[ 24.236749][ T70] ==================================================================
[ 24.237052][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 24.237327][ T70] Read of size 1 at addr ffff88800759969c by task kworker/u16:1/70
[ 24.237573][ T70]
[ 24.237664][ T70] CPU: 1 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 24.237669][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 24.237672][ T70] Workqueue: netns cleanup_net
[ 24.237682][ T70] Call Trace:
[ 24.237687][ T70]
[ 24.237689][ T70] dump_stack_lvl+0x82/0xc0
[ 24.237697][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 24.237706][ T70] ? kobject_put+0xbb/0xd0
[ 24.237710][ T70] print_report+0xb4/0x270
[ 24.237713][ T70] ? kobject_put+0xbb/0xd0
[ 24.237716][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 24.237719][ T70] ? kobject_put+0xbb/0xd0
[ 24.237722][ T70] kasan_report+0xca/0x100
[ 24.237726][ T70] ? kobject_put+0xbb/0xd0
[ 24.237731][ T70] kobject_put+0xbb/0xd0
[ 24.237734][ T70] netdev_run_todo+0x5f0/0xc60
[ 24.237742][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 24.237746][ T70] ? generic_xdp_install+0x410/0x410
[ 24.237752][ T70] ops_undo_list+0x714/0x890
[ 24.237757][ T70] ? netns_get+0x110/0x110
[ 24.237762][ T70] ? cleanup_net+0x2d6/0x830
[ 24.237767][ T70] cleanup_net+0x3b2/0x830
[ 24.237771][ T70] ? net_passive_dec+0x190/0x190
[ 24.237775][ T70] ? rcu_is_watching+0x12/0xb0
[ 24.237785][ T70] process_one_work+0xe35/0x1650
[ 24.237796][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 24.237802][ T70] ? assign_work+0x168/0x240
[ 24.237806][ T70] worker_thread+0x591/0xcf0
[ 24.237812][ T70] ? rescuer_thread+0xd10/0xd10
[ 24.237816][ T70] kthread+0x37b/0x5f0
[ 24.237821][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.237824][ T70] ? ret_from_fork+0x1b/0x270
[ 24.237830][ T70] ? __lock_release+0x5d/0x170
[ 24.237836][ T70] ? rcu_is_watching+0x12/0xb0
[ 24.237839][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.237843][ T70] ret_from_fork+0x1db/0x270
[ 24.237846][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.237849][ T70] ret_from_fork_asm+0x11/0x20
[ 24.237861][ T70]
[ 24.237863][ T70]
[ 24.244603][ T70] Allocated by task 319:
[ 24.244730][ T70] kasan_save_stack+0x24/0x40
[ 24.244907][ T70] kasan_save_track+0x14/0x30
[ 24.245078][ T70] __kasan_kmalloc+0x7b/0x90
[ 24.245336][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 24.245504][ T70] alloc_netdev_mqs+0x7d/0x1370
[ 24.245674][ T70] sit_init_net+0x169/0x550
[ 24.245850][ T70] ops_init+0x189/0x550
[ 24.246073][ T70] setup_net+0xf1/0x380
[ 24.246201][ T70] copy_net_ns+0x21a/0x380
[ 24.246376][ T70] create_new_namespaces+0x35f/0x900
[ 24.246545][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 24.246805][ T70] ksys_unshare+0x2a3/0x660
[ 24.246979][ T70] __x64_sys_unshare+0x31/0x40
[ 24.247151][ T70] do_syscall_64+0xc1/0xfd0
[ 24.247337][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 24.247635][ T70]
[ 24.247722][ T70] Freed by task 70:
[ 24.247850][ T70] kasan_save_stack+0x24/0x40
[ 24.248021][ T70] kasan_save_track+0x14/0x30
[ 24.248190][ T70] __kasan_save_free_info+0x3b/0x60
[ 24.248447][ T70] __kasan_slab_free+0x3f/0x60
[ 24.248616][ T70] kfree+0x21d/0x540
[ 24.248746][ T70] device_release+0x9c/0x210
[ 24.248925][ T70] kobject_cleanup+0xfe/0x360
[ 24.249181][ T70] netdev_run_todo+0x81f/0xc60
[ 24.249354][ T70] ops_undo_list+0x714/0x890
[ 24.249523][ T70] cleanup_net+0x3b2/0x830
[ 24.249693][ T70] process_one_work+0xe35/0x1650
[ 24.249951][ T70] worker_thread+0x591/0xcf0
[ 24.250121][ T70] kthread+0x37b/0x5f0
[ 24.250247][ T70] ret_from_fork+0x1db/0x270
[ 24.250416][ T70] ret_from_fork_asm+0x11/0x20
[ 24.250675][ T70]
[ 24.250764][ T70] The buggy address belongs to the object at ffff888007599000
[ 24.250764][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 24.251174][ T70] The buggy address is located 1692 bytes inside of
[ 24.251174][ T70] freed 4096-byte region [ffff888007599000, ffff88800759a000)
[ 24.251668][ T70]
[ 24.251753][ T70] The buggy address belongs to the physical page:
[ 24.251960][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7598
[ 24.252355][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 24.252611][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 24.252919][ T70] page_type: f5(slab)
