[ 15.683984][ T12] ==================================================================
[ 15.684297][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.684545][ T12] Read of size 1 at addr ffff8880091e16c4 by task kworker/u16:0/12
[ 15.684777][ T12]
[ 15.684860][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.684865][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.684868][ T12] Workqueue: netns cleanup_net
[ 15.684876][ T12] Call Trace:
[ 15.684878][ T12]
[ 15.684881][ T12] dump_stack_lvl+0x82/0xc0
[ 15.684886][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 15.684893][ T12] ? kobject_put+0xbb/0xd0
[ 15.684897][ T12] print_report+0xb4/0x270
[ 15.684900][ T12] ? kobject_put+0xbb/0xd0
[ 15.684903][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 15.684907][ T12] ? kobject_put+0xbb/0xd0
[ 15.684910][ T12] kasan_report+0xca/0x100
[ 15.684913][ T12] ? kobject_put+0xbb/0xd0
[ 15.684919][ T12] kobject_put+0xbb/0xd0
[ 15.684922][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.684928][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.684932][ T12] ? generic_xdp_install+0x410/0x410
[ 15.684935][ T12] ? net_generic+0xb1/0x1f0
[ 15.684944][ T12] ops_undo_list+0x714/0x890
[ 15.684949][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 15.684952][ T12] ? cleanup_net+0x2d6/0x8b0
[ 15.684958][ T12] cleanup_net+0x3b2/0x8b0
[ 15.684962][ T12] ? net_passive_dec+0x190/0x190
[ 15.684967][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.684974][ T12] process_one_work+0xe35/0x1650
[ 15.684983][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.684988][ T12] ? assign_work+0x168/0x240
[ 15.684993][ T12] worker_thread+0x591/0xcf0
[ 15.684999][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.685002][ T12] kthread+0x37b/0x5f0
[ 15.685006][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.685009][ T12] ? ret_from_fork+0x1b/0x270
[ 15.685013][ T12] ? __lock_release+0x5d/0x170
[ 15.685020][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.685025][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.685030][ T12] ret_from_fork+0x1db/0x270
[ 15.685034][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.685039][ T12] ret_from_fork_asm+0x11/0x20
[ 15.685049][ T12]
[ 15.685050][ T12]
[ 15.691730][ T12] Allocated by task 255:
[ 15.691865][ T12] kasan_save_stack+0x24/0x40
[ 15.692059][ T12] kasan_save_track+0x14/0x30
[ 15.692237][ T12] __kasan_kmalloc+0x7b/0x90
[ 15.692404][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.692571][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 15.692730][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 15.692917][ T12] ops_init+0x189/0x550
[ 15.693044][ T12] setup_net+0xf1/0x380
[ 15.693163][ T12] copy_net_ns+0x253/0x510
[ 15.693334][ T12] create_new_namespaces+0x35f/0x900
[ 15.693488][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 15.693641][ T12] ksys_unshare+0x2be/0x6e0
[ 15.693799][ T12] __x64_sys_unshare+0x31/0x40
[ 15.693952][ T12] do_syscall_64+0xc1/0xfd0
[ 15.694118][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.694321][ T12]
[ 15.694400][ T12] Freed by task 12:
[ 15.694518][ T12] kasan_save_stack+0x24/0x40
[ 15.694674][ T12] kasan_save_track+0x14/0x30
[ 15.694836][ T12] __kasan_save_free_info+0x3b/0x60
[ 15.694991][ T12] __kasan_slab_free+0x3f/0x60
[ 15.695190][ T12] kfree+0x21d/0x540
[ 15.695308][ T12] device_release+0x9c/0x210
[ 15.695467][ T12] kobject_cleanup+0xfe/0x360
[ 15.695626][ T12] netdev_run_todo+0x81f/0xc60
[ 15.695794][ T12] ops_undo_list+0x714/0x890
[ 15.695952][ T12] cleanup_net+0x3b2/0x8b0
[ 15.696120][ T12] process_one_work+0xe35/0x1650
[ 15.696289][ T12] worker_thread+0x591/0xcf0
[ 15.696442][ T12] kthread+0x37b/0x5f0
[ 15.696558][ T12] ret_from_fork+0x1db/0x270
[ 15.696715][ T12] ret_from_fork_asm+0x11/0x20
[ 15.696879][ T12]
[ 15.696962][ T12] The buggy address belongs to the object at ffff8880091e1000
[ 15.696962][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 15.697358][ T12] The buggy address is located 1732 bytes inside of
[ 15.697358][ T12] freed 4096-byte region [ffff8880091e1000, ffff8880091e2000)
[ 15.697726][ T12]
[ 15.697817][ T12] The buggy address belongs to the physical page:
[ 15.698016][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x91e0
