[ 16.558016][ T12] ==================================================================
[ 16.558422][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.558725][ T12] Read of size 1 at addr ffff8880088c9694 by task kworker/u16:0/12
[ 16.559064][ T12]
[ 16.559228][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.559235][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.559240][ T12] Workqueue: netns cleanup_net
[ 16.559251][ T12] Call Trace:
[ 16.559253][ T12]
[ 16.559257][ T12] dump_stack_lvl+0x82/0xc0
[ 16.559266][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.559276][ T12] ? kobject_put+0xbb/0xd0
[ 16.559281][ T12] print_report+0xb4/0x270
[ 16.559285][ T12] ? kobject_put+0xbb/0xd0
[ 16.559289][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.559294][ T12] ? kobject_put+0xbb/0xd0
[ 16.559297][ T12] kasan_report+0xca/0x100
[ 16.559303][ T12] ? kobject_put+0xbb/0xd0
[ 16.559310][ T12] kobject_put+0xbb/0xd0
[ 16.559314][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.559323][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.559328][ T12] ? generic_xdp_install+0x410/0x410
[ 16.559339][ T12] ops_undo_list+0x714/0x890
[ 16.559347][ T12] ? netns_get+0x110/0x110
[ 16.559351][ T12] ? cleanup_net+0x2d6/0x830
[ 16.559359][ T12] cleanup_net+0x3b2/0x830
[ 16.559365][ T12] ? net_passive_dec+0x190/0x190
[ 16.559372][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.559382][ T12] process_one_work+0xe35/0x1650
[ 16.559396][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.559406][ T12] ? assign_work+0x168/0x240
[ 16.559412][ T12] worker_thread+0x591/0xcf0
[ 16.559419][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.559424][ T12] kthread+0x37b/0x5f0
[ 16.559431][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.559434][ T12] ? ret_from_fork+0x1b/0x270
[ 16.559443][ T12] ? __lock_release+0x5d/0x170
[ 16.559452][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.559456][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.559461][ T12] ret_from_fork+0x1db/0x270
[ 16.559465][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.559469][ T12] ret_from_fork_asm+0x11/0x20
[ 16.559483][ T12]
[ 16.559485][ T12]
[ 16.567875][ T12] Allocated by task 229:
[ 16.568042][ T12] kasan_save_stack+0x24/0x40
[ 16.568324][ T12] kasan_save_track+0x14/0x30
[ 16.568508][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.568770][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.568951][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.569143][ T12] sit_init_net+0x169/0x550
[ 16.569343][ T12] ops_init+0x189/0x550
[ 16.569480][ T12] setup_net+0xf1/0x380
[ 16.569660][ T12] copy_net_ns+0x21a/0x380
[ 16.569875][ T12] create_new_namespaces+0x35f/0x900
[ 16.570072][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.570316][ T12] ksys_unshare+0x2a3/0x660
[ 16.570506][ T12] __x64_sys_unshare+0x31/0x40
[ 16.570681][ T12] do_syscall_64+0xc1/0xfd0
[ 16.570855][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.571131][ T12]
[ 16.571264][ T12] Freed by task 12:
[ 16.571409][ T12] kasan_save_stack+0x24/0x40
[ 16.571621][ T12] kasan_save_track+0x14/0x30
[ 16.571815][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.572007][ T12] __kasan_slab_free+0x3f/0x60
[ 16.572266][ T12] kfree+0x21d/0x540
[ 16.572410][ T12] device_release+0x9c/0x210
[ 16.572693][ T12] kobject_cleanup+0xfe/0x360
[ 16.572995][ T12] netdev_run_todo+0x81f/0xc60
[ 16.573242][ T12] ops_undo_list+0x714/0x890
[ 16.573532][ T12] cleanup_net+0x3b2/0x830
[ 16.573833][ T12] process_one_work+0xe35/0x1650
[ 16.574151][ T12] worker_thread+0x591/0xcf0
[ 16.574435][ T12] kthread+0x37b/0x5f0
[ 16.574682][ T12] ret_from_fork+0x1db/0x270
[ 16.575009][ T12] ret_from_fork_asm+0x11/0x20
[ 16.575336][ T12]
[ 16.575481][ T12] The buggy address belongs to the object at ffff8880088c9000
[ 16.575481][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.576185][ T12] The buggy address is located 1684 bytes inside of
[ 16.576185][ T12] freed 4096-byte region [ffff8880088c9000, ffff8880088ca000)
[ 16.576906][ T12]
[ 16.577052][ T12] The buggy address belongs to the physical page:
[ 16.577413][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x88c8
[ 16.577956][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.578404][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.578753][ T12] page_type: f5(slab)
