[ 16.190024][ T12] ==================================================================
[ 16.190418][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.190700][ T12] Read of size 1 at addr ffff888007c84694 by task kworker/u16:0/12
[ 16.190983][ T12]
[ 16.191086][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.191094][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.191098][ T12] Workqueue: netns cleanup_net
[ 16.191109][ T12] Call Trace:
[ 16.191112][ T12]
[ 16.191115][ T12] dump_stack_lvl+0x82/0xc0
[ 16.191123][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.191132][ T12] ? kobject_put+0xbb/0xd0
[ 16.191136][ T12] print_report+0xb4/0x270
[ 16.191139][ T12] ? kobject_put+0xbb/0xd0
[ 16.191142][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.191146][ T12] ? kobject_put+0xbb/0xd0
[ 16.191149][ T12] kasan_report+0xca/0x100
[ 16.191153][ T12] ? kobject_put+0xbb/0xd0
[ 16.191159][ T12] kobject_put+0xbb/0xd0
[ 16.191162][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.191169][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.191176][ T12] ? generic_xdp_install+0x410/0x410
[ 16.191186][ T12] ops_undo_list+0x714/0x890
[ 16.191193][ T12] ? netns_get+0x110/0x110
[ 16.191196][ T12] ? cleanup_net+0x2d6/0x830
[ 16.191202][ T12] cleanup_net+0x3b2/0x830
[ 16.191206][ T12] ? net_passive_dec+0x190/0x190
[ 16.191209][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.191216][ T12] process_one_work+0xe35/0x1650
[ 16.191224][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.191229][ T12] ? assign_work+0x168/0x240
[ 16.191234][ T12] worker_thread+0x591/0xcf0
[ 16.191239][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.191242][ T12] kthread+0x37b/0x5f0
[ 16.191246][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.191248][ T12] ? ret_from_fork+0x1b/0x270
[ 16.191255][ T12] ? __lock_release+0x5d/0x170
[ 16.191264][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.191268][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.191273][ T12] ret_from_fork+0x1db/0x270
[ 16.191277][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.191280][ T12] ret_from_fork_asm+0x11/0x20
[ 16.191290][ T12]
[ 16.191292][ T12]
[ 16.200279][ T12] Allocated by task 228:
[ 16.200482][ T12] kasan_save_stack+0x24/0x40
[ 16.200776][ T12] kasan_save_track+0x14/0x30
[ 16.201049][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.201333][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.201608][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.201886][ T12] sit_init_net+0x169/0x550
[ 16.202155][ T12] ops_init+0x189/0x550
[ 16.202395][ T12] setup_net+0xf1/0x380
[ 16.202606][ T12] copy_net_ns+0x21a/0x380
[ 16.202879][ T12] create_new_namespaces+0x35f/0x900
[ 16.203113][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.203323][ T12] ksys_unshare+0x2a3/0x660
[ 16.203498][ T12] __x64_sys_unshare+0x31/0x40
[ 16.203681][ T12] do_syscall_64+0xc1/0xfd0
[ 16.203860][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.204063][ T12]
[ 16.204151][ T12] Freed by task 12:
[ 16.204281][ T12] kasan_save_stack+0x24/0x40
[ 16.204454][ T12] kasan_save_track+0x14/0x30
[ 16.204629][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.204804][ T12] __kasan_slab_free+0x3f/0x60
[ 16.204973][ T12] kfree+0x21d/0x540
[ 16.205095][ T12] device_release+0x9c/0x210
[ 16.205301][ T12] kobject_cleanup+0xfe/0x360
[ 16.205463][ T12] netdev_run_todo+0x81f/0xc60
[ 16.205623][ T12] ops_undo_list+0x714/0x890
[ 16.205796][ T12] cleanup_net+0x3b2/0x830
[ 16.205964][ T12] process_one_work+0xe35/0x1650
[ 16.206137][ T12] worker_thread+0x591/0xcf0
[ 16.206323][ T12] kthread+0x37b/0x5f0
[ 16.206489][ T12] ret_from_fork+0x1db/0x270
[ 16.206684][ T12] ret_from_fork_asm+0x11/0x20
[ 16.206851][ T12]
[ 16.206937][ T12] The buggy address belongs to the object at ffff888007c84000
[ 16.206937][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.207405][ T12] The buggy address is located 1684 bytes inside of
[ 16.207405][ T12] freed 4096-byte region [ffff888007c84000, ffff888007c85000)
[ 16.207832][ T12]
[ 16.207918][ T12] The buggy address belongs to the physical page:
[ 16.208133][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c80
[ 16.208445][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.208693][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.208920][ T12] page_type: f5(slab)
