[ 17.563821][ T12] ==================================================================
[ 17.564209][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 17.564563][ T12] Read of size 1 at addr ffff8880084e16c4 by task kworker/u16:0/12
[ 17.564945][ T12]
[ 17.565042][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.565047][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.565050][ T12] Workqueue: netns cleanup_net
[ 17.565078][ T12] Call Trace:
[ 17.565080][ T12]
[ 17.565088][ T12] dump_stack_lvl+0x82/0xc0
[ 17.565094][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 17.565105][ T12] ? kobject_put+0xbb/0xd0
[ 17.565109][ T12] print_report+0xb4/0x270
[ 17.565114][ T12] ? kobject_put+0xbb/0xd0
[ 17.565117][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 17.565120][ T12] ? kobject_put+0xbb/0xd0
[ 17.565124][ T12] kasan_report+0xca/0x100
[ 17.565128][ T12] ? kobject_put+0xbb/0xd0
[ 17.565133][ T12] kobject_put+0xbb/0xd0
[ 17.565137][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.565142][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.565146][ T12] ? generic_xdp_install+0x410/0x410
[ 17.565149][ T12] ? net_generic+0xb1/0x1f0
[ 17.565157][ T12] ops_undo_list+0x714/0x890
[ 17.565167][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 17.565175][ T12] ? cleanup_net+0x2d6/0x8b0
[ 17.565185][ T12] cleanup_net+0x3b2/0x8b0
[ 17.565193][ T12] ? net_passive_dec+0x190/0x190
[ 17.565198][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.565209][ T12] process_one_work+0xe35/0x1650
[ 17.565221][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.565226][ T12] ? assign_work+0x168/0x240
[ 17.565231][ T12] worker_thread+0x591/0xcf0
[ 17.565237][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.565241][ T12] kthread+0x37b/0x5f0
[ 17.565245][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.565247][ T12] ? ret_from_fork+0x1b/0x270
[ 17.565258][ T12] ? __lock_release+0x5d/0x170
[ 17.565264][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.565267][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.565271][ T12] ret_from_fork+0x1db/0x270
[ 17.565274][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.565277][ T12] ret_from_fork_asm+0x11/0x20
[ 17.565290][ T12]
[ 17.565291][ T12]
[ 17.572684][ T12] Allocated by task 258:
[ 17.572834][ T12] kasan_save_stack+0x24/0x40
[ 17.573056][ T12] kasan_save_track+0x14/0x30
[ 17.573310][ T12] __kasan_kmalloc+0x7b/0x90
[ 17.573506][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 17.573712][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 17.573938][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 17.574161][ T12] ops_init+0x189/0x550
[ 17.574312][ T12] setup_net+0xf1/0x380
[ 17.574456][ T12] copy_net_ns+0x253/0x510
[ 17.574659][ T12] create_new_namespaces+0x35f/0x900
[ 17.574867][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 17.575095][ T12] ksys_unshare+0x2be/0x6e0
[ 17.575393][ T12] __x64_sys_unshare+0x31/0x40
[ 17.575590][ T12] do_syscall_64+0xc1/0xfd0
[ 17.575773][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.576105][ T12]
[ 17.576194][ T12] Freed by task 12:
[ 17.576346][ T12] kasan_save_stack+0x24/0x40
[ 17.576532][ T12] kasan_save_track+0x14/0x30
[ 17.576729][ T12] __kasan_save_free_info+0x3b/0x60
[ 17.577022][ T12] __kasan_slab_free+0x3f/0x60
[ 17.577249][ T12] kfree+0x21d/0x540
[ 17.577378][ T12] device_release+0x9c/0x210
[ 17.577572][ T12] kobject_cleanup+0xfe/0x360
[ 17.577915][ T12] netdev_run_todo+0x81f/0xc60
[ 17.578152][ T12] ops_undo_list+0x714/0x890
[ 17.578422][ T12] cleanup_net+0x3b2/0x8b0
[ 17.578631][ T12] process_one_work+0xe35/0x1650
[ 17.578901][ T12] worker_thread+0x591/0xcf0
[ 17.579103][ T12] kthread+0x37b/0x5f0
[ 17.579243][ T12] ret_from_fork+0x1db/0x270
[ 17.579411][ T12] ret_from_fork_asm+0x11/0x20
[ 17.579620][ T12]
[ 17.579819][ T12] The buggy address belongs to the object at ffff8880084e1000
[ 17.579819][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 17.580317][ T12] The buggy address is located 1732 bytes inside of
[ 17.580317][ T12] freed 4096-byte region [ffff8880084e1000, ffff8880084e2000)
[ 17.580872][ T12]
[ 17.580976][ T12] The buggy address belongs to the physical page:
[ 17.581206][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x84e0
