[ 19.663370][ T254] ip (254) used greatest stack depth: 23856 bytes left
[ 32.279106][ T12] ==================================================================
[ 32.279488][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 32.279785][ T12] Read of size 1 at addr ffff88800203469c by task kworker/u16:0/12
[ 32.280055][ T12]
[ 32.280165][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 32.280171][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 32.280174][ T12] Workqueue: netns cleanup_net
[ 32.280182][ T12] Call Trace:
[ 32.280184][ T12]
[ 32.280187][ T12] dump_stack_lvl+0x82/0xc0
[ 32.280193][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 32.280200][ T12] ? kobject_put+0xbb/0xd0
[ 32.280206][ T12] print_report+0xb4/0x270
[ 32.280211][ T12] ? kobject_put+0xbb/0xd0
[ 32.280215][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 32.280220][ T12] ? kobject_put+0xbb/0xd0
[ 32.280224][ T12] kasan_report+0xca/0x100
[ 32.280230][ T12] ? kobject_put+0xbb/0xd0
[ 32.280236][ T12] kobject_put+0xbb/0xd0
[ 32.280239][ T12] netdev_run_todo+0x5f0/0xc60
[ 32.280245][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 32.280248][ T12] ? generic_xdp_install+0x410/0x410
[ 32.280254][ T12] ops_undo_list+0x714/0x890
[ 32.280260][ T12] ? netns_get+0x110/0x110
[ 32.280262][ T12] ? cleanup_net+0x2d6/0x830
[ 32.280268][ T12] cleanup_net+0x3b2/0x830
[ 32.280274][ T12] ? net_passive_dec+0x190/0x190
[ 32.280281][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.280289][ T12] process_one_work+0xe35/0x1650
[ 32.280301][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 32.280307][ T12] ? assign_work+0x168/0x240
[ 32.280312][ T12] worker_thread+0x591/0xcf0
[ 32.280318][ T12] ? rescuer_thread+0xd10/0xd10
[ 32.280322][ T12] kthread+0x37b/0x5f0
[ 32.280327][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.280330][ T12] ? ret_from_fork+0x1b/0x270
[ 32.280335][ T12] ? __lock_release+0x5d/0x170
[ 32.280339][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.280343][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.280347][ T12] ret_from_fork+0x1db/0x270
[ 32.280349][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.280353][ T12] ret_from_fork_asm+0x11/0x20
[ 32.280363][ T12]
[ 32.280364][ T12]
[ 32.287214][ T12] Allocated by task 314:
[ 32.287366][ T12] kasan_save_stack+0x24/0x40
[ 32.287561][ T12] kasan_save_track+0x14/0x30
[ 32.287731][ T12] __kasan_kmalloc+0x7b/0x90
[ 32.287907][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 32.288070][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 32.288258][ T12] sit_init_net+0x169/0x550
[ 32.288509][ T12] ops_init+0x189/0x550
[ 32.288636][ T12] setup_net+0xf1/0x380
[ 32.288764][ T12] copy_net_ns+0x21a/0x380
[ 32.288943][ T12] create_new_namespaces+0x35f/0x900
[ 32.289120][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 32.289317][ T12] ksys_unshare+0x2a3/0x660
[ 32.289482][ T12] __x64_sys_unshare+0x31/0x40
[ 32.289665][ T12] do_syscall_64+0xc1/0xfd0
[ 32.289879][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 32.290090][ T12]
[ 32.290176][ T12] Freed by task 12:
[ 32.290317][ T12] kasan_save_stack+0x24/0x40
[ 32.290499][ T12] kasan_save_track+0x14/0x30
[ 32.290696][ T12] __kasan_save_free_info+0x3b/0x60
[ 32.290882][ T12] __kasan_slab_free+0x3f/0x60
[ 32.291048][ T12] kfree+0x21d/0x540
[ 32.291181][ T12] device_release+0x9c/0x210
[ 32.291368][ T12] kobject_cleanup+0xfe/0x360
[ 32.291550][ T12] netdev_run_todo+0x81f/0xc60
[ 32.291717][ T12] ops_undo_list+0x714/0x890
[ 32.291889][ T12] cleanup_net+0x3b2/0x830
[ 32.292051][ T12] process_one_work+0xe35/0x1650
[ 32.292269][ T12] worker_thread+0x591/0xcf0
[ 32.292444][ T12] kthread+0x37b/0x5f0
[ 32.292584][ T12] ret_from_fork+0x1db/0x270
[ 32.292750][ T12] ret_from_fork_asm+0x11/0x20
[ 32.292923][ T12]
[ 32.293007][ T12] The buggy address belongs to the object at ffff888002034000
[ 32.293007][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 32.293431][ T12] The buggy address is located 1692 bytes inside of
[ 32.293431][ T12] freed 4096-byte region [ffff888002034000, ffff888002035000)
[ 32.293856][ T12]
[ 32.293948][ T12] The buggy address belongs to the physical page:
[ 32.294157][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2030
[ 32.294480][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 32.294807][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 32.295022][ T12] page_type: f5(slab)
