[ 16.230816][ T69] ==================================================================
[ 16.231130][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.231416][ T69] Read of size 1 at addr ffff888001fdc694 by task kworker/u16:1/69
[ 16.231688][ T69]
[ 16.231784][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.231790][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.231793][ T69] Workqueue: netns cleanup_net
[ 16.231803][ T69] Call Trace:
[ 16.231805][ T69]
[ 16.231808][ T69] dump_stack_lvl+0x82/0xc0
[ 16.231814][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 16.231828][ T69] ? kobject_put+0xbb/0xd0
[ 16.231832][ T69] print_report+0xb4/0x270
[ 16.231836][ T69] ? kobject_put+0xbb/0xd0
[ 16.231839][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 16.231843][ T69] ? kobject_put+0xbb/0xd0
[ 16.231845][ T69] kasan_report+0xca/0x100
[ 16.231849][ T69] ? kobject_put+0xbb/0xd0
[ 16.231854][ T69] kobject_put+0xbb/0xd0
[ 16.231857][ T69] netdev_run_todo+0x5f0/0xc60
[ 16.231863][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 16.231867][ T69] ? generic_xdp_install+0x410/0x410
[ 16.231874][ T69] ops_undo_list+0x714/0x890
[ 16.231878][ T69] ? netns_get+0x110/0x110
[ 16.231880][ T69] ? cleanup_net+0x2d6/0x830
[ 16.231885][ T69] cleanup_net+0x3b2/0x830
[ 16.231888][ T69] ? net_passive_dec+0x190/0x190
[ 16.231892][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.231897][ T69] process_one_work+0xe35/0x1650
[ 16.231907][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.231912][ T69] ? assign_work+0x168/0x240
[ 16.231915][ T69] worker_thread+0x591/0xcf0
[ 16.231920][ T69] ? rescuer_thread+0xd10/0xd10
[ 16.231923][ T69] kthread+0x37b/0x5f0
[ 16.231927][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.231929][ T69] ? ret_from_fork+0x1b/0x270
[ 16.231937][ T69] ? __lock_release+0x5d/0x170
[ 16.231944][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.231947][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.231950][ T69] ret_from_fork+0x1db/0x270
[ 16.231953][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.231955][ T69] ret_from_fork_asm+0x11/0x20
[ 16.231965][ T69]
[ 16.231966][ T69]
[ 16.238754][ T69] Allocated by task 229:
[ 16.238891][ T69] kasan_save_stack+0x24/0x40
[ 16.239079][ T69] kasan_save_track+0x14/0x30
[ 16.239341][ T69] __kasan_kmalloc+0x7b/0x90
[ 16.239502][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.239681][ T69] alloc_netdev_mqs+0x7d/0x1310
[ 16.239856][ T69] sit_init_net+0x169/0x550
[ 16.240122][ T69] ops_init+0x189/0x550
[ 16.240276][ T69] setup_net+0xf1/0x380
[ 16.240402][ T69] copy_net_ns+0x21a/0x380
[ 16.240566][ T69] create_new_namespaces+0x35f/0x900
[ 16.240852][ T69] unshare_nsproxy_namespaces+0x89/0x120
[ 16.241037][ T69] ksys_unshare+0x2a3/0x660
[ 16.241219][ T69] __x64_sys_unshare+0x31/0x40
[ 16.241387][ T69] do_syscall_64+0xc1/0xfd0
[ 16.241660][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.241915][ T69]
[ 16.242008][ T69] Freed by task 69:
[ 16.242129][ T69] kasan_save_stack+0x24/0x40
[ 16.242295][ T69] kasan_save_track+0x14/0x30
[ 16.242543][ T69] __kasan_save_free_info+0x3b/0x60
[ 16.242737][ T69] __kasan_slab_free+0x3f/0x60
[ 16.242902][ T69] kfree+0x21d/0x540
[ 16.243037][ T69] device_release+0x9c/0x210
[ 16.243300][ T69] kobject_cleanup+0xfe/0x360
[ 16.243462][ T69] netdev_run_todo+0x81f/0xc60
[ 16.243649][ T69] ops_undo_list+0x714/0x890
[ 16.243820][ T69] cleanup_net+0x3b2/0x830
[ 16.244091][ T69] process_one_work+0xe35/0x1650
[ 16.244282][ T69] worker_thread+0x591/0xcf0
[ 16.244447][ T69] kthread+0x37b/0x5f0
[ 16.244574][ T69] ret_from_fork+0x1db/0x270
[ 16.244794][ T69] ret_from_fork_asm+0x11/0x20
[ 16.244963][ T69]
[ 16.245060][ T69] The buggy address belongs to the object at ffff888001fdc000
[ 16.245060][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 16.245554][ T69] The buggy address is located 1684 bytes inside of
[ 16.245554][ T69] freed 4096-byte region [ffff888001fdc000, ffff888001fdd000)
[ 16.246006][ T69]
[ 16.246128][ T69] The buggy address belongs to the physical page:
[ 16.246436][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fd8
[ 16.246748][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.247012][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.247239][ T69] page_type: f5(slab)
