[ 50.491821][ T70] ==================================================================
[ 50.492158][ T70] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 50.492448][ T70] Read of size 1 at addr ffff8880051896ac by task kworker/u16:1/70
[ 50.492697][ T70]
[ 50.492784][ T70] CPU: 1 UID: 0 PID: 70 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 50.492789][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 50.492792][ T70] Workqueue: netns cleanup_net
[ 50.492806][ T70] Call Trace:
[ 50.492810][ T70]
[ 50.492814][ T70] dump_stack_lvl+0x82/0xc0
[ 50.492823][ T70] print_address_description.constprop.0+0x2c/0x3a0
[ 50.492842][ T70] ? kobject_put+0xbb/0xd0
[ 50.492847][ T70] print_report+0xb4/0x270
[ 50.492850][ T70] ? kobject_put+0xbb/0xd0
[ 50.492853][ T70] ? kasan_addr_to_slab+0x21/0x70
[ 50.492857][ T70] ? kobject_put+0xbb/0xd0
[ 50.492860][ T70] kasan_report+0xca/0x100
[ 50.492865][ T70] ? kobject_put+0xbb/0xd0
[ 50.492871][ T70] kobject_put+0xbb/0xd0
[ 50.492874][ T70] netdev_run_todo+0x5f0/0xc60
[ 50.492880][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 50.492884][ T70] ? generic_xdp_install+0x410/0x410
[ 50.492891][ T70] ops_undo_list+0x714/0x890
[ 50.492901][ T70] ? netns_get+0x110/0x110
[ 50.492905][ T70] ? cleanup_net+0x2d6/0x830
[ 50.492910][ T70] cleanup_net+0x3b2/0x830
[ 50.492915][ T70] ? net_passive_dec+0x190/0x190
[ 50.492919][ T70] ? rcu_is_watching+0x12/0xb0
[ 50.492933][ T70] process_one_work+0xe35/0x1650
[ 50.492946][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 50.492951][ T70] ? assign_work+0x168/0x240
[ 50.492955][ T70] worker_thread+0x591/0xcf0
[ 50.492961][ T70] ? rescuer_thread+0xd10/0xd10
[ 50.492965][ T70] kthread+0x37b/0x5f0
[ 50.492970][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.492973][ T70] ? ret_from_fork+0x1b/0x270
[ 50.492991][ T70] ? __lock_release+0x5d/0x170
[ 50.493000][ T70] ? rcu_is_watching+0x12/0xb0
[ 50.493003][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.493007][ T70] ret_from_fork+0x1db/0x270
[ 50.493010][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.493013][ T70] ret_from_fork_asm+0x11/0x20
[ 50.493029][ T70]
[ 50.493030][ T70]
[ 50.500042][ T70] Allocated by task 251:
[ 50.500174][ T70] kasan_save_stack+0x24/0x40
[ 50.500350][ T70] kasan_save_track+0x14/0x30
[ 50.500607][ T70] __kasan_kmalloc+0x7b/0x90
[ 50.500765][ T70] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 50.500930][ T70] alloc_netdev_mqs+0x7d/0x1370
[ 50.501140][ T70] sit_init_net+0x169/0x550
[ 50.501394][ T70] ops_init+0x189/0x550
[ 50.501515][ T70] setup_net+0xf1/0x380
[ 50.501639][ T70] copy_net_ns+0x21a/0x380
[ 50.501800][ T70] create_new_namespaces+0x35f/0x900
[ 50.502046][ T70] unshare_nsproxy_namespaces+0x89/0x120
[ 50.502202][ T70] ksys_unshare+0x2a3/0x660
[ 50.502358][ T70] __x64_sys_unshare+0x31/0x40
[ 50.502512][ T70] do_syscall_64+0xc1/0xfd0
[ 50.502764][ T70] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 50.502964][ T70]
[ 50.503050][ T70] Freed by task 70:
[ 50.503177][ T70] kasan_save_stack+0x24/0x40
[ 50.503342][ T70] kasan_save_track+0x14/0x30
[ 50.503588][ T70] __kasan_save_free_info+0x3b/0x60
[ 50.503742][ T70] __kasan_slab_free+0x3f/0x60
[ 50.503900][ T70] kfree+0x21d/0x540
[ 50.504016][ T70] device_release+0x9c/0x210
[ 50.504273][ T70] kobject_cleanup+0xfe/0x360
[ 50.504431][ T70] netdev_run_todo+0x81f/0xc60
[ 50.504596][ T70] ops_undo_list+0x714/0x890
[ 50.504763][ T70] cleanup_net+0x3b2/0x830
[ 50.505006][ T70] process_one_work+0xe35/0x1650
[ 50.505168][ T70] worker_thread+0x591/0xcf0
[ 50.505335][ T70] kthread+0x37b/0x5f0
[ 50.505452][ T70] ret_from_fork+0x1db/0x270
[ 50.505701][ T70] ret_from_fork_asm+0x11/0x20
[ 50.505860][ T70]
[ 50.505965][ T70] The buggy address belongs to the object at ffff888005189000
[ 50.505965][ T70] which belongs to the cache kmalloc-4k of size 4096
[ 50.506438][ T70] The buggy address is located 1708 bytes inside of
[ 50.506438][ T70] freed 4096-byte region [ffff888005189000, ffff88800518a000)
[ 50.506897][ T70]
[ 50.506975][ T70] The buggy address belongs to the physical page:
[ 50.507298][ T70] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5188
[ 50.507591][ T70] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 50.507832][ T70] flags: 0x80000000000040(head|node=0|zone=1)
[ 50.508143][ T70] page_type: f5(slab)