[ 16.578965][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001b9210 ffffea0000241410
[ 16.579476][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.579972][ T12] head: 0080000000000040 ffff888001043700 ffffea00001b9210 ffffea0000241410
[ 16.580502][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.581018][ T12] head: 0080000000000003 ffffea0000223201 00000000ffffffff 00000000ffffffff
[ 16.581498][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.581996][ T12] page dumped because: kasan: bad access detected
[ 16.582320][ T12]
[ 16.582460][ T12] Memory state around the buggy address:
[ 16.582726][ T12] ffff8880088c9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.583144][ T12] ffff8880088c9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.583540][ T12] >ffff8880088c9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.583877][ T12] ^
[ 16.584054][ T12] ffff8880088c9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.584334][ T12] ffff8880088c9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.584572][ T12] ==================================================================
[ 16.585041][ T12] Disabling lock debugging due to kernel taint
[ 16.585334][ T12] ------------[ cut here ]------------
[ 16.585511][ T12] refcount_t: underflow; use-after-free.
[ 16.585700][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.586019][ T12] Modules linked in: veth
[ 16.586171][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.586563][ T12] Tainted: [B]=BAD_PAGE
[ 16.586728][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.586951][ T12] Workqueue: netns cleanup_net
[ 16.587146][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.587385][ 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 e5 aa 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
[ 16.588010][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.588268][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.588532][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.588789][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff56fe134
[ 16.589049][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.589352][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.589728][ T12] FS: 0000000000000000(0000) GS:ffff888083d90000(0000) knlGS:0000000000000000
[ 16.590208][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.590578][ T12] CR2: 00007f03e41d2b40 CR3: 000000000a65e001 CR4: 0000000000772ef0
[ 16.591006][ T12] PKRU: 55555554
[ 16.591237][ T12] Call Trace:
[ 16.591456][ T12]
[ 16.591611][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.591903][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.592192][ T12] ? generic_xdp_install+0x410/0x410
[ 16.592477][ T12] ops_undo_list+0x714/0x890
[ 16.592750][ T12] ? netns_get+0x110/0x110
[ 16.593027][ T12] ? cleanup_net+0x2d6/0x830
[ 16.593312][ T12] cleanup_net+0x3b2/0x830
[ 16.593591][ T12] ? net_passive_dec+0x190/0x190
[ 16.593880][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.594146][ T12] process_one_work+0xe35/0x1650
[ 16.594597][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.594884][ T12] ? assign_work+0x168/0x240
[ 16.595076][ T12] worker_thread+0x591/0xcf0
[ 16.595350][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.595788][ T12] kthread+0x37b/0x5f0
[ 16.595958][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.596154][ T12] ? ret_from_fork+0x1b/0x270
[ 16.596367][ T12] ? __lock_release+0x5d/0x170
[ 16.596546][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.596772][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.596969][ T12] ret_from_fork+0x1db/0x270
[ 16.597154][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.597446][ T12] ret_from_fork_asm+0x11/0x20
[ 16.597659][ T12]
[ 16.597853][ T12] irq event stamp: 2641
[ 16.598126][ T12] hardirqs last enabled at (2641): [] finish_task_switch.isra.0+0x245/0x960
[ 16.598655][ T12] hardirqs last disabled at (2640): [] __schedule+0x94a/0x1b10
[ 16.599015][ T12] softirqs last enabled at (2350): [] handle_softirqs+0x352/0x610
[ 16.599504][ T12] softirqs last disabled at (2343): [] irq_exit_rcu+0xab/0x100
[ 16.599836][ T12] ---[ end trace 0000000000000000 ]---
[ 18.161292][ T229] restore_ipv4 (229) used greatest stack depth: 24256 bytes left