[ 38.799765][ T12] ==================================================================
[ 38.800070][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 38.800327][ T12] Read of size 1 at addr ffff8880090416c4 by task kworker/u16:0/12
[ 38.800575][ T12]
[ 38.800663][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 38.800668][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 38.800672][ T12] Workqueue: netns cleanup_net
[ 38.800682][ T12] Call Trace:
[ 38.800685][ T12]
[ 38.800688][ T12] dump_stack_lvl+0x82/0xc0
[ 38.800694][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 38.800704][ T12] ? kobject_put+0xbb/0xd0
[ 38.800710][ T12] print_report+0xb4/0x270
[ 38.800715][ T12] ? kobject_put+0xbb/0xd0
[ 38.800719][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 38.800724][ T12] ? kobject_put+0xbb/0xd0
[ 38.800726][ T12] kasan_report+0xca/0x100
[ 38.800731][ T12] ? kobject_put+0xbb/0xd0
[ 38.800736][ T12] kobject_put+0xbb/0xd0
[ 38.800740][ T12] netdev_run_todo+0x5f0/0xc60
[ 38.800746][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 38.800750][ T12] ? generic_xdp_install+0x410/0x410
[ 38.800753][ T12] ? net_generic+0xb1/0x1f0
[ 38.800762][ T12] ops_undo_list+0x714/0x890
[ 38.800767][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 38.800770][ T12] ? cleanup_net+0x2d6/0x8b0
[ 38.800776][ T12] cleanup_net+0x3b2/0x8b0
[ 38.800781][ T12] ? net_passive_dec+0x190/0x190
[ 38.800786][ T12] ? rcu_is_watching+0x12/0xb0
[ 38.800794][ T12] process_one_work+0xe35/0x1650
[ 38.800805][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 38.800810][ T12] ? assign_work+0x168/0x240
[ 38.800815][ T12] worker_thread+0x591/0xcf0
[ 38.800821][ T12] ? rescuer_thread+0xd10/0xd10
[ 38.800825][ T12] kthread+0x37b/0x5f0
[ 38.800829][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.800832][ T12] ? ret_from_fork+0x1b/0x270
[ 38.800837][ T12] ? __lock_release+0x5d/0x170
[ 38.800842][ T12] ? rcu_is_watching+0x12/0xb0
[ 38.800846][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.800849][ T12] ret_from_fork+0x1db/0x270
[ 38.800852][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.800855][ T12] ret_from_fork_asm+0x11/0x20
[ 38.800864][ T12]
[ 38.800865][ T12]
[ 38.807272][ T12] Allocated by task 382:
[ 38.807397][ T12] kasan_save_stack+0x24/0x40
[ 38.807658][ T12] kasan_save_track+0x14/0x30
[ 38.807829][ T12] __kasan_kmalloc+0x7b/0x90
[ 38.807989][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 38.808151][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 38.808313][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 38.808477][ T12] ops_init+0x189/0x550
[ 38.808600][ T12] setup_net+0xf1/0x380
[ 38.808733][ T12] copy_net_ns+0x253/0x510
[ 38.808896][ T12] create_new_namespaces+0x35f/0x900
[ 38.809147][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 38.809305][ T12] ksys_unshare+0x2be/0x6e0
[ 38.809466][ T12] __x64_sys_unshare+0x31/0x40
[ 38.809628][ T12] do_syscall_64+0xc1/0xfd0
[ 38.809801][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 38.810003][ T12]
[ 38.810084][ T12] Freed by task 12:
[ 38.810210][ T12] kasan_save_stack+0x24/0x40
[ 38.810479][ T12] kasan_save_track+0x14/0x30
[ 38.810646][ T12] __kasan_save_free_info+0x3b/0x60
[ 38.810817][ T12] __kasan_slab_free+0x3f/0x60
[ 38.810987][ T12] kfree+0x21d/0x540
[ 38.811114][ T12] device_release+0x9c/0x210
[ 38.811277][ T12] kobject_cleanup+0xfe/0x360
[ 38.811445][ T12] netdev_run_todo+0x81f/0xc60
[ 38.811620][ T12] ops_undo_list+0x714/0x890
[ 38.811881][ T12] cleanup_net+0x3b2/0x8b0
[ 38.812043][ T12] process_one_work+0xe35/0x1650
[ 38.812197][ T12] worker_thread+0x591/0xcf0
[ 38.812362][ T12] kthread+0x37b/0x5f0
[ 38.812479][ T12] ret_from_fork+0x1db/0x270
[ 38.812773][ T12] ret_from_fork_asm+0x11/0x20
[ 38.812933][ T12]
[ 38.813028][ T12] The buggy address belongs to the object at ffff888009041000
[ 38.813028][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 38.813496][ T12] The buggy address is located 1732 bytes inside of
[ 38.813496][ T12] freed 4096-byte region [ffff888009041000, ffff888009042000)
[ 38.813896][ T12]
[ 38.813985][ T12] The buggy address belongs to the physical page:
[ 38.814286][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9040
[ 38.814598][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 38.814957][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 38.815175][ T12] page_type: f5(slab)
