[ 65.271392][ T12] ==================================================================
[ 65.271786][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 65.272160][ T12] Read of size 1 at addr ffff88800e8dc69c by task kworker/u16:0/12
[ 65.272522][ T12]
[ 65.272650][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 65.272657][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 65.272661][ T12] Workqueue: netns cleanup_net
[ 65.272671][ T12] Call Trace:
[ 65.272674][ T12]
[ 65.272677][ T12] dump_stack_lvl+0x82/0xc0
[ 65.272685][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 65.272694][ T12] ? kobject_put+0xbb/0xd0
[ 65.272699][ T12] print_report+0xb4/0x270
[ 65.272704][ T12] ? kobject_put+0xbb/0xd0
[ 65.272707][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 65.272713][ T12] ? kobject_put+0xbb/0xd0
[ 65.272718][ T12] kasan_report+0xca/0x100
[ 65.272724][ T12] ? kobject_put+0xbb/0xd0
[ 65.272734][ T12] kobject_put+0xbb/0xd0
[ 65.272740][ T12] netdev_run_todo+0x5f0/0xc60
[ 65.272747][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 65.272753][ T12] ? generic_xdp_install+0x410/0x410
[ 65.272764][ T12] ops_undo_list+0x714/0x890
[ 65.272773][ T12] ? netns_get+0x110/0x110
[ 65.272778][ T12] ? cleanup_net+0x2d6/0x830
[ 65.272788][ T12] cleanup_net+0x3b2/0x830
[ 65.272794][ T12] ? net_passive_dec+0x190/0x190
[ 65.272802][ T12] ? rcu_is_watching+0x12/0xb0
[ 65.272811][ T12] process_one_work+0xe35/0x1650
[ 65.272824][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 65.272835][ T12] ? assign_work+0x168/0x240
[ 65.272843][ T12] worker_thread+0x591/0xcf0
[ 65.272853][ T12] ? rescuer_thread+0xd10/0xd10
[ 65.272860][ T12] kthread+0x37b/0x5f0
[ 65.272866][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 65.272871][ T12] ? ret_from_fork+0x1b/0x270
[ 65.272876][ T12] ? __lock_release+0x5d/0x170
[ 65.272883][ T12] ? rcu_is_watching+0x12/0xb0
[ 65.272889][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 65.272896][ T12] ret_from_fork+0x1db/0x270
[ 65.272900][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 65.272905][ T12] ret_from_fork_asm+0x11/0x20
[ 65.272921][ T12]
[ 65.272923][ T12]
[ 65.282253][ T12] Allocated by task 245:
[ 65.282446][ T12] kasan_save_stack+0x24/0x40
[ 65.282694][ T12] kasan_save_track+0x14/0x30
[ 65.282946][ T12] __kasan_kmalloc+0x7b/0x90
[ 65.283198][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 65.283438][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 65.283683][ T12] sit_init_net+0x169/0x550
[ 65.283926][ T12] ops_init+0x189/0x550
[ 65.284126][ T12] setup_net+0xf1/0x380
[ 65.284320][ T12] copy_net_ns+0x21a/0x380
[ 65.284558][ T12] create_new_namespaces+0x35f/0x900
[ 65.284803][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 65.285050][ T12] ksys_unshare+0x2a3/0x660
[ 65.285296][ T12] __x64_sys_unshare+0x31/0x40
[ 65.285544][ T12] do_syscall_64+0xc1/0xfd0
[ 65.285781][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 65.286091][ T12]
[ 65.286214][ T12] Freed by task 12:
[ 65.286394][ T12] kasan_save_stack+0x24/0x40
[ 65.286646][ T12] kasan_save_track+0x14/0x30
[ 65.286897][ T12] __kasan_save_free_info+0x3b/0x60
[ 65.287152][ T12] __kasan_slab_free+0x3f/0x60
[ 65.287575][ T12] kfree+0x21d/0x540
[ 65.287771][ T12] device_release+0x9c/0x210
[ 65.288024][ T12] kobject_cleanup+0xfe/0x360
[ 65.288283][ T12] netdev_run_todo+0x81f/0xc60
[ 65.288700][ T12] ops_undo_list+0x714/0x890
[ 65.288955][ T12] cleanup_net+0x3b2/0x830
[ 65.289206][ T12] process_one_work+0xe35/0x1650
[ 65.289460][ T12] worker_thread+0x591/0xcf0
[ 65.289874][ T12] kthread+0x37b/0x5f0
[ 65.290061][ T12] ret_from_fork+0x1db/0x270
[ 65.290324][ T12] ret_from_fork_asm+0x11/0x20
[ 65.290579][ T12]
[ 65.290705][ T12] The buggy address belongs to the object at ffff88800e8dc000
[ 65.290705][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 65.291470][ T12] The buggy address is located 1692 bytes inside of
[ 65.291470][ T12] freed 4096-byte region [ffff88800e8dc000, ffff88800e8dd000)
[ 65.292240][ T12]
[ 65.292368][ T12] The buggy address belongs to the physical page:
[ 65.292672][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe8d8
[ 65.293289][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 65.293673][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 65.294001][ T12] page_type: f5(slab)
