[ 117.032039][ T68] ==================================================================
[ 117.032328][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 117.032581][ T68] Read of size 1 at addr ffff888008ba16c4 by task kworker/u16:1/68
[ 117.032812][ T68]
[ 117.032897][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 117.032903][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 117.032906][ T68] Workqueue: netns cleanup_net
[ 117.032915][ T68] Call Trace:
[ 117.032918][ T68]
[ 117.032920][ T68] dump_stack_lvl+0x82/0xc0
[ 117.032926][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 117.032936][ T68] ? kobject_put+0xbb/0xd0
[ 117.032940][ T68] print_report+0xb4/0x270
[ 117.032944][ T68] ? kobject_put+0xbb/0xd0
[ 117.032950][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 117.032953][ T68] ? kobject_put+0xbb/0xd0
[ 117.032956][ T68] kasan_report+0xca/0x100
[ 117.032960][ T68] ? kobject_put+0xbb/0xd0
[ 117.032966][ T68] kobject_put+0xbb/0xd0
[ 117.032969][ T68] netdev_run_todo+0x5f0/0xc60
[ 117.032976][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 117.032979][ T68] ? generic_xdp_install+0x410/0x410
[ 117.032982][ T68] ? net_generic+0xb1/0x1f0
[ 117.032992][ T68] ops_undo_list+0x714/0x890
[ 117.032997][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 117.033000][ T68] ? cleanup_net+0x2d6/0x8b0
[ 117.033006][ T68] cleanup_net+0x3b2/0x8b0
[ 117.033011][ T68] ? net_passive_dec+0x190/0x190
[ 117.033015][ T68] ? rcu_is_watching+0x12/0xb0
[ 117.033028][ T68] process_one_work+0xe35/0x1650
[ 117.033039][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 117.033045][ T68] ? assign_work+0x168/0x240
[ 117.033049][ T68] worker_thread+0x591/0xcf0
[ 117.033055][ T68] ? rescuer_thread+0xd10/0xd10
[ 117.033059][ T68] kthread+0x37b/0x5f0
[ 117.033063][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 117.033066][ T68] ? ret_from_fork+0x1b/0x270
[ 117.033073][ T68] ? __lock_release+0x5d/0x170
[ 117.033078][ T68] ? rcu_is_watching+0x12/0xb0
[ 117.033083][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 117.033087][ T68] ret_from_fork+0x1db/0x270
[ 117.033089][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 117.033092][ T68] ret_from_fork_asm+0x11/0x20
[ 117.033103][ T68]
[ 117.033105][ T68]
[ 117.039227][ T68] Allocated by task 263:
[ 117.039348][ T68] kasan_save_stack+0x24/0x40
[ 117.039512][ T68] kasan_save_track+0x14/0x30
[ 117.039667][ T68] __kasan_kmalloc+0x7b/0x90
[ 117.039820][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 117.039980][ T68] alloc_netdev_mqs+0x7d/0x1370
[ 117.040146][ T68] ip6_tnl_init_net+0x102/0x3f0
[ 117.040305][ T68] ops_init+0x189/0x550
[ 117.040422][ T68] setup_net+0xf1/0x380
[ 117.040545][ T68] copy_net_ns+0x253/0x510
[ 117.040704][ T68] create_new_namespaces+0x35f/0x900
[ 117.040867][ T68] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 117.041028][ T68] ksys_unshare+0x2be/0x6e0
[ 117.041185][ T68] __x64_sys_unshare+0x31/0x40
[ 117.041344][ T68] do_syscall_64+0xc1/0xfd0
[ 117.041501][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 117.041697][ T68]
[ 117.041777][ T68] Freed by task 68:
[ 117.041893][ T68] kasan_save_stack+0x24/0x40
[ 117.042062][ T68] kasan_save_track+0x14/0x30
[ 117.042220][ T68] __kasan_save_free_info+0x3b/0x60
[ 117.042380][ T68] __kasan_slab_free+0x3f/0x60
[ 117.042631][ T68] kfree+0x21d/0x540
[ 117.042748][ T68] device_release+0x9c/0x210
[ 117.042909][ T68] kobject_cleanup+0xfe/0x360
[ 117.043075][ T68] netdev_run_todo+0x81f/0xc60
[ 117.043232][ T68] ops_undo_list+0x714/0x890
[ 117.043387][ T68] cleanup_net+0x3b2/0x8b0
[ 117.043718][ T68] process_one_work+0xe35/0x1650
[ 117.043877][ T68] worker_thread+0x591/0xcf0
[ 117.044039][ T68] kthread+0x37b/0x5f0
[ 117.044245][ T68] ret_from_fork+0x1db/0x270
[ 117.044399][ T68] ret_from_fork_asm+0x11/0x20
[ 117.044555][ T68]
[ 117.044633][ T68] The buggy address belongs to the object at ffff888008ba1000
[ 117.044633][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 117.045010][ T68] The buggy address is located 1732 bytes inside of
[ 117.045010][ T68] freed 4096-byte region [ffff888008ba1000, ffff888008ba2000)
[ 117.045405][ T68]
[ 117.045569][ T68] The buggy address belongs to the physical page:
[ 117.045852][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8ba0
[ 117.046240][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 117.046476][ T68] flags: 0x80000000000040(head|node=0|zone=1)
