[ 593.777095][ T70] ==================================================================
[ 593.777578][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 593.778000][ T70] Read of size 1 at addr ffff888005b196c4 by task kworker/u16:1/70
[ 593.778394][ T70]
[ 593.778540][ T70] CPU: 1 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 593.778548][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 593.778556][ T70] Workqueue: netns cleanup_net
[ 593.778576][ T70] Call Trace:
[ 593.778583][ T70]
[ 593.778588][ T70] dump_stack_lvl+0x82/0xc0
[ 593.778601][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 593.778612][ T70] ? kobject_put+0xbb/0xd0
[ 593.778618][ T70] print_report+0xb4/0x270
[ 593.778624][ T70] ? kobject_put+0xbb/0xd0
[ 593.778629][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 593.778636][ T70] ? kobject_put+0xbb/0xd0
[ 593.778640][ T70] kasan_report+0xca/0x100
[ 593.778647][ T70] ? kobject_put+0xbb/0xd0
[ 593.778657][ T70] kobject_put+0xbb/0xd0
[ 593.778663][ T70] netdev_run_todo+0x5f0/0xc60
[ 593.778675][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 593.778681][ T70] ? generic_xdp_install+0x410/0x410
[ 593.778686][ T70] ? net_generic+0xb1/0x1f0
[ 593.778701][ T70] ops_undo_list+0x714/0x890
[ 593.778710][ T70] ? rtnl_net_dumpid_one+0x270/0x270
[ 593.778715][ T70] ? cleanup_net+0x2d6/0x8b0
[ 593.778726][ T70] cleanup_net+0x3b2/0x8b0
[ 593.778733][ T70] ? net_passive_dec+0x190/0x190
[ 593.778741][ T70] ? rcu_is_watching+0x12/0xb0
[ 593.778751][ T70] process_one_work+0xe35/0x1650
[ 593.778765][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 593.778775][ T70] ? assign_work+0x168/0x240
[ 593.778783][ T70] worker_thread+0x591/0xcf0
[ 593.778794][ T70] ? rescuer_thread+0xd10/0xd10
[ 593.778801][ T70] kthread+0x37b/0x5f0
[ 593.778807][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 593.778812][ T70] ? ret_from_fork+0x1b/0x270
[ 593.778818][ T70] ? __lock_release+0x5d/0x170
[ 593.778825][ T70] ? rcu_is_watching+0x12/0xb0
[ 593.778830][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 593.778837][ T70] ret_from_fork+0x1db/0x270
[ 593.778841][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 593.778846][ T70] ret_from_fork_asm+0x11/0x20
[ 593.778862][ T70]
[ 593.778864][ T70]
[ 593.786432][ T70] Allocated by task 258:
[ 593.786573][ T70] kasan_save_stack+0x24/0x40
[ 593.786761][ T70] kasan_save_track+0x14/0x30
[ 593.786936][ T70] __kasan_kmalloc+0x7b/0x90
[ 593.787108][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 593.787287][ T70] alloc_netdev_mqs+0x7d/0x1370
[ 593.787462][ T70] ip6_tnl_init_net+0x102/0x3f0
[ 593.787640][ T70] ops_init+0x189/0x550
[ 593.787772][ T70] setup_net+0xf1/0x380
[ 593.787906][ T70] copy_net_ns+0x253/0x510
[ 593.788079][ T70] create_new_namespaces+0x35f/0x900
[ 593.788258][ T70] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 593.788430][ T70] ksys_unshare+0x2be/0x6e0
[ 593.788605][ T70] __x64_sys_unshare+0x31/0x40
[ 593.788777][ T70] do_syscall_64+0xc1/0xfd0
[ 593.788947][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 593.789161][ T70]
[ 593.789259][ T70] Freed by task 70:
[ 593.789387][ T70] kasan_save_stack+0x24/0x40
[ 593.789566][ T70] kasan_save_track+0x14/0x30
[ 593.789742][ T70] __kasan_save_free_info+0x3b/0x60
[ 593.789921][ T70] __kasan_slab_free+0x3f/0x60
[ 593.790094][ T70] kfree+0x21d/0x540
[ 593.790222][ T70] device_release+0x9c/0x210
[ 593.790398][ T70] kobject_cleanup+0xfe/0x360
[ 593.790577][ T70] netdev_run_todo+0x81f/0xc60
[ 593.790752][ T70] ops_undo_list+0x714/0x890
[ 593.790925][ T70] cleanup_net+0x3b2/0x8b0
[ 593.791112][ T70] process_one_work+0xe35/0x1650
[ 593.791287][ T70] worker_thread+0x591/0xcf0
[ 593.791460][ T70] kthread+0x37b/0x5f0
[ 593.791595][ T70] ret_from_fork+0x1db/0x270
[ 593.791785][ T70] ret_from_fork_asm+0x11/0x20
[ 593.791958][ T70]
[ 593.792045][ T70] The buggy address belongs to the object at ffff888005b19000
[ 593.792045][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 593.792459][ T70] The buggy address is located 1732 bytes inside of
[ 593.792459][ T70] freed 4096-byte region [ffff888005b19000, ffff888005b1a000)
[ 593.792864][ T70]
[ 593.792949][ T70] The buggy address belongs to the physical page:
[ 593.793196][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b18
[ 593.793510][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 593.793765][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 593.794006][ T70] page_type: f5(slab)
