[ 15.071560][ T70] ==================================================================
[ 15.071917][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 15.072180][ T70] Read of size 1 at addr ffff8880052dc694 by task kworker/u16:1/70
[ 15.072442][ T70]
[ 15.072531][ T70] CPU: 1 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.072536][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.072540][ T70] Workqueue: netns cleanup_net
[ 15.072546][ T70] Call Trace:
[ 15.072548][ T70]
[ 15.072551][ T70] dump_stack_lvl+0x82/0xc0
[ 15.072557][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 15.072564][ T70] ? kobject_put+0xbb/0xd0
[ 15.072567][ T70] print_report+0xb4/0x270
[ 15.072571][ T70] ? kobject_put+0xbb/0xd0
[ 15.072574][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 15.072577][ T70] ? kobject_put+0xbb/0xd0
[ 15.072580][ T70] kasan_report+0xca/0x100
[ 15.072584][ T70] ? kobject_put+0xbb/0xd0
[ 15.072589][ T70] kobject_put+0xbb/0xd0
[ 15.072592][ T70] netdev_run_todo+0x5f0/0xc60
[ 15.072598][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 15.072602][ T70] ? generic_xdp_install+0x410/0x410
[ 15.072608][ T70] ops_undo_list+0x714/0x890
[ 15.072612][ T70] ? netns_get+0x110/0x110
[ 15.072614][ T70] ? cleanup_net+0x2d6/0x830
[ 15.072619][ T70] cleanup_net+0x3b2/0x830
[ 15.072623][ T70] ? net_passive_dec+0x190/0x190
[ 15.072626][ T70] ? rcu_is_watching+0x12/0xb0
[ 15.072632][ T70] process_one_work+0xe35/0x1650
[ 15.072639][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.072645][ T70] ? assign_work+0x168/0x240
[ 15.072648][ T70] worker_thread+0x591/0xcf0
[ 15.072653][ T70] ? rescuer_thread+0xd10/0xd10
[ 15.072657][ T70] kthread+0x37b/0x5f0
[ 15.072660][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.072662][ T70] ? ret_from_fork+0x1b/0x270
[ 15.072667][ T70] ? __lock_release+0x5d/0x170
[ 15.072672][ T70] ? rcu_is_watching+0x12/0xb0
[ 15.072675][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.072678][ T70] ret_from_fork+0x1db/0x270
[ 15.072681][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.072683][ T70] ret_from_fork_asm+0x11/0x20
[ 15.072691][ T70]
[ 15.072692][ T70]
[ 15.080025][ T70] Allocated by task 229:
[ 15.080224][ T70] kasan_save_stack+0x24/0x40
[ 15.080438][ T70] kasan_save_track+0x14/0x30
[ 15.080631][ T70] __kasan_kmalloc+0x7b/0x90
[ 15.080820][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 15.081010][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 15.081197][ T70] sit_init_net+0x169/0x550
[ 15.081388][ T70] ops_init+0x189/0x550
[ 15.081535][ T70] setup_net+0xf1/0x380
[ 15.081677][ T70] copy_net_ns+0x21a/0x380
[ 15.081867][ T70] create_new_namespaces+0x35f/0x900
[ 15.082059][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 15.082246][ T70] ksys_unshare+0x2a3/0x660
[ 15.082454][ T70] __x64_sys_unshare+0x31/0x40
[ 15.082640][ T70] do_syscall_64+0xc1/0xfd0
[ 15.082896][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.083134][ T70]
[ 15.083228][ T70] Freed by task 70:
[ 15.083371][ T70] kasan_save_stack+0x24/0x40
[ 15.083620][ T70] kasan_save_track+0x14/0x30
[ 15.083809][ T70] __kasan_save_free_info+0x3b/0x60
[ 15.084000][ T70] __kasan_slab_free+0x3f/0x60
[ 15.084206][ T70] kfree+0x21d/0x540
[ 15.084378][ T70] device_release+0x9c/0x210
[ 15.084573][ T70] kobject_cleanup+0xfe/0x360
[ 15.084758][ T70] netdev_run_todo+0x81f/0xc60
[ 15.084947][ T70] ops_undo_list+0x714/0x890
[ 15.085135][ T70] cleanup_net+0x3b2/0x830
[ 15.085391][ T70] process_one_work+0xe35/0x1650
[ 15.085582][ T70] worker_thread+0x591/0xcf0
[ 15.085814][ T70] kthread+0x37b/0x5f0
[ 15.085985][ T70] ret_from_fork+0x1db/0x270
[ 15.086172][ T70] ret_from_fork_asm+0x11/0x20
[ 15.086357][ T70]
[ 15.086495][ T70] The buggy address belongs to the object at ffff8880052dc000
[ 15.086495][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 15.087053][ T70] The buggy address is located 1684 bytes inside of
[ 15.087053][ T70] freed 4096-byte region [ffff8880052dc000, ffff8880052dd000)
[ 15.087539][ T70]
[ 15.087718][ T70] The buggy address belongs to the physical page:
[ 15.087943][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x52d8
