[ 15.263323][ T12] ==================================================================
[ 15.263862][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.264314][ T12] Read of size 1 at addr ffff888008924694 by task kworker/u16:0/12
[ 15.264751][ T12]
[ 15.264942][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.264950][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.264954][ T12] Workqueue: netns cleanup_net
[ 15.264963][ T12] Call Trace:
[ 15.264967][ T12]
[ 15.264971][ T12] dump_stack_lvl+0x82/0xc0
[ 15.264980][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 15.264995][ T12] ? kobject_put+0xbb/0xd0
[ 15.265000][ T12] print_report+0xb4/0x270
[ 15.265006][ T12] ? kobject_put+0xbb/0xd0
[ 15.265011][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 15.265017][ T12] ? kobject_put+0xbb/0xd0
[ 15.265022][ T12] kasan_report+0xca/0x100
[ 15.265029][ T12] ? kobject_put+0xbb/0xd0
[ 15.265039][ T12] kobject_put+0xbb/0xd0
[ 15.265045][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.265053][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.265059][ T12] ? generic_xdp_install+0x410/0x410
[ 15.265071][ T12] ops_undo_list+0x714/0x890
[ 15.265080][ T12] ? netns_get+0x110/0x110
[ 15.265083][ T12] ? cleanup_net+0x2d6/0x830
[ 15.265092][ T12] cleanup_net+0x3b2/0x830
[ 15.265100][ T12] ? net_passive_dec+0x190/0x190
[ 15.265108][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.265118][ T12] process_one_work+0xe35/0x1650
[ 15.265131][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.265141][ T12] ? assign_work+0x168/0x240
[ 15.265147][ T12] worker_thread+0x591/0xcf0
[ 15.265158][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.265164][ T12] kthread+0x37b/0x5f0
[ 15.265171][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.265175][ T12] ? ret_from_fork+0x1b/0x270
[ 15.265183][ T12] ? __lock_release+0x5d/0x170
[ 15.265193][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.265198][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.265204][ T12] ret_from_fork+0x1db/0x270
[ 15.265210][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.265215][ T12] ret_from_fork_asm+0x11/0x20
[ 15.265235][ T12]
[ 15.265238][ T12]
[ 15.275790][ T12] Allocated by task 228:
[ 15.276031][ T12] kasan_save_stack+0x24/0x40
[ 15.276337][ T12] kasan_save_track+0x14/0x30
[ 15.276611][ T12] __kasan_kmalloc+0x7b/0x90
[ 15.276892][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.277230][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 15.277518][ T12] sit_init_net+0x169/0x550
[ 15.277802][ T12] ops_init+0x189/0x550
[ 15.278017][ T12] setup_net+0xf1/0x380
[ 15.278256][ T12] copy_net_ns+0x21a/0x380
[ 15.278547][ T12] create_new_namespaces+0x35f/0x900
[ 15.278861][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 15.279138][ T12] ksys_unshare+0x2a3/0x660
[ 15.279430][ T12] __x64_sys_unshare+0x31/0x40
[ 15.279728][ T12] do_syscall_64+0xc1/0xfd0
[ 15.280029][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.280406][ T12]
[ 15.280550][ T12] Freed by task 12:
[ 15.280777][ T12] kasan_save_stack+0x24/0x40
[ 15.281069][ T12] kasan_save_track+0x14/0x30
[ 15.281343][ T12] __kasan_save_free_info+0x3b/0x60
[ 15.281630][ T12] __kasan_slab_free+0x3f/0x60
[ 15.281913][ T12] kfree+0x21d/0x540
[ 15.282140][ T12] device_release+0x9c/0x210
[ 15.282456][ T12] kobject_cleanup+0xfe/0x360
[ 15.282751][ T12] netdev_run_todo+0x81f/0xc60
[ 15.283061][ T12] ops_undo_list+0x714/0x890
[ 15.283348][ T12] cleanup_net+0x3b2/0x830
[ 15.283614][ T12] process_one_work+0xe35/0x1650
[ 15.283898][ T12] worker_thread+0x591/0xcf0
[ 15.284164][ T12] kthread+0x37b/0x5f0
[ 15.284396][ T12] ret_from_fork+0x1db/0x270
[ 15.284663][ T12] ret_from_fork_asm+0x11/0x20
[ 15.284948][ T12]
[ 15.285077][ T12] The buggy address belongs to the object at ffff888008924000
[ 15.285077][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 15.285728][ T12] The buggy address is located 1684 bytes inside of
[ 15.285728][ T12] freed 4096-byte region [ffff888008924000, ffff888008925000)
[ 15.286417][ T12]
[ 15.286550][ T12] The buggy address belongs to the physical page:
[ 15.286878][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8920
[ 15.287366][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.287773][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.288157][ T12] page_type: f5(slab)
