[ 16.643442][ T12] ==================================================================
[ 16.644000][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.644453][ T12] Read of size 1 at addr ffff8880029bc694 by task kworker/u16:0/12
[ 16.644830][ T12]
[ 16.644971][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.644980][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.644984][ T12] Workqueue: netns cleanup_net
[ 16.644995][ T12] Call Trace:
[ 16.644999][ T12]
[ 16.645003][ T12] dump_stack_lvl+0x82/0xc0
[ 16.645014][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 16.645025][ T12] ? kobject_put+0xbb/0xd0
[ 16.645031][ T12] print_report+0xb4/0x270
[ 16.645037][ T12] ? kobject_put+0xbb/0xd0
[ 16.645041][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 16.645047][ T12] ? kobject_put+0xbb/0xd0
[ 16.645051][ T12] kasan_report+0xca/0x100
[ 16.645058][ T12] ? kobject_put+0xbb/0xd0
[ 16.645067][ T12] kobject_put+0xbb/0xd0
[ 16.645072][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.645082][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.645089][ T12] ? generic_xdp_install+0x410/0x410
[ 16.645101][ T12] ops_undo_list+0x714/0x890
[ 16.645110][ T12] ? netns_get+0x110/0x110
[ 16.645114][ T12] ? cleanup_net+0x2d6/0x830
[ 16.645123][ T12] cleanup_net+0x3b2/0x830
[ 16.645129][ T12] ? net_passive_dec+0x190/0x190
[ 16.645136][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.645146][ T12] process_one_work+0xe35/0x1650
[ 16.645159][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.645168][ T12] ? assign_work+0x168/0x240
[ 16.645173][ T12] worker_thread+0x591/0xcf0
[ 16.645183][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.645188][ T12] kthread+0x37b/0x5f0
[ 16.645193][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.645196][ T12] ? ret_from_fork+0x1b/0x270
[ 16.645204][ T12] ? __lock_release+0x5d/0x170
[ 16.645212][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.645217][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.645222][ T12] ret_from_fork+0x1db/0x270
[ 16.645227][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.645232][ T12] ret_from_fork_asm+0x11/0x20
[ 16.645247][ T12]
[ 16.645250][ T12]
[ 16.653065][ T12] Allocated by task 229:
[ 16.653205][ T12] kasan_save_stack+0x24/0x40
[ 16.653433][ T12] kasan_save_track+0x14/0x30
[ 16.653622][ T12] __kasan_kmalloc+0x7b/0x90
[ 16.653797][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.653979][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 16.654164][ T12] sit_init_net+0x169/0x550
[ 16.654379][ T12] ops_init+0x189/0x550
[ 16.654514][ T12] setup_net+0xf1/0x380
[ 16.654650][ T12] copy_net_ns+0x21a/0x380
[ 16.654826][ T12] create_new_namespaces+0x35f/0x900
[ 16.655011][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 16.655198][ T12] ksys_unshare+0x2a3/0x660
[ 16.655401][ T12] __x64_sys_unshare+0x31/0x40
[ 16.655592][ T12] do_syscall_64+0xc1/0xfd0
[ 16.655778][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.655998][ T12]
[ 16.656097][ T12] Freed by task 12:
[ 16.656248][ T12] kasan_save_stack+0x24/0x40
[ 16.656430][ T12] kasan_save_track+0x14/0x30
[ 16.656660][ T12] __kasan_save_free_info+0x3b/0x60
[ 16.656861][ T12] __kasan_slab_free+0x3f/0x60
[ 16.657075][ T12] kfree+0x21d/0x540
[ 16.657227][ T12] device_release+0x9c/0x210
[ 16.657416][ T12] kobject_cleanup+0xfe/0x360
[ 16.657628][ T12] netdev_run_todo+0x81f/0xc60
[ 16.657847][ T12] ops_undo_list+0x714/0x890
[ 16.658041][ T12] cleanup_net+0x3b2/0x830
[ 16.658259][ T12] process_one_work+0xe35/0x1650
[ 16.658469][ T12] worker_thread+0x591/0xcf0
[ 16.658688][ T12] kthread+0x37b/0x5f0
[ 16.658834][ T12] ret_from_fork+0x1db/0x270
[ 16.659061][ T12] ret_from_fork_asm+0x11/0x20
[ 16.659336][ T12]
[ 16.659469][ T12] The buggy address belongs to the object at ffff8880029bc000
[ 16.659469][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 16.659950][ T12] The buggy address is located 1684 bytes inside of
[ 16.659950][ T12] freed 4096-byte region [ffff8880029bc000, ffff8880029bd000)
[ 16.660462][ T12]
[ 16.660565][ T12] The buggy address belongs to the physical page:
[ 16.660803][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29b8
