[ 16.381312][ T70] ==================================================================
[ 16.381673][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.381955][ T70] Read of size 1 at addr ffff888002a6c694 by task kworker/u16:1/70
[ 16.382244][ T70]
[ 16.382345][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.382350][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.382353][ T70] Workqueue: netns cleanup_net
[ 16.382362][ T70] Call Trace:
[ 16.382364][ T70]
[ 16.382367][ T70] dump_stack_lvl+0x82/0xc0
[ 16.382375][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 16.382384][ T70] ? kobject_put+0xbb/0xd0
[ 16.382388][ T70] print_report+0xb4/0x270
[ 16.382391][ T70] ? kobject_put+0xbb/0xd0
[ 16.382395][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 16.382399][ T70] ? kobject_put+0xbb/0xd0
[ 16.382401][ T70] kasan_report+0xca/0x100
[ 16.382406][ T70] ? kobject_put+0xbb/0xd0
[ 16.382411][ T70] kobject_put+0xbb/0xd0
[ 16.382414][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.382421][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.382425][ T70] ? generic_xdp_install+0x410/0x410
[ 16.382432][ T70] ops_undo_list+0x714/0x890
[ 16.382436][ T70] ? netns_get+0x110/0x110
[ 16.382438][ T70] ? cleanup_net+0x2d6/0x830
[ 16.382443][ T70] cleanup_net+0x3b2/0x830
[ 16.382446][ T70] ? net_passive_dec+0x190/0x190
[ 16.382450][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.382457][ T70] process_one_work+0xe35/0x1650
[ 16.382465][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.382470][ T70] ? assign_work+0x168/0x240
[ 16.382474][ T70] worker_thread+0x591/0xcf0
[ 16.382479][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.382482][ T70] kthread+0x37b/0x5f0
[ 16.382486][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.382488][ T70] ? ret_from_fork+0x1b/0x270
[ 16.382495][ T70] ? __lock_release+0x5d/0x170
[ 16.382501][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.382504][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.382507][ T70] ret_from_fork+0x1db/0x270
[ 16.382510][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.382512][ T70] ret_from_fork_asm+0x11/0x20
[ 16.382521][ T70]
[ 16.382523][ T70]
[ 16.389250][ T70] Allocated by task 228:
[ 16.389398][ T70] kasan_save_stack+0x24/0x40
[ 16.389583][ T70] kasan_save_track+0x14/0x30
[ 16.389762][ T70] __kasan_kmalloc+0x7b/0x90
[ 16.389940][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.390124][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 16.390317][ T70] sit_init_net+0x169/0x550
[ 16.390519][ T70] ops_init+0x189/0x550
[ 16.390654][ T70] setup_net+0xf1/0x380
[ 16.390779][ T70] copy_net_ns+0x21a/0x380
[ 16.390965][ T70] create_new_namespaces+0x35f/0x900
[ 16.391147][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 16.391371][ T70] ksys_unshare+0x2a3/0x660
[ 16.391566][ T70] __x64_sys_unshare+0x31/0x40
[ 16.391739][ T70] do_syscall_64+0xc1/0xfd0
[ 16.391930][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.392179][ T70]
[ 16.392288][ T70] Freed by task 70:
[ 16.392421][ T70] kasan_save_stack+0x24/0x40
[ 16.392616][ T70] kasan_save_track+0x14/0x30
[ 16.392796][ T70] __kasan_save_free_info+0x3b/0x60
[ 16.392983][ T70] __kasan_slab_free+0x3f/0x60
[ 16.393179][ T70] kfree+0x21d/0x540
[ 16.393372][ T70] device_release+0x9c/0x210
[ 16.393573][ T70] kobject_cleanup+0xfe/0x360
[ 16.393753][ T70] netdev_run_todo+0x81f/0xc60
[ 16.393962][ T70] ops_undo_list+0x714/0x890
[ 16.394165][ T70] cleanup_net+0x3b2/0x830
[ 16.394364][ T70] process_one_work+0xe35/0x1650
[ 16.394576][ T70] worker_thread+0x591/0xcf0
[ 16.394753][ T70] kthread+0x37b/0x5f0
[ 16.394902][ T70] ret_from_fork+0x1db/0x270
[ 16.395107][ T70] ret_from_fork_asm+0x11/0x20
[ 16.395321][ T70]
[ 16.395414][ T70] The buggy address belongs to the object at ffff888002a6c000
[ 16.395414][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 16.395871][ T70] The buggy address is located 1684 bytes inside of
[ 16.395871][ T70] freed 4096-byte region [ffff888002a6c000, ffff888002a6d000)
[ 16.396352][ T70]
[ 16.396445][ T70] The buggy address belongs to the physical page:
[ 16.396674][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a68
