[ 128.687941][ T12] ==================================================================
[ 128.688346][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 128.688629][ T12] Read of size 1 at addr ffff888007b016ac by task kworker/u16:0/12
[ 128.688860][ T12]
[ 128.688959][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 128.688967][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 128.688971][ T12] Workqueue: netns cleanup_net
[ 128.688985][ T12] Call Trace:
[ 128.688991][ T12]
[ 128.688994][ T12] dump_stack_lvl+0x82/0xc0
[ 128.689005][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 128.689023][ T12] ? kobject_put+0xbb/0xd0
[ 128.689027][ T12] print_report+0xb4/0x270
[ 128.689030][ T12] ? kobject_put+0xbb/0xd0
[ 128.689034][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 128.689037][ T12] ? kobject_put+0xbb/0xd0
[ 128.689040][ T12] kasan_report+0xca/0x100
[ 128.689045][ T12] ? kobject_put+0xbb/0xd0
[ 128.689050][ T12] kobject_put+0xbb/0xd0
[ 128.689054][ T12] netdev_run_todo+0x5f0/0xc60
[ 128.689060][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 128.689064][ T12] ? generic_xdp_install+0x410/0x410
[ 128.689071][ T12] ops_undo_list+0x714/0x890
[ 128.689080][ T12] ? netns_get+0x110/0x110
[ 128.689083][ T12] ? cleanup_net+0x2d6/0x830
[ 128.689088][ T12] cleanup_net+0x3b2/0x830
[ 128.689091][ T12] ? net_passive_dec+0x190/0x190
[ 128.689095][ T12] ? rcu_is_watching+0x12/0xb0
[ 128.689107][ T12] process_one_work+0xe35/0x1650
[ 128.689120][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 128.689126][ T12] ? assign_work+0x168/0x240
[ 128.689130][ T12] worker_thread+0x591/0xcf0
[ 128.689135][ T12] ? rescuer_thread+0xd10/0xd10
[ 128.689139][ T12] kthread+0x37b/0x5f0
[ 128.689144][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 128.689147][ T12] ? ret_from_fork+0x1b/0x270
[ 128.689161][ T12] ? __lock_release+0x5d/0x170
[ 128.689171][ T12] ? rcu_is_watching+0x12/0xb0
[ 128.689174][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 128.689178][ T12] ret_from_fork+0x1db/0x270
[ 128.689181][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 128.689184][ T12] ret_from_fork_asm+0x11/0x20
[ 128.689196][ T12]
[ 128.689198][ T12]
[ 128.695194][ T12] Allocated by task 251:
[ 128.695328][ T12] kasan_save_stack+0x24/0x40
[ 128.695499][ T12] kasan_save_track+0x14/0x30
[ 128.695658][ T12] __kasan_kmalloc+0x7b/0x90
[ 128.695820][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 128.695984][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 128.696146][ T12] sit_init_net+0x169/0x550
[ 128.696311][ T12] ops_init+0x189/0x550
[ 128.696434][ T12] setup_net+0xf1/0x380
[ 128.696559][ T12] copy_net_ns+0x21a/0x380
[ 128.696716][ T12] create_new_namespaces+0x35f/0x900
[ 128.696874][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 128.697028][ T12] ksys_unshare+0x2a3/0x660
[ 128.697182][ T12] __x64_sys_unshare+0x31/0x40
[ 128.697332][ T12] do_syscall_64+0xc1/0xfd0
[ 128.697489][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 128.697694][ T12]
[ 128.697779][ T12] Freed by task 12:
[ 128.697907][ T12] kasan_save_stack+0x24/0x40
[ 128.698070][ T12] kasan_save_track+0x14/0x30
[ 128.698252][ T12] __kasan_save_free_info+0x3b/0x60
[ 128.698407][ T12] __kasan_slab_free+0x3f/0x60
[ 128.698560][ T12] kfree+0x21d/0x540
[ 128.698680][ T12] device_release+0x9c/0x210
[ 128.698850][ T12] kobject_cleanup+0xfe/0x360
[ 128.699007][ T12] netdev_run_todo+0x81f/0xc60
[ 128.699162][ T12] ops_undo_list+0x714/0x890
[ 128.699316][ T12] cleanup_net+0x3b2/0x830
[ 128.699467][ T12] process_one_work+0xe35/0x1650
[ 128.699618][ T12] worker_thread+0x591/0xcf0
[ 128.699767][ T12] kthread+0x37b/0x5f0
[ 128.699884][ T12] ret_from_fork+0x1db/0x270
[ 128.700040][ T12] ret_from_fork_asm+0x11/0x20
[ 128.700195][ T12]
[ 128.700272][ T12] The buggy address belongs to the object at ffff888007b01000
[ 128.700272][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 128.700649][ T12] The buggy address is located 1708 bytes inside of
[ 128.700649][ T12] freed 4096-byte region [ffff888007b01000, ffff888007b02000)
[ 128.701028][ T12]
[ 128.701113][ T12] The buggy address belongs to the physical page:
[ 128.701312][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b00
[ 128.701586][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 128.701822][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 128.702036][ T12] page_type: f5(slab)
