[ 15.282757][ T12] ==================================================================
[ 15.283128][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.283451][ T12] Read of size 1 at addr ffff88800a341694 by task kworker/u16:0/12
[ 15.283733][ T12]
[ 15.283861][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.283866][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.283869][ T12] Workqueue: netns cleanup_net
[ 15.283876][ T12] Call Trace:
[ 15.283878][ T12]
[ 15.283881][ T12] dump_stack_lvl+0x82/0xc0
[ 15.283887][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 15.283894][ T12] ? kobject_put+0xbb/0xd0
[ 15.283898][ T12] print_report+0xb4/0x270
[ 15.283902][ T12] ? kobject_put+0xbb/0xd0
[ 15.283904][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 15.283908][ T12] ? kobject_put+0xbb/0xd0
[ 15.283911][ T12] kasan_report+0xca/0x100
[ 15.283915][ T12] ? kobject_put+0xbb/0xd0
[ 15.283920][ T12] kobject_put+0xbb/0xd0
[ 15.283923][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.283929][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.283933][ T12] ? generic_xdp_install+0x410/0x410
[ 15.283939][ T12] ops_undo_list+0x714/0x890
[ 15.283944][ T12] ? netns_get+0x110/0x110
[ 15.283946][ T12] ? cleanup_net+0x2d6/0x830
[ 15.283951][ T12] cleanup_net+0x3b2/0x830
[ 15.283954][ T12] ? net_passive_dec+0x190/0x190
[ 15.283957][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.283963][ T12] process_one_work+0xe35/0x1650
[ 15.283970][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.283975][ T12] ? assign_work+0x168/0x240
[ 15.283979][ T12] worker_thread+0x591/0xcf0
[ 15.283984][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.283987][ T12] kthread+0x37b/0x5f0
[ 15.283990][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.283992][ T12] ? ret_from_fork+0x1b/0x270
[ 15.283998][ T12] ? __lock_release+0x5d/0x170
[ 15.284003][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.284005][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.284008][ T12] ret_from_fork+0x1db/0x270
[ 15.284011][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.284014][ T12] ret_from_fork_asm+0x11/0x20
[ 15.284022][ T12]
[ 15.284023][ T12]
[ 15.291028][ T12] Allocated by task 229:
[ 15.291219][ T12] kasan_save_stack+0x24/0x40
[ 15.291388][ T12] kasan_save_track+0x14/0x30
[ 15.291544][ T12] __kasan_kmalloc+0x7b/0x90
[ 15.291704][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.291871][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 15.292146][ T12] sit_init_net+0x169/0x550
[ 15.292309][ T12] ops_init+0x189/0x550
[ 15.292429][ T12] setup_net+0xf1/0x380
[ 15.292554][ T12] copy_net_ns+0x21a/0x380
[ 15.292803][ T12] create_new_namespaces+0x35f/0x900
[ 15.292969][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 15.293146][ T12] ksys_unshare+0x2a3/0x660
[ 15.293309][ T12] __x64_sys_unshare+0x31/0x40
[ 15.293563][ T12] do_syscall_64+0xc1/0xfd0
[ 15.293723][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.293958][ T12]
[ 15.294039][ T12] Freed by task 12:
[ 15.294181][ T12] kasan_save_stack+0x24/0x40
[ 15.294370][ T12] kasan_save_track+0x14/0x30
[ 15.294531][ T12] __kasan_save_free_info+0x3b/0x60
[ 15.294701][ T12] __kasan_slab_free+0x3f/0x60
[ 15.294860][ T12] kfree+0x21d/0x540
[ 15.295086][ T12] device_release+0x9c/0x210
[ 15.295250][ T12] kobject_cleanup+0xfe/0x360
[ 15.295402][ T12] netdev_run_todo+0x81f/0xc60
[ 15.295568][ T12] ops_undo_list+0x714/0x890
[ 15.295812][ T12] cleanup_net+0x3b2/0x830
[ 15.295990][ T12] process_one_work+0xe35/0x1650
[ 15.296159][ T12] worker_thread+0x591/0xcf0
[ 15.296334][ T12] kthread+0x37b/0x5f0
[ 15.296553][ T12] ret_from_fork+0x1db/0x270
[ 15.296706][ T12] ret_from_fork_asm+0x11/0x20
[ 15.296877][ T12]
[ 15.296956][ T12] The buggy address belongs to the object at ffff88800a341000
[ 15.296956][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 15.297459][ T12] The buggy address is located 1684 bytes inside of
[ 15.297459][ T12] freed 4096-byte region [ffff88800a341000, ffff88800a342000)
[ 15.297861][ T12]
[ 15.298024][ T12] The buggy address belongs to the physical page:
[ 15.298233][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa340
[ 15.298532][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.298882][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.299105][ T12] page_type: f5(slab)
