[ 19.502864][ T12] ==================================================================
[ 19.503181][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 19.503438][ T12] Read of size 1 at addr ffff8880050a46c4 by task kworker/u16:0/12
[ 19.503689][ T12]
[ 19.503771][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.503781][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.503784][ T12] Workqueue: netns cleanup_net
[ 19.503794][ T12] Call Trace:
[ 19.503796][ T12]
[ 19.503800][ T12] dump_stack_lvl+0x82/0xc0
[ 19.503806][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 19.503815][ T12] ? kobject_put+0xbb/0xd0
[ 19.503819][ T12] print_report+0xb4/0x270
[ 19.503822][ T12] ? kobject_put+0xbb/0xd0
[ 19.503825][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 19.503829][ T12] ? kobject_put+0xbb/0xd0
[ 19.503832][ T12] kasan_report+0xca/0x100
[ 19.503836][ T12] ? kobject_put+0xbb/0xd0
[ 19.503841][ T12] kobject_put+0xbb/0xd0
[ 19.503845][ T12] netdev_run_todo+0x5f0/0xc60
[ 19.503852][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 19.503855][ T12] ? generic_xdp_install+0x410/0x410
[ 19.503858][ T12] ? net_generic+0xb1/0x1f0
[ 19.503873][ T12] ops_undo_list+0x714/0x890
[ 19.503878][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.503882][ T12] ? cleanup_net+0x2d6/0x8b0
[ 19.503888][ T12] cleanup_net+0x3b2/0x8b0
[ 19.503892][ T12] ? net_passive_dec+0x190/0x190
[ 19.503897][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.503905][ T12] process_one_work+0xe35/0x1650
[ 19.503915][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.503921][ T12] ? assign_work+0x168/0x240
[ 19.503926][ T12] worker_thread+0x591/0xcf0
[ 19.503931][ T12] ? rescuer_thread+0xd10/0xd10
[ 19.503935][ T12] kthread+0x37b/0x5f0
[ 19.503940][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.503942][ T12] ? ret_from_fork+0x1b/0x270
[ 19.503948][ T12] ? __lock_release+0x5d/0x170
[ 19.503953][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.503956][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.503960][ T12] ret_from_fork+0x1db/0x270
[ 19.503962][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.503966][ T12] ret_from_fork_asm+0x11/0x20
[ 19.503977][ T12]
[ 19.503978][ T12]
[ 19.510678][ T12] Allocated by task 260:
[ 19.510801][ T12] kasan_save_stack+0x24/0x40
[ 19.510979][ T12] kasan_save_track+0x14/0x30
[ 19.511141][ T12] __kasan_kmalloc+0x7b/0x90
[ 19.511314][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 19.511478][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 19.511667][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 19.511835][ T12] ops_init+0x189/0x550
[ 19.511963][ T12] setup_net+0xf1/0x380
[ 19.512090][ T12] copy_net_ns+0x253/0x510
[ 19.512255][ T12] create_new_namespaces+0x35f/0x900
[ 19.512444][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 19.512627][ T12] ksys_unshare+0x2be/0x6e0
[ 19.512789][ T12] __x64_sys_unshare+0x31/0x40
[ 19.512949][ T12] do_syscall_64+0xc1/0xfd0
[ 19.513213][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.513445][ T12]
[ 19.513533][ T12] Freed by task 12:
[ 19.513661][ T12] kasan_save_stack+0x24/0x40
[ 19.513918][ T12] kasan_save_track+0x14/0x30
[ 19.514173][ T12] __kasan_save_free_info+0x3b/0x60
[ 19.514342][ T12] __kasan_slab_free+0x3f/0x60
[ 19.514520][ T12] kfree+0x21d/0x540
[ 19.514735][ T12] device_release+0x9c/0x210
[ 19.514907][ T12] kobject_cleanup+0xfe/0x360
[ 19.515073][ T12] netdev_run_todo+0x81f/0xc60
[ 19.515256][ T12] ops_undo_list+0x714/0x890
[ 19.515520][ T12] cleanup_net+0x3b2/0x8b0
[ 19.515686][ T12] process_one_work+0xe35/0x1650
[ 19.515939][ T12] worker_thread+0x591/0xcf0
[ 19.516113][ T12] kthread+0x37b/0x5f0
[ 19.516251][ T12] ret_from_fork+0x1db/0x270
[ 19.516410][ T12] ret_from_fork_asm+0x11/0x20
[ 19.516586][ T12]
[ 19.516672][ T12] The buggy address belongs to the object at ffff8880050a4000
[ 19.516672][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 19.517080][ T12] The buggy address is located 1732 bytes inside of
[ 19.517080][ T12] freed 4096-byte region [ffff8880050a4000, ffff8880050a5000)
[ 19.517500][ T12]
[ 19.517594][ T12] The buggy address belongs to the physical page:
[ 19.517908][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x50a0
[ 19.518336][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 19.518692][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 19.518905][ T12] page_type: f5(slab)
