[ 22.599023][ T267] ip (267) used greatest stack depth: 23920 bytes left
[ 253.109433][ T12] ==================================================================
[ 253.109801][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 253.110095][ T12] Read of size 1 at addr ffff8880072046ac by task kworker/u16:0/12
[ 253.110404][ T12]
[ 253.110513][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 253.110520][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 253.110524][ T12] Workqueue: netns cleanup_net
[ 253.110534][ T12] Call Trace:
[ 253.110536][ T12]
[ 253.110540][ T12] dump_stack_lvl+0x82/0xc0
[ 253.110546][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 253.110557][ T12] ? kobject_put+0xbb/0xd0
[ 253.110561][ T12] print_report+0xb4/0x270
[ 253.110564][ T12] ? kobject_put+0xbb/0xd0
[ 253.110567][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 253.110572][ T12] ? kobject_put+0xbb/0xd0
[ 253.110575][ T12] kasan_report+0xca/0x100
[ 253.110579][ T12] ? kobject_put+0xbb/0xd0
[ 253.110585][ T12] kobject_put+0xbb/0xd0
[ 253.110588][ T12] netdev_run_todo+0x5f0/0xc60
[ 253.110595][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 253.110599][ T12] ? generic_xdp_install+0x410/0x410
[ 253.110606][ T12] ops_undo_list+0x714/0x890
[ 253.110615][ T12] ? netns_get+0x110/0x110
[ 253.110618][ T12] ? cleanup_net+0x2d6/0x830
[ 253.110623][ T12] cleanup_net+0x3b2/0x830
[ 253.110626][ T12] ? net_passive_dec+0x190/0x190
[ 253.110630][ T12] ? rcu_is_watching+0x12/0xb0
[ 253.110638][ T12] process_one_work+0xe35/0x1650
[ 253.110648][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 253.110654][ T12] ? assign_work+0x168/0x240
[ 253.110658][ T12] worker_thread+0x591/0xcf0
[ 253.110664][ T12] ? rescuer_thread+0xd10/0xd10
[ 253.110667][ T12] kthread+0x37b/0x5f0
[ 253.110672][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 253.110675][ T12] ? ret_from_fork+0x1b/0x270
[ 253.110685][ T12] ? __lock_release+0x5d/0x170
[ 253.110691][ T12] ? rcu_is_watching+0x12/0xb0
[ 253.110694][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 253.110697][ T12] ret_from_fork+0x1db/0x270
[ 253.110700][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 253.110703][ T12] ret_from_fork_asm+0x11/0x20
[ 253.110715][ T12]
[ 253.110717][ T12]
[ 253.117343][ T12] Allocated by task 266:
[ 253.117477][ T12] kasan_save_stack+0x24/0x40
[ 253.117655][ T12] kasan_save_track+0x14/0x30
[ 253.117819][ T12] __kasan_kmalloc+0x7b/0x90
[ 253.117992][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 253.118184][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 253.118353][ T12] sit_init_net+0x169/0x550
[ 253.118525][ T12] ops_init+0x189/0x550
[ 253.118655][ T12] setup_net+0xf1/0x380
[ 253.118774][ T12] copy_net_ns+0x21a/0x380
[ 253.118931][ T12] create_new_namespaces+0x35f/0x900
[ 253.119110][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 253.119277][ T12] ksys_unshare+0x2a3/0x660
[ 253.119460][ T12] __x64_sys_unshare+0x31/0x40
[ 253.119621][ T12] do_syscall_64+0xc1/0xfd0
[ 253.119784][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 253.120003][ T12]
[ 253.120141][ T12] Freed by task 12:
[ 253.120283][ T12] kasan_save_stack+0x24/0x40
[ 253.120467][ T12] kasan_save_track+0x14/0x30
[ 253.120640][ T12] __kasan_save_free_info+0x3b/0x60
[ 253.120798][ T12] __kasan_slab_free+0x3f/0x60
[ 253.120961][ T12] kfree+0x21d/0x540
[ 253.121098][ T12] device_release+0x9c/0x210
[ 253.121263][ T12] kobject_cleanup+0xfe/0x360
[ 253.121437][ T12] netdev_run_todo+0x81f/0xc60
[ 253.121601][ T12] ops_undo_list+0x714/0x890
[ 253.121769][ T12] cleanup_net+0x3b2/0x830
[ 253.121938][ T12] process_one_work+0xe35/0x1650
[ 253.122122][ T12] worker_thread+0x591/0xcf0
[ 253.122304][ T12] kthread+0x37b/0x5f0
[ 253.122436][ T12] ret_from_fork+0x1db/0x270
[ 253.122599][ T12] ret_from_fork_asm+0x11/0x20
[ 253.122764][ T12]
[ 253.122852][ T12] The buggy address belongs to the object at ffff888007204000
[ 253.122852][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 253.123295][ T12] The buggy address is located 1708 bytes inside of
[ 253.123295][ T12] freed 4096-byte region [ffff888007204000, ffff888007205000)
[ 253.123710][ T12]
[ 253.123813][ T12] The buggy address belongs to the physical page:
[ 253.124080][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7200
[ 253.124399][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 253.124660][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 253.124895][ T12] page_type: f5(slab)
