[ 18.114307][ T12] ==================================================================
[ 18.114636][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 18.114915][ T12] Read of size 1 at addr ffff888006e2c6ac by task kworker/u16:0/12
[ 18.115174][ T12]
[ 18.115265][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.115271][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.115274][ T12] Workqueue: netns cleanup_net
[ 18.115282][ T12] Call Trace:
[ 18.115284][ T12]
[ 18.115287][ T12] dump_stack_lvl+0x82/0xc0
[ 18.115293][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 18.115302][ T12] ? kobject_put+0xbb/0xd0
[ 18.115306][ T12] print_report+0xb4/0x270
[ 18.115310][ T12] ? kobject_put+0xbb/0xd0
[ 18.115313][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 18.115317][ T12] ? kobject_put+0xbb/0xd0
[ 18.115320][ T12] kasan_report+0xca/0x100
[ 18.115325][ T12] ? kobject_put+0xbb/0xd0
[ 18.115330][ T12] kobject_put+0xbb/0xd0
[ 18.115334][ T12] netdev_run_todo+0x5f0/0xc60
[ 18.115340][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 18.115344][ T12] ? generic_xdp_install+0x410/0x410
[ 18.115353][ T12] ops_undo_list+0x714/0x890
[ 18.115365][ T12] ? netns_get+0x110/0x110
[ 18.115370][ T12] ? cleanup_net+0x2d6/0x830
[ 18.115375][ T12] cleanup_net+0x3b2/0x830
[ 18.115378][ T12] ? net_passive_dec+0x190/0x190
[ 18.115382][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.115389][ T12] process_one_work+0xe35/0x1650
[ 18.115398][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 18.115404][ T12] ? assign_work+0x168/0x240
[ 18.115408][ T12] worker_thread+0x591/0xcf0
[ 18.115414][ T12] ? rescuer_thread+0xd10/0xd10
[ 18.115418][ T12] kthread+0x37b/0x5f0
[ 18.115422][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.115425][ T12] ? ret_from_fork+0x1b/0x270
[ 18.115432][ T12] ? __lock_release+0x5d/0x170
[ 18.115439][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.115442][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.115445][ T12] ret_from_fork+0x1db/0x270
[ 18.115448][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.115451][ T12] ret_from_fork_asm+0x11/0x20
[ 18.115461][ T12]
[ 18.115462][ T12]
[ 18.122198][ T12] Allocated by task 241:
[ 18.122328][ T12] kasan_save_stack+0x24/0x40
[ 18.122521][ T12] kasan_save_track+0x14/0x30
[ 18.122696][ T12] __kasan_kmalloc+0x7b/0x90
[ 18.122972][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 18.123143][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 18.123316][ T12] sit_init_net+0x169/0x550
[ 18.123493][ T12] ops_init+0x189/0x550
[ 18.123714][ T12] setup_net+0xf1/0x380
[ 18.123851][ T12] copy_net_ns+0x21a/0x380
[ 18.124029][ T12] create_new_namespaces+0x35f/0x900
[ 18.124205][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 18.124378][ T12] ksys_unshare+0x2a3/0x660
[ 18.124636][ T12] __x64_sys_unshare+0x31/0x40
[ 18.124802][ T12] do_syscall_64+0xc1/0xfd0
[ 18.124992][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.125290][ T12]
[ 18.125381][ T12] Freed by task 12:
[ 18.125515][ T12] kasan_save_stack+0x24/0x40
[ 18.125686][ T12] kasan_save_track+0x14/0x30
[ 18.125862][ T12] __kasan_save_free_info+0x3b/0x60
[ 18.126131][ T12] __kasan_slab_free+0x3f/0x60
[ 18.126300][ T12] kfree+0x21d/0x540
[ 18.126435][ T12] device_release+0x9c/0x210
[ 18.126605][ T12] kobject_cleanup+0xfe/0x360
[ 18.126877][ T12] netdev_run_todo+0x81f/0xc60
[ 18.127071][ T12] ops_undo_list+0x714/0x890
[ 18.127241][ T12] cleanup_net+0x3b2/0x830
[ 18.127412][ T12] process_one_work+0xe35/0x1650
[ 18.127671][ T12] worker_thread+0x591/0xcf0
[ 18.127842][ T12] kthread+0x37b/0x5f0
[ 18.127981][ T12] ret_from_fork+0x1db/0x270
[ 18.128153][ T12] ret_from_fork_asm+0x11/0x20
[ 18.128323][ T12]
[ 18.128503][ T12] The buggy address belongs to the object at ffff888006e2c000
[ 18.128503][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 18.128933][ T12] The buggy address is located 1708 bytes inside of
[ 18.128933][ T12] freed 4096-byte region [ffff888006e2c000, ffff888006e2d000)
[ 18.129445][ T12]
[ 18.129523][ T12] The buggy address belongs to the physical page:
[ 18.129710][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6e28
[ 18.130102][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 18.130337][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 18.130542][ T12] page_type: f5(slab)