[ 16.661166][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.661539][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.661805][ T12] page_type: f5(slab)
[ 16.661952][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001fd010 ffffea00001cb810
[ 16.662323][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.662675][ T12] head: 0080000000000040 ffff888001043700 ffffea00001fd010 ffffea00001cb810
[ 16.663009][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.663373][ T12] head: 0080000000000003 ffffea00000a6e01 00000000ffffffff 00000000ffffffff
[ 16.663772][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.664246][ T12] page dumped because: kasan: bad access detected
[ 16.664651][ T12]
[ 16.664798][ T12] Memory state around the buggy address:
[ 16.665062][ T12] ffff8880029bc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.665544][ T12] ffff8880029bc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.665982][ T12] >ffff8880029bc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.666447][ T12] ^
[ 16.666731][ T12] ffff8880029bc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.667129][ T12] ffff8880029bc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.667586][ T12] ==================================================================
[ 16.668037][ T12] Disabling lock debugging due to kernel taint
[ 16.668502][ T12] ------------[ cut here ]------------
[ 16.668784][ T12] refcount_t: underflow; use-after-free.
[ 16.669082][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.669621][ T12] Modules linked in: veth
[ 16.669860][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.670524][ T12] Tainted: [B]=BAD_PAGE
[ 16.670796][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.671141][ T12] Workqueue: netns cleanup_net
[ 16.671460][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.671842][ T12] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d c5 9b e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 16.672927][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 16.673314][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.673801][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.674277][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff38be134
[ 16.674728][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 16.675207][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.675638][ T12] FS: 0000000000000000(0000) GS:ffff888098910000(0000) knlGS:0000000000000000
[ 16.676196][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.676584][ T12] CR2: 00007ff8d1ed51a0 CR3: 0000000009c77002 CR4: 0000000000772ef0
[ 16.677057][ T12] PKRU: 55555554
[ 16.677319][ T12] Call Trace:
[ 16.677569][ T12]
[ 16.677740][ T12] netdev_run_todo+0x5f0/0xc60
[ 16.678041][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 16.678382][ T12] ? generic_xdp_install+0x410/0x410
[ 16.678711][ T12] ops_undo_list+0x714/0x890
[ 16.679081][ T12] ? netns_get+0x110/0x110
[ 16.679430][ T12] ? cleanup_net+0x2d6/0x830
[ 16.679759][ T12] cleanup_net+0x3b2/0x830
[ 16.680081][ T12] ? net_passive_dec+0x190/0x190
[ 16.680416][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.680729][ T12] process_one_work+0xe35/0x1650
[ 16.681027][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.681350][ T12] ? assign_work+0x168/0x240
[ 16.681645][ T12] worker_thread+0x591/0xcf0
[ 16.681938][ T12] ? rescuer_thread+0xd10/0xd10
[ 16.682272][ T12] kthread+0x37b/0x5f0
[ 16.682495][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.682786][ T12] ? ret_from_fork+0x1b/0x270
[ 16.683076][ T12] ? __lock_release+0x5d/0x170
[ 16.683371][ T12] ? rcu_is_watching+0x12/0xb0
[ 16.683655][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.683948][ T12] ret_from_fork+0x1db/0x270
[ 16.684503][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.684805][ T12] ret_from_fork_asm+0x11/0x20
[ 16.685118][ T12]
[ 16.685363][ T12] irq event stamp: 2759
[ 16.685604][ T12] hardirqs last enabled at (2759): [] finish_task_switch.isra.0+0x245/0x960
[ 16.686358][ T12] hardirqs last disabled at (2758): [] __schedule+0x94a/0x1b10
[ 16.687026][ T12] softirqs last enabled at (2632): [] handle_softirqs+0x352/0x610
[ 16.687597][ T12] softirqs last disabled at (2625): [] irq_exit_rcu+0xab/0x100
[ 16.688101][ T12] ---[ end trace 0000000000000000 ]---