[ 13.573625][ T70] ==================================================================
[ 13.573943][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 13.574212][ T70] Read of size 1 at addr ffff888008d84694 by task kworker/u16:1/70
[ 13.574464][ T70]
[ 13.574554][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 13.574559][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.574562][ T70] Workqueue: netns cleanup_net
[ 13.574568][ T70] Call Trace:
[ 13.574570][ T70]
[ 13.574572][ T70] dump_stack_lvl+0x82/0xc0
[ 13.574577][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 13.574584][ T70] ? kobject_put+0xbb/0xd0
[ 13.574588][ T70] print_report+0xb4/0x270
[ 13.574591][ T70] ? kobject_put+0xbb/0xd0
[ 13.574594][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 13.574598][ T70] ? kobject_put+0xbb/0xd0
[ 13.574601][ T70] kasan_report+0xca/0x100
[ 13.574605][ T70] ? kobject_put+0xbb/0xd0
[ 13.574610][ T70] kobject_put+0xbb/0xd0
[ 13.574613][ T70] netdev_run_todo+0x5f0/0xc60
[ 13.574619][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 13.574623][ T70] ? generic_xdp_install+0x410/0x410
[ 13.574629][ T70] ops_undo_list+0x714/0x890
[ 13.574633][ T70] ? netns_get+0x110/0x110
[ 13.574635][ T70] ? cleanup_net+0x2d6/0x830
[ 13.574640][ T70] cleanup_net+0x3b2/0x830
[ 13.574643][ T70] ? net_passive_dec+0x190/0x190
[ 13.574647][ T70] ? rcu_is_watching+0x12/0xb0
[ 13.574653][ T70] process_one_work+0xe35/0x1650
[ 13.574660][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 13.574666][ T70] ? assign_work+0x168/0x240
[ 13.574669][ T70] worker_thread+0x591/0xcf0
[ 13.574674][ T70] ? rescuer_thread+0xd10/0xd10
[ 13.574677][ T70] kthread+0x37b/0x5f0
[ 13.574681][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.574683][ T70] ? ret_from_fork+0x1b/0x270
[ 13.574688][ T70] ? __lock_release+0x5d/0x170
[ 13.574693][ T70] ? rcu_is_watching+0x12/0xb0
[ 13.574696][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.574699][ T70] ret_from_fork+0x1db/0x270
[ 13.574702][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.574704][ T70] ret_from_fork_asm+0x11/0x20
[ 13.574712][ T70]
[ 13.574713][ T70]
[ 13.582002][ T70] Allocated by task 228:
[ 13.582118][ T70] kasan_save_stack+0x24/0x40
[ 13.582279][ T70] kasan_save_track+0x14/0x30
[ 13.582436][ T70] __kasan_kmalloc+0x7b/0x90
[ 13.582590][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 13.582842][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 13.583004][ T70] sit_init_net+0x169/0x550
[ 13.583159][ T70] ops_init+0x189/0x550
[ 13.583274][ T70] setup_net+0xf1/0x380
[ 13.583392][ T70] copy_net_ns+0x21a/0x380
[ 13.583634][ T70] create_new_namespaces+0x35f/0x900
[ 13.583815][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 13.583980][ T70] ksys_unshare+0x2a3/0x660
[ 13.584139][ T70] __x64_sys_unshare+0x31/0x40
[ 13.584441][ T70] do_syscall_64+0xc1/0xfd0
[ 13.584605][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 13.584835][ T70]
[ 13.584920][ T70] Freed by task 70:
[ 13.585184][ T70] kasan_save_stack+0x24/0x40
[ 13.585347][ T70] kasan_save_track+0x14/0x30
[ 13.585503][ T70] __kasan_save_free_info+0x3b/0x60
[ 13.585661][ T70] __kasan_slab_free+0x3f/0x60
[ 13.585906][ T70] kfree+0x21d/0x540
[ 13.586031][ T70] device_release+0x9c/0x210
[ 13.586187][ T70] kobject_cleanup+0xfe/0x360
[ 13.586381][ T70] netdev_run_todo+0x81f/0xc60
[ 13.586664][ T70] ops_undo_list+0x714/0x890
[ 13.586863][ T70] cleanup_net+0x3b2/0x830
[ 13.587031][ T70] process_one_work+0xe35/0x1650
[ 13.587245][ T70] worker_thread+0x591/0xcf0
[ 13.587399][ T70] kthread+0x37b/0x5f0
[ 13.587522][ T70] ret_from_fork+0x1db/0x270
[ 13.587721][ T70] ret_from_fork_asm+0x11/0x20
[ 13.587883][ T70]
[ 13.587971][ T70] The buggy address belongs to the object at ffff888008d84000
[ 13.587971][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 13.588338][ T70] The buggy address is located 1684 bytes inside of
[ 13.588338][ T70] freed 4096-byte region [ffff888008d84000, ffff888008d85000)
[ 13.588871][ T70]
[ 13.588983][ T70] The buggy address belongs to the physical page:
[ 13.589291][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d80
[ 13.589642][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 13.589986][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 13.590183][ T70] page_type: f5(slab)