[ 128.702167][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000173e10 ffffea0000224210
[ 128.702452][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 128.702725][ T12] head: 0080000000000040 ffff888001043700 ffffea0000173e10 ffffea0000224210
[ 128.703007][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 128.703281][ T12] head: 0080000000000003 ffffea00001ec001 00000000ffffffff 00000000ffffffff
[ 128.703552][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 128.703837][ T12] page dumped because: kasan: bad access detected
[ 128.704028][ T12]
[ 128.704111][ T12] Memory state around the buggy address:
[ 128.704267][ T12] ffff888007b01580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 128.704497][ T12] ffff888007b01600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 128.704716][ T12] >ffff888007b01680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 128.704944][ T12] ^
[ 128.705101][ T12] ffff888007b01700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 128.705327][ T12] ffff888007b01780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 128.705549][ T12] ==================================================================
[ 128.706908][ T12] Disabling lock debugging due to kernel taint
[ 128.707138][ T12] ------------[ cut here ]------------
[ 128.707323][ T12] refcount_t: underflow; use-after-free.
[ 128.707578][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 128.707883][ T12] Modules linked in: nf_conntrack_netlink nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_numgen nf_tables
[ 128.708293][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 128.708662][ T12] Tainted: [B]=BAD_PAGE
[ 128.708807][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 128.709039][ T12] Workqueue: netns cleanup_net
[ 128.709229][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 128.710035][ 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 b8 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
[ 128.710669][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 128.710943][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 128.711258][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 128.711571][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff717e220
[ 128.711876][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 128.712188][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 128.712499][ T12] FS: 0000000000000000(0000) GS:ffff88807c2ec000(0000) knlGS:0000000000000000
[ 128.712839][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 128.713106][ T12] CR2: 00007f6590127000 CR3: 0000000029735001 CR4: 0000000000772ef0
[ 128.713426][ T12] PKRU: 55555554
[ 128.713617][ T12] Call Trace:
[ 128.713821][ T12]
[ 128.713982][ T12] netdev_run_todo+0x5f0/0xc60
[ 128.714217][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 128.714460][ T12] ? generic_xdp_install+0x410/0x410
[ 128.714688][ T12] ops_undo_list+0x714/0x890
[ 128.714922][ T12] ? netns_get+0x110/0x110
[ 128.715154][ T12] ? cleanup_net+0x2d6/0x830
[ 128.715386][ T12] cleanup_net+0x3b2/0x830
[ 128.715608][ T12] ? net_passive_dec+0x190/0x190
[ 128.715830][ T12] ? rcu_is_watching+0x12/0xb0
[ 128.716056][ T12] process_one_work+0xe35/0x1650
[ 128.716291][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 128.716518][ T12] ? assign_work+0x168/0x240
[ 128.716743][ T12] worker_thread+0x591/0xcf0
[ 128.716975][ T12] ? rescuer_thread+0xd10/0xd10
[ 128.717200][ T12] kthread+0x37b/0x5f0
[ 128.717395][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 128.717619][ T12] ? ret_from_fork+0x1b/0x270
[ 128.717845][ T12] ? __lock_release+0x5d/0x170
[ 128.718072][ T12] ? rcu_is_watching+0x12/0xb0
[ 128.718305][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 128.718530][ T12] ret_from_fork+0x1db/0x270
[ 128.718754][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 128.718983][ T12] ret_from_fork_asm+0x11/0x20
[ 128.719216][ T12]
[ 128.719421][ T12] irq event stamp: 2987
[ 128.719564][ T12] hardirqs last enabled at (2987): [] finish_task_switch.isra.0+0x245/0x960
[ 128.719899][ T12] hardirqs last disabled at (2986): [] __schedule+0x94a/0x1b10
[ 128.720204][ T12] softirqs last enabled at (1820): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 128.720544][ T12] softirqs last disabled at (1818): [] dev_mc_flush+0x54/0x90
[ 128.720833][ T12] ---[ end trace 0000000000000000 ]---