[ 21.615984][ T256] ip (256) used greatest stack depth: 24176 bytes left
[ 205.109513][ T12] ==================================================================
[ 205.110020][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 205.110468][ T12] Read of size 1 at addr ffff8880079a16ac by task kworker/u16:0/12
[ 205.110889][ T12]
[ 205.111054][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 205.111061][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 205.111065][ T12] Workqueue: netns cleanup_net
[ 205.111079][ T12] Call Trace:
[ 205.111082][ T12]
[ 205.111086][ T12] dump_stack_lvl+0x82/0xc0
[ 205.111094][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 205.111115][ T12] ? kobject_put+0xbb/0xd0
[ 205.111121][ T12] print_report+0xb4/0x270
[ 205.111126][ T12] ? kobject_put+0xbb/0xd0
[ 205.111131][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 205.111137][ T12] ? kobject_put+0xbb/0xd0
[ 205.111141][ T12] kasan_report+0xca/0x100
[ 205.111149][ T12] ? kobject_put+0xbb/0xd0
[ 205.111159][ T12] kobject_put+0xbb/0xd0
[ 205.111165][ T12] netdev_run_todo+0x5f0/0xc60
[ 205.111171][ T12] ? irqentry_exit+0x3b/0x80
[ 205.111178][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 205.111184][ T12] ? generic_xdp_install+0x410/0x410
[ 205.111200][ T12] ops_undo_list+0x714/0x890
[ 205.111211][ T12] ? netns_get+0x110/0x110
[ 205.111216][ T12] ? cleanup_net+0x2d6/0x830
[ 205.111225][ T12] cleanup_net+0x3b2/0x830
[ 205.111230][ T12] ? net_passive_dec+0x190/0x190
[ 205.111236][ T12] ? rcu_is_watching+0x12/0xb0
[ 205.111249][ T12] process_one_work+0xe35/0x1650
[ 205.111267][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 205.111276][ T12] ? assign_work+0x168/0x240
[ 205.111282][ T12] worker_thread+0x591/0xcf0
[ 205.111292][ T12] ? rescuer_thread+0xd10/0xd10
[ 205.111299][ T12] kthread+0x37b/0x5f0
[ 205.111305][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 205.111310][ T12] ? ret_from_fork+0x1b/0x270
[ 205.111328][ T12] ? __lock_release+0x5d/0x170
[ 205.111336][ T12] ? rcu_is_watching+0x12/0xb0
[ 205.111341][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 205.111348][ T12] ret_from_fork+0x1db/0x270
[ 205.111353][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 205.111357][ T12] ret_from_fork_asm+0x11/0x20
[ 205.111376][ T12]
[ 205.111379][ T12]
[ 205.122150][ T12] Allocated by task 255:
[ 205.122375][ T12] kasan_save_stack+0x24/0x40
[ 205.122654][ T12] kasan_save_track+0x14/0x30
[ 205.122932][ T12] __kasan_kmalloc+0x7b/0x90
[ 205.123350][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 205.123652][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 205.123928][ T12] sit_init_net+0x169/0x550
[ 205.124197][ T12] ops_init+0x189/0x550
[ 205.124407][ T12] setup_net+0xf1/0x380
[ 205.124793][ T12] copy_net_ns+0x21a/0x380
[ 205.125066][ T12] create_new_namespaces+0x35f/0x900
[ 205.125338][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 205.125624][ T12] ksys_unshare+0x2a3/0x660
[ 205.126069][ T12] __x64_sys_unshare+0x31/0x40
[ 205.126342][ T12] do_syscall_64+0xc1/0xfd0
[ 205.126613][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 205.126953][ T12]
[ 205.127269][ T12] Freed by task 12:
[ 205.127465][ T12] kasan_save_stack+0x24/0x40
[ 205.127750][ T12] kasan_save_track+0x14/0x30
[ 205.128018][ T12] __kasan_save_free_info+0x3b/0x60
[ 205.128292][ T12] __kasan_slab_free+0x3f/0x60
[ 205.128577][ T12] kfree+0x21d/0x540
[ 205.128784][ T12] device_release+0x9c/0x210
[ 205.129066][ T12] kobject_cleanup+0xfe/0x360
[ 205.129359][ T12] netdev_run_todo+0x81f/0xc60
[ 205.129823][ T12] ops_undo_list+0x714/0x890
[ 205.130090][ T12] cleanup_net+0x3b2/0x830
[ 205.130354][ T12] process_one_work+0xe35/0x1650
[ 205.130640][ T12] worker_thread+0x591/0xcf0
[ 205.131098][ T12] kthread+0x37b/0x5f0
[ 205.131301][ T12] ret_from_fork+0x1db/0x270
[ 205.131579][ T12] ret_from_fork_asm+0x11/0x20
[ 205.131867][ T12]
[ 205.132174][ T12] The buggy address belongs to the object at ffff8880079a1000
[ 205.132174][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 205.132824][ T12] The buggy address is located 1708 bytes inside of
[ 205.132824][ T12] freed 4096-byte region [ffff8880079a1000, ffff8880079a2000)
[ 205.133613][ T12]
[ 205.133753][ T12] The buggy address belongs to the physical page:
[ 205.134094][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79a0
[ 205.134723][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 205.135126][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 205.135495][ T12] page_type: f5(slab)
