[ 17.992441][ T251] ip (251) used greatest stack depth: 23680 bytes left
[ 24.708045][ T12] ==================================================================
[ 24.708380][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 24.708667][ T12] Read of size 1 at addr ffff8880086f46ac by task kworker/u16:0/12
[ 24.708933][ T12]
[ 24.709020][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 24.709025][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 24.709027][ T12] Workqueue: netns cleanup_net
[ 24.709033][ T12] Call Trace:
[ 24.709035][ T12]
[ 24.709039][ T12] dump_stack_lvl+0x82/0xc0
[ 24.709044][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 24.709051][ T12] ? kobject_put+0xbb/0xd0
[ 24.709055][ T12] print_report+0xb4/0x270
[ 24.709059][ T12] ? kobject_put+0xbb/0xd0
[ 24.709062][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 24.709065][ T12] ? kobject_put+0xbb/0xd0
[ 24.709068][ T12] kasan_report+0xca/0x100
[ 24.709073][ T12] ? kobject_put+0xbb/0xd0
[ 24.709079][ T12] kobject_put+0xbb/0xd0
[ 24.709082][ T12] netdev_run_todo+0x5f0/0xc60
[ 24.709087][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 24.709091][ T12] ? generic_xdp_install+0x410/0x410
[ 24.709098][ T12] ops_undo_list+0x714/0x890
[ 24.709105][ T12] ? netns_get+0x110/0x110
[ 24.709108][ T12] ? cleanup_net+0x2d6/0x830
[ 24.709113][ T12] cleanup_net+0x3b2/0x830
[ 24.709117][ T12] ? net_passive_dec+0x190/0x190
[ 24.709120][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.709126][ T12] process_one_work+0xe35/0x1650
[ 24.709134][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 24.709140][ T12] ? assign_work+0x168/0x240
[ 24.709143][ T12] worker_thread+0x591/0xcf0
[ 24.709149][ T12] ? rescuer_thread+0xd10/0xd10
[ 24.709152][ T12] kthread+0x37b/0x5f0
[ 24.709156][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.709159][ T12] ? ret_from_fork+0x1b/0x270
[ 24.709164][ T12] ? __lock_release+0x5d/0x170
[ 24.709169][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.709172][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.709176][ T12] ret_from_fork+0x1db/0x270
[ 24.709179][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.709182][ T12] ret_from_fork_asm+0x11/0x20
[ 24.709191][ T12]
[ 24.709192][ T12]
[ 24.715572][ T12] Allocated by task 250:
[ 24.715703][ T12] kasan_save_stack+0x24/0x40
[ 24.715871][ T12] kasan_save_track+0x14/0x30
[ 24.716037][ T12] __kasan_kmalloc+0x7b/0x90
[ 24.716201][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 24.716373][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 24.716543][ T12] sit_init_net+0x169/0x550
[ 24.716710][ T12] ops_init+0x189/0x550
[ 24.716833][ T12] setup_net+0xf1/0x380
[ 24.716959][ T12] copy_net_ns+0x21a/0x380
[ 24.717121][ T12] create_new_namespaces+0x35f/0x900
[ 24.717315][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 24.717522][ T12] ksys_unshare+0x2a3/0x660
[ 24.717692][ T12] __x64_sys_unshare+0x31/0x40
[ 24.717861][ T12] do_syscall_64+0xc1/0xfd0
[ 24.718027][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 24.718225][ T12]
[ 24.718318][ T12] Freed by task 12:
[ 24.718438][ T12] kasan_save_stack+0x24/0x40
[ 24.718602][ T12] kasan_save_track+0x14/0x30
[ 24.718766][ T12] __kasan_save_free_info+0x3b/0x60
[ 24.718930][ T12] __kasan_slab_free+0x3f/0x60
[ 24.719094][ T12] kfree+0x21d/0x540
[ 24.719215][ T12] device_release+0x9c/0x210
[ 24.719384][ T12] kobject_cleanup+0xfe/0x360
[ 24.719546][ T12] netdev_run_todo+0x81f/0xc60
[ 24.719711][ T12] ops_undo_list+0x714/0x890
[ 24.719871][ T12] cleanup_net+0x3b2/0x830
[ 24.720034][ T12] process_one_work+0xe35/0x1650
[ 24.720193][ T12] worker_thread+0x591/0xcf0
[ 24.720369][ T12] kthread+0x37b/0x5f0
[ 24.720490][ T12] ret_from_fork+0x1db/0x270
[ 24.720657][ T12] ret_from_fork_asm+0x11/0x20
[ 24.720823][ T12]
[ 24.720909][ T12] The buggy address belongs to the object at ffff8880086f4000
[ 24.720909][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 24.721300][ T12] The buggy address is located 1708 bytes inside of
[ 24.721300][ T12] freed 4096-byte region [ffff8880086f4000, ffff8880086f5000)
[ 24.721692][ T12]
[ 24.721778][ T12] The buggy address belongs to the physical page:
[ 24.721977][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x86f0
[ 24.722266][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 24.722517][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 24.722727][ T12] page_type: f5(slab)
