[ 15.173808][ T258] ip (258) used greatest stack depth: 23616 bytes left
[ 15.586147][ T69] ==================================================================
[ 15.586467][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.586707][ T69] Read of size 1 at addr ffff88800ec8c6c4 by task kworker/u16:1/69
[ 15.586930][ T69]
[ 15.587015][ T69] CPU: 1 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.587020][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.587024][ T69] Workqueue: netns cleanup_net
[ 15.587033][ T69] Call Trace:
[ 15.587036][ T69]
[ 15.587039][ T69] dump_stack_lvl+0x82/0xc0
[ 15.587046][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 15.587053][ T69] ? kobject_put+0xbb/0xd0
[ 15.587057][ T69] print_report+0xb4/0x270
[ 15.587061][ T69] ? kobject_put+0xbb/0xd0
[ 15.587064][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 15.587067][ T69] ? kobject_put+0xbb/0xd0
[ 15.587070][ T69] kasan_report+0xca/0x100
[ 15.587074][ T69] ? kobject_put+0xbb/0xd0
[ 15.587080][ T69] kobject_put+0xbb/0xd0
[ 15.587083][ T69] netdev_run_todo+0x5f0/0xc60
[ 15.587090][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 15.587094][ T69] ? generic_xdp_install+0x410/0x410
[ 15.587097][ T69] ? net_generic+0xb1/0x1f0
[ 15.587106][ T69] ops_undo_list+0x714/0x890
[ 15.587112][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 15.587115][ T69] ? cleanup_net+0x2d6/0x8b0
[ 15.587121][ T69] cleanup_net+0x3b2/0x8b0
[ 15.587125][ T69] ? net_passive_dec+0x190/0x190
[ 15.587130][ T69] ? rcu_is_watching+0x12/0xb0
[ 15.587138][ T69] process_one_work+0xe35/0x1650
[ 15.587149][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.587155][ T69] ? assign_work+0x168/0x240
[ 15.587159][ T69] worker_thread+0x591/0xcf0
[ 15.587165][ T69] ? rescuer_thread+0xd10/0xd10
[ 15.587168][ T69] kthread+0x37b/0x5f0
[ 15.587173][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.587175][ T69] ? ret_from_fork+0x1b/0x270
[ 15.587181][ T69] ? __lock_release+0x5d/0x170
[ 15.587186][ T69] ? rcu_is_watching+0x12/0xb0
[ 15.587189][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.587193][ T69] ret_from_fork+0x1db/0x270
[ 15.587196][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.587199][ T69] ret_from_fork_asm+0x11/0x20
[ 15.587210][ T69]
[ 15.587212][ T69]
[ 15.593565][ T69] Allocated by task 257:
[ 15.593692][ T69] kasan_save_stack+0x24/0x40
[ 15.593865][ T69] kasan_save_track+0x14/0x30
[ 15.594026][ T69] __kasan_kmalloc+0x7b/0x90
[ 15.594190][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.594367][ T69] alloc_netdev_mqs+0x7d/0x1370
[ 15.594535][ T69] ip6_tnl_init_net+0x102/0x3f0
[ 15.594703][ T69] ops_init+0x189/0x550
[ 15.594826][ T69] setup_net+0xf1/0x380
[ 15.594949][ T69] copy_net_ns+0x253/0x510
[ 15.595111][ T69] create_new_namespaces+0x35f/0x900
[ 15.595275][ T69] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 15.595448][ T69] ksys_unshare+0x2be/0x6e0
[ 15.595612][ T69] __x64_sys_unshare+0x31/0x40
[ 15.595774][ T69] do_syscall_64+0xc1/0xfd0
[ 15.595941][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.596141][ T69]
[ 15.596222][ T69] Freed by task 69:
[ 15.596361][ T69] kasan_save_stack+0x24/0x40
[ 15.596528][ T69] kasan_save_track+0x14/0x30
[ 15.596690][ T69] __kasan_save_free_info+0x3b/0x60
[ 15.596851][ T69] __kasan_slab_free+0x3f/0x60
[ 15.597014][ T69] kfree+0x21d/0x540
[ 15.597136][ T69] device_release+0x9c/0x210
[ 15.597306][ T69] kobject_cleanup+0xfe/0x360
[ 15.597478][ T69] netdev_run_todo+0x81f/0xc60
[ 15.597647][ T69] ops_undo_list+0x714/0x890
[ 15.597812][ T69] cleanup_net+0x3b2/0x8b0
[ 15.597977][ T69] process_one_work+0xe35/0x1650
[ 15.598144][ T69] worker_thread+0x591/0xcf0
[ 15.598314][ T69] kthread+0x37b/0x5f0
[ 15.598438][ T69] ret_from_fork+0x1db/0x270
[ 15.598602][ T69] ret_from_fork_asm+0x11/0x20
[ 15.598769][ T69]
[ 15.598853][ T69] The buggy address belongs to the object at ffff88800ec8c000
[ 15.598853][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 15.599238][ T69] The buggy address is located 1732 bytes inside of
[ 15.599238][ T69] freed 4096-byte region [ffff88800ec8c000, ffff88800ec8d000)
[ 15.599637][ T69]
[ 15.599720][ T69] The buggy address belongs to the physical page:
[ 15.599921][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xec88
