[ 15.369214][ T12] ==================================================================
[ 15.369543][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.369819][ T12] Read of size 1 at addr ffff888009081694 by task kworker/u16:0/12
[ 15.370060][ T12]
[ 15.370150][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.370155][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.370158][ T12] Workqueue: netns cleanup_net
[ 15.370166][ T12] Call Trace:
[ 15.370168][ T12]
[ 15.370171][ T12] dump_stack_lvl+0x82/0xc0
[ 15.370177][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 15.370186][ T12] ? kobject_put+0xbb/0xd0
[ 15.370190][ T12] print_report+0xb4/0x270
[ 15.370193][ T12] ? kobject_put+0xbb/0xd0
[ 15.370196][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 15.370200][ T12] ? kobject_put+0xbb/0xd0
[ 15.370203][ T12] kasan_report+0xca/0x100
[ 15.370207][ T12] ? kobject_put+0xbb/0xd0
[ 15.370213][ T12] kobject_put+0xbb/0xd0
[ 15.370216][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.370222][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.370227][ T12] ? generic_xdp_install+0x410/0x410
[ 15.370233][ T12] ops_undo_list+0x714/0x890
[ 15.370237][ T12] ? netns_get+0x110/0x110
[ 15.370239][ T12] ? cleanup_net+0x2d6/0x830
[ 15.370244][ T12] cleanup_net+0x3b2/0x830
[ 15.370247][ T12] ? net_passive_dec+0x190/0x190
[ 15.370251][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.370257][ T12] process_one_work+0xe35/0x1650
[ 15.370265][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.370270][ T12] ? assign_work+0x168/0x240
[ 15.370274][ T12] worker_thread+0x591/0xcf0
[ 15.370279][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.370282][ T12] kthread+0x37b/0x5f0
[ 15.370286][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.370288][ T12] ? ret_from_fork+0x1b/0x270
[ 15.370293][ T12] ? __lock_release+0x5d/0x170
[ 15.370298][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.370301][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.370304][ T12] ret_from_fork+0x1db/0x270
[ 15.370307][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.370309][ T12] ret_from_fork_asm+0x11/0x20
[ 15.370317][ T12]
[ 15.370319][ T12]
[ 15.376820][ T12] Allocated by task 228:
[ 15.376953][ T12] kasan_save_stack+0x24/0x40
[ 15.377150][ T12] kasan_save_track+0x14/0x30
[ 15.377313][ T12] __kasan_kmalloc+0x7b/0x90
[ 15.377477][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.377679][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 15.377846][ T12] sit_init_net+0x169/0x550
[ 15.378023][ T12] ops_init+0x189/0x550
[ 15.378146][ T12] setup_net+0xf1/0x380
[ 15.378285][ T12] copy_net_ns+0x21a/0x380
[ 15.378447][ T12] create_new_namespaces+0x35f/0x900
[ 15.378624][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 15.378802][ T12] ksys_unshare+0x2a3/0x660
[ 15.378995][ T12] __x64_sys_unshare+0x31/0x40
[ 15.379178][ T12] do_syscall_64+0xc1/0xfd0
[ 15.379340][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.379570][ T12]
[ 15.379661][ T12] Freed by task 12:
[ 15.379789][ T12] kasan_save_stack+0x24/0x40
[ 15.379970][ T12] kasan_save_track+0x14/0x30
[ 15.380157][ T12] __kasan_save_free_info+0x3b/0x60
[ 15.380342][ T12] __kasan_slab_free+0x3f/0x60
[ 15.380502][ T12] kfree+0x21d/0x540
[ 15.380642][ T12] device_release+0x9c/0x210
[ 15.380806][ T12] kobject_cleanup+0xfe/0x360
[ 15.381012][ T12] netdev_run_todo+0x81f/0xc60
[ 15.381176][ T12] ops_undo_list+0x714/0x890
[ 15.381368][ T12] cleanup_net+0x3b2/0x830
[ 15.381536][ T12] process_one_work+0xe35/0x1650
[ 15.381705][ T12] worker_thread+0x591/0xcf0
[ 15.381865][ T12] kthread+0x37b/0x5f0
[ 15.382010][ T12] ret_from_fork+0x1db/0x270
[ 15.382172][ T12] ret_from_fork_asm+0x11/0x20
[ 15.382363][ T12]
[ 15.382448][ T12] The buggy address belongs to the object at ffff888009081000
[ 15.382448][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 15.382848][ T12] The buggy address is located 1684 bytes inside of
[ 15.382848][ T12] freed 4096-byte region [ffff888009081000, ffff888009082000)
[ 15.383239][ T12]
[ 15.383322][ T12] The buggy address belongs to the physical page:
[ 15.383517][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9080
