[ 14.644838][ T12] ==================================================================
[ 14.645284][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.645586][ T12] Read of size 1 at addr ffff888007c31694 by task kworker/u16:0/12
[ 14.645837][ T12]
[ 14.645934][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.645940][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.645943][ T12] Workqueue: netns cleanup_net
[ 14.645951][ T12] Call Trace:
[ 14.645953][ T12]
[ 14.645956][ T12] dump_stack_lvl+0x82/0xc0
[ 14.645962][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 14.645972][ T12] ? kobject_put+0xbb/0xd0
[ 14.645976][ T12] print_report+0xb4/0x270
[ 14.645980][ T12] ? kobject_put+0xbb/0xd0
[ 14.645983][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 14.645987][ T12] ? kobject_put+0xbb/0xd0
[ 14.645989][ T12] kasan_report+0xca/0x100
[ 14.645994][ T12] ? kobject_put+0xbb/0xd0
[ 14.645999][ T12] kobject_put+0xbb/0xd0
[ 14.646002][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.646009][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.646013][ T12] ? generic_xdp_install+0x410/0x410
[ 14.646020][ T12] ops_undo_list+0x714/0x890
[ 14.646024][ T12] ? netns_get+0x110/0x110
[ 14.646026][ T12] ? cleanup_net+0x2d6/0x830
[ 14.646031][ T12] cleanup_net+0x3b2/0x830
[ 14.646034][ T12] ? net_passive_dec+0x190/0x190
[ 14.646038][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.646045][ T12] process_one_work+0xe35/0x1650
[ 14.646054][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.646059][ T12] ? assign_work+0x168/0x240
[ 14.646063][ T12] worker_thread+0x591/0xcf0
[ 14.646068][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.646071][ T12] kthread+0x37b/0x5f0
[ 14.646075][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.646077][ T12] ? ret_from_fork+0x1b/0x270
[ 14.646084][ T12] ? __lock_release+0x5d/0x170
[ 14.646091][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.646093][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.646096][ T12] ret_from_fork+0x1db/0x270
[ 14.646100][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.646102][ T12] ret_from_fork_asm+0x11/0x20
[ 14.646111][ T12]
[ 14.646112][ T12]
[ 14.653705][ T12] Allocated by task 228:
[ 14.653828][ T12] kasan_save_stack+0x24/0x40
[ 14.653999][ T12] kasan_save_track+0x14/0x30
[ 14.654195][ T12] __kasan_kmalloc+0x7b/0x90
[ 14.654359][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.654558][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 14.654717][ T12] sit_init_net+0x169/0x550
[ 14.654884][ T12] ops_init+0x189/0x550
[ 14.655005][ T12] setup_net+0xf1/0x380
[ 14.655152][ T12] copy_net_ns+0x21a/0x380
[ 14.655324][ T12] create_new_namespaces+0x35f/0x900
[ 14.655560][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 14.655747][ T12] ksys_unshare+0x2a3/0x660
[ 14.655924][ T12] __x64_sys_unshare+0x31/0x40
[ 14.656123][ T12] do_syscall_64+0xc1/0xfd0
[ 14.656327][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.656556][ T12]
[ 14.656658][ T12] Freed by task 12:
[ 14.656781][ T12] kasan_save_stack+0x24/0x40
[ 14.656954][ T12] kasan_save_track+0x14/0x30
[ 14.657122][ T12] __kasan_save_free_info+0x3b/0x60
[ 14.657300][ T12] __kasan_slab_free+0x3f/0x60
[ 14.657492][ T12] kfree+0x21d/0x540
[ 14.657618][ T12] device_release+0x9c/0x210
[ 14.657794][ T12] kobject_cleanup+0xfe/0x360
[ 14.657974][ T12] netdev_run_todo+0x81f/0xc60
[ 14.658148][ T12] ops_undo_list+0x714/0x890
[ 14.658331][ T12] cleanup_net+0x3b2/0x830
[ 14.658521][ T12] process_one_work+0xe35/0x1650
[ 14.658699][ T12] worker_thread+0x591/0xcf0
[ 14.658877][ T12] kthread+0x37b/0x5f0
[ 14.659012][ T12] ret_from_fork+0x1db/0x270
[ 14.659198][ T12] ret_from_fork_asm+0x11/0x20
[ 14.659379][ T12]
[ 14.659489][ T12] The buggy address belongs to the object at ffff888007c31000
[ 14.659489][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 14.659920][ T12] The buggy address is located 1684 bytes inside of
[ 14.659920][ T12] freed 4096-byte region [ffff888007c31000, ffff888007c32000)
[ 14.660357][ T12]
[ 14.660466][ T12] The buggy address belongs to the physical page:
[ 14.660702][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c30
[ 14.661022][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.661302][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.661581][ T12] page_type: f5(slab)