[ 15.600208][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.600476][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.600692][ T69] page_type: f5(slab)
[ 15.600823][ T69] raw: 0080000000000040 ffff888001043700 ffffea000039bc10 ffffea00003b1a10
[ 15.601117][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.601429][ T69] head: 0080000000000040 ffff888001043700 ffffea000039bc10 ffffea00003b1a10
[ 15.601714][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.602000][ T69] head: 0080000000000003 ffffea00003b2201 00000000ffffffff 00000000ffffffff
[ 15.602289][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.602580][ T69] page dumped because: kasan: bad access detected
[ 15.602778][ T69]
[ 15.602859][ T69] Memory state around the buggy address:
[ 15.603014][ T69] ffff88800ec8c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.603244][ T69] ffff88800ec8c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.603484][ T69] >ffff88800ec8c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.603717][ T69] ^
[ 15.603913][ T69] ffff88800ec8c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.604145][ T69] ffff88800ec8c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.604383][ T69] ==================================================================
[ 15.604686][ T69] Disabling lock debugging due to kernel taint
[ 15.604911][ T69] ------------[ cut here ]------------
[ 15.605056][ T69] refcount_t: underflow; use-after-free.
[ 15.605240][ T69] WARNING: CPU: 3 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.605618][ T69] Modules linked in:
[ 15.605749][ T69] CPU: 3 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.606109][ T69] Tainted: [B]=BAD_PAGE
[ 15.606229][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.606431][ T69] Workqueue: netns cleanup_net
[ 15.606613][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.606821][ T69] 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 e5 a9 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
[ 15.607404][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 15.607609][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.607850][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.608093][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff55c0934
[ 15.608340][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 15.608569][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.608808][ T69] FS: 0000000000000000(0000) GS:ffff8880c0e88000(0000) knlGS:0000000000000000
[ 15.609083][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.609276][ T69] CR2: 00007ffeab0070f8 CR3: 0000000014f7d002 CR4: 0000000000772ef0
[ 15.609517][ T69] PKRU: 55555554
[ 15.609637][ T69] Call Trace:
[ 15.609763][ T69]
[ 15.609846][ T69] netdev_run_todo+0x5f0/0xc60
[ 15.610008][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 15.610174][ T69] ? generic_xdp_install+0x410/0x410
[ 15.610362][ T69] ? net_generic+0xb1/0x1f0
[ 15.610525][ T69] ops_undo_list+0x714/0x890
[ 15.610681][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 15.610846][ T69] ? cleanup_net+0x2d6/0x8b0
[ 15.611005][ T69] cleanup_net+0x3b2/0x8b0
[ 15.611159][ T69] ? net_passive_dec+0x190/0x190
[ 15.611320][ T69] ? rcu_is_watching+0x12/0xb0
[ 15.611492][ T69] process_one_work+0xe35/0x1650
[ 15.611658][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.611822][ T69] ? assign_work+0x168/0x240
[ 15.611978][ T69] worker_thread+0x591/0xcf0
[ 15.612132][ T69] ? rescuer_thread+0xd10/0xd10
[ 15.612286][ T69] kthread+0x37b/0x5f0
[ 15.612416][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.612570][ T69] ? ret_from_fork+0x1b/0x270
[ 15.612734][ T69] ? __lock_release+0x5d/0x170
[ 15.612889][ T69] ? rcu_is_watching+0x12/0xb0
[ 15.613040][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.613191][ T69] ret_from_fork+0x1db/0x270
[ 15.613350][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.613506][ T69] ret_from_fork_asm+0x11/0x20
[ 15.613667][ T69]
[ 15.613790][ T69] irq event stamp: 8317
[ 15.613904][ T69] hardirqs last enabled at (8317): [] finish_task_switch.isra.0+0x245/0x960
[ 15.614210][ T69] hardirqs last disabled at (8316): [] __schedule+0x94a/0x1b10
[ 15.614487][ T69] softirqs last enabled at (8046): [] handle_softirqs+0x352/0x610
[ 15.614757][ T69] softirqs last disabled at (8041): [] irq_exit_rcu+0xab/0x100
[ 15.615020][ T69] ---[ end trace 0000000000000000 ]---