[ 21.629884][ T69] ==================================================================
[ 21.630183][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 21.630486][ T69] Read of size 1 at addr ffff888009c916c4 by task kworker/u16:1/69
[ 21.630737][ T69]
[ 21.630825][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.630830][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.630834][ T69] Workqueue: netns cleanup_net
[ 21.630844][ T69] Call Trace:
[ 21.630847][ T69]
[ 21.630850][ T69] dump_stack_lvl+0x82/0xc0
[ 21.630857][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 21.630865][ T69] ? kobject_put+0xbb/0xd0
[ 21.630869][ T69] print_report+0xb4/0x270
[ 21.630873][ T69] ? kobject_put+0xbb/0xd0
[ 21.630876][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 21.630880][ T69] ? kobject_put+0xbb/0xd0
[ 21.630883][ T69] kasan_report+0xca/0x100
[ 21.630887][ T69] ? kobject_put+0xbb/0xd0
[ 21.630892][ T69] kobject_put+0xbb/0xd0
[ 21.630896][ T69] netdev_run_todo+0x5f0/0xc60
[ 21.630902][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 21.630906][ T69] ? generic_xdp_install+0x410/0x410
[ 21.630909][ T69] ? net_generic+0xb1/0x1f0
[ 21.630918][ T69] ops_undo_list+0x714/0x890
[ 21.630924][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.630927][ T69] ? cleanup_net+0x2d6/0x8b0
[ 21.630933][ T69] cleanup_net+0x3b2/0x8b0
[ 21.630937][ T69] ? net_passive_dec+0x190/0x190
[ 21.630942][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.630951][ T69] process_one_work+0xe35/0x1650
[ 21.630961][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.630967][ T69] ? assign_work+0x168/0x240
[ 21.630972][ T69] worker_thread+0x591/0xcf0
[ 21.630977][ T69] ? rescuer_thread+0xd10/0xd10
[ 21.630981][ T69] kthread+0x37b/0x5f0
[ 21.630986][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.630988][ T69] ? ret_from_fork+0x1b/0x270
[ 21.630994][ T69] ? __lock_release+0x5d/0x170
[ 21.630998][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.631002][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.631008][ T69] ret_from_fork+0x1db/0x270
[ 21.631012][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.631018][ T69] ret_from_fork_asm+0x11/0x20
[ 21.631032][ T69]
[ 21.631034][ T69]
[ 21.637853][ T69] Allocated by task 256:
[ 21.637974][ T69] kasan_save_stack+0x24/0x40
[ 21.638152][ T69] kasan_save_track+0x14/0x30
[ 21.638315][ T69] __kasan_kmalloc+0x7b/0x90
[ 21.638481][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 21.638646][ T69] alloc_netdev_mqs+0x7d/0x1370
[ 21.638813][ T69] ip6_tnl_init_net+0x102/0x3f0
[ 21.638981][ T69] ops_init+0x189/0x550
[ 21.639106][ T69] setup_net+0xf1/0x380
[ 21.639235][ T69] copy_net_ns+0x253/0x510
[ 21.639397][ T69] create_new_namespaces+0x35f/0x900
[ 21.639565][ T69] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 21.639740][ T69] ksys_unshare+0x2be/0x6e0
[ 21.639915][ T69] __x64_sys_unshare+0x31/0x40
[ 21.640076][ T69] do_syscall_64+0xc1/0xfd0
[ 21.640248][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.640458][ T69]
[ 21.640544][ T69] Freed by task 69:
[ 21.640665][ T69] kasan_save_stack+0x24/0x40
[ 21.640840][ T69] kasan_save_track+0x14/0x30
[ 21.641002][ T69] __kasan_save_free_info+0x3b/0x60
[ 21.641169][ T69] __kasan_slab_free+0x3f/0x60
[ 21.641330][ T69] kfree+0x21d/0x540
[ 21.641456][ T69] device_release+0x9c/0x210
[ 21.641625][ T69] kobject_cleanup+0xfe/0x360
[ 21.641797][ T69] netdev_run_todo+0x81f/0xc60
[ 21.641963][ T69] ops_undo_list+0x714/0x890
[ 21.642132][ T69] cleanup_net+0x3b2/0x8b0
[ 21.642299][ T69] process_one_work+0xe35/0x1650
[ 21.642469][ T69] worker_thread+0x591/0xcf0
[ 21.642631][ T69] kthread+0x37b/0x5f0
[ 21.642765][ T69] ret_from_fork+0x1db/0x270
[ 21.642931][ T69] ret_from_fork_asm+0x11/0x20
[ 21.643093][ T69]
[ 21.643182][ T69] The buggy address belongs to the object at ffff888009c91000
[ 21.643182][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 21.643578][ T69] The buggy address is located 1732 bytes inside of
[ 21.643578][ T69] freed 4096-byte region [ffff888009c91000, ffff888009c92000)
[ 21.643974][ T69]
[ 21.644057][ T69] The buggy address belongs to the physical page:
[ 21.644261][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9c90
[ 21.644550][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 21.644799][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 21.645001][ T69] page_type: f5(slab)