[ 14.661791][ T12] raw: 0080000000000040 ffff888001043700 ffffea00000a5810 ffffea000014e610
[ 14.662309][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.662786][ T12] head: 0080000000000040 ffff888001043700 ffffea00000a5810 ffffea000014e610
[ 14.663285][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.663758][ T12] head: 0080000000000003 ffffea00001f0c01 00000000ffffffff 00000000ffffffff
[ 14.664246][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.664716][ T12] page dumped because: kasan: bad access detected
[ 14.665051][ T12]
[ 14.665173][ T12] Memory state around the buggy address:
[ 14.665421][ T12] ffff888007c31580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.665786][ T12] ffff888007c31600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.666168][ T12] >ffff888007c31680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.666553][ T12] ^
[ 14.666798][ T12] ffff888007c31700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.667171][ T12] ffff888007c31780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.667553][ T12] ==================================================================
[ 14.668536][ T12] Disabling lock debugging due to kernel taint
[ 14.668858][ T12] ------------[ cut here ]------------
[ 14.669429][ T12] refcount_t: underflow; use-after-free.
[ 14.669748][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.670259][ T12] Modules linked in: veth
[ 14.670479][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.671076][ T12] Tainted: [B]=BAD_PAGE
[ 14.671275][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.671606][ T12] Workqueue: netns cleanup_net
[ 14.671888][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.672256][ 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 65 bc 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
[ 14.673220][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 14.673552][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.673962][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.674379][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff79fe134
[ 14.674805][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 14.675229][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.675625][ T12] FS: 0000000000000000(0000) GS:ffff888077f90000(0000) knlGS:0000000000000000
[ 14.676099][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.676438][ T12] CR2: 00007f98cb30e0c8 CR3: 0000000008f0a005 CR4: 0000000000772ef0
[ 14.676843][ T12] PKRU: 55555554
[ 14.677057][ T12] Call Trace:
[ 14.677260][ T12]
[ 14.677403][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.677694][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.678160][ T12] ? generic_xdp_install+0x410/0x410
[ 14.678439][ T12] ops_undo_list+0x714/0x890
[ 14.678710][ T12] ? netns_get+0x110/0x110
[ 14.679095][ T12] ? cleanup_net+0x2d6/0x830
[ 14.679359][ T12] cleanup_net+0x3b2/0x830
[ 14.679609][ T12] ? net_passive_dec+0x190/0x190
[ 14.679877][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.680270][ T12] process_one_work+0xe35/0x1650
[ 14.680548][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.680815][ T12] ? assign_work+0x168/0x240
[ 14.681195][ T12] worker_thread+0x591/0xcf0
[ 14.681469][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.681763][ T12] kthread+0x37b/0x5f0
[ 14.682082][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.682345][ T12] ? ret_from_fork+0x1b/0x270
[ 14.682621][ T12] ? __lock_release+0x5d/0x170
[ 14.682891][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.683245][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.683505][ T12] ret_from_fork+0x1db/0x270
[ 14.683768][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.684149][ T12] ret_from_fork_asm+0x11/0x20
[ 14.684420][ T12]
[ 14.684619][ T12] irq event stamp: 2799
[ 14.684840][ T12] hardirqs last enabled at (2799): [] finish_task_switch.isra.0+0x245/0x960
[ 14.685468][ T12] hardirqs last disabled at (2798): [] __schedule+0x94a/0x1b10
[ 14.685920][ T12] softirqs last enabled at (2508): [] handle_softirqs+0x352/0x610
[ 14.686493][ T12] softirqs last disabled at (2393): [] irq_exit_rcu+0xab/0x100
[ 14.687082][ T12] ---[ end trace 0000000000000000 ]---