[ 17.496868][ T272] ip (272) used greatest stack depth: 23904 bytes left
[ 21.245998][ T12] ==================================================================
[ 21.246283][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 21.246609][ T12] Read of size 1 at addr ffff888007c416c4 by task kworker/u16:0/12
[ 21.246861][ T12]
[ 21.246950][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.246955][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.246957][ T12] Workqueue: netns cleanup_net
[ 21.246967][ T12] Call Trace:
[ 21.246969][ T12]
[ 21.246972][ T12] dump_stack_lvl+0x82/0xc0
[ 21.246978][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 21.246987][ T12] ? kobject_put+0xbb/0xd0
[ 21.246991][ T12] print_report+0xb4/0x270
[ 21.246994][ T12] ? kobject_put+0xbb/0xd0
[ 21.246997][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 21.247000][ T12] ? kobject_put+0xbb/0xd0
[ 21.247003][ T12] kasan_report+0xca/0x100
[ 21.247008][ T12] ? kobject_put+0xbb/0xd0
[ 21.247013][ T12] kobject_put+0xbb/0xd0
[ 21.247016][ T12] netdev_run_todo+0x5f0/0xc60
[ 21.247023][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 21.247027][ T12] ? generic_xdp_install+0x410/0x410
[ 21.247030][ T12] ? net_generic+0xb1/0x1f0
[ 21.247039][ T12] ops_undo_list+0x714/0x890
[ 21.247045][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.247048][ T12] ? cleanup_net+0x2d6/0x8b0
[ 21.247054][ T12] cleanup_net+0x3b2/0x8b0
[ 21.247058][ T12] ? net_passive_dec+0x190/0x190
[ 21.247063][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.247072][ T12] process_one_work+0xe35/0x1650
[ 21.247083][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.247088][ T12] ? assign_work+0x168/0x240
[ 21.247093][ T12] worker_thread+0x591/0xcf0
[ 21.247098][ T12] ? rescuer_thread+0xd10/0xd10
[ 21.247102][ T12] kthread+0x37b/0x5f0
[ 21.247106][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.247109][ T12] ? ret_from_fork+0x1b/0x270
[ 21.247115][ T12] ? __lock_release+0x5d/0x170
[ 21.247120][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.247123][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.247127][ T12] ret_from_fork+0x1db/0x270
[ 21.247130][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.247133][ T12] ret_from_fork_asm+0x11/0x20
[ 21.247144][ T12]
[ 21.247146][ T12]
[ 21.253946][ T12] Allocated by task 266:
[ 21.254085][ T12] kasan_save_stack+0x24/0x40
[ 21.254303][ T12] kasan_save_track+0x14/0x30
[ 21.254538][ T12] __kasan_kmalloc+0x7b/0x90
[ 21.254701][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 21.254862][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 21.255080][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 21.255262][ T12] ops_init+0x189/0x550
[ 21.255394][ T12] setup_net+0xf1/0x380
[ 21.255551][ T12] copy_net_ns+0x253/0x510
[ 21.255754][ T12] create_new_namespaces+0x35f/0x900
[ 21.255922][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 21.256079][ T12] ksys_unshare+0x2be/0x6e0
[ 21.256309][ T12] __x64_sys_unshare+0x31/0x40
[ 21.256491][ T12] do_syscall_64+0xc1/0xfd0
[ 21.256649][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.256851][ T12]
[ 21.256958][ T12] Freed by task 12:
[ 21.257124][ T12] kasan_save_stack+0x24/0x40
[ 21.257292][ T12] kasan_save_track+0x14/0x30
[ 21.257455][ T12] __kasan_save_free_info+0x3b/0x60
[ 21.257716][ T12] __kasan_slab_free+0x3f/0x60
[ 21.257958][ T12] kfree+0x21d/0x540
[ 21.258076][ T12] device_release+0x9c/0x210
[ 21.258233][ T12] kobject_cleanup+0xfe/0x360
[ 21.258422][ T12] netdev_run_todo+0x81f/0xc60
[ 21.258635][ T12] ops_undo_list+0x714/0x890
[ 21.258791][ T12] cleanup_net+0x3b2/0x8b0
[ 21.258948][ T12] process_one_work+0xe35/0x1650
[ 21.259103][ T12] worker_thread+0x591/0xcf0
[ 21.259256][ T12] kthread+0x37b/0x5f0
[ 21.259372][ T12] ret_from_fork+0x1db/0x270
[ 21.259580][ T12] ret_from_fork_asm+0x11/0x20
[ 21.259777][ T12]
[ 21.259863][ T12] The buggy address belongs to the object at ffff888007c41000
[ 21.259863][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 21.260313][ T12] The buggy address is located 1732 bytes inside of
[ 21.260313][ T12] freed 4096-byte region [ffff888007c41000, ffff888007c42000)
[ 21.260785][ T12]
[ 21.260870][ T12] The buggy address belongs to the physical page:
[ 21.261136][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c40
