[ 14.836313][ T71] ==================================================================
[ 14.836784][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.837187][ T71] Read of size 1 at addr ffff8880057f9694 by task kworker/u16:1/71
[ 14.837515][ T71]
[ 14.837629][ T71] CPU: 1 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.837637][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.837642][ T71] Workqueue: netns cleanup_net
[ 14.837652][ T71] Call Trace:
[ 14.837655][ T71]
[ 14.837659][ T71] dump_stack_lvl+0x82/0xc0
[ 14.837669][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 14.837680][ T71] ? kobject_put+0xbb/0xd0
[ 14.837686][ T71] print_report+0xb4/0x270
[ 14.837690][ T71] ? kobject_put+0xbb/0xd0
[ 14.837694][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 14.837699][ T71] ? kobject_put+0xbb/0xd0
[ 14.837703][ T71] kasan_report+0xca/0x100
[ 14.837709][ T71] ? kobject_put+0xbb/0xd0
[ 14.837716][ T71] kobject_put+0xbb/0xd0
[ 14.837720][ T71] netdev_run_todo+0x5f0/0xc60
[ 14.837728][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 14.837734][ T71] ? generic_xdp_install+0x410/0x410
[ 14.837743][ T71] ops_undo_list+0x714/0x890
[ 14.837749][ T71] ? netns_get+0x110/0x110
[ 14.837752][ T71] ? cleanup_net+0x2d6/0x830
[ 14.837759][ T71] cleanup_net+0x3b2/0x830
[ 14.837764][ T71] ? net_passive_dec+0x190/0x190
[ 14.837770][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.837777][ T71] process_one_work+0xe35/0x1650
[ 14.837787][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.837794][ T71] ? assign_work+0x168/0x240
[ 14.837799][ T71] worker_thread+0x591/0xcf0
[ 14.837806][ T71] ? rescuer_thread+0xd10/0xd10
[ 14.837810][ T71] kthread+0x37b/0x5f0
[ 14.837815][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.837818][ T71] ? ret_from_fork+0x1b/0x270
[ 14.837825][ T71] ? __lock_release+0x5d/0x170
[ 14.837832][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.837836][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.837840][ T71] ret_from_fork+0x1db/0x270
[ 14.837844][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.837847][ T71] ret_from_fork_asm+0x11/0x20
[ 14.837859][ T71]
[ 14.837861][ T71]
[ 14.847300][ T71] Allocated by task 228:
[ 14.847465][ T71] kasan_save_stack+0x24/0x40
[ 14.847696][ T71] kasan_save_track+0x14/0x30
[ 14.847918][ T71] __kasan_kmalloc+0x7b/0x90
[ 14.848177][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.848409][ T71] alloc_netdev_mqs+0x7d/0x1310
[ 14.848631][ T71] sit_init_net+0x169/0x550
[ 14.848870][ T71] ops_init+0x189/0x550
[ 14.849026][ T71] setup_net+0xf1/0x380
[ 14.849198][ T71] copy_net_ns+0x21a/0x380
[ 14.849397][ T71] create_new_namespaces+0x35f/0x900
[ 14.849607][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 14.849816][ T71] ksys_unshare+0x2a3/0x660
[ 14.850074][ T71] __x64_sys_unshare+0x31/0x40
[ 14.850325][ T71] do_syscall_64+0xc1/0xfd0
[ 14.850549][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.850821][ T71]
[ 14.850935][ T71] Freed by task 71:
[ 14.851089][ T71] kasan_save_stack+0x24/0x40
[ 14.851315][ T71] kasan_save_track+0x14/0x30
[ 14.851529][ T71] __kasan_save_free_info+0x3b/0x60
[ 14.851744][ T71] __kasan_slab_free+0x3f/0x60
[ 14.851976][ T71] kfree+0x21d/0x540
[ 14.852155][ T71] device_release+0x9c/0x210
[ 14.852374][ T71] kobject_cleanup+0xfe/0x360
[ 14.852586][ T71] netdev_run_todo+0x81f/0xc60
[ 14.852803][ T71] ops_undo_list+0x714/0x890
[ 14.853025][ T71] cleanup_net+0x3b2/0x830
[ 14.853231][ T71] process_one_work+0xe35/0x1650
[ 14.853431][ T71] worker_thread+0x591/0xcf0
[ 14.853637][ T71] kthread+0x37b/0x5f0
[ 14.853796][ T71] ret_from_fork+0x1db/0x270
[ 14.854022][ T71] ret_from_fork_asm+0x11/0x20
[ 14.854235][ T71]
[ 14.854355][ T71] The buggy address belongs to the object at ffff8880057f9000
[ 14.854355][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 14.854848][ T71] The buggy address is located 1684 bytes inside of
[ 14.854848][ T71] freed 4096-byte region [ffff8880057f9000, ffff8880057fa000)
[ 14.855373][ T71]
[ 14.855486][ T71] The buggy address belongs to the physical page:
[ 14.855744][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x57f8
[ 14.856145][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.856460][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.856729][ T71] page_type: f5(slab)
