[ 16.198376][ T70] ==================================================================
[ 16.198756][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.199043][ T70] Read of size 1 at addr ffff8880093c4694 by task kworker/u16:1/70
[ 16.199315][ T70]
[ 16.199443][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.199449][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.199453][ T70] Workqueue: netns cleanup_net
[ 16.199461][ T70] Call Trace:
[ 16.199463][ T70]
[ 16.199471][ T70] dump_stack_lvl+0x82/0xc0
[ 16.199477][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 16.199486][ T70] ? kobject_put+0xbb/0xd0
[ 16.199496][ T70] print_report+0xb4/0x270
[ 16.199500][ T70] ? kobject_put+0xbb/0xd0
[ 16.199509][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 16.199513][ T70] ? kobject_put+0xbb/0xd0
[ 16.199516][ T70] kasan_report+0xca/0x100
[ 16.199521][ T70] ? kobject_put+0xbb/0xd0
[ 16.199526][ T70] kobject_put+0xbb/0xd0
[ 16.199530][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.199536][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.199540][ T70] ? generic_xdp_install+0x410/0x410
[ 16.199547][ T70] ops_undo_list+0x714/0x890
[ 16.199551][ T70] ? netns_get+0x110/0x110
[ 16.199553][ T70] ? cleanup_net+0x2d6/0x830
[ 16.199558][ T70] cleanup_net+0x3b2/0x830
[ 16.199561][ T70] ? net_passive_dec+0x190/0x190
[ 16.199565][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.199570][ T70] process_one_work+0xe35/0x1650
[ 16.199578][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.199583][ T70] ? assign_work+0x168/0x240
[ 16.199587][ T70] worker_thread+0x591/0xcf0
[ 16.199592][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.199595][ T70] kthread+0x37b/0x5f0
[ 16.199598][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.199600][ T70] ? ret_from_fork+0x1b/0x270
[ 16.199606][ T70] ? __lock_release+0x5d/0x170
[ 16.199612][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.199615][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.199618][ T70] ret_from_fork+0x1db/0x270
[ 16.199620][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.199623][ T70] ret_from_fork_asm+0x11/0x20
[ 16.199631][ T70]
[ 16.199632][ T70]
[ 16.208463][ T70] Allocated by task 228:
[ 16.208634][ T70] kasan_save_stack+0x24/0x40
[ 16.208849][ T70] kasan_save_track+0x14/0x30
[ 16.209020][ T70] __kasan_kmalloc+0x7b/0x90
[ 16.209202][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.209439][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 16.209677][ T70] sit_init_net+0x169/0x550
[ 16.209889][ T70] ops_init+0x189/0x550
[ 16.210040][ T70] setup_net+0xf1/0x380
[ 16.210171][ T70] copy_net_ns+0x21a/0x380
[ 16.210368][ T70] create_new_namespaces+0x35f/0x900
[ 16.210590][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 16.210860][ T70] ksys_unshare+0x2a3/0x660
[ 16.211154][ T70] __x64_sys_unshare+0x31/0x40
[ 16.211395][ T70] do_syscall_64+0xc1/0xfd0
[ 16.211618][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.211833][ T70]
[ 16.211926][ T70] Freed by task 70:
[ 16.212048][ T70] kasan_save_stack+0x24/0x40
[ 16.212305][ T70] kasan_save_track+0x14/0x30
[ 16.212627][ T70] __kasan_save_free_info+0x3b/0x60
[ 16.212835][ T70] __kasan_slab_free+0x3f/0x60
[ 16.213055][ T70] kfree+0x21d/0x540
[ 16.213186][ T70] device_release+0x9c/0x210
[ 16.213370][ T70] kobject_cleanup+0xfe/0x360
[ 16.213566][ T70] netdev_run_todo+0x81f/0xc60
[ 16.213748][ T70] ops_undo_list+0x714/0x890
[ 16.213985][ T70] cleanup_net+0x3b2/0x830
[ 16.214232][ T70] process_one_work+0xe35/0x1650
[ 16.214479][ T70] worker_thread+0x591/0xcf0
[ 16.214643][ T70] kthread+0x37b/0x5f0
[ 16.214791][ T70] ret_from_fork+0x1db/0x270
[ 16.214963][ T70] ret_from_fork_asm+0x11/0x20
[ 16.215136][ T70]
[ 16.215223][ T70] The buggy address belongs to the object at ffff8880093c4000
[ 16.215223][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 16.215665][ T70] The buggy address is located 1684 bytes inside of
[ 16.215665][ T70] freed 4096-byte region [ffff8880093c4000, ffff8880093c5000)
[ 16.216075][ T70]
[ 16.216195][ T70] The buggy address belongs to the physical page:
[ 16.216503][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x93c0