[ 24.253059][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000222810 ffffea000013d210
[ 24.253373][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 24.253775][ T70] head: 0080000000000040 ffff888001043700 ffffea0000222810 ffffea000013d210
[ 24.254093][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 24.254396][ T70] head: 0080000000000003 ffffea00001d6601 00000000ffffffff 00000000ffffffff
[ 24.254792][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 24.255094][ T70] page dumped because: kasan: bad access detected
[ 24.255391][ T70]
[ 24.255473][ T70] Memory state around the buggy address:
[ 24.255637][ T70] ffff888007599580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.255884][ T70] ffff888007599600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.256214][ T70] >ffff888007599680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.256463][ T70] ^
[ 24.256626][ T70] ffff888007599700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.256893][ T70] ffff888007599780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.257134][ T70] ==================================================================
[ 24.257572][ T70] Disabling lock debugging due to kernel taint
[ 24.257905][ T70] ------------[ cut here ]------------
[ 24.258082][ T70] refcount_t: underflow; use-after-free.
[ 24.258325][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 24.258653][ T70] Modules linked in:
[ 24.258812][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 24.259227][ T70] Tainted: [B]=BAD_PAGE
[ 24.259371][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 24.259603][ T70] Workqueue: netns cleanup_net
[ 24.259823][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 24.260063][ T70] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d 65 a5 e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 24.260718][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 24.260956][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 24.261230][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 24.261505][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4c02934
[ 24.261802][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 24.262083][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 24.262361][ T70] FS: 0000000000000000(0000) GS:ffff888088f84000(0000) knlGS:0000000000000000
[ 24.262695][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 24.262927][ T70] CR2: 00007f4f1a248920 CR3: 000000000a80c001 CR4: 0000000000772ef0
[ 24.263211][ T70] PKRU: 55555554
[ 24.263358][ T70] Call Trace:
[ 24.263486][ T70]
[ 24.263573][ T70] netdev_run_todo+0x5f0/0xc60
[ 24.263761][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 24.263942][ T70] ? generic_xdp_install+0x410/0x410
[ 24.264117][ T70] ops_undo_list+0x714/0x890
[ 24.264302][ T70] ? netns_get+0x110/0x110
[ 24.264482][ T70] ? cleanup_net+0x2d6/0x830
[ 24.264675][ T70] cleanup_net+0x3b2/0x830
[ 24.264867][ T70] ? net_passive_dec+0x190/0x190
[ 24.265054][ T70] ? rcu_is_watching+0x12/0xb0
[ 24.265241][ T70] process_one_work+0xe35/0x1650
[ 24.265514][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 24.265710][ T70] ? assign_work+0x168/0x240
[ 24.265898][ T70] worker_thread+0x591/0xcf0
[ 24.266074][ T70] ? rescuer_thread+0xd10/0xd10
[ 24.266340][ T70] kthread+0x37b/0x5f0
[ 24.266481][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.266673][ T70] ? ret_from_fork+0x1b/0x270
[ 24.266869][ T70] ? __lock_release+0x5d/0x170
[ 24.267056][ T70] ? rcu_is_watching+0x12/0xb0
[ 24.267235][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.267429][ T70] ret_from_fork+0x1db/0x270
[ 24.267615][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 24.267903][ T70] ret_from_fork_asm+0x11/0x20
[ 24.268098][ T70]
[ 24.268247][ T70] irq event stamp: 9405
[ 24.268387][ T70] hardirqs last enabled at (9405): [] finish_task_switch.isra.0+0x245/0x960
[ 24.268768][ T70] hardirqs last disabled at (9404): [] __schedule+0x94a/0x1b10
[ 24.269093][ T70] softirqs last enabled at (9230): [] handle_softirqs+0x352/0x610
[ 24.269500][ T70] softirqs last disabled at (9145): [] irq_exit_rcu+0xab/0x100
[ 24.269847][ T70] ---[ end trace 0000000000000000 ]---
[ 29.951005][ T388] netem: version 1.3