[ 16.626018][ T12] ==================================================================
[ 16.626482][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.626786][ T12] Read of size 1 at addr ffff88800510c694 by task kworker/u16:0/12
[ 16.627171][ T12]
[ 16.627292][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.627298][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.627301][ T12] Workqueue: netns cleanup_net
[ 16.627310][ T12] Call Trace:
[ 16.627312][ T12]
[ 16.627316][ T12] dump_stack_lvl+0x82/0xc0
[ 16.627323][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.627332][ T12] ? kobject_put+0xbb/0xd0
[ 16.627337][ T12] print_report+0xb4/0x270
[ 16.627340][ T12] ? kobject_put+0xbb/0xd0
[ 16.627343][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.627347][ T12] ? kobject_put+0xbb/0xd0
[ 16.627350][ T12] kasan_report+0xca/0x100
[ 16.627354][ T12] ? kobject_put+0xbb/0xd0
[ 16.627360][ T12] kobject_put+0xbb/0xd0
[ 16.627363][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.627369][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.627373][ T12] ? generic_xdp_install+0x410/0x410
[ 16.627379][ T12] ops_undo_list+0x714/0x890
[ 16.627383][ T12] ? netns_get+0x110/0x110
[ 16.627385][ T12] ? cleanup_net+0x2d6/0x830
[ 16.627390][ T12] cleanup_net+0x3b2/0x830
[ 16.627394][ T12] ? net_passive_dec+0x190/0x190
[ 16.627397][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.627404][ T12] process_one_work+0xe35/0x1650
[ 16.627411][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.627416][ T12] ? assign_work+0x168/0x240
[ 16.627420][ T12] worker_thread+0x591/0xcf0
[ 16.627425][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.627428][ T12] kthread+0x37b/0x5f0
[ 16.627432][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.627434][ T12] ? ret_from_fork+0x1b/0x270
[ 16.627440][ T12] ? __lock_release+0x5d/0x170
[ 16.627447][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.627449][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.627452][ T12] ret_from_fork+0x1db/0x270
[ 16.627455][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.627458][ T12] ret_from_fork_asm+0x11/0x20
[ 16.627467][ T12]
[ 16.627468][ T12]
[ 16.635288][ T12] Allocated by task 231:
[ 16.635441][ T12] kasan_save_stack+0x24/0x40
[ 16.635641][ T12] kasan_save_track+0x14/0x30
[ 16.635847][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.636041][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.636233][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.636456][ T12] sit_init_net+0x169/0x550
[ 16.636668][ T12] ops_init+0x189/0x550
[ 16.636819][ T12] setup_net+0xf1/0x380
[ 16.636973][ T12] copy_net_ns+0x21a/0x380
[ 16.637172][ T12] create_new_namespaces+0x35f/0x900
[ 16.637378][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.637568][ T12] ksys_unshare+0x2a3/0x660
[ 16.637763][ T12] __x64_sys_unshare+0x31/0x40
[ 16.637970][ T12] do_syscall_64+0xc1/0xfd0
[ 16.638171][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.638431][ T12]
[ 16.638529][ T12] Freed by task 12:
[ 16.638691][ T12] kasan_save_stack+0x24/0x40
[ 16.638901][ T12] kasan_save_track+0x14/0x30
[ 16.639091][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.639300][ T12] __kasan_slab_free+0x3f/0x60
[ 16.639520][ T12] kfree+0x21d/0x540
[ 16.639672][ T12] device_release+0x9c/0x210
[ 16.639880][ T12] kobject_cleanup+0xfe/0x360
[ 16.640077][ T12] netdev_run_todo+0x81f/0xc60
[ 16.640278][ T12] ops_undo_list+0x714/0x890
[ 16.640470][ T12] cleanup_net+0x3b2/0x830
[ 16.640673][ T12] process_one_work+0xe35/0x1650
[ 16.640875][ T12] worker_thread+0x591/0xcf0
[ 16.641061][ T12] kthread+0x37b/0x5f0
[ 16.641314][ T12] ret_from_fork+0x1db/0x270
[ 16.641528][ T12] ret_from_fork_asm+0x11/0x20
[ 16.641723][ T12]
[ 16.641821][ T12] The buggy address belongs to the object at ffff88800510c000
[ 16.641821][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.642352][ T12] The buggy address is located 1684 bytes inside of
[ 16.642352][ T12] freed 4096-byte region [ffff88800510c000, ffff88800510d000)
[ 16.642855][ T12]
[ 16.642958][ T12] The buggy address belongs to the physical page:
[ 16.643202][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5108
[ 16.643553][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.643958][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.644220][ T12] page_type: f5(slab)
