[ 16.829013][ T70] ==================================================================
[ 16.829490][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.829878][ T70] Read of size 1 at addr ffff88800a579694 by task kworker/u16:1/70
[ 16.830178][ T70]
[ 16.830323][ T70] CPU: 3 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.830330][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.830334][ T70] Workqueue: netns cleanup_net
[ 16.830343][ T70] Call Trace:
[ 16.830346][ T70]
[ 16.830349][ T70] dump_stack_lvl+0x82/0xc0
[ 16.830356][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 16.830365][ T70] ? kobject_put+0xbb/0xd0
[ 16.830369][ T70] print_report+0xb4/0x270
[ 16.830372][ T70] ? kobject_put+0xbb/0xd0
[ 16.830375][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 16.830379][ T70] ? kobject_put+0xbb/0xd0
[ 16.830382][ T70] kasan_report+0xca/0x100
[ 16.830386][ T70] ? kobject_put+0xbb/0xd0
[ 16.830391][ T70] kobject_put+0xbb/0xd0
[ 16.830395][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.830402][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.830406][ T70] ? generic_xdp_install+0x410/0x410
[ 16.830413][ T70] ops_undo_list+0x714/0x890
[ 16.830417][ T70] ? netns_get+0x110/0x110
[ 16.830419][ T70] ? cleanup_net+0x2d6/0x830
[ 16.830424][ T70] cleanup_net+0x3b2/0x830
[ 16.830427][ T70] ? net_passive_dec+0x190/0x190
[ 16.830431][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.830437][ T70] process_one_work+0xe35/0x1650
[ 16.830445][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.830450][ T70] ? assign_work+0x168/0x240
[ 16.830454][ T70] worker_thread+0x591/0xcf0
[ 16.830459][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.830462][ T70] kthread+0x37b/0x5f0
[ 16.830466][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.830468][ T70] ? ret_from_fork+0x1b/0x270
[ 16.830475][ T70] ? __lock_release+0x5d/0x170
[ 16.830484][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.830488][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.830493][ T70] ret_from_fork+0x1db/0x270
[ 16.830498][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.830500][ T70] ret_from_fork_asm+0x11/0x20
[ 16.830509][ T70]
[ 16.830510][ T70]
[ 16.838287][ T70] Allocated by task 229:
[ 16.838418][ T70] kasan_save_stack+0x24/0x40
[ 16.838610][ T70] kasan_save_track+0x14/0x30
[ 16.838827][ T70] __kasan_kmalloc+0x7b/0x90
[ 16.839000][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.839207][ T70] alloc_netdev_mqs+0x7d/0x1310
[ 16.839398][ T70] sit_init_net+0x169/0x550
[ 16.839656][ T70] ops_init+0x189/0x550
[ 16.839789][ T70] setup_net+0xf1/0x380
[ 16.839955][ T70] copy_net_ns+0x21a/0x380
[ 16.840137][ T70] create_new_namespaces+0x35f/0x900
[ 16.840343][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 16.840536][ T70] ksys_unshare+0x2a3/0x660
[ 16.840745][ T70] __x64_sys_unshare+0x31/0x40
[ 16.840962][ T70] do_syscall_64+0xc1/0xfd0
[ 16.841156][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.841439][ T70]
[ 16.841534][ T70] Freed by task 70:
[ 16.841691][ T70] kasan_save_stack+0x24/0x40
[ 16.841897][ T70] kasan_save_track+0x14/0x30
[ 16.842091][ T70] __kasan_save_free_info+0x3b/0x60
[ 16.842297][ T70] __kasan_slab_free+0x3f/0x60
[ 16.842499][ T70] kfree+0x21d/0x540
[ 16.842654][ T70] device_release+0x9c/0x210
[ 16.842866][ T70] kobject_cleanup+0xfe/0x360
[ 16.843057][ T70] netdev_run_todo+0x81f/0xc60
[ 16.843270][ T70] ops_undo_list+0x714/0x890
[ 16.843449][ T70] cleanup_net+0x3b2/0x830
[ 16.843640][ T70] process_one_work+0xe35/0x1650
[ 16.843870][ T70] worker_thread+0x591/0xcf0
[ 16.844064][ T70] kthread+0x37b/0x5f0
[ 16.844210][ T70] ret_from_fork+0x1db/0x270
[ 16.844390][ T70] ret_from_fork_asm+0x11/0x20
[ 16.844575][ T70]
[ 16.844666][ T70] The buggy address belongs to the object at ffff88800a579000
[ 16.844666][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 16.845152][ T70] The buggy address is located 1684 bytes inside of
[ 16.845152][ T70] freed 4096-byte region [ffff88800a579000, ffff88800a57a000)
[ 16.845615][ T70]
[ 16.845707][ T70] The buggy address belongs to the physical page:
[ 16.845935][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa578
[ 16.846284][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.846561][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.846789][ T70] page_type: f5(slab)