[ 593.794208][ T70] raw: 0080000000000040 ffff888001043700 ffffea000020c410 ffffea0000227410
[ 593.794519][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 593.794826][ T70] head: 0080000000000040 ffff888001043700 ffffea000020c410 ffffea0000227410
[ 593.795169][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 593.795471][ T70] head: 0080000000000003 ffffea000016c601 00000000ffffffff 00000000ffffffff
[ 593.795769][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 593.796115][ T70] page dumped because: kasan: bad access detected
[ 593.796332][ T70]
[ 593.796416][ T70] Memory state around the buggy address:
[ 593.796586][ T70] ffff888005b19580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 593.796840][ T70] ffff888005b19600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 593.797121][ T70] >ffff888005b19680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 593.797374][ T70] ^
[ 593.797581][ T70] ffff888005b19700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 593.797837][ T70] ffff888005b19780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 593.798140][ T70] ==================================================================
[ 593.798629][ T70] Disabling lock debugging due to kernel taint
[ 593.798980][ T70] ------------[ cut here ]------------
[ 593.799181][ T70] refcount_t: underflow; use-after-free.
[ 593.799443][ T70] WARNING: CPU: 2 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 593.799873][ T70] Modules linked in:
[ 593.800066][ T70] CPU: 2 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 593.800566][ T70] Tainted: [B]=BAD_PAGE
[ 593.800749][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 593.801009][ T70] Workqueue: netns cleanup_net
[ 593.801242][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 593.801510][ T70] 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 92 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
[ 593.802252][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 593.802548][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 593.802855][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 593.803158][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2640934
[ 593.803486][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 593.803792][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 593.804079][ T70] FS: 0000000000000000(0000) GS:ffff8880d8a08000(0000) knlGS:0000000000000000
[ 593.804431][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 593.804724][ T70] CR2: 00007f50fcc120fa CR3: 0000000013f49002 CR4: 0000000000772ef0
[ 593.805029][ T70] PKRU: 55555554
[ 593.805204][ T70] Call Trace:
[ 593.805380][ T70]
[ 593.805506][ T70] netdev_run_todo+0x5f0/0xc60
[ 593.805751][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 593.805996][ T70] ? generic_xdp_install+0x410/0x410
[ 593.806213][ T70] ? net_generic+0xb1/0x1f0
[ 593.806425][ T70] ops_undo_list+0x714/0x890
[ 593.806639][ T70] ? rtnl_net_dumpid_one+0x270/0x270
[ 593.806835][ T70] ? cleanup_net+0x2d6/0x8b0
[ 593.807045][ T70] cleanup_net+0x3b2/0x8b0
[ 593.807247][ T70] ? net_passive_dec+0x190/0x190
[ 593.807449][ T70] ? rcu_is_watching+0x12/0xb0
[ 593.807665][ T70] process_one_work+0xe35/0x1650
[ 593.807870][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 593.808073][ T70] ? assign_work+0x168/0x240
[ 593.808302][ T70] worker_thread+0x591/0xcf0
[ 593.808529][ T70] ? rescuer_thread+0xd10/0xd10
[ 593.808742][ T70] kthread+0x37b/0x5f0
[ 593.808909][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 593.809127][ T70] ? ret_from_fork+0x1b/0x270
[ 593.809337][ T70] ? __lock_release+0x5d/0x170
[ 593.809568][ T70] ? rcu_is_watching+0x12/0xb0
[ 593.809783][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 593.810000][ T70] ret_from_fork+0x1db/0x270
[ 593.810213][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 593.810415][ T70] ret_from_fork_asm+0x11/0x20
[ 593.810632][ T70]
[ 593.810791][ T70] irq event stamp: 10073
[ 593.810968][ T70] hardirqs last enabled at (10073): [] finish_task_switch.isra.0+0x245/0x960
[ 593.811360][ T70] hardirqs last disabled at (10072): [] __schedule+0x94a/0x1b10
[ 593.811731][ T70] softirqs last enabled at (9780): [] handle_softirqs+0x352/0x610
[ 593.812084][ T70] softirqs last disabled at (9773): [] irq_exit_rcu+0xab/0x100
[ 593.812426][ T70] ---[ end trace 0000000000000000 ]---