[ 32.622419][ T71] ==================================================================
[ 32.622953][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 32.623282][ T71] Read of size 1 at addr ffff888008e3c69c by task kworker/u16:1/71
[ 32.623573][ T71]
[ 32.623686][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 32.623693][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 32.623698][ T71] Workqueue: netns cleanup_net
[ 32.623714][ T71] Call Trace:
[ 32.623719][ T71]
[ 32.623722][ T71] dump_stack_lvl+0x82/0xc0
[ 32.623733][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 32.623752][ T71] ? kobject_put+0xbb/0xd0
[ 32.623756][ T71] print_report+0xb4/0x270
[ 32.623759][ T71] ? kobject_put+0xbb/0xd0
[ 32.623762][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 32.623766][ T71] ? kobject_put+0xbb/0xd0
[ 32.623768][ T71] kasan_report+0xca/0x100
[ 32.623772][ T71] ? kobject_put+0xbb/0xd0
[ 32.623778][ T71] kobject_put+0xbb/0xd0
[ 32.623781][ T71] netdev_run_todo+0x5f0/0xc60
[ 32.623790][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 32.623794][ T71] ? generic_xdp_install+0x410/0x410
[ 32.623800][ T71] ops_undo_list+0x714/0x890
[ 32.623805][ T71] ? netns_get+0x110/0x110
[ 32.623808][ T71] ? cleanup_net+0x2d6/0x830
[ 32.623815][ T71] cleanup_net+0x3b2/0x830
[ 32.623819][ T71] ? net_passive_dec+0x190/0x190
[ 32.623823][ T71] ? rcu_is_watching+0x12/0xb0
[ 32.623837][ T71] process_one_work+0xe35/0x1650
[ 32.623851][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 32.623859][ T71] ? assign_work+0x168/0x240
[ 32.623864][ T71] worker_thread+0x591/0xcf0
[ 32.623870][ T71] ? rescuer_thread+0xd10/0xd10
[ 32.623874][ T71] kthread+0x37b/0x5f0
[ 32.623878][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.623881][ T71] ? ret_from_fork+0x1b/0x270
[ 32.623895][ T71] ? __lock_release+0x5d/0x170
[ 32.623900][ T71] ? rcu_is_watching+0x12/0xb0
[ 32.623904][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.623908][ T71] ret_from_fork+0x1db/0x270
[ 32.623910][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.623914][ T71] ret_from_fork_asm+0x11/0x20
[ 32.623930][ T71]
[ 32.623931][ T71]
[ 32.631471][ T71] Allocated by task 256:
[ 32.631639][ T71] kasan_save_stack+0x24/0x40
[ 32.631843][ T71] kasan_save_track+0x14/0x30
[ 32.632024][ T71] __kasan_kmalloc+0x7b/0x90
[ 32.632196][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 32.632378][ T71] alloc_netdev_mqs+0x7d/0x1370
[ 32.632564][ T71] sit_init_net+0x169/0x550
[ 32.632748][ T71] ops_init+0x189/0x550
[ 32.632897][ T71] setup_net+0xf1/0x380
[ 32.633035][ T71] copy_net_ns+0x21a/0x380
[ 32.633211][ T71] create_new_namespaces+0x35f/0x900
[ 32.633389][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 32.633572][ T71] ksys_unshare+0x2a3/0x660
[ 32.633804][ T71] __x64_sys_unshare+0x31/0x40
[ 32.633999][ T71] do_syscall_64+0xc1/0xfd0
[ 32.634233][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 32.634474][ T71]
[ 32.634573][ T71] Freed by task 71:
[ 32.634706][ T71] kasan_save_stack+0x24/0x40
[ 32.634967][ T71] kasan_save_track+0x14/0x30
[ 32.635149][ T71] __kasan_save_free_info+0x3b/0x60
[ 32.635362][ T71] __kasan_slab_free+0x3f/0x60
[ 32.635620][ T71] kfree+0x21d/0x540
[ 32.635813][ T71] device_release+0x9c/0x210
[ 32.636026][ T71] kobject_cleanup+0xfe/0x360
[ 32.636250][ T71] netdev_run_todo+0x81f/0xc60
[ 32.636439][ T71] ops_undo_list+0x714/0x890
[ 32.636620][ T71] cleanup_net+0x3b2/0x830
[ 32.636801][ T71] process_one_work+0xe35/0x1650
[ 32.637054][ T71] worker_thread+0x591/0xcf0
[ 32.637234][ T71] kthread+0x37b/0x5f0
[ 32.637371][ T71] ret_from_fork+0x1db/0x270
[ 32.637552][ T71] ret_from_fork_asm+0x11/0x20
[ 32.637737][ T71]
[ 32.637839][ T71] The buggy address belongs to the object at ffff888008e3c000
[ 32.637839][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 32.638347][ T71] The buggy address is located 1692 bytes inside of
[ 32.638347][ T71] freed 4096-byte region [ffff888008e3c000, ffff888008e3d000)
[ 32.638805][ T71]
[ 32.638900][ T71] The buggy address belongs to the physical page:
[ 32.639122][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8e38
[ 32.639454][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 32.639738][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 32.639972][ T71] page_type: f5(slab)
[ 32.640127][ T71] raw: 0080000000000040 ffff888001043700 ffffea0000099c10 ffffea000028f210