[ 50.508273][ T70] raw: 0080000000000040 ffff888001043700 ffffea0000200010 ffffea0000210210
[ 50.508591][ T70] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 50.508980][ T70] head: 0080000000000040 ffff888001043700 ffffea0000200010 ffffea0000210210
[ 50.509281][ T70] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 50.509661][ T70] head: 0080000000000003 ffffea0000146201 00000000ffffffff 00000000ffffffff
[ 50.509947][ T70] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 50.510369][ T70] page dumped because: kasan: bad access detected
[ 50.510579][ T70]
[ 50.510665][ T70] Memory state around the buggy address:
[ 50.510827][ T70] ffff888005189580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.511232][ T70] ffff888005189600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.511592][ T70] >ffff888005189680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.511886][ T70] ^
[ 50.512150][ T70] ffff888005189700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.512382][ T70] ffff888005189780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 50.512618][ T70] ==================================================================
[ 50.513091][ T70] Disabling lock debugging due to kernel taint
[ 50.513355][ T70] ------------[ cut here ]------------
[ 50.513520][ T70] refcount_t: underflow; use-after-free.
[ 50.513735][ T70] WARNING: CPU: 0 PID: 70 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 50.514067][ T70] Modules linked in: inet_diag nft_tproxy nf_tproxy_ipv6 nf_tproxy_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 50.514480][ T70] CPU: 0 UID: 0 PID: 70 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 50.514891][ T70] Tainted: [B]=BAD_PAGE
[ 50.515027][ T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 50.515248][ T70] Workqueue: netns cleanup_net
[ 50.515437][ T70] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 50.515661][ T70] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de e5 85 e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 50.516277][ T70] RSP: 0018:ffffc900004b7a08 EFLAGS: 00010282
[ 50.516501][ T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 50.516760][ T70] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 50.517032][ T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0cfe220
[ 50.517290][ T70] R10: 0000000000000003 R11: ffffc900004b7580 R12: 0000000000000001
[ 50.517542][ T70] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 50.517814][ T70] FS: 0000000000000000(0000) GS:ffff8880a8bec000(0000) knlGS:0000000000000000
[ 50.518114][ T70] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 50.518327][ T70] CR2: 00007ffcc973ca08 CR3: 000000000d91d002 CR4: 0000000000772ef0
[ 50.518586][ T70] PKRU: 55555554
[ 50.518715][ T70] Call Trace:
[ 50.518853][ T70]
[ 50.518950][ T70] netdev_run_todo+0x5f0/0xc60
[ 50.519124][ T70] ? dev_ingress_queue_create+0x190/0x190
[ 50.519296][ T70] ? generic_xdp_install+0x410/0x410
[ 50.519469][ T70] ops_undo_list+0x714/0x890
[ 50.519642][ T70] ? netns_get+0x110/0x110
[ 50.519821][ T70] ? cleanup_net+0x2d6/0x830
[ 50.519993][ T70] cleanup_net+0x3b2/0x830
[ 50.520172][ T70] ? net_passive_dec+0x190/0x190
[ 50.520343][ T70] ? rcu_is_watching+0x12/0xb0
[ 50.520520][ T70] process_one_work+0xe35/0x1650
[ 50.520698][ T70] ? pwq_dec_nr_in_flight+0x550/0x550
[ 50.520876][ T70] ? assign_work+0x168/0x240
[ 50.521051][ T70] worker_thread+0x591/0xcf0
[ 50.521222][ T70] ? rescuer_thread+0xd10/0xd10
[ 50.521390][ T70] kthread+0x37b/0x5f0
[ 50.521519][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.521689][ T70] ? ret_from_fork+0x1b/0x270
[ 50.521873][ T70] ? __lock_release+0x5d/0x170
[ 50.522052][ T70] ? rcu_is_watching+0x12/0xb0
[ 50.522222][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.522389][ T70] ret_from_fork+0x1db/0x270
[ 50.522558][ T70] ? kthread_is_per_cpu+0xc0/0xc0
[ 50.522725][ T70] ret_from_fork_asm+0x11/0x20
[ 50.522914][ T70]
[ 50.523046][ T70] irq event stamp: 8669
[ 50.523179][ T70] hardirqs last enabled at (8669): [] finish_task_switch.isra.0+0x245/0x960
[ 50.523514][ T70] hardirqs last disabled at (8668): [] __schedule+0x94a/0x1b10
[ 50.523839][ T70] softirqs last enabled at (7806): [] handle_softirqs+0x352/0x610
[ 50.524146][ T70] softirqs last disabled at (7801): [] irq_exit_rcu+0xab/0x100
[ 50.524440][ T70] ---[ end trace 0000000000000000 ]---