[ 117.046866][ T68] page_type: f5(slab)
[ 117.046996][ T68] raw: 0080000000000040 ffff888001043700 ffffea0000226010 ffffea000022f210
[ 117.047280][ T68] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 117.047661][ T68] head: 0080000000000040 ffff888001043700 ffffea0000226010 ffffea000022f210
[ 117.047944][ T68] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 117.048318][ T68] head: 0080000000000003 ffffea000022e801 00000000ffffffff 00000000ffffffff
[ 117.048591][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 117.048870][ T68] page dumped because: kasan: bad access detected
[ 117.049150][ T68]
[ 117.049228][ T68] Memory state around the buggy address:
[ 117.049379][ T68] ffff888008ba1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 117.049607][ T68] ffff888008ba1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 117.049830][ T68] >ffff888008ba1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 117.050066][ T68] ^
[ 117.050251][ T68] ffff888008ba1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 117.050474][ T68] ffff888008ba1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 117.050692][ T68] ==================================================================
[ 117.051148][ T68] Disabling lock debugging due to kernel taint
[ 117.051589][ T68] ------------[ cut here ]------------
[ 117.051741][ T68] refcount_t: underflow; use-after-free.
[ 117.051992][ T68] WARNING: CPU: 1 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 117.052289][ T68] Modules linked in:
[ 117.052418][ T68] CPU: 1 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 117.052776][ T68] Tainted: [B]=BAD_PAGE
[ 117.052895][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 117.053108][ T68] Workqueue: netns cleanup_net
[ 117.053288][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 117.053491][ T68] 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 b5 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
[ 117.054057][ T68] RSP: 0018:ffffc90000497a08 EFLAGS: 00010282
[ 117.054275][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 117.054513][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 117.054748][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6c40934
[ 117.054992][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 117.055240][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 117.055474][ T68] FS: 0000000000000000(0000) GS:ffff8880af588000(0000) knlGS:0000000000000000
[ 117.055749][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 117.055958][ T68] CR2: 00007efe63747000 CR3: 0000000072949006 CR4: 0000000000772ef0
[ 117.056206][ T68] PKRU: 55555554
[ 117.056325][ T68] Call Trace:
[ 117.056443][ T68]
[ 117.056526][ T68] netdev_run_todo+0x5f0/0xc60
[ 117.056687][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 117.056853][ T68] ? generic_xdp_install+0x410/0x410
[ 117.057020][ T68] ? net_generic+0xb1/0x1f0
[ 117.057185][ T68] ops_undo_list+0x714/0x890
[ 117.057365][ T68] ? rtnl_net_dumpid_one+0x270/0x270
[ 117.057522][ T68] ? cleanup_net+0x2d6/0x8b0
[ 117.057673][ T68] cleanup_net+0x3b2/0x8b0
[ 117.057824][ T68] ? net_passive_dec+0x190/0x190
[ 117.057989][ T68] ? rcu_is_watching+0x12/0xb0
[ 117.058155][ T68] process_one_work+0xe35/0x1650
[ 117.058328][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 117.058481][ T68] ? assign_work+0x168/0x240
[ 117.058632][ T68] worker_thread+0x591/0xcf0
[ 117.058784][ T68] ? rescuer_thread+0xd10/0xd10
[ 117.058938][ T68] kthread+0x37b/0x5f0
[ 117.059063][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 117.059225][ T68] ? ret_from_fork+0x1b/0x270
[ 117.059382][ T68] ? __lock_release+0x5d/0x170
[ 117.059534][ T68] ? rcu_is_watching+0x12/0xb0
[ 117.059685][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 117.059836][ T68] ret_from_fork+0x1db/0x270
[ 117.059994][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 117.060146][ T68] ret_from_fork_asm+0x11/0x20
[ 117.060320][ T68]
[ 117.060436][ T68] irq event stamp: 9321
[ 117.060556][ T68] hardirqs last enabled at (9321): [] finish_task_switch.isra.0+0x245/0x960
[ 117.060857][ T68] hardirqs last disabled at (9320): [] __schedule+0x94a/0x1b10
[ 117.061143][ T68] softirqs last enabled at (8256): [] unregister_netdevice_many_notify+0x714/0x1c90
[ 117.061454][ T68] softirqs last disabled at (8254): [] dev_mc_flush+0x54/0x90
[ 117.061719][ T68] ---[ end trace 0000000000000000 ]---