[ 16.644370][ T12] raw: 0080000000000040 ffff888001043700 ffffea000007a410 ffffea0000243610
[ 16.644821][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.645165][ T12] head: 0080000000000040 ffff888001043700 ffffea000007a410 ffffea0000243610
[ 16.645615][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.645982][ T12] head: 0080000000000003 ffffea0000144201 00000000ffffffff 00000000ffffffff
[ 16.646324][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.646763][ T12] page dumped because: kasan: bad access detected
[ 16.647009][ T12]
[ 16.647106][ T12] Memory state around the buggy address:
[ 16.647389][ T12] ffff88800510c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.647692][ T12] ffff88800510c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.647986][ T12] >ffff88800510c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.648297][ T12] ^
[ 16.648477][ T12] ffff88800510c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.648887][ T12] ffff88800510c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.649192][ T12] ==================================================================
[ 16.649579][ T12] Disabling lock debugging due to kernel taint
[ 16.649982][ T12] ------------[ cut here ]------------
[ 16.650249][ T12] refcount_t: underflow; use-after-free.
[ 16.650598][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.651082][ T12] Modules linked in: veth
[ 16.651320][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.651984][ T12] Tainted: [B]=BAD_PAGE
[ 16.652393][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.652785][ T12] Workqueue: netns cleanup_net
[ 16.653106][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.653499][ 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 05 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
[ 16.654519][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.654907][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.655336][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.655773][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff353e134
[ 16.656173][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.656620][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.657203][ T12] FS: 0000000000000000(0000) GS:ffff888094910000(0000) knlGS:0000000000000000
[ 16.657873][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.658250][ T12] CR2: 00007f0b9937fdb0 CR3: 0000000004db0005 CR4: 0000000000772ef0
[ 16.658701][ T12] PKRU: 55555554
[ 16.658930][ T12] Call Trace:
[ 16.659156][ T12]
[ 16.659318][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.659631][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.659927][ T12] ? generic_xdp_install+0x410/0x410
[ 16.660382][ T12] ops_undo_list+0x714/0x890
[ 16.660687][ T12] ? netns_get+0x110/0x110
[ 16.660975][ T12] ? cleanup_net+0x2d6/0x830
[ 16.661271][ T12] cleanup_net+0x3b2/0x830
[ 16.661728][ T12] ? net_passive_dec+0x190/0x190
[ 16.662017][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.662314][ T12] process_one_work+0xe35/0x1650
[ 16.662628][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.662927][ T12] ? assign_work+0x168/0x240
[ 16.663223][ T12] worker_thread+0x591/0xcf0
[ 16.663536][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.663835][ T12] kthread+0x37b/0x5f0
[ 16.664067][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.664360][ T12] ? ret_from_fork+0x1b/0x270
[ 16.664666][ T12] ? __lock_release+0x5d/0x170
[ 16.664965][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.665458][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.665766][ T12] ret_from_fork+0x1db/0x270
[ 16.666060][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.666364][ T12] ret_from_fork_asm+0x11/0x20
[ 16.666680][ T12]
[ 16.667073][ T12] irq event stamp: 2961
[ 16.667304][ T12] hardirqs last enabled at (2961): [] finish_task_switch.isra.0+0x245/0x960
[ 16.667873][ T12] hardirqs last disabled at (2960): [] __schedule+0x94a/0x1b10
[ 16.668559][ T12] softirqs last enabled at (2872): [] handle_softirqs+0x352/0x610
[ 16.669061][ T12] softirqs last disabled at (2573): [] irq_exit_rcu+0xab/0x100
[ 16.669566][ T12] ---[ end trace 0000000000000000 ]---
[ 17.352540][ T231] self-connect_ip (231) used greatest stack depth: 24432 bytes left