[ 253.125040][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000207c10 ffffea000012dc10
[ 253.125385][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 253.125690][ T12] head: 0080000000000040 ffff888001043700 ffffea0000207c10 ffffea000012dc10
[ 253.126018][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 253.126354][ T12] head: 0080000000000003 ffffea00001c8001 00000000ffffffff 00000000ffffffff
[ 253.126658][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 253.126989][ T12] page dumped because: kasan: bad access detected
[ 253.127233][ T12]
[ 253.127331][ T12] Memory state around the buggy address:
[ 253.127499][ T12] ffff888007204580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 253.127803][ T12] ffff888007204600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 253.128134][ T12] >ffff888007204680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 253.128498][ T12] ^
[ 253.128743][ T12] ffff888007204700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 253.129110][ T12] ffff888007204780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 253.129477][ T12] ==================================================================
[ 253.130147][ T12] Disabling lock debugging due to kernel taint
[ 253.130439][ T12] ------------[ cut here ]------------
[ 253.130685][ T12] refcount_t: underflow; use-after-free.
[ 253.130905][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 253.131296][ 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
[ 253.131780][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 253.132205][ T12] Tainted: [B]=BAD_PAGE
[ 253.132336][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 253.132580][ T12] Workqueue: netns cleanup_net
[ 253.132814][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 253.133083][ 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 a5 98 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
[ 253.133788][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 253.134027][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 253.134318][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 253.134732][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff327e220
[ 253.135002][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 253.135287][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 253.135712][ T12] FS: 0000000000000000(0000) GS:ffff88809b9ec000(0000) knlGS:0000000000000000
[ 253.136031][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 253.136268][ T12] CR2: 000055901cdacd08 CR3: 0000000012f35003 CR4: 0000000000772ef0
[ 253.136552][ T12] PKRU: 55555554
[ 253.136701][ T12] Call Trace:
[ 253.136832][ T12]
[ 253.136930][ T12] netdev_run_todo+0x5f0/0xc60
[ 253.137143][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 253.137333][ T12] ? generic_xdp_install+0x410/0x410
[ 253.137532][ T12] ops_undo_list+0x714/0x890
[ 253.137731][ T12] ? netns_get+0x110/0x110
[ 253.137907][ T12] ? cleanup_net+0x2d6/0x830
[ 253.138116][ T12] cleanup_net+0x3b2/0x830
[ 253.138297][ T12] ? net_passive_dec+0x190/0x190
[ 253.138499][ T12] ? rcu_is_watching+0x12/0xb0
[ 253.138687][ T12] process_one_work+0xe35/0x1650
[ 253.138884][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 253.139086][ T12] ? assign_work+0x168/0x240
[ 253.139288][ T12] worker_thread+0x591/0xcf0
[ 253.139506][ T12] ? rescuer_thread+0xd10/0xd10
[ 253.139694][ T12] kthread+0x37b/0x5f0
[ 253.139826][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 253.140043][ T12] ? ret_from_fork+0x1b/0x270
[ 253.140245][ T12] ? __lock_release+0x5d/0x170
[ 253.140439][ T12] ? rcu_is_watching+0x12/0xb0
[ 253.140658][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 253.140832][ T12] ret_from_fork+0x1db/0x270
[ 253.141017][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 253.141223][ T12] ret_from_fork_asm+0x11/0x20
[ 253.141409][ T12]
[ 253.141581][ T12] irq event stamp: 83369
[ 253.141732][ T12] hardirqs last enabled at (83369): [] finish_task_switch.isra.0+0x245/0x960
[ 253.142117][ T12] hardirqs last disabled at (83368): [] __schedule+0x94a/0x1b10
[ 253.142508][ T12] softirqs last enabled at (82504): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 253.142877][ T12] softirqs last disabled at (82502): [] dev_mc_flush+0x54/0x90
[ 253.143310][ T12] ---[ end trace 0000000000000000 ]---