[ 15.698311][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.698542][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.698739][ T12] page_type: f5(slab)
[ 15.698868][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002b0210 ffffea0000207010
[ 15.699164][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.699455][ T12] head: 0080000000000040 ffff888001043700 ffffea00002b0210 ffffea0000207010
[ 15.699731][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.700023][ T12] head: 0080000000000003 ffffea0000247801 00000000ffffffff 00000000ffffffff
[ 15.700322][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.700597][ T12] page dumped because: kasan: bad access detected
[ 15.700795][ T12]
[ 15.700873][ T12] Memory state around the buggy address:
[ 15.701028][ T12] ffff8880091e1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.701264][ T12] ffff8880091e1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.701488][ T12] >ffff8880091e1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.701707][ T12] ^
[ 15.701900][ T12] ffff8880091e1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.702138][ T12] ffff8880091e1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.702371][ T12] ==================================================================
[ 15.702762][ T12] Disabling lock debugging due to kernel taint
[ 15.702993][ T12] ------------[ cut here ]------------
[ 15.703150][ T12] refcount_t: underflow; use-after-free.
[ 15.703327][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.704292][ T12] Modules linked in:
[ 15.704446][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.704820][ T12] Tainted: [B]=BAD_PAGE
[ 15.704938][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.705145][ T12] Workqueue: netns cleanup_net
[ 15.705309][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.705523][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 45 ad e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 15.706101][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 15.706313][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.706547][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.706779][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5c80934
[ 15.707074][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 15.707321][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.707564][ T12] FS: 0000000000000000(0000) GS:ffff8880bd788000(0000) knlGS:0000000000000000
[ 15.707848][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.708049][ T12] CR2: 00007f9bd22de760 CR3: 0000000063d49002 CR4: 0000000000772ef0
[ 15.708290][ T12] PKRU: 55555554
[ 15.708419][ T12] Call Trace:
[ 15.708534][ T12]
[ 15.708614][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.708773][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.708943][ T12] ? generic_xdp_install+0x410/0x410
[ 15.709110][ T12] ? net_generic+0xb1/0x1f0
[ 15.709285][ T12] ops_undo_list+0x714/0x890
[ 15.709451][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 15.709602][ T12] ? cleanup_net+0x2d6/0x8b0
[ 15.709754][ T12] cleanup_net+0x3b2/0x8b0
[ 15.709920][ T12] ? net_passive_dec+0x190/0x190
[ 15.710077][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.710247][ T12] process_one_work+0xe35/0x1650
[ 15.710421][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.710587][ T12] ? assign_work+0x168/0x240
[ 15.710746][ T12] worker_thread+0x591/0xcf0
[ 15.710908][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.711166][ T12] kthread+0x37b/0x5f0
[ 15.711293][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.711458][ T12] ? ret_from_fork+0x1b/0x270
[ 15.711611][ T12] ? __lock_release+0x5d/0x170
[ 15.711768][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.711927][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.712102][ T12] ret_from_fork+0x1db/0x270
[ 15.712274][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.712435][ T12] ret_from_fork_asm+0x11/0x20
[ 15.712591][ T12]
[ 15.712706][ T12] irq event stamp: 10259
[ 15.712837][ T12] hardirqs last enabled at (10259): [] finish_task_switch.isra.0+0x245/0x960
[ 15.713173][ T12] hardirqs last disabled at (10258): [] __schedule+0x94a/0x1b10
[ 15.713484][ T12] softirqs last enabled at (9936): [] handle_softirqs+0x352/0x610
[ 15.713741][ T12] softirqs last disabled at (9929): [] irq_exit_rcu+0xab/0x100
[ 15.714037][ T12] ---[ end trace 0000000000000000 ]---