[ 38.815311][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000246810 ffffea0000251210
[ 38.815733][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 38.816035][ T12] head: 0080000000000040 ffff888001043700 ffffea0000246810 ffffea0000251210
[ 38.816346][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 38.816748][ T12] head: 0080000000000003 ffffea0000241001 00000000ffffffff 00000000ffffffff
[ 38.817045][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 38.817434][ T12] page dumped because: kasan: bad access detected
[ 38.817657][ T12]
[ 38.817755][ T12] Memory state around the buggy address:
[ 38.817928][ T12] ffff888009041580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.818268][ T12] ffff888009041600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.818512][ T12] >ffff888009041680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.818851][ T12] ^
[ 38.819059][ T12] ffff888009041700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.819321][ T12] ffff888009041780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 38.819654][ T12] ==================================================================
[ 38.820453][ T12] Disabling lock debugging due to kernel taint
[ 38.820671][ T12] ------------[ cut here ]------------
[ 38.820841][ T12] refcount_t: underflow; use-after-free.
[ 38.821043][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 38.821398][ T12] Modules linked in:
[ 38.821523][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 38.821883][ T12] Tainted: [B]=BAD_PAGE
[ 38.822000][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 38.822194][ T12] Workqueue: netns cleanup_net
[ 38.822427][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 38.822636][ T12] 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 25 92 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
[ 38.823176][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 38.823432][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 38.823660][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 38.823903][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2640934
[ 38.824129][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 38.824419][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 38.824647][ T12] FS: 0000000000000000(0000) GS:ffff8880d8908000(0000) knlGS:0000000000000000
[ 38.824925][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 38.825122][ T12] CR2: 00007fe1bdcc1178 CR3: 000000000df49001 CR4: 0000000000772ef0
[ 38.825413][ T12] PKRU: 55555554
[ 38.825530][ T12] Call Trace:
[ 38.825667][ T12]
[ 38.825761][ T12] netdev_run_todo+0x5f0/0xc60
[ 38.825923][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 38.826089][ T12] ? generic_xdp_install+0x410/0x410
[ 38.826243][ T12] ? net_generic+0xb1/0x1f0
[ 38.826468][ T12] ops_undo_list+0x714/0x890
[ 38.826625][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 38.826787][ T12] ? cleanup_net+0x2d6/0x8b0
[ 38.826940][ T12] cleanup_net+0x3b2/0x8b0
[ 38.827088][ T12] ? net_passive_dec+0x190/0x190
[ 38.827236][ T12] ? rcu_is_watching+0x12/0xb0
[ 38.827454][ T12] process_one_work+0xe35/0x1650
[ 38.827607][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 38.827825][ T12] ? assign_work+0x168/0x240
[ 38.827975][ T12] worker_thread+0x591/0xcf0
[ 38.828125][ T12] ? rescuer_thread+0xd10/0xd10
[ 38.828273][ T12] kthread+0x37b/0x5f0
[ 38.828460][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.828615][ T12] ? ret_from_fork+0x1b/0x270
[ 38.828782][ T12] ? __lock_release+0x5d/0x170
[ 38.828933][ T12] ? rcu_is_watching+0x12/0xb0
[ 38.829084][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.829231][ T12] ret_from_fork+0x1db/0x270
[ 38.829450][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 38.829609][ T12] ret_from_fork_asm+0x11/0x20
[ 38.829778][ T12]
[ 38.829897][ T12] irq event stamp: 10379
[ 38.830020][ T12] hardirqs last enabled at (10379): [] irqentry_exit+0x3b/0x80
[ 38.830362][ T12] hardirqs last disabled at (10378): [] handle_softirqs+0x47f/0x610
[ 38.830628][ T12] softirqs last enabled at (9392): [] handle_softirqs+0x352/0x610
[ 38.830897][ T12] softirqs last disabled at (9385): [] irq_exit_rcu+0xab/0x100
[ 38.831245][ T12] ---[ end trace 0000000000000000 ]---