[ 17.581633][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 17.581932][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 17.582168][ T12] page_type: f5(slab)
[ 17.582321][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000213410 ffffea00001e5410
[ 17.582641][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.583017][ T12] head: 0080000000000040 ffff888001043700 ffffea0000213410 ffffea00001e5410
[ 17.583346][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.583700][ T12] head: 0080000000000003 ffffea0000213801 00000000ffffffff 00000000ffffffff
[ 17.584245][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 17.584637][ T12] page dumped because: kasan: bad access detected
[ 17.584870][ T12]
[ 17.584961][ T12] Memory state around the buggy address:
[ 17.585147][ T12] ffff8880084e1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.585438][ T12] ffff8880084e1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.585724][ T12] >ffff8880084e1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.586088][ T12] ^
[ 17.586315][ T12] ffff8880084e1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.586590][ T12] ffff8880084e1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.586925][ T12] ==================================================================
[ 17.587928][ T12] Disabling lock debugging due to kernel taint
[ 17.588674][ T12] ------------[ cut here ]------------
[ 17.588878][ T12] refcount_t: underflow; use-after-free.
[ 17.589097][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.589463][ T12] Modules linked in:
[ 17.589627][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.590060][ T12] Tainted: [B]=BAD_PAGE
[ 17.590226][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.590474][ T12] Workqueue: netns cleanup_net
[ 17.590715][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.590991][ 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 25 b8 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
[ 17.591782][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 17.592054][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.592491][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.592754][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7240934
[ 17.593007][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 17.593380][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.593645][ T12] FS: 0000000000000000(0000) GS:ffff8880b2908000(0000) knlGS:0000000000000000
[ 17.594007][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.594573][ T12] CR2: 00007f3bbe86a840 CR3: 0000000021f49004 CR4: 0000000000772ef0
[ 17.594902][ T12] PKRU: 55555554
[ 17.595059][ T12] Call Trace:
[ 17.595399][ T12]
[ 17.595490][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.595656][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.595846][ T12] ? generic_xdp_install+0x410/0x410
[ 17.596187][ T12] ? net_generic+0xb1/0x1f0
[ 17.596395][ T12] ops_undo_list+0x714/0x890
[ 17.596564][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 17.596717][ T12] ? cleanup_net+0x2d6/0x8b0
[ 17.596883][ T12] cleanup_net+0x3b2/0x8b0
[ 17.597109][ T12] ? net_passive_dec+0x190/0x190
[ 17.597414][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.597586][ T12] process_one_work+0xe35/0x1650
[ 17.597762][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.597931][ T12] ? assign_work+0x168/0x240
[ 17.598097][ T12] worker_thread+0x591/0xcf0
[ 17.598419][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.598633][ T12] kthread+0x37b/0x5f0
[ 17.598753][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.598985][ T12] ? ret_from_fork+0x1b/0x270
[ 17.599159][ T12] ? __lock_release+0x5d/0x170
[ 17.599456][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.599656][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.599812][ T12] ret_from_fork+0x1db/0x270
[ 17.600027][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.600228][ T12] ret_from_fork_asm+0x11/0x20
[ 17.600425][ T12]
[ 17.600567][ T12] irq event stamp: 14219
[ 17.600714][ T12] hardirqs last enabled at (14219): [] __call_rcu_common.constprop.0+0x318/0x630
[ 17.601065][ T12] hardirqs last disabled at (14218): [] __call_rcu_common.constprop.0+0x322/0x630
[ 17.601488][ T12] softirqs last enabled at (13902): [] handle_softirqs+0x352/0x610
[ 17.601808][ T12] softirqs last disabled at (13895): [] irq_exit_rcu+0xab/0x100
[ 17.602121][ T12] ---[ end trace 0000000000000000 ]---