[ 17.549756][ T260] ip (260) used greatest stack depth: 24512 bytes left
[ 19.021985][ T268] ip (268) used greatest stack depth: 24256 bytes left
[ 156.242878][ T12] ==================================================================
[ 156.243155][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 156.243396][ T12] Read of size 1 at addr ffff8880085316ac by task kworker/u16:0/12
[ 156.243628][ T12]
[ 156.243709][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 156.243714][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 156.243717][ T12] Workqueue: netns cleanup_net
[ 156.243724][ T12] Call Trace:
[ 156.243726][ T12]
[ 156.243729][ T12] dump_stack_lvl+0x82/0xc0
[ 156.243734][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 156.243744][ T12] ? kobject_put+0xbb/0xd0
[ 156.243748][ T12] print_report+0xb4/0x270
[ 156.243751][ T12] ? kobject_put+0xbb/0xd0
[ 156.243755][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 156.243758][ T12] ? kobject_put+0xbb/0xd0
[ 156.243762][ T12] kasan_report+0xca/0x100
[ 156.243766][ T12] ? kobject_put+0xbb/0xd0
[ 156.243772][ T12] kobject_put+0xbb/0xd0
[ 156.243776][ T12] netdev_run_todo+0x5f0/0xc60
[ 156.243781][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 156.243785][ T12] ? generic_xdp_install+0x410/0x410
[ 156.243793][ T12] ops_undo_list+0x714/0x890
[ 156.243801][ T12] ? netns_get+0x110/0x110
[ 156.243804][ T12] ? cleanup_net+0x2d6/0x830
[ 156.243809][ T12] cleanup_net+0x3b2/0x830
[ 156.243813][ T12] ? net_passive_dec+0x190/0x190
[ 156.243817][ T12] ? rcu_is_watching+0x12/0xb0
[ 156.243824][ T12] process_one_work+0xe35/0x1650
[ 156.243833][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 156.243839][ T12] ? assign_work+0x168/0x240
[ 156.243842][ T12] worker_thread+0x591/0xcf0
[ 156.243848][ T12] ? rescuer_thread+0xd10/0xd10
[ 156.243852][ T12] kthread+0x37b/0x5f0
[ 156.243857][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 156.243859][ T12] ? ret_from_fork+0x1b/0x270
[ 156.243866][ T12] ? __lock_release+0x5d/0x170
[ 156.243873][ T12] ? rcu_is_watching+0x12/0xb0
[ 156.243876][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 156.243879][ T12] ret_from_fork+0x1db/0x270
[ 156.243883][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 156.243885][ T12] ret_from_fork_asm+0x11/0x20
[ 156.243894][ T12]
[ 156.243895][ T12]
[ 156.249823][ T12] Allocated by task 254:
[ 156.249942][ T12] kasan_save_stack+0x24/0x40
[ 156.250109][ T12] kasan_save_track+0x14/0x30
[ 156.250266][ T12] __kasan_kmalloc+0x7b/0x90
[ 156.250418][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 156.250597][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 156.250761][ T12] sit_init_net+0x169/0x550
[ 156.250922][ T12] ops_init+0x189/0x550
[ 156.251046][ T12] setup_net+0xf1/0x380
[ 156.251167][ T12] copy_net_ns+0x21a/0x380
[ 156.251328][ T12] create_new_namespaces+0x35f/0x900
[ 156.251486][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 156.251654][ T12] ksys_unshare+0x2a3/0x660
[ 156.251813][ T12] __x64_sys_unshare+0x31/0x40
[ 156.251967][ T12] do_syscall_64+0xc1/0xfd0
[ 156.252126][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 156.252315][ T12]
[ 156.252396][ T12] Freed by task 12:
[ 156.252518][ T12] kasan_save_stack+0x24/0x40
[ 156.252679][ T12] kasan_save_track+0x14/0x30
[ 156.252841][ T12] __kasan_save_free_info+0x3b/0x60
[ 156.252995][ T12] __kasan_slab_free+0x3f/0x60
[ 156.253158][ T12] kfree+0x21d/0x540
[ 156.253276][ T12] device_release+0x9c/0x210
[ 156.253433][ T12] kobject_cleanup+0xfe/0x360
[ 156.253596][ T12] netdev_run_todo+0x81f/0xc60
[ 156.253752][ T12] ops_undo_list+0x714/0x890
[ 156.253907][ T12] cleanup_net+0x3b2/0x830
[ 156.254069][ T12] process_one_work+0xe35/0x1650
[ 156.254226][ T12] worker_thread+0x591/0xcf0
[ 156.254381][ T12] kthread+0x37b/0x5f0
[ 156.254496][ T12] ret_from_fork+0x1db/0x270
[ 156.254657][ T12] ret_from_fork_asm+0x11/0x20
[ 156.254810][ T12]
[ 156.254892][ T12] The buggy address belongs to the object at ffff888008531000
[ 156.254892][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 156.255270][ T12] The buggy address is located 1708 bytes inside of
[ 156.255270][ T12] freed 4096-byte region [ffff888008531000, ffff888008532000)
[ 156.255650][ T12]
[ 156.255736][ T12] The buggy address belongs to the physical page:
[ 156.255926][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8530
[ 156.256207][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 156.256457][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 156.256673][ T12] page_type: f5(slab)