[ 16.846935][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000166a10 ffffea0000165610
[ 16.847339][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.847663][ T70] head: 0080000000000040 ffff888001043700 ffffea0000166a10 ffffea0000165610
[ 16.847987][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.848328][ T70] head: 0080000000000003 ffffea0000295e01 00000000ffffffff 00000000ffffffff
[ 16.848696][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.849040][ T70] page dumped because: kasan: bad access detected
[ 16.849280][ T70]
[ 16.849389][ T70] Memory state around the buggy address:
[ 16.849588][ T70] ffff88800a579580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.849853][ T70] ffff88800a579600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.850150][ T70] >ffff88800a579680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.850414][ T70] ^
[ 16.850622][ T70] ffff88800a579700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.850891][ T70] ffff88800a579780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.851168][ T70] ==================================================================
[ 16.851465][ T70] Disabling lock debugging due to kernel taint
[ 16.851693][ T70] ------------[ cut here ]------------
[ 16.851878][ T70] refcount_t: underflow; use-after-free.
[ 16.852094][ T70] WARNING: CPU: 3 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.852431][ T70] Modules linked in: veth
[ 16.852596][ T70] CPU: 3 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.853031][ T70] Tainted: [B]=BAD_PAGE
[ 16.853175][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.853406][ T70] Workqueue: netns cleanup_net
[ 16.853611][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.853847][ 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 65 a1 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
[ 16.854497][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 16.854724][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.855012][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.855295][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff43fe134
[ 16.855588][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 16.855871][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.856160][ T70] FS: 0000000000000000(0000) GS:ffff88808d390000(0000) knlGS:0000000000000000
[ 16.856484][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.856717][ T70] CR2: 00007f2ef8edd100 CR3: 0000000004c9f006 CR4: 0000000000772ef0
[ 16.857033][ T70] PKRU: 55555554
[ 16.857268][ T70] Call Trace:
[ 16.857412][ T70]
[ 16.857519][ T70] netdev_run_todo+0x5f0/0xc60
[ 16.857712][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 16.857927][ T70] ? generic_xdp_install+0x410/0x410
[ 16.858127][ T70] ops_undo_list+0x714/0x890
[ 16.858317][ T70] ? netns_get+0x110/0x110
[ 16.858506][ T70] ? cleanup_net+0x2d6/0x830
[ 16.858708][ T70] cleanup_net+0x3b2/0x830
[ 16.858894][ T70] ? net_passive_dec+0x190/0x190
[ 16.859085][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.859274][ T70] process_one_work+0xe35/0x1650
[ 16.859461][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.859657][ T70] ? assign_work+0x168/0x240
[ 16.859850][ T70] worker_thread+0x591/0xcf0
[ 16.860035][ T70] ? rescuer_thread+0xd10/0xd10
[ 16.860244][ T70] kthread+0x37b/0x5f0
[ 16.860387][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.860574][ T70] ? ret_from_fork+0x1b/0x270
[ 16.860764][ T70] ? __lock_release+0x5d/0x170
[ 16.860974][ T70] ? rcu_is_watching+0x12/0xb0
[ 16.861174][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.861351][ T70] ret_from_fork+0x1db/0x270
[ 16.861551][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.861738][ T70] ret_from_fork_asm+0x11/0x20
[ 16.861937][ T70]
[ 16.862193][ T70] irq event stamp: 2597
[ 16.862335][ T70] hardirqs last enabled at (2597): [] irqentry_exit+0x3b/0x80
[ 16.862679][ T70] hardirqs last disabled at (2596): [] handle_softirqs+0x47f/0x610
[ 16.863121][ T70] softirqs last enabled at (2488): [] handle_softirqs+0x352/0x610
[ 16.863450][ T70] softirqs last disabled at (2483): [] irq_exit_rcu+0xab/0x100
[ 16.863862][ T70] ---[ end trace 0000000000000000 ]---