[ 16.247378][ T69] raw: 0080000000000040 ffff888001043700 ffffea00001bb810 ffffea0000251210
[ 16.247710][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.248140][ T69] head: 0080000000000040 ffff888001043700 ffffea00001bb810 ffffea0000251210
[ 16.248445][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.248887][ T69] head: 0080000000000003 ffffea000007f601 00000000ffffffff 00000000ffffffff
[ 16.249208][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.249516][ T69] page dumped because: kasan: bad access detected
[ 16.249737][ T69]
[ 16.249827][ T69] Memory state around the buggy address:
[ 16.249998][ T69] ffff888001fdc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.250261][ T69] ffff888001fdc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.250510][ T69] >ffff888001fdc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.250819][ T69] ^
[ 16.251121][ T69] ffff888001fdc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.251387][ T69] ffff888001fdc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.251653][ T69] ==================================================================
[ 16.251920][ T69] Disabling lock debugging due to kernel taint
[ 16.252147][ T69] ------------[ cut here ]------------
[ 16.252303][ T69] refcount_t: underflow; use-after-free.
[ 16.252655][ T69] WARNING: CPU: 0 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.252992][ T69] Modules linked in: veth
[ 16.253137][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.253816][ T69] Tainted: [B]=BAD_PAGE
[ 16.254016][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.254291][ T69] Workqueue: netns cleanup_net
[ 16.254559][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.255049][ T69] 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 45 9e 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
[ 16.256276][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 16.256607][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.257010][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.257577][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3dbe134
[ 16.257989][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 16.258384][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.258968][ T69] FS: 0000000000000000(0000) GS:ffff888096010000(0000) knlGS:0000000000000000
[ 16.259424][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.259906][ T69] CR2: 00007f09633d2100 CR3: 000000000ffc6006 CR4: 0000000000772ef0
[ 16.260312][ T69] PKRU: 55555554
[ 16.260510][ T69] Call Trace:
[ 16.260710][ T69]
[ 16.261089][ T69] netdev_run_todo+0x5f0/0xc60
[ 16.261361][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 16.261628][ T69] ? generic_xdp_install+0x410/0x410
[ 16.261910][ T69] ops_undo_list+0x714/0x890
[ 16.262176][ T69] ? netns_get+0x110/0x110
[ 16.262601][ T69] ? cleanup_net+0x2d6/0x830
[ 16.262864][ T69] cleanup_net+0x3b2/0x830
[ 16.263095][ T69] ? net_passive_dec+0x190/0x190
[ 16.263264][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.263636][ T69] process_one_work+0xe35/0x1650
[ 16.263849][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.264016][ T69] ? assign_work+0x168/0x240
[ 16.264178][ T69] worker_thread+0x591/0xcf0
[ 16.264430][ T69] ? rescuer_thread+0xd10/0xd10
[ 16.264607][ T69] kthread+0x37b/0x5f0
[ 16.264733][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.264910][ T69] ? ret_from_fork+0x1b/0x270
[ 16.265075][ T69] ? __lock_release+0x5d/0x170
[ 16.265237][ T69] ? rcu_is_watching+0x12/0xb0
[ 16.265401][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.265573][ T69] ret_from_fork+0x1db/0x270
[ 16.265828][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.265989][ T69] ret_from_fork_asm+0x11/0x20
[ 16.266153][ T69]
[ 16.266297][ T69] irq event stamp: 2595
[ 16.266522][ T69] hardirqs last enabled at (2595): [] irqentry_exit+0x3b/0x80
[ 16.266823][ T69] hardirqs last disabled at (2594): [] handle_softirqs+0x47f/0x610
[ 16.267110][ T69] softirqs last enabled at (2038): [] handle_softirqs+0x352/0x610
[ 16.267574][ T69] softirqs last disabled at (2031): [] irq_exit_rcu+0xab/0x100
[ 16.267870][ T69] ---[ end trace 0000000000000000 ]---