[ 156.256798][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000219210 ffffea00001df810
[ 156.257079][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 156.257381][ T12] head: 0080000000000040 ffff888001043700 ffffea0000219210 ffffea00001df810
[ 156.257671][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 156.257958][ T12] head: 0080000000000003 ffffea0000214c01 00000000ffffffff 00000000ffffffff
[ 156.258255][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 156.258530][ T12] page dumped because: kasan: bad access detected
[ 156.258735][ T12]
[ 156.258814][ T12] Memory state around the buggy address:
[ 156.258972][ T12] ffff888008531580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 156.259204][ T12] ffff888008531600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 156.259431][ T12] >ffff888008531680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 156.259665][ T12] ^
[ 156.259835][ T12] ffff888008531700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 156.260067][ T12] ffff888008531780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 156.260292][ T12] ==================================================================
[ 156.260826][ T12] Disabling lock debugging due to kernel taint
[ 156.261099][ T12] ------------[ cut here ]------------
[ 156.261302][ T12] refcount_t: underflow; use-after-free.
[ 156.261483][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 156.261765][ T12] Modules linked in: nft_ct nf_conntrack_netlink nft_redir nft_masq tcp_diag inet_diag nft_nat nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 156.262286][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 156.262640][ T12] Tainted: [B]=BAD_PAGE
[ 156.262755][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 156.262945][ T12] Workqueue: netns cleanup_net
[ 156.263111][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 156.263323][ 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 05 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
[ 156.263867][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 156.264065][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 156.264310][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 156.264537][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff193e220
[ 156.264774][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 156.265002][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 156.265241][ T12] FS: 0000000000000000(0000) GS:ffff8880a846c000(0000) knlGS:0000000000000000
[ 156.265507][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.265709][ T12] CR2: 00007faa95b120fa CR3: 000000001ad35002 CR4: 0000000000772ef0
[ 156.265934][ T12] PKRU: 55555554
[ 156.266053][ T12] Call Trace:
[ 156.266167][ T12]
[ 156.266321][ T12] netdev_run_todo+0x5f0/0xc60
[ 156.266484][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 156.266646][ T12] ? generic_xdp_install+0x410/0x410
[ 156.266799][ T12] ops_undo_list+0x714/0x890
[ 156.266954][ T12] ? netns_get+0x110/0x110
[ 156.267105][ T12] ? cleanup_net+0x2d6/0x830
[ 156.267324][ T12] cleanup_net+0x3b2/0x830
[ 156.267473][ T12] ? net_passive_dec+0x190/0x190
[ 156.267634][ T12] ? rcu_is_watching+0x12/0xb0
[ 156.267792][ T12] process_one_work+0xe35/0x1650
[ 156.267948][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 156.268105][ T12] ? assign_work+0x168/0x240
[ 156.268322][ T12] worker_thread+0x591/0xcf0
[ 156.268475][ T12] ? rescuer_thread+0xd10/0xd10
[ 156.268631][ T12] kthread+0x37b/0x5f0
[ 156.268745][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 156.268893][ T12] ? ret_from_fork+0x1b/0x270
[ 156.269053][ T12] ? __lock_release+0x5d/0x170
[ 156.269237][ T12] ? rcu_is_watching+0x12/0xb0
[ 156.269387][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 156.269534][ T12] ret_from_fork+0x1db/0x270
[ 156.269696][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 156.269847][ T12] ret_from_fork_asm+0x11/0x20
[ 156.270000][ T12]
[ 156.270115][ T12] irq event stamp: 6569
[ 156.270240][ T12] hardirqs last enabled at (6569): [] finish_task_switch.isra.0+0x245/0x960
[ 156.270554][ T12] hardirqs last disabled at (6568): [] __schedule+0x94a/0x1b10
[ 156.270828][ T12] softirqs last enabled at (5590): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 156.271124][ T12] softirqs last disabled at (5588): [] dev_mc_flush+0x54/0x90
[ 156.271394][ T12] ---[ end trace 0000000000000000 ]---