[ 16.232580][ T12] ==================================================================
[ 16.232912][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.233296][ T12] Read of size 1 at addr ffff888004b39694 by task kworker/u16:0/12
[ 16.233699][ T12]
[ 16.233842][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.233851][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.233856][ T12] Workqueue: netns cleanup_net
[ 16.233867][ T12] Call Trace:
[ 16.233870][ T12]
[ 16.233874][ T12] dump_stack_lvl+0x82/0xc0
[ 16.233883][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.233895][ T12] ? kobject_put+0xbb/0xd0
[ 16.233902][ T12] print_report+0xb4/0x270
[ 16.233908][ T12] ? kobject_put+0xbb/0xd0
[ 16.233913][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.233919][ T12] ? kobject_put+0xbb/0xd0
[ 16.233924][ T12] kasan_report+0xca/0x100
[ 16.233931][ T12] ? kobject_put+0xbb/0xd0
[ 16.233941][ T12] kobject_put+0xbb/0xd0
[ 16.233946][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.233954][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.233959][ T12] ? generic_xdp_install+0x410/0x410
[ 16.233970][ T12] ops_undo_list+0x714/0x890
[ 16.233977][ T12] ? netns_get+0x110/0x110
[ 16.233981][ T12] ? cleanup_net+0x2d6/0x830
[ 16.233991][ T12] cleanup_net+0x3b2/0x830
[ 16.233997][ T12] ? net_passive_dec+0x190/0x190
[ 16.234004][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.234014][ T12] process_one_work+0xe35/0x1650
[ 16.234028][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.234038][ T12] ? assign_work+0x168/0x240
[ 16.234045][ T12] worker_thread+0x591/0xcf0
[ 16.234056][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.234062][ T12] kthread+0x37b/0x5f0
[ 16.234068][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.234073][ T12] ? ret_from_fork+0x1b/0x270
[ 16.234080][ T12] ? __lock_release+0x5d/0x170
[ 16.234088][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.234094][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.234100][ T12] ret_from_fork+0x1db/0x270
[ 16.234105][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.234110][ T12] ret_from_fork_asm+0x11/0x20
[ 16.234126][ T12]
[ 16.234128][ T12]
[ 16.244149][ T12] Allocated by task 228:
[ 16.244364][ T12] kasan_save_stack+0x24/0x40
[ 16.244642][ T12] kasan_save_track+0x14/0x30
[ 16.244905][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.245182][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.245450][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.245707][ T12] sit_init_net+0x169/0x550
[ 16.245972][ T12] ops_init+0x189/0x550
[ 16.246187][ T12] setup_net+0xf1/0x380
[ 16.246394][ T12] copy_net_ns+0x21a/0x380
[ 16.246662][ T12] create_new_namespaces+0x35f/0x900
[ 16.246939][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.247204][ T12] ksys_unshare+0x2a3/0x660
[ 16.247480][ T12] __x64_sys_unshare+0x31/0x40
[ 16.247753][ T12] do_syscall_64+0xc1/0xfd0
[ 16.248014][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.248340][ T12]
[ 16.248475][ T12] Freed by task 12:
[ 16.248682][ T12] kasan_save_stack+0x24/0x40
[ 16.248951][ T12] kasan_save_track+0x14/0x30
[ 16.249216][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.249487][ T12] __kasan_slab_free+0x3f/0x60
[ 16.249757][ T12] kfree+0x21d/0x540
[ 16.249959][ T12] device_release+0x9c/0x210
[ 16.250232][ T12] kobject_cleanup+0xfe/0x360
[ 16.250505][ T12] netdev_run_todo+0x81f/0xc60
[ 16.250779][ T12] ops_undo_list+0x714/0x890
[ 16.251037][ T12] cleanup_net+0x3b2/0x830
[ 16.251304][ T12] process_one_work+0xe35/0x1650
[ 16.251571][ T12] worker_thread+0x591/0xcf0
[ 16.251826][ T12] kthread+0x37b/0x5f0
[ 16.252016][ T12] ret_from_fork+0x1db/0x270
[ 16.252259][ T12] ret_from_fork_asm+0x11/0x20
[ 16.252511][ T12]
[ 16.252786][ T12] The buggy address belongs to the object at ffff888004b39000
[ 16.252786][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.253398][ T12] The buggy address is located 1684 bytes inside of
[ 16.253398][ T12] freed 4096-byte region [ffff888004b39000, ffff888004b3a000)
[ 16.254178][ T12]
[ 16.254300][ T12] The buggy address belongs to the physical page:
[ 16.254597][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4b38