[ 16.216870][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.217132][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.217384][ T70] page_type: f5(slab)
[ 16.217531][ T70] raw: 0080000000000040 ffff888001043700 ffffea000022a210 ffffea000023fa10
[ 16.217860][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.218167][ T70] head: 0080000000000040 ffff888001043700 ffffea000022a210 ffffea000023fa10
[ 16.218552][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.218989][ T70] head: 0080000000000003 ffffea000024f001 00000000ffffffff 00000000ffffffff
[ 16.219321][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.219651][ T70] page dumped because: kasan: bad access detected
[ 16.219885][ T70]
[ 16.219982][ T70] Memory state around the buggy address:
[ 16.220149][ T70] ffff8880093c4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.220418][ T70] ffff8880093c4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.220701][ T70] >ffff8880093c4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.220948][ T70] ^
[ 16.221136][ T70] ffff8880093c4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.221469][ T70] ffff8880093c4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.221794][ T70] ==================================================================
[ 16.222257][ T70] Disabling lock debugging due to kernel taint
[ 16.222477][ T70] ------------[ cut here ]------------
[ 16.222651][ T70] refcount_t: underflow; use-after-free.
[ 16.222891][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.223926][ T70] Modules linked in: veth
[ 16.224135][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.224593][ T70] Tainted: [B]=BAD_PAGE
[ 16.224790][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.224998][ T70] Workqueue: netns cleanup_net
[ 16.225272][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.225610][ 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 e5 9a 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
[ 16.226279][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 16.226532][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.226786][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.227054][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff36fe134
[ 16.227314][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 16.227647][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.227907][ T70] FS: 0000000000000000(0000) GS:ffff888099610000(0000) knlGS:0000000000000000
[ 16.228258][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.228570][ T70] CR2: 00005578af3c5370 CR3: 00000000098a6001 CR4: 0000000000772ef0
[ 16.228875][ T70] PKRU: 55555554
[ 16.229002][ T70] Call Trace:
[ 16.229135][ T70]
[ 16.229238][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.229420][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.229590][ T70] ? generic_xdp_install+0x410/0x410
[ 16.229764][ T70] ops_undo_list+0x714/0x890
[ 16.229926][ T70] ? netns_get+0x110/0x110
[ 16.230108][ T70] ? cleanup_net+0x2d6/0x830
[ 16.230301][ T70] cleanup_net+0x3b2/0x830
[ 16.230471][ T70] ? net_passive_dec+0x190/0x190
[ 16.230635][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.230810][ T70] process_one_work+0xe35/0x1650
[ 16.231016][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.231202][ T70] ? assign_work+0x168/0x240
[ 16.231370][ T70] worker_thread+0x591/0xcf0
[ 16.231567][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.231737][ T70] kthread+0x37b/0x5f0
[ 16.231862][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.232019][ T70] ? ret_from_fork+0x1b/0x270
[ 16.232241][ T70] ? __lock_release+0x5d/0x170
[ 16.232428][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.232617][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.232825][ T70] ret_from_fork+0x1db/0x270
[ 16.233028][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.233237][ T70] ret_from_fork_asm+0x11/0x20
[ 16.233430][ T70]
[ 16.233585][ T70] irq event stamp: 2715
[ 16.233747][ T70] hardirqs last enabled at (2715): [] finish_task_switch.isra.0+0x245/0x960
[ 16.234090][ T70] hardirqs last disabled at (2714): [] __schedule+0x94a/0x1b10
[ 16.234387][ T70] softirqs last enabled at (2622): [] handle_softirqs+0x352/0x610
[ 16.234679][ T70] softirqs last disabled at (2615): [] irq_exit_rcu+0xab/0x100
[ 16.235026][ T70] ---[ end trace 0000000000000000 ]---