[ 15.288373][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001dac10 ffffea000020e010
[ 15.288862][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.289365][ T12] head: 0080000000000040 ffff888001043700 ffffea00001dac10 ffffea000020e010
[ 15.289885][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.290392][ T12] head: 0080000000000003 ffffea0000224801 00000000ffffffff 00000000ffffffff
[ 15.290875][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.291391][ T12] page dumped because: kasan: bad access detected
[ 15.291727][ T12]
[ 15.291885][ T12] Memory state around the buggy address:
[ 15.292158][ T12] ffff888008924580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.292562][ T12] ffff888008924600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.292967][ T12] >ffff888008924680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.293395][ T12] ^
[ 15.293655][ T12] ffff888008924700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.294062][ T12] ffff888008924780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.294472][ T12] ==================================================================
[ 15.295075][ T12] Disabling lock debugging due to kernel taint
[ 15.295422][ T12] ------------[ cut here ]------------
[ 15.295791][ T12] refcount_t: underflow; use-after-free.
[ 15.296130][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.296619][ T12] Modules linked in: veth
[ 15.296891][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.297580][ T12] Tainted: [B]=BAD_PAGE
[ 15.297799][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.298160][ T12] Workqueue: netns cleanup_net
[ 15.298517][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.298949][ 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 85 b1 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
[ 15.299915][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 15.300309][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.300866][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.301402][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff643e134
[ 15.301948][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 15.302501][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.303042][ T12] FS: 0000000000000000(0000) GS:ffff888082d10000(0000) knlGS:0000000000000000
[ 15.303653][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.304098][ T12] CR2: 000055878f5f7150 CR3: 000000000c4ba004 CR4: 0000000000772ef0
[ 15.304706][ T12] PKRU: 55555554
[ 15.305073][ T12] Call Trace:
[ 15.305403][ T12]
[ 15.305701][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.306097][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.306505][ T12] ? generic_xdp_install+0x410/0x410
[ 15.306927][ T12] ops_undo_list+0x714/0x890
[ 15.307340][ T12] ? netns_get+0x110/0x110
[ 15.307729][ T12] ? cleanup_net+0x2d6/0x830
[ 15.308162][ T12] cleanup_net+0x3b2/0x830
[ 15.308559][ T12] ? net_passive_dec+0x190/0x190
[ 15.308996][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.309404][ T12] process_one_work+0xe35/0x1650
[ 15.309822][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.310255][ T12] ? assign_work+0x168/0x240
[ 15.310703][ T12] worker_thread+0x591/0xcf0
[ 15.311093][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.311494][ T12] kthread+0x37b/0x5f0
[ 15.311837][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.312234][ T12] ? ret_from_fork+0x1b/0x270
[ 15.312643][ T12] ? __lock_release+0x5d/0x170
[ 15.313047][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.313420][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.313825][ T12] ret_from_fork+0x1db/0x270
[ 15.314206][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.314603][ T12] ret_from_fork_asm+0x11/0x20
[ 15.315016][ T12]
[ 15.315361][ T12] irq event stamp: 2815
[ 15.315722][ T12] hardirqs last enabled at (2815): [] finish_task_switch.isra.0+0x245/0x960
[ 15.316417][ T12] hardirqs last disabled at (2814): [] __schedule+0x94a/0x1b10
[ 15.317059][ T12] softirqs last enabled at (2750): [] handle_softirqs+0x352/0x610
[ 15.317735][ T12] softirqs last disabled at (2743): [] irq_exit_rcu+0xab/0x100
[ 15.318354][ T12] ---[ end trace 0000000000000000 ]---