[ 16.209053][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000297e10 ffffea0000163a10
[ 16.209366][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.209654][ T12] head: 0080000000000040 ffff888001043700 ffffea0000297e10 ffffea0000163a10
[ 16.209962][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.210289][ T12] head: 0080000000000003 ffffea00001f2001 00000000ffffffff 00000000ffffffff
[ 16.210575][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.210885][ T12] page dumped because: kasan: bad access detected
[ 16.211095][ T12]
[ 16.211191][ T12] Memory state around the buggy address:
[ 16.211358][ T12] ffff888007c84580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.211591][ T12] ffff888007c84600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.211825][ T12] >ffff888007c84680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.212073][ T12] ^
[ 16.212278][ T12] ffff888007c84700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.212585][ T12] ffff888007c84780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.212824][ T12] ==================================================================
[ 16.213274][ T12] Disabling lock debugging due to kernel taint
[ 16.213513][ T12] ------------[ cut here ]------------
[ 16.213672][ T12] refcount_t: underflow; use-after-free.
[ 16.214338][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.214697][ T12] Modules linked in: veth
[ 16.214847][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.215281][ T12] Tainted: [B]=BAD_PAGE
[ 16.215404][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.215612][ T12] Workqueue: netns cleanup_net
[ 16.215792][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.216000][ T12] 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 8a 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
[ 16.216586][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.216832][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.217074][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.217374][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff157e134
[ 16.217618][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.217879][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.218140][ T12] FS: 0000000000000000(0000) GS:ffff8880aa290000(0000) knlGS:0000000000000000
[ 16.218431][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.218639][ T12] CR2: 000055dfeaf733b8 CR3: 0000000009f14006 CR4: 0000000000772ef0
[ 16.218897][ T12] PKRU: 55555554
[ 16.219029][ T12] Call Trace:
[ 16.219160][ T12]
[ 16.219259][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.219465][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.219645][ T12] ? generic_xdp_install+0x410/0x410
[ 16.219814][ T12] ops_undo_list+0x714/0x890
[ 16.219972][ T12] ? netns_get+0x110/0x110
[ 16.220145][ T12] ? cleanup_net+0x2d6/0x830
[ 16.220333][ T12] cleanup_net+0x3b2/0x830
[ 16.220497][ T12] ? net_passive_dec+0x190/0x190
[ 16.220660][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.220843][ T12] process_one_work+0xe35/0x1650
[ 16.221021][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.221215][ T12] ? assign_work+0x168/0x240
[ 16.221414][ T12] worker_thread+0x591/0xcf0
[ 16.221574][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.221756][ T12] kthread+0x37b/0x5f0
[ 16.221884][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.222044][ T12] ? ret_from_fork+0x1b/0x270
[ 16.222239][ T12] ? __lock_release+0x5d/0x170
[ 16.222448][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.222620][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.222810][ T12] ret_from_fork+0x1db/0x270
[ 16.222989][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.223184][ T12] ret_from_fork_asm+0x11/0x20
[ 16.223354][ T12]
[ 16.223488][ T12] irq event stamp: 2657
[ 16.223608][ T12] hardirqs last enabled at (2657): [] finish_task_switch.isra.0+0x245/0x960
[ 16.223970][ T12] hardirqs last disabled at (2656): [] __schedule+0x94a/0x1b10
[ 16.224297][ T12] softirqs last enabled at (2384): [] handle_softirqs+0x352/0x610
[ 16.224639][ T12] softirqs last disabled at (2379): [] irq_exit_rcu+0xab/0x100
[ 16.224920][ T12] ---[ end trace 0000000000000000 ]---