[ 18.130759][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000278410 ffffea00002e2c10
[ 18.131055][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 18.131339][ T12] head: 0080000000000040 ffff888001043700 ffffea0000278410 ffffea00002e2c10
[ 18.131717][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 18.132007][ T12] head: 0080000000000003 ffffea00001b8a01 00000000ffffffff 00000000ffffffff
[ 18.132374][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 18.132654][ T12] page dumped because: kasan: bad access detected
[ 18.132952][ T12]
[ 18.133030][ T12] Memory state around the buggy address:
[ 18.133182][ T12] ffff888006e2c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.133408][ T12] ffff888006e2c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.133721][ T12] >ffff888006e2c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.133962][ T12] ^
[ 18.134113][ T12] ffff888006e2c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.134428][ T12] ffff888006e2c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.134645][ T12] ==================================================================
[ 18.134977][ T12] Disabling lock debugging due to kernel taint
[ 18.135279][ T12] ------------[ cut here ]------------
[ 18.135519][ T12] refcount_t: underflow; use-after-free.
[ 18.135720][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.136056][ T12] Modules linked in: nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
[ 18.136403][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.136836][ T12] Tainted: [B]=BAD_PAGE
[ 18.136984][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.137210][ T12] Workqueue: netns cleanup_net
[ 18.137389][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.137640][ T12] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de 45 8c e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 18.138288][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 18.138539][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.138844][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.139123][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff19be220
[ 18.139398][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 18.139677][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.139973][ T12] FS: 0000000000000000(0000) GS:ffff8880a7fec000(0000) knlGS:0000000000000000
[ 18.140283][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.140617][ T12] CR2: 000055e88a493a53 CR3: 0000000033535005 CR4: 0000000000772ef0
[ 18.140882][ T12] PKRU: 55555554
[ 18.141019][ T12] Call Trace:
[ 18.141674][ T12]
[ 18.141777][ T12] netdev_run_todo+0x5f0/0xc60
[ 18.141989][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 18.142269][ T12] ? generic_xdp_install+0x410/0x410
[ 18.142557][ T12] ops_undo_list+0x714/0x890
[ 18.142733][ T12] ? netns_get+0x110/0x110
[ 18.142928][ T12] ? cleanup_net+0x2d6/0x830
[ 18.143104][ T12] cleanup_net+0x3b2/0x830
[ 18.143285][ T12] ? net_passive_dec+0x190/0x190
[ 18.143488][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.143678][ T12] process_one_work+0xe35/0x1650
[ 18.143871][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 18.144147][ T12] ? assign_work+0x168/0x240
[ 18.144324][ T12] worker_thread+0x591/0xcf0
[ 18.144526][ T12] ? rescuer_thread+0xd10/0xd10
[ 18.144703][ T12] kthread+0x37b/0x5f0
[ 18.144845][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.145116][ T12] ? ret_from_fork+0x1b/0x270
[ 18.145310][ T12] ? __lock_release+0x5d/0x170
[ 18.145514][ T12] ? rcu_is_watching+0x12/0xb0
[ 18.145689][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.145980][ T12] ret_from_fork+0x1db/0x270
[ 18.146149][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.146322][ T12] ret_from_fork_asm+0x11/0x20
[ 18.146527][ T12]
[ 18.146660][ T12] irq event stamp: 7129
[ 18.146794][ T12] hardirqs last enabled at (7129): [] finish_task_switch.isra.0+0x245/0x960
[ 18.147159][ T12] hardirqs last disabled at (7128): [] __schedule+0x94a/0x1b10
[ 18.147589][ T12] softirqs last enabled at (6530): [] handle_softirqs+0x352/0x610
[ 18.147901][ T12] softirqs last disabled at (6457): [] irq_exit_rcu+0xab/0x100
[ 18.148316][ T12] ---[ end trace 0000000000000000 ]---