[ 32.295156][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002f5010 ffffea0000148610
[ 32.295486][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 32.295791][ T12] head: 0080000000000040 ffff888001043700 ffffea00002f5010 ffffea0000148610
[ 32.296086][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 32.296414][ T12] head: 0080000000000003 ffffea0000080c01 00000000ffffffff 00000000ffffffff
[ 32.296725][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 32.297026][ T12] page dumped because: kasan: bad access detected
[ 32.297250][ T12]
[ 32.297342][ T12] Memory state around the buggy address:
[ 32.297528][ T12] ffff888002034580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.297772][ T12] ffff888002034600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.298010][ T12] >ffff888002034680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.298260][ T12] ^
[ 32.298429][ T12] ffff888002034700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.298684][ T12] ffff888002034780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.298934][ T12] ==================================================================
[ 32.299309][ T12] Disabling lock debugging due to kernel taint
[ 32.299715][ T12] ------------[ cut here ]------------
[ 32.299960][ T12] refcount_t: underflow; use-after-free.
[ 32.300253][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 32.300690][ T12] Modules linked in:
[ 32.300888][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 32.301450][ T12] Tainted: [B]=BAD_PAGE
[ 32.301640][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 32.301968][ T12] Workqueue: netns cleanup_net
[ 32.302236][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 32.302622][ 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 85 b0 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
[ 32.303601][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 32.304010][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 32.304388][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 32.304741][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6242934
[ 32.305101][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 32.305477][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 32.305831][ T12] FS: 0000000000000000(0000) GS:ffff888083b84000(0000) knlGS:0000000000000000
[ 32.306243][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 32.306555][ T12] CR2: 00000000004a00a4 CR3: 0000000017f59006 CR4: 0000000000772ef0
[ 32.306926][ T12] PKRU: 55555554
[ 32.307116][ T12] Call Trace:
[ 32.307310][ T12]
[ 32.307438][ T12] netdev_run_todo+0x5f0/0xc60
[ 32.307677][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 32.307925][ T12] ? generic_xdp_install+0x410/0x410
[ 32.308177][ T12] ops_undo_list+0x714/0x890
[ 32.308422][ T12] ? netns_get+0x110/0x110
[ 32.308655][ T12] ? cleanup_net+0x2d6/0x830
[ 32.308914][ T12] cleanup_net+0x3b2/0x830
[ 32.309153][ T12] ? net_passive_dec+0x190/0x190
[ 32.309405][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.309665][ T12] process_one_work+0xe35/0x1650
[ 32.309920][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 32.310169][ T12] ? assign_work+0x168/0x240
[ 32.310413][ T12] worker_thread+0x591/0xcf0
[ 32.310654][ T12] ? rescuer_thread+0xd10/0xd10
[ 32.310931][ T12] kthread+0x37b/0x5f0
[ 32.311136][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.311452][ T12] ? ret_from_fork+0x1b/0x270
[ 32.311692][ T12] ? __lock_release+0x5d/0x170
[ 32.311928][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.312165][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.312417][ T12] ret_from_fork+0x1db/0x270
[ 32.312654][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.312907][ T12] ret_from_fork_asm+0x11/0x20
[ 32.313155][ T12]
[ 32.313345][ T12] irq event stamp: 8581
[ 32.313536][ T12] hardirqs last enabled at (8581): [] finish_task_switch.isra.0+0x245/0x960
[ 32.314019][ T12] hardirqs last disabled at (8580): [] __schedule+0x94a/0x1b10
[ 32.314481][ T12] softirqs last enabled at (7702): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 32.314987][ T12] softirqs last disabled at (7700): [] dev_mc_flush+0x54/0x90
[ 32.315418][ T12] ---[ end trace 0000000000000000 ]---
[ 40.612467][ T383] netem: version 1.3
[ 144.365138][ T1831] mptcp_connect (1831) used greatest stack depth: 23688 bytes left
[ 185.712157][ T2287] mptcp_connect (2287) used greatest stack depth: 23656 bytes left