[ 14.856909][ T71] raw: 0080000000000040 ffff888001043700 ffffea0000225a10 ffffea00001e3210
[ 14.857306][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.857664][ T71] head: 0080000000000040 ffff888001043700 ffffea0000225a10 ffffea00001e3210
[ 14.858052][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.858453][ T71] head: 0080000000000003 ffffea000015fe01 00000000ffffffff 00000000ffffffff
[ 14.858820][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.859182][ T71] page dumped because: kasan: bad access detected
[ 14.859460][ T71]
[ 14.859562][ T71] Memory state around the buggy address:
[ 14.859762][ T71] ffff8880057f9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.860079][ T71] ffff8880057f9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.860412][ T71] >ffff8880057f9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.860704][ T71] ^
[ 14.860937][ T71] ffff8880057f9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.861235][ T71] ffff8880057f9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.861531][ T71] ==================================================================
[ 14.862025][ T71] Disabling lock debugging due to kernel taint
[ 14.862359][ T71] ------------[ cut here ]------------
[ 14.862549][ T71] refcount_t: underflow; use-after-free.
[ 14.862783][ T71] WARNING: CPU: 2 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.863160][ T71] Modules linked in: veth
[ 14.863327][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.863834][ T71] Tainted: [B]=BAD_PAGE
[ 14.864007][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.864256][ T71] Workqueue: netns cleanup_net
[ 14.864481][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.864753][ T71] 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 05 bc 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
[ 14.865428][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 14.865695][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.865995][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.866272][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff793e134
[ 14.866557][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 14.866859][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.867180][ T71] FS: 0000000000000000(0000) GS:ffff888078510000(0000) knlGS:0000000000000000
[ 14.867512][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.867776][ T71] CR2: 000055fcc9a1da08 CR3: 00000000092c6003 CR4: 0000000000772ef0
[ 14.868071][ T71] PKRU: 55555554
[ 14.868238][ T71] Call Trace:
[ 14.868395][ T71]
[ 14.868512][ T71] netdev_run_todo+0x5f0/0xc60
[ 14.868742][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 14.868942][ T71] ? generic_xdp_install+0x410/0x410
[ 14.869143][ T71] ops_undo_list+0x714/0x890
[ 14.869353][ T71] ? netns_get+0x110/0x110
[ 14.869543][ T71] ? cleanup_net+0x2d6/0x830
[ 14.869837][ T71] cleanup_net+0x3b2/0x830
[ 14.870039][ T71] ? net_passive_dec+0x190/0x190
[ 14.870245][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.870529][ T71] process_one_work+0xe35/0x1650
[ 14.870826][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.871034][ T71] ? assign_work+0x168/0x240
[ 14.871233][ T71] worker_thread+0x591/0xcf0
[ 14.871432][ T71] ? rescuer_thread+0xd10/0xd10
[ 14.871637][ T71] kthread+0x37b/0x5f0
[ 14.871791][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.872004][ T71] ? ret_from_fork+0x1b/0x270
[ 14.872200][ T71] ? __lock_release+0x5d/0x170
[ 14.872401][ T71] ? rcu_is_watching+0x12/0xb0
[ 14.872699][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.872896][ T71] ret_from_fork+0x1db/0x270
[ 14.873100][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.873315][ T71] ret_from_fork_asm+0x11/0x20
[ 14.873521][ T71]
[ 14.873699][ T71] irq event stamp: 2891
[ 14.873856][ T71] hardirqs last enabled at (2891): [] finish_task_switch.isra.0+0x245/0x960
[ 14.874399][ T71] hardirqs last disabled at (2890): [] __schedule+0x94a/0x1b10
[ 14.874740][ T71] softirqs last enabled at (2666): [] handle_softirqs+0x352/0x610
[ 14.875166][ T71] softirqs last disabled at (2605): [] irq_exit_rcu+0xab/0x100
[ 14.875498][ T71] ---[ end trace 0000000000000000 ]---