[ 16.397030][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.397366][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.397615][ T70] page_type: f5(slab)
[ 16.397751][ T70] raw: 0080000000000040 ffff888001043700 ffffea00001f3610 ffffea00001dac10
[ 16.398141][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.398500][ T70] head: 0080000000000040 ffff888001043700 ffffea00001f3610 ffffea00001dac10
[ 16.398846][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.399365][ T70] head: 0080000000000003 ffffea00000a9a01 00000000ffffffff 00000000ffffffff
[ 16.399873][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.400357][ T70] page dumped because: kasan: bad access detected
[ 16.400682][ T70]
[ 16.400810][ T70] Memory state around the buggy address:
[ 16.401070][ T70] ffff888002a6c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.401452][ T70] ffff888002a6c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.401823][ T70] >ffff888002a6c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.402203][ T70] ^
[ 16.402455][ T70] ffff888002a6c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.402818][ T70] ffff888002a6c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.403199][ T70] ==================================================================
[ 16.403740][ T70] Disabling lock debugging due to kernel taint
[ 16.403974][ T70] ------------[ cut here ]------------
[ 16.404131][ T70] refcount_t: underflow; use-after-free.
[ 16.404373][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.404657][ T70] Modules linked in: veth
[ 16.404798][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.405176][ T70] Tainted: [B]=BAD_PAGE
[ 16.405336][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.405548][ T70] Workqueue: netns cleanup_net
[ 16.405725][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.405968][ 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 25 86 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
[ 16.406579][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 16.406821][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.407105][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.407378][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0d7e134
[ 16.407638][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 16.407937][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.408200][ T70] FS: 0000000000000000(0000) GS:ffff8880ae210000(0000) knlGS:0000000000000000
[ 16.408513][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.408743][ T70] CR2: 00007fa7ef4cfd40 CR3: 000000000913d005 CR4: 0000000000772ef0
[ 16.408988][ T70] PKRU: 55555554
[ 16.409117][ T70] Call Trace:
[ 16.409242][ T70]
[ 16.409326][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.409498][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.409659][ T70] ? generic_xdp_install+0x410/0x410
[ 16.409827][ T70] ops_undo_list+0x714/0x890
[ 16.410026][ T70] ? netns_get+0x110/0x110
[ 16.410201][ T70] ? cleanup_net+0x2d6/0x830
[ 16.410366][ T70] cleanup_net+0x3b2/0x830
[ 16.410558][ T70] ? net_passive_dec+0x190/0x190
[ 16.410724][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.410907][ T70] process_one_work+0xe35/0x1650
[ 16.411067][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.411257][ T70] ? assign_work+0x168/0x240
[ 16.411440][ T70] worker_thread+0x591/0xcf0
[ 16.411608][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.411782][ T70] kthread+0x37b/0x5f0
[ 16.411918][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.412079][ T70] ? ret_from_fork+0x1b/0x270
[ 16.412355][ T70] ? __lock_release+0x5d/0x170
[ 16.412527][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.412691][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.412858][ T70] ret_from_fork+0x1db/0x270
[ 16.413211][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.413390][ T70] ret_from_fork_asm+0x11/0x20
[ 16.413563][ T70]
[ 16.413687][ T70] irq event stamp: 2789
[ 16.413901][ T70] hardirqs last enabled at (2789): [] irqentry_exit+0x3b/0x80
[ 16.414227][ T70] hardirqs last disabled at (2788): [] handle_softirqs+0x47f/0x610
[ 16.414539][ T70] softirqs last enabled at (2512): [] handle_softirqs+0x352/0x610
[ 16.414919][ T70] softirqs last disabled at (2505): [] irq_exit_rcu+0xab/0x100
[ 16.415250][ T70] ---[ end trace 0000000000000000 ]---