[ 205.135814][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000231c10 ffffea00001d6210
[ 205.136320][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 205.136792][ T12] head: 0080000000000040 ffff888001043700 ffffea0000231c10 ffffea00001d6210
[ 205.137473][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 205.137953][ T12] head: 0080000000000003 ffffea00001e6801 00000000ffffffff 00000000ffffffff
[ 205.138610][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 205.139082][ T12] page dumped because: kasan: bad access detected
[ 205.139417][ T12]
[ 205.139698][ T12] Memory state around the buggy address:
[ 205.139961][ T12] ffff8880079a1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 205.140354][ T12] ffff8880079a1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 205.140897][ T12] >ffff8880079a1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 205.141287][ T12] ^
[ 205.141553][ T12] ffff8880079a1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 205.142088][ T12] ffff8880079a1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 205.142494][ T12] ==================================================================
[ 205.143298][ T12] Disabling lock debugging due to kernel taint
[ 205.143730][ T12] ------------[ cut here ]------------
[ 205.143990][ T12] refcount_t: underflow; use-after-free.
[ 205.144316][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 205.144810][ T12] Modules linked in: nft_ct nf_conntrack_netlink nft_redir nft_masq tcp_diag inet_diag nft_nat nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 205.145731][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 205.146349][ T12] Tainted: [B]=BAD_PAGE
[ 205.146549][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 205.146881][ T12] Workqueue: netns cleanup_net
[ 205.147172][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 205.147544][ 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 05 a6 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
[ 205.148358][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 205.148604][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 205.148876][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 205.149135][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4d3e220
[ 205.149414][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 205.149697][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 205.149975][ T12] FS: 0000000000000000(0000) GS:ffff88808e56c000(0000) knlGS:0000000000000000
[ 205.150301][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 205.150590][ T12] CR2: 000055ac6f32933c CR3: 000000001d935005 CR4: 0000000000772ef0
[ 205.150972][ T12] PKRU: 55555554
[ 205.151117][ T12] Call Trace:
[ 205.151259][ T12]
[ 205.151351][ T12] netdev_run_todo+0x5f0/0xc60
[ 205.151555][ T12] ? irqentry_exit+0x3b/0x80
[ 205.151740][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 205.151926][ T12] ? generic_xdp_install+0x410/0x410
[ 205.152109][ T12] ops_undo_list+0x714/0x890
[ 205.152294][ T12] ? netns_get+0x110/0x110
[ 205.152487][ T12] ? cleanup_net+0x2d6/0x830
[ 205.152656][ T12] cleanup_net+0x3b2/0x830
[ 205.152833][ T12] ? net_passive_dec+0x190/0x190
[ 205.153006][ T12] ? rcu_is_watching+0x12/0xb0
[ 205.153195][ T12] process_one_work+0xe35/0x1650
[ 205.153384][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 205.153567][ T12] ? assign_work+0x168/0x240
[ 205.153757][ T12] worker_thread+0x591/0xcf0
[ 205.153942][ T12] ? rescuer_thread+0xd10/0xd10
[ 205.154118][ T12] kthread+0x37b/0x5f0
[ 205.154266][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 205.154449][ T12] ? ret_from_fork+0x1b/0x270
[ 205.154624][ T12] ? __lock_release+0x5d/0x170
[ 205.154801][ T12] ? rcu_is_watching+0x12/0xb0
[ 205.154983][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 205.155191][ T12] ret_from_fork+0x1db/0x270
[ 205.155384][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 205.155571][ T12] ret_from_fork_asm+0x11/0x20
[ 205.155749][ T12]
[ 205.155891][ T12] irq event stamp: 6683
[ 205.156021][ T12] hardirqs last enabled at (6683): [] finish_task_switch.isra.0+0x245/0x960
[ 205.156375][ T12] hardirqs last disabled at (6682): [] __schedule+0x94a/0x1b10
[ 205.156710][ T12] softirqs last enabled at (6600): [] handle_softirqs+0x352/0x610
[ 205.157116][ T12] softirqs last disabled at (6595): [] irq_exit_rcu+0xab/0x100
[ 205.157443][ T12] ---[ end trace 0000000000000000 ]---