[ 21.645141][ T69] raw: 0080000000000040 ffff888001043700 ffffea0000221010 ffffea0000249010
[ 21.645435][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.645726][ T69] head: 0080000000000040 ffff888001043700 ffffea0000221010 ffffea0000249010
[ 21.646020][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.646302][ T69] head: 0080000000000003 ffffea0000272401 00000000ffffffff 00000000ffffffff
[ 21.646602][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.646896][ T69] page dumped because: kasan: bad access detected
[ 21.647094][ T69]
[ 21.647174][ T69] Memory state around the buggy address:
[ 21.647327][ T69] ffff888009c91580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.647565][ T69] ffff888009c91600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.647805][ T69] >ffff888009c91680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.648041][ T69] ^
[ 21.648239][ T69] ffff888009c91700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.648477][ T69] ffff888009c91780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.648710][ T69] ==================================================================
[ 21.649497][ T69] Disabling lock debugging due to kernel taint
[ 21.649741][ T69] ------------[ cut here ]------------
[ 21.649894][ T69] refcount_t: underflow; use-after-free.
[ 21.650081][ T69] WARNING: CPU: 3 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.650388][ T69] Modules linked in: unix_diag
[ 21.650583][ T69] CPU: 3 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.650947][ T69] Tainted: [B]=BAD_PAGE
[ 21.651073][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.651301][ T69] Workqueue: netns cleanup_net
[ 21.651499][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.651722][ T69] 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 65 95 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
[ 21.652353][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 21.652583][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.652826][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.653074][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2cc0934
[ 21.653329][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 21.653584][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.653828][ T69] FS: 0000000000000000(0000) GS:ffff8880d5688000(0000) knlGS:0000000000000000
[ 21.654103][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.654331][ T69] CR2: 00007fd998628920 CR3: 0000000010882005 CR4: 0000000000772ef0
[ 21.654599][ T69] PKRU: 55555554
[ 21.654723][ T69] Call Trace:
[ 21.654849][ T69]
[ 21.654935][ T69] netdev_run_todo+0x5f0/0xc60
[ 21.655118][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 21.655298][ T69] ? generic_xdp_install+0x410/0x410
[ 21.655474][ T69] ? net_generic+0xb1/0x1f0
[ 21.655656][ T69] ops_undo_list+0x714/0x890
[ 21.655820][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.655977][ T69] ? cleanup_net+0x2d6/0x8b0
[ 21.656146][ T69] cleanup_net+0x3b2/0x8b0
[ 21.656310][ T69] ? net_passive_dec+0x190/0x190
[ 21.656520][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.656700][ T69] process_one_work+0xe35/0x1650
[ 21.656861][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.657037][ T69] ? assign_work+0x168/0x240
[ 21.657219][ T69] worker_thread+0x591/0xcf0
[ 21.657383][ T69] ? rescuer_thread+0xd10/0xd10
[ 21.657564][ T69] kthread+0x37b/0x5f0
[ 21.657694][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.657858][ T69] ? ret_from_fork+0x1b/0x270
[ 21.658014][ T69] ? __lock_release+0x5d/0x170
[ 21.658194][ T69] ? rcu_is_watching+0x12/0xb0
[ 21.658362][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.658569][ T69] ret_from_fork+0x1db/0x270
[ 21.658735][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.658893][ T69] ret_from_fork_asm+0x11/0x20
[ 21.659052][ T69]
[ 21.659182][ T69] irq event stamp: 10069
[ 21.659303][ T69] hardirqs last enabled at (10069): [] finish_task_switch.isra.0+0x245/0x960
[ 21.659639][ T69] hardirqs last disabled at (10068): [] __schedule+0x94a/0x1b10
[ 21.659922][ T69] softirqs last enabled at (9710): [] handle_softirqs+0x352/0x610
[ 21.660202][ T69] softirqs last disabled at (9703): [] irq_exit_rcu+0xab/0x100
[ 21.660496][ T69] ---[ end trace 0000000000000000 ]---
[ 82.587622][ T497] ip (497) used greatest stack depth: 23464 bytes left