[ 21.261479][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 21.261883][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 21.262233][ T12] page_type: f5(slab)
[ 21.262440][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000205410 ffffea0000226610
[ 21.262880][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.263229][ T12] head: 0080000000000040 ffff888001043700 ffffea0000205410 ffffea0000226610
[ 21.263550][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.263908][ T12] head: 0080000000000003 ffffea00001f1001 00000000ffffffff 00000000ffffffff
[ 21.264192][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.264531][ T12] page dumped because: kasan: bad access detected
[ 21.264778][ T12]
[ 21.264859][ T12] Memory state around the buggy address:
[ 21.265020][ T12] ffff888007c41580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.265254][ T12] ffff888007c41600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.265570][ T12] >ffff888007c41680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.265807][ T12] ^
[ 21.266067][ T12] ffff888007c41700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.266286][ T12] ffff888007c41780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.266537][ T12] ==================================================================
[ 21.266939][ T12] Disabling lock debugging due to kernel taint
[ 21.267269][ T12] ------------[ cut here ]------------
[ 21.267652][ T12] refcount_t: underflow; use-after-free.
[ 21.267941][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.268383][ T12] Modules linked in:
[ 21.268582][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.269171][ T12] Tainted: [B]=BAD_PAGE
[ 21.269371][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.269698][ T12] Workqueue: netns cleanup_net
[ 21.269972][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.270304][ T12] 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 a5 ad 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
[ 21.271178][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 21.271488][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.271869][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.272280][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5d40934
[ 21.272653][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 21.273033][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.273397][ T12] FS: 0000000000000000(0000) GS:ffff8880bd288000(0000) knlGS:0000000000000000
[ 21.273855][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.274175][ T12] CR2: 0000556bdbd18dec CR3: 000000000ae75006 CR4: 0000000000772ef0
[ 21.274545][ T12] PKRU: 55555554
[ 21.274739][ T12] Call Trace:
[ 21.274919][ T12]
[ 21.275050][ T12] netdev_run_todo+0x5f0/0xc60
[ 21.275318][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 21.275587][ T12] ? generic_xdp_install+0x410/0x410
[ 21.275825][ T12] ? net_generic+0xb1/0x1f0
[ 21.276083][ T12] ops_undo_list+0x714/0x890
[ 21.276340][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.276589][ T12] ? cleanup_net+0x2d6/0x8b0
[ 21.277003][ T12] cleanup_net+0x3b2/0x8b0
[ 21.277412][ T12] ? net_passive_dec+0x190/0x190
[ 21.277664][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.277928][ T12] process_one_work+0xe35/0x1650
[ 21.278183][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.278589][ T12] ? assign_work+0x168/0x240
[ 21.278994][ T12] worker_thread+0x591/0xcf0
[ 21.279247][ T12] ? rescuer_thread+0xd10/0xd10
[ 21.279495][ T12] kthread+0x37b/0x5f0
[ 21.279692][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.279936][ T12] ? ret_from_fork+0x1b/0x270
[ 21.280186][ T12] ? __lock_release+0x5d/0x170
[ 21.280432][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.280693][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.280939][ T12] ret_from_fork+0x1db/0x270
[ 21.281185][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.281457][ T12] ret_from_fork_asm+0x11/0x20
[ 21.281742][ T12]
[ 21.282082][ T12] irq event stamp: 12211
[ 21.282279][ T12] hardirqs last enabled at (12211): [] finish_task_switch.isra.0+0x245/0x960
[ 21.282968][ T12] hardirqs last disabled at (12210): [] __schedule+0x94a/0x1b10
[ 21.283432][ T12] softirqs last enabled at (12122): [] handle_softirqs+0x352/0x610
[ 21.283876][ T12] softirqs last disabled at (12113): [] irq_exit_rcu+0xab/0x100
[ 21.284317][ T12] ---[ end trace 0000000000000000 ]---