[ 19.519084][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002eb210 ffffea0000145010
[ 19.519403][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.519690][ T12] head: 0080000000000040 ffff888001043700 ffffea00002eb210 ffffea0000145010
[ 19.519983][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 19.520283][ T12] head: 0080000000000003 ffffea0000142801 00000000ffffffff 00000000ffffffff
[ 19.520564][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 19.520957][ T12] page dumped because: kasan: bad access detected
[ 19.521251][ T12]
[ 19.521345][ T12] Memory state around the buggy address:
[ 19.521514][ T12] ffff8880050a4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.521875][ T12] ffff8880050a4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.522107][ T12] >ffff8880050a4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.522429][ T12] ^
[ 19.522634][ T12] ffff8880050a4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.522875][ T12] ffff8880050a4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.523200][ T12] ==================================================================
[ 19.523564][ T12] Disabling lock debugging due to kernel taint
[ 19.523849][ T12] ------------[ cut here ]------------
[ 19.524129][ T12] refcount_t: underflow; use-after-free.
[ 19.524322][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 19.524640][ T12] Modules linked in:
[ 19.524779][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.525288][ T12] Tainted: [B]=BAD_PAGE
[ 19.525431][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.525643][ T12] Workqueue: netns cleanup_net
[ 19.525819][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 19.526161][ 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 e5 8b 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
[ 19.526771][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 19.527090][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 19.527333][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 19.527588][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff19c0934
[ 19.527959][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 19.528232][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 19.528582][ T12] FS: 0000000000000000(0000) GS:ffff8880ded88000(0000) knlGS:0000000000000000
[ 19.528877][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.529117][ T12] CR2: 00007ffdf5220fd8 CR3: 0000000017149003 CR4: 0000000000772ef0
[ 19.529463][ T12] PKRU: 55555554
[ 19.529591][ T12] Call Trace:
[ 19.529714][ T12]
[ 19.529807][ T12] netdev_run_todo+0x5f0/0xc60
[ 19.530092][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 19.530256][ T12] ? generic_xdp_install+0x410/0x410
[ 19.530422][ T12] ? net_generic+0xb1/0x1f0
[ 19.530598][ T12] ops_undo_list+0x714/0x890
[ 19.530776][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 19.531058][ T12] ? cleanup_net+0x2d6/0x8b0
[ 19.531251][ T12] cleanup_net+0x3b2/0x8b0
[ 19.531430][ T12] ? net_passive_dec+0x190/0x190
[ 19.531638][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.531945][ T12] process_one_work+0xe35/0x1650
[ 19.532118][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 19.532285][ T12] ? assign_work+0x168/0x240
[ 19.532466][ T12] worker_thread+0x591/0xcf0
[ 19.532722][ T12] ? rescuer_thread+0xd10/0xd10
[ 19.532884][ T12] kthread+0x37b/0x5f0
[ 19.533035][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.533210][ T12] ? ret_from_fork+0x1b/0x270
[ 19.533476][ T12] ? __lock_release+0x5d/0x170
[ 19.533648][ T12] ? rcu_is_watching+0x12/0xb0
[ 19.533811][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.533994][ T12] ret_from_fork+0x1db/0x270
[ 19.534264][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 19.534426][ T12] ret_from_fork_asm+0x11/0x20
[ 19.534602][ T12]
[ 19.534756][ T12] irq event stamp: 15741
[ 19.534991][ T12] hardirqs last enabled at (15741): [] finish_task_switch.isra.0+0x245/0x960
[ 19.535318][ T12] hardirqs last disabled at (15740): [] __schedule+0x94a/0x1b10
[ 19.535615][ T12] softirqs last enabled at (14884): [] unregister_netdevice_many_notify+0x714/0x1c90
[ 19.536058][ T12] softirqs last disabled at (14882): [] dev_mc_flush+0x54/0x90
[ 19.536351][ T12] ---[ end trace 0000000000000000 ]---