[ 24.722859][ T12] raw: 0080000000000040 ffff888001043700 ffffea000020be10 ffffea00001f7210
[ 24.723152][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 24.723443][ T12] head: 0080000000000040 ffff888001043700 ffffea000020be10 ffffea00001f7210
[ 24.723731][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 24.724023][ T12] head: 0080000000000003 ffffea000021bc01 00000000ffffffff 00000000ffffffff
[ 24.724309][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 24.724589][ T12] page dumped because: kasan: bad access detected
[ 24.724785][ T12]
[ 24.724871][ T12] Memory state around the buggy address:
[ 24.725038][ T12] ffff8880086f4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.725284][ T12] ffff8880086f4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.725514][ T12] >ffff8880086f4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.725744][ T12] ^
[ 24.725909][ T12] ffff8880086f4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.726139][ T12] ffff8880086f4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.726372][ T12] ==================================================================
[ 24.726791][ T12] Disabling lock debugging due to kernel taint
[ 24.727075][ T12] ------------[ cut here ]------------
[ 24.727244][ T12] refcount_t: underflow; use-after-free.
[ 24.727442][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 24.727738][ T12] Modules linked in: nf_conntrack_netlink nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables
[ 24.728505][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 24.728896][ T12] Tainted: [B]=BAD_PAGE
[ 24.729028][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 24.729235][ T12] Workqueue: netns cleanup_net
[ 24.729409][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 24.729621][ 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 85 92 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
[ 24.730217][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 24.730429][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 24.730679][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 24.730930][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff263e220
[ 24.731229][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 24.731493][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 24.731739][ T12] FS: 0000000000000000(0000) GS:ffff8880a1d6c000(0000) knlGS:0000000000000000
[ 24.732014][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 24.732214][ T12] CR2: 00007f7bbf12f000 CR3: 0000000016f35001 CR4: 0000000000772ef0
[ 24.732449][ T12] PKRU: 55555554
[ 24.732571][ T12] Call Trace:
[ 24.732688][ T12]
[ 24.732768][ T12] netdev_run_todo+0x5f0/0xc60
[ 24.732936][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 24.733094][ T12] ? generic_xdp_install+0x410/0x410
[ 24.733255][ T12] ops_undo_list+0x714/0x890
[ 24.733412][ T12] ? netns_get+0x110/0x110
[ 24.733569][ T12] ? cleanup_net+0x2d6/0x830
[ 24.733722][ T12] cleanup_net+0x3b2/0x830
[ 24.733875][ T12] ? net_passive_dec+0x190/0x190
[ 24.734034][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.734190][ T12] process_one_work+0xe35/0x1650
[ 24.734379][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 24.734539][ T12] ? assign_work+0x168/0x240
[ 24.734690][ T12] worker_thread+0x591/0xcf0
[ 24.734841][ T12] ? rescuer_thread+0xd10/0xd10
[ 24.735006][ T12] kthread+0x37b/0x5f0
[ 24.735123][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.735275][ T12] ? ret_from_fork+0x1b/0x270
[ 24.735434][ T12] ? __lock_release+0x5d/0x170
[ 24.735596][ T12] ? rcu_is_watching+0x12/0xb0
[ 24.735759][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.735922][ T12] ret_from_fork+0x1db/0x270
[ 24.736079][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.736240][ T12] ret_from_fork_asm+0x11/0x20
[ 24.736402][ T12]
[ 24.736520][ T12] irq event stamp: 3517
[ 24.736638][ T12] hardirqs last enabled at (3517): [] finish_task_switch.isra.0+0x245/0x960
[ 24.736950][ T12] hardirqs last disabled at (3516): [] __schedule+0x94a/0x1b10
[ 24.737226][ T12] softirqs last enabled at (3346): [] handle_softirqs+0x352/0x610
[ 24.737508][ T12] softirqs last disabled at (3339): [] irq_exit_rcu+0xab/0x100
[ 24.737767][ T12] ---[ end trace 0000000000000000 ]---