[ 16.255208][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.255600][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.255914][ T12] page_type: f5(slab)
[ 16.256246][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000221410 ffffea0000237410
[ 16.256897][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.257378][ T12] head: 0080000000000040 ffff888001043700 ffffea0000221410 ffffea0000237410
[ 16.257835][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.258279][ T12] head: 0080000000000003 ffffea000012ce01 00000000ffffffff 00000000ffffffff
[ 16.258889][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.259319][ T12] page dumped because: kasan: bad access detected
[ 16.259633][ T12]
[ 16.259760][ T12] Memory state around the buggy address:
[ 16.260013][ T12] ffff888004b39580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.260379][ T12] ffff888004b39600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.260879][ T12] >ffff888004b39680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.261272][ T12] ^
[ 16.261513][ T12] ffff888004b39700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.261865][ T12] ffff888004b39780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.262245][ T12] ==================================================================
[ 16.263635][ T12] Disabling lock debugging due to kernel taint
[ 16.263914][ T12] ------------[ cut here ]------------
[ 16.264106][ T12] refcount_t: underflow; use-after-free.
[ 16.264342][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.264710][ T12] Modules linked in: veth
[ 16.264880][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.265312][ T12] Tainted: [B]=BAD_PAGE
[ 16.265483][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.265733][ T12] Workqueue: netns cleanup_net
[ 16.265937][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.266205][ 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 8d 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
[ 16.266870][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.267118][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.267415][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.267726][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1c3e134
[ 16.268004][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.268300][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.268699][ T12] FS: 0000000000000000(0000) GS:ffff8880a6d10000(0000) knlGS:0000000000000000
[ 16.269027][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.269414][ T12] CR2: 00007fcd2ae47760 CR3: 00000000098af002 CR4: 0000000000772ef0
[ 16.269785][ T12] PKRU: 55555554
[ 16.269924][ T12] Call Trace:
[ 16.270077][ T12]
[ 16.270197][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.270513][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.270738][ T12] ? generic_xdp_install+0x410/0x410
[ 16.270925][ T12] ops_undo_list+0x714/0x890
[ 16.271139][ T12] ? netns_get+0x110/0x110
[ 16.271467][ T12] ? cleanup_net+0x2d6/0x830
[ 16.271679][ T12] cleanup_net+0x3b2/0x830
[ 16.271866][ T12] ? net_passive_dec+0x190/0x190
[ 16.272066][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.272370][ T12] process_one_work+0xe35/0x1650
[ 16.272602][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.272801][ T12] ? assign_work+0x168/0x240
[ 16.272986][ T12] worker_thread+0x591/0xcf0
[ 16.273294][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.273498][ T12] kthread+0x37b/0x5f0
[ 16.273659][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.273849][ T12] ? ret_from_fork+0x1b/0x270
[ 16.274128][ T12] ? __lock_release+0x5d/0x170
[ 16.274338][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.274547][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.274758][ T12] ret_from_fork+0x1db/0x270
[ 16.275040][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.275237][ T12] ret_from_fork_asm+0x11/0x20
[ 16.275443][ T12]
[ 16.275614][ T12] irq event stamp: 2669
[ 16.275768][ T12] hardirqs last enabled at (2669): [] finish_task_switch.isra.0+0x245/0x960
[ 16.276232][ T12] hardirqs last disabled at (2668): [] __schedule+0x94a/0x1b10
[ 16.276570][ T12] softirqs last enabled at (2040): [] handle_softirqs+0x352/0x610
[ 16.276996][ T12] softirqs last disabled at (2033): [] irq_exit_rcu+0xab/0x100
[ 16.277328][ T12] ---[ end trace 0000000000000000 ]---