189.205371][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 189.205584][ T12]
[ 189.205668][ T12] Freed by task 12:
[ 189.205794][ T12] kasan_save_stack+0x24/0x40
[ 189.205969][ T12] kasan_save_track+0x14/0x30
[ 189.206140][ T12] __kasan_save_free_info+0x3b/0x60
[ 189.206403][ T12] __kasan_slab_free+0x3f/0x60
[ 189.206574][ T12] kfree+0x21d/0x540
[ 189.206704][ T12] device_release+0x9c/0x210
[ 189.206877][ T12] kobject_cleanup+0xfe/0x360
[ 189.207056][ T12] netdev_run_todo+0x81f/0xc60
[ 189.207233][ T12] ops_undo_list+0x714/0x890
[ 189.207406][ T12] cleanup_net+0x3b2/0x830
[ 189.207575][ T12] process_one_work+0xe35/0x1650
[ 189.207744][ T12] worker_thread+0x591/0xcf0
[ 189.207917][ T12] kthread+0x37b/0x5f0
[ 189.208046][ T12] ret_from_fork+0x1db/0x270
[ 189.208216][ T12] ret_from_fork_asm+0x11/0x20
[ 189.208383][ T12]
[ 189.208470][ T12] The buggy address belongs to the object at ffff88800a2b1000
[ 189.208470][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 189.208881][ T12] The buggy address is located 1708 bytes inside of
[ 189.208881][ T12] freed 4096-byte region [ffff88800a2b1000, ffff88800a2b2000)
[ 189.209292][ T12]
[ 189.209378][ T12] The buggy address belongs to the physical page:
[ 189.209583][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa2b0
[ 189.209991][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 189.210250][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 189.210465][ T12] page_type: f5(slab)
[ 189.210695][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000166410 ffffea00002a6210
[ 189.211002][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 189.211404][ T12] head: 0080000000000040 ffff888001043700 ffffea0000166410 ffffea00002a6210
[ 189.211813][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 189.212208][ T12] head: 0080000000000003 ffffea000028ac01 00000000ffffffff 00000000ffffffff
[ 189.212510][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 189.212810][ T12] page dumped because: kasan: bad access detected
[ 189.213114][ T12]
[ 189.213203][ T12] Memory state around the buggy address:
[ 189.213366][ T12] ffff88800a2b1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 189.213619][ T12] ffff88800a2b1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 189.214040][ T12] >ffff88800a2b1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 189.214379][ T12] ^
[ 189.214546][ T12] ffff88800a2b1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 189.214874][ T12] ffff88800a2b1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 189.215117][ T12] ==================================================================
[ 189.215422][ T12] Disabling lock debugging due to kernel taint
[ 189.215662][ T12] ------------[ cut here ]------------
[ 189.215910][ T12] refcount_t: underflow; use-after-free.
[ 189.216113][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 189.216457][ T12] Modules linked in: tcp_diag inet_diag nft_masq nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 189.216885][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 189.217271][ T12] Tainted: [B]=BAD_PAGE
[ 189.217401][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 189.217611][ T12] Workqueue: netns cleanup_net
[ 189.217796][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 189.218014][ T12] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de 25 9b e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 189.218626][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 189.218839][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 189.219102][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 189.219361][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff377e220
[ 189.219944][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 189.220203][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 189.220464][ T12] FS: 0000000000000000(0000) GS:ffff8880991ec000(0000) knlGS:0000000000000000
[ 189.220751][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 189.221054][ T12] CR2: 00007ffd6f7eabf8 CR3: 00000000023b5006 CR4: 0000000000772ef0
[ 189.221318][ T12] PKRU: 55555554
[ 189.221444][ T12] Call Trace:
[ 189.221570][ T12]
[ 189.221664][ T12] netdev_run_todo+0x5f0/0xc60
[ 189.221939][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 189.222107][ T12] ? generic_xdp_install+0x410/0x410
[ 189.222287][ T12] ops_undo_list+0x714/0x890
[ 189.222465][ T12] ? netns_get+0x110/0x110
[ 189.222723][ T12] ? cleanup_net+0x2d6/0x830
[ 189.222891][ T12] cleanup_net+0x3b2/0x830
[ 189.223060][ T12] ? net_passive_dec+0x190/0x190
[ 189.223244][ T12] ? rcu_is_watching+0x12/0xb0
[ 189.223507][ T12] process_one_work+0xe35/0x1650
[ 189.223675][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 189.223843][ T12] ? assign_work+0x168/0x240
[ 189.224007][ T12] worker_thread+0x591/0xcf0
[ 189.224183][ T12] ? rescuer_thread+0xd10/0xd10
[ 189.224346][ T12] kthread+0x37b/0x5f0
[ 189.224471][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 189.224644][ T12] ? ret_from_fork+0x1b/0x270
[ 189.224902][ T12] ? __lock_release+0x5d/0x170
[ 189.225073][ T12] ? rcu_is_watching+0x12/0xb0
[ 189.225247][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 189.225416][ T12] ret_from_fork+0x1db/0x270
[ 189.225667][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 189.225833][ T12] ret_from_fork_asm+0x11/0x20
[ 189.226004][ T12]
[ 189.226145][ T12] irq event stamp: 94903
[ 189.226274][ T12] hardirqs last enabled at (94903): [] finish_task_switch.isra.0+0x245/0x960
[ 189.226613][ T12] hardirqs last disabled at (94902): [] __schedule+0x94a/0x1b10
[ 189.226913][ T12] softirqs last enabled at (94210): [] handle_softirqs+0x352/0x610
[ 189.227302][ T12] softirqs last disabled at (94205): [] irq_exit_rcu+0xab/0x100
[ 189.227603][ T12] ---[ end trace 0000000000000000 ]---