[ 15.088330][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 15.088724][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 15.088959][ T70] page_type: f5(slab)
[ 15.089101][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000224a10 ffffea00003cb010
[ 15.089533][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.089857][ T70] head: 0080000000000040 ffff888001043700 ffffea0000224a10 ffffea00003cb010
[ 15.090296][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 15.090738][ T70] head: 0080000000000003 ffffea000014b601 00000000ffffffff 00000000ffffffff
[ 15.091100][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.091632][ T70] page dumped because: kasan: bad access detected
[ 15.091875][ T70]
[ 15.091967][ T70] Memory state around the buggy address:
[ 15.092316][ T70] ffff8880052dc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.092666][ T70] ffff8880052dc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.092931][ T70] >ffff8880052dc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.093282][ T70] ^
[ 15.093472][ T70] ffff8880052dc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.093802][ T70] ffff8880052dc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 15.094212][ T70] ==================================================================
[ 15.094581][ T70] Disabling lock debugging due to kernel taint
[ 15.094947][ T70] ------------[ cut here ]------------
[ 15.095119][ T70] refcount_t: underflow; use-after-free.
[ 15.095363][ T70] WARNING: CPU: 2 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.095684][ T70] Modules linked in: veth
[ 15.095841][ T70] CPU: 2 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.096220][ T70] Tainted: [B]=BAD_PAGE
[ 15.096376][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.096604][ T70] Workqueue: netns cleanup_net
[ 15.096807][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.097034][ T70] 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
[ 15.097661][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 15.097913][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.098190][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.098474][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff38be134
[ 15.098767][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 15.099047][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.099338][ T70] FS: 0000000000000000(0000) GS:ffff888098910000(0000) knlGS:0000000000000000
[ 15.099736][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.099956][ T70] CR2: 00007f89e92bc000 CR3: 0000000008fe6004 CR4: 0000000000772ef0
[ 15.100215][ T70] PKRU: 55555554
[ 15.100369][ T70] Call Trace:
[ 15.100518][ T70]
[ 15.100629][ T70] netdev_run_todo+0x5f0/0xc60
[ 15.100816][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 15.100996][ T70] ? generic_xdp_install+0x410/0x410
[ 15.101272][ T70] ops_undo_list+0x714/0x890
[ 15.101470][ T70] ? netns_get+0x110/0x110
[ 15.101670][ T70] ? cleanup_net+0x2d6/0x830
[ 15.101866][ T70] cleanup_net+0x3b2/0x830
[ 15.102152][ T70] ? net_passive_dec+0x190/0x190
[ 15.102346][ T70] ? rcu_is_watching+0x12/0xb0
[ 15.102529][ T70] process_one_work+0xe35/0x1650
[ 15.102719][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 15.102980][ T70] ? assign_work+0x168/0x240
[ 15.103164][ T70] worker_thread+0x591/0xcf0
[ 15.103357][ T70] ? rescuer_thread+0xd10/0xd10
[ 15.103534][ T70] kthread+0x37b/0x5f0
[ 15.103788][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.103964][ T70] ? ret_from_fork+0x1b/0x270
[ 15.104142][ T70] ? __lock_release+0x5d/0x170
[ 15.104327][ T70] ? rcu_is_watching+0x12/0xb0
[ 15.104592][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.104773][ T70] ret_from_fork+0x1db/0x270
[ 15.104950][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 15.105132][ T70] ret_from_fork_asm+0x11/0x20
[ 15.105332][ T70]
[ 15.105574][ T70] irq event stamp: 2595
[ 15.105741][ T70] hardirqs last enabled at (2595): [] finish_task_switch.isra.0+0x245/0x960
[ 15.106083][ T70] hardirqs last disabled at (2594): [] __schedule+0x94a/0x1b10
[ 15.106477][ T70] softirqs last enabled at (2492): [] handle_softirqs+0x352/0x610
[ 15.106794][ T70] softirqs last disabled at (2485): [] irq_exit_rcu+0xab/0x100
[ 15.107094][ T70] ---[ end trace 0000000000000000 ]---