[ 15.383809][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.384059][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.384264][ T12] page_type: f5(slab)
[ 15.384399][ T12] raw: 0080000000000040 ffff888001043700 ffffea000021c010 ffffea0000204610
[ 15.384701][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.384994][ T12] head: 0080000000000040 ffff888001043700 ffffea000021c010 ffffea0000204610
[ 15.385320][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.385616][ T12] head: 0080000000000003 ffffea0000242001 00000000ffffffff 00000000ffffffff
[ 15.385913][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.386302][ T12] page dumped because: kasan: bad access detected
[ 15.386516][ T12]
[ 15.386601][ T12] Memory state around the buggy address:
[ 15.386761][ T12] ffff888009081580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.386996][ T12] ffff888009081600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.387258][ T12] >ffff888009081680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.387499][ T12] ^
[ 15.387657][ T12] ffff888009081700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.387884][ T12] ffff888009081780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.388203][ T12] ==================================================================
[ 15.388490][ T12] Disabling lock debugging due to kernel taint
[ 15.388691][ T12] ------------[ cut here ]------------
[ 15.388999][ T12] refcount_t: underflow; use-after-free.
[ 15.389198][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.389483][ T12] Modules linked in: veth
[ 15.389666][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.390119][ T12] Tainted: [B]=BAD_PAGE
[ 15.390247][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.390444][ T12] Workqueue: netns cleanup_net
[ 15.390618][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.390823][ 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 45 95 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
[ 15.391495][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 15.391704][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.391946][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.392304][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2bbe134
[ 15.392561][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 15.392922][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.393201][ T12] FS: 0000000000000000(0000) GS:ffff888099410000(0000) knlGS:0000000000000000
[ 15.393574][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.393778][ T12] CR2: 00007f4e0b548eb0 CR3: 000000000a342001 CR4: 0000000000772ef0
[ 15.394017][ T12] PKRU: 55555554
[ 15.394139][ T12] Call Trace:
[ 15.394271][ T12]
[ 15.394359][ T12] netdev_run_todo+0x5f0/0xc60
[ 15.394612][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 15.394771][ T12] ? generic_xdp_install+0x410/0x410
[ 15.394937][ T12] ops_undo_list+0x714/0x890
[ 15.395196][ T12] ? netns_get+0x110/0x110
[ 15.395360][ T12] ? cleanup_net+0x2d6/0x830
[ 15.395573][ T12] cleanup_net+0x3b2/0x830
[ 15.395829][ T12] ? net_passive_dec+0x190/0x190
[ 15.396280][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.396572][ T12] process_one_work+0xe35/0x1650
[ 15.396850][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.397116][ T12] ? assign_work+0x168/0x240
[ 15.397401][ T12] worker_thread+0x591/0xcf0
[ 15.397666][ T12] ? rescuer_thread+0xd10/0xd10
[ 15.398053][ T12] kthread+0x37b/0x5f0
[ 15.398191][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.398440][ T12] ? ret_from_fork+0x1b/0x270
[ 15.398598][ T12] ? __lock_release+0x5d/0x170
[ 15.398759][ T12] ? rcu_is_watching+0x12/0xb0
[ 15.398953][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.399118][ T12] ret_from_fork+0x1db/0x270
[ 15.399280][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.399457][ T12] ret_from_fork_asm+0x11/0x20
[ 15.399621][ T12]
[ 15.399852][ T12] irq event stamp: 4295
[ 15.399985][ T12] hardirqs last enabled at (4295): [] irqentry_exit+0x3b/0x80
[ 15.400269][ T12] hardirqs last disabled at (4294): [] handle_softirqs+0x47f/0x610
[ 15.400651][ T12] softirqs last enabled at (4218): [] handle_softirqs+0x352/0x610
[ 15.400948][ T12] softirqs last disabled at (4211): [] irq_exit_rcu+0xab/0x100
[ 15.401316][ T12] ---[ end trace 0000000000000000 ]---