[ 15.299246][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000207410 ffffea0000207210
[ 15.299664][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.299963][ T12] head: 0080000000000040 ffff888001043700 ffffea0000207410 ffffea0000207210
[ 15.300470][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.300760][ T12] head: 0080000000000003 ffffea000028d001 00000000ffffffff 00000000ffffffff
[ 15.301063][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.301445][ T12] page dumped because: kasan: bad access detected
[ 15.301636][ T12]
[ 15.301721][ T12] Memory state around the buggy address:
[ 15.301966][ T12] ffff88800a341580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.302219][ T12] ffff88800a341600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.302444][ T12] >ffff88800a341680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.302747][ T12] ^
[ 15.302900][ T12] ffff88800a341700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.303150][ T12] ffff88800a341780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.303392][ T12] ==================================================================
[ 15.303675][ T12] Disabling lock debugging due to kernel taint
[ 15.303889][ T12] ------------[ cut here ]------------
[ 15.304155][ T12] refcount_t: underflow; use-after-free.
[ 15.304382][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.304691][ T12] Modules linked in: veth
[ 15.304849][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.305346][ T12] Tainted: [B]=BAD_PAGE
[ 15.305504][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.305833][ T12] Workqueue: netns cleanup_net
[ 15.306043][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.306289][ 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 25 8f 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
[ 15.306872][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 15.307128][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.307392][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.307648][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1f7e134
[ 15.307902][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 15.308793][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.309084][ T12] FS: 0000000000000000(0000) GS:ffff88809f710000(0000) knlGS:0000000000000000
[ 15.309476][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.309780][ T12] CR2: 00007fe0d93b5100 CR3: 0000000009f8e002 CR4: 0000000000772ef0
[ 15.310095][ T12] PKRU: 55555554
[ 15.310260][ T12] Call Trace:
[ 15.310440][ T12]
[ 15.310551][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.310756][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.310968][ T12] ? generic_xdp_install+0x410/0x410
[ 15.311346][ T12] ops_undo_list+0x714/0x890
[ 15.311586][ T12] ? netns_get+0x110/0x110
[ 15.311779][ T12] ? cleanup_net+0x2d6/0x830
[ 15.311965][ T12] cleanup_net+0x3b2/0x830
[ 15.312265][ T12] ? net_passive_dec+0x190/0x190
[ 15.312480][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.312670][ T12] process_one_work+0xe35/0x1650
[ 15.312852][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.313145][ T12] ? assign_work+0x168/0x240
[ 15.313349][ T12] worker_thread+0x591/0xcf0
[ 15.313562][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.313790][ T12] kthread+0x37b/0x5f0
[ 15.313942][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.314284][ T12] ? ret_from_fork+0x1b/0x270
[ 15.314472][ T12] ? __lock_release+0x5d/0x170
[ 15.314695][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.314882][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.315155][ T12] ret_from_fork+0x1db/0x270
[ 15.315344][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.315522][ T12] ret_from_fork_asm+0x11/0x20
[ 15.315709][ T12]
[ 15.315984][ T12] irq event stamp: 2701
[ 15.316137][ T12] hardirqs last enabled at (2701): [] irqentry_exit+0x3b/0x80
[ 15.316518][ T12] hardirqs last disabled at (2700): [] handle_softirqs+0x47f/0x610
[ 15.316909][ T12] softirqs last enabled at (2612): [] handle_softirqs+0x352/0x610
[ 15.317211][ T12] softirqs last disabled at (2605): [] irq_exit_rcu+0xab/0x100
[ 15.317657][ T12] ---[ end trace 0000000000000000 ]---