[ 32.640489][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 32.640826][ T71] head: 0080000000000040 ffff888001043700 ffffea0000099c10 ffffea000028f210
[ 32.641156][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 32.641470][ T71] head: 0080000000000003 ffffea0000238e01 00000000ffffffff 00000000ffffffff
[ 32.641775][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 32.642078][ T71] page dumped because: kasan: bad access detected
[ 32.642309][ T71]
[ 32.642409][ T71] Memory state around the buggy address:
[ 32.642603][ T71] ffff888008e3c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.642878][ T71] ffff888008e3c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.643134][ T71] >ffff888008e3c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.643395][ T71] ^
[ 32.643588][ T71] ffff888008e3c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.643843][ T71] ffff888008e3c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.644100][ T71] ==================================================================
[ 32.644453][ T71] Disabling lock debugging due to kernel taint
[ 32.644768][ T71] ------------[ cut here ]------------
[ 32.644991][ T71] refcount_t: underflow; use-after-free.
[ 32.645579][ T71] WARNING: CPU: 3 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 32.645969][ T71] Modules linked in:
[ 32.646145][ T71] CPU: 3 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 32.646589][ T71] Tainted: [B]=BAD_PAGE
[ 32.646749][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 32.647007][ T71] Workqueue: netns cleanup_net
[ 32.647234][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 32.647474][ T71] 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 a8 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
[ 32.648182][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 32.648441][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 32.648739][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 32.649054][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5242934
[ 32.649350][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 32.649649][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 32.649955][ T71] FS: 0000000000000000(0000) GS:ffff88808bd04000(0000) knlGS:0000000000000000
[ 32.650304][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 32.650547][ T71] CR2: 0000563d8b3ea6a8 CR3: 0000000004fd2005 CR4: 0000000000772ef0
[ 32.650869][ T71] PKRU: 55555554
[ 32.651020][ T71] Call Trace:
[ 32.651174][ T71]
[ 32.651284][ T71] netdev_run_todo+0x5f0/0xc60
[ 32.651486][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 32.651680][ T71] ? generic_xdp_install+0x410/0x410
[ 32.651889][ T71] ops_undo_list+0x714/0x890
[ 32.652089][ T71] ? netns_get+0x110/0x110
[ 32.652285][ T71] ? cleanup_net+0x2d6/0x830
[ 32.652469][ T71] cleanup_net+0x3b2/0x830
[ 32.652670][ T71] ? net_passive_dec+0x190/0x190
[ 32.652900][ T71] ? rcu_is_watching+0x12/0xb0
[ 32.653101][ T71] process_one_work+0xe35/0x1650
[ 32.653305][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 32.653491][ T71] ? assign_work+0x168/0x240
[ 32.653683][ T71] worker_thread+0x591/0xcf0
[ 32.653900][ T71] ? rescuer_thread+0xd10/0xd10
[ 32.654097][ T71] kthread+0x37b/0x5f0
[ 32.654254][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.654440][ T71] ? ret_from_fork+0x1b/0x270
[ 32.654634][ T71] ? __lock_release+0x5d/0x170
[ 32.654836][ T71] ? rcu_is_watching+0x12/0xb0
[ 32.655044][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.655236][ T71] ret_from_fork+0x1db/0x270
[ 32.655426][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.655626][ T71] ret_from_fork_asm+0x11/0x20
[ 32.655839][ T71]
[ 32.655993][ T71] irq event stamp: 9907
[ 32.656147][ T71] hardirqs last enabled at (9907): [] finish_task_switch.isra.0+0x245/0x960
[ 32.656545][ T71] hardirqs last disabled at (9906): [] __schedule+0x94a/0x1b10
[ 32.656922][ T71] softirqs last enabled at (9822): [] handle_softirqs+0x352/0x610
[ 32.657278][ T71] softirqs last disabled at (9813): [] irq_exit_rcu+0xab/0x100
[ 32.657612][ T71] ---[ end trace 0000000000000000 ]---
[ 360.124543][ T5353] netem: version 1.3
[ 1125.875121][T14104] ip (14104) used greatest stack depth: 23640 bytes left
[ 2108.386026][T30324] pm_nl_ctl (30324) used greatest stack depth: 22952 bytes left