[ 13.590304][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000079210 ffffea000021cc10
[ 13.590680][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 13.590966][ T70] head: 0080000000000040 ffff888001043700 ffffea0000079210 ffffea000021cc10
[ 13.591335][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 13.591604][ T70] head: 0080000000000003 ffffea0000236001 00000000ffffffff 00000000ffffffff
[ 13.591884][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 13.592157][ T70] page dumped because: kasan: bad access detected
[ 13.592344][ T70]
[ 13.592419][ T70] Memory state around the buggy address:
[ 13.592649][ T70] ffff888008d84580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.592885][ T70] ffff888008d84600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.593163][ T70] >ffff888008d84680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.593467][ T70] ^
[ 13.593615][ T70] ffff888008d84700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.593843][ T70] ffff888008d84780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.594191][ T70] ==================================================================
[ 13.594918][ T70] Disabling lock debugging due to kernel taint
[ 13.595568][ T70] ------------[ cut here ]------------
[ 13.595719][ T70] refcount_t: underflow; use-after-free.
[ 13.595893][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 13.596218][ T70] Modules linked in: veth
[ 13.596396][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 13.596736][ T70] Tainted: [B]=BAD_PAGE
[ 13.596851][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.597058][ T70] Workqueue: netns cleanup_net
[ 13.597221][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 13.597499][ T70] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d 85 b4 e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 13.598130][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 13.598320][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 13.598551][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 13.598837][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6a3e134
[ 13.599140][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 13.599419][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 13.599666][ T70] FS: 0000000000000000(0000) GS:ffff88807fc10000(0000) knlGS:0000000000000000
[ 13.599993][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 13.600305][ T70] CR2: 00007f6838151000 CR3: 000000002e735003 CR4: 0000000000772ef0
[ 13.600598][ T70] PKRU: 55555554
[ 13.600719][ T70] Call Trace:
[ 13.600932][ T70]
[ 13.601015][ T70] netdev_run_todo+0x5f0/0xc60
[ 13.601182][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 13.601335][ T70] ? generic_xdp_install+0x410/0x410
[ 13.601634][ T70] ops_undo_list+0x714/0x890
[ 13.601944][ T70] ? netns_get+0x110/0x110
[ 13.602103][ T70] ? cleanup_net+0x2d6/0x830
[ 13.602253][ T70] cleanup_net+0x3b2/0x830
[ 13.602405][ T70] ? net_passive_dec+0x190/0x190
[ 13.602758][ T70] ? rcu_is_watching+0x12/0xb0
[ 13.602925][ T70] process_one_work+0xe35/0x1650
[ 13.603093][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 13.603252][ T70] ? assign_work+0x168/0x240
[ 13.603401][ T70] worker_thread+0x591/0xcf0
[ 13.603551][ T70] ? rescuer_thread+0xd10/0xd10
[ 13.603701][ T70] kthread+0x37b/0x5f0
[ 13.603816][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.604115][ T70] ? ret_from_fork+0x1b/0x270
[ 13.604298][ T70] ? __lock_release+0x5d/0x170
[ 13.604450][ T70] ? rcu_is_watching+0x12/0xb0
[ 13.604602][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.604841][ T70] ret_from_fork+0x1db/0x270
[ 13.605053][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.605273][ T70] ret_from_fork_asm+0x11/0x20
[ 13.605427][ T70]
[ 13.605542][ T70] irq event stamp: 2769
[ 13.605656][ T70] hardirqs last enabled at (2769): [] finish_task_switch.isra.0+0x245/0x960
[ 13.605968][ T70] hardirqs last disabled at (2768): [] __schedule+0x94a/0x1b10
[ 13.606327][ T70] softirqs last enabled at (2326): [] handle_softirqs+0x352/0x610
[ 13.606589][ T70] softirqs last disabled at (2287): [] irq_exit_rcu+0xab/0x100
[ 13.607032][ T70] ---[ end trace 0000000000000000 ]---