[ 65.294210][ T12] raw: 0080000000000040 ffff888001043700 ffffea00003a7810 ffffea0000166610
[ 65.294824][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 65.295278][ T12] head: 0080000000000040 ffff888001043700 ffffea00003a7810 ffffea0000166610
[ 65.295909][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 65.296361][ T12] head: 0080000000000003 ffffea00003a3601 00000000ffffffff 00000000ffffffff
[ 65.296967][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 65.297432][ T12] page dumped because: kasan: bad access detected
[ 65.297754][ T12]
[ 65.298041][ T12] Memory state around the buggy address:
[ 65.298290][ T12] ffff88800e8dc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 65.298666][ T12] ffff88800e8dc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 65.299185][ T12] >ffff88800e8dc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 65.299555][ T12] ^
[ 65.299795][ T12] ffff88800e8dc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 65.300311][ T12] ffff88800e8dc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 65.300680][ T12] ==================================================================
[ 65.301211][ T12] Disabling lock debugging due to kernel taint
[ 65.301448][ T12] ------------[ cut here ]------------
[ 65.301835][ T12] refcount_t: underflow; use-after-free.
[ 65.302032][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 65.302326][ T12] Modules linked in: xt_mark nft_compat nf_tables
[ 65.302564][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 65.302937][ T12] Tainted: [B]=BAD_PAGE
[ 65.303073][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 65.303285][ T12] Workqueue: netns cleanup_net
[ 65.303468][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 65.303697][ T12] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d 25 87 e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 65.304267][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 65.304489][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 65.304739][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 65.304994][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0f82934
[ 65.305240][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 65.305493][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 65.305747][ T12] FS: 0000000000000000(0000) GS:ffff8880ad284000(0000) knlGS:0000000000000000
[ 65.306034][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 65.306245][ T12] CR2: 00007f94e3e49000 CR3: 000000000bf59004 CR4: 0000000000772ef0
[ 65.306497][ T12] PKRU: 55555554
[ 65.306640][ T12] Call Trace:
[ 65.306776][ T12]
[ 65.306875][ T12] netdev_run_todo+0x5f0/0xc60
[ 65.307050][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 65.307230][ T12] ? generic_xdp_install+0x410/0x410
[ 65.307407][ T12] ops_undo_list+0x714/0x890
[ 65.307588][ T12] ? netns_get+0x110/0x110
[ 65.307761][ T12] ? cleanup_net+0x2d6/0x830
[ 65.307936][ T12] cleanup_net+0x3b2/0x830
[ 65.308108][ T12] ? net_passive_dec+0x190/0x190
[ 65.308280][ T12] ? rcu_is_watching+0x12/0xb0
[ 65.308461][ T12] process_one_work+0xe35/0x1650
[ 65.308832][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 65.309008][ T12] ? assign_work+0x168/0x240
[ 65.309181][ T12] worker_thread+0x591/0xcf0
[ 65.309354][ T12] ? rescuer_thread+0xd10/0xd10
[ 65.309538][ T12] kthread+0x37b/0x5f0
[ 65.309767][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 65.309940][ T12] ? ret_from_fork+0x1b/0x270
[ 65.310110][ T12] ? __lock_release+0x5d/0x170
[ 65.310289][ T12] ? rcu_is_watching+0x12/0xb0
[ 65.310461][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 65.310730][ T12] ret_from_fork+0x1db/0x270
[ 65.310903][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 65.311073][ T12] ret_from_fork_asm+0x11/0x20
[ 65.311251][ T12]
[ 65.311387][ T12] irq event stamp: 10341
[ 65.311529][ T12] hardirqs last enabled at (10341): [] finish_task_switch.isra.0+0x245/0x960
[ 65.311942][ T12] hardirqs last disabled at (10340): [] __schedule+0x94a/0x1b10
[ 65.312231][ T12] softirqs last enabled at (9944): [] handle_softirqs+0x352/0x610
[ 65.312606][ T12] softirqs last disabled at (9663): [] irq_exit_rcu+0xab/0x100
[ 65.312972][ T12] ---[ end trace 0000000000000000 ]---