[ 67.261372][ T71] ==================================================================
[ 67.261804][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 67.262200][ T71] Read of size 1 at addr ffff8880059f469c by task kworker/u16:1/71
[ 67.262614][ T71]
[ 67.262772][ T71] CPU: 0 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 67.262780][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 67.262784][ T71] Workqueue: netns cleanup_net
[ 67.262797][ T71] Call Trace:
[ 67.262800][ T71]
[ 67.262803][ T71] dump_stack_lvl+0x82/0xc0
[ 67.262812][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 67.262827][ T71] ? kobject_put+0xbb/0xd0
[ 67.262833][ T71] print_report+0xb4/0x270
[ 67.262839][ T71] ? kobject_put+0xbb/0xd0
[ 67.262842][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 67.262848][ T71] ? kobject_put+0xbb/0xd0
[ 67.262853][ T71] kasan_report+0xca/0x100
[ 67.262860][ T71] ? kobject_put+0xbb/0xd0
[ 67.262869][ T71] kobject_put+0xbb/0xd0
[ 67.262875][ T71] netdev_run_todo+0x5f0/0xc60
[ 67.262885][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 67.262891][ T71] ? generic_xdp_install+0x410/0x410
[ 67.262902][ T71] ops_undo_list+0x714/0x890
[ 67.262911][ T71] ? netns_get+0x110/0x110
[ 67.262915][ T71] ? cleanup_net+0x2d6/0x830
[ 67.262924][ T71] cleanup_net+0x3b2/0x830
[ 67.262929][ T71] ? net_passive_dec+0x190/0x190
[ 67.262936][ T71] ? rcu_is_watching+0x12/0xb0
[ 67.262954][ T71] process_one_work+0xe35/0x1650
[ 67.262972][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 67.262984][ T71] ? assign_work+0x168/0x240
[ 67.262992][ T71] worker_thread+0x591/0xcf0
[ 67.263003][ T71] ? rescuer_thread+0xd10/0xd10
[ 67.263010][ T71] kthread+0x37b/0x5f0
[ 67.263017][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 67.263022][ T71] ? ret_from_fork+0x1b/0x270
[ 67.263032][ T71] ? __lock_release+0x5d/0x170
[ 67.263039][ T71] ? rcu_is_watching+0x12/0xb0
[ 67.263045][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 67.263052][ T71] ret_from_fork+0x1db/0x270
[ 67.263056][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 67.263061][ T71] ret_from_fork_asm+0x11/0x20
[ 67.263081][ T71]
[ 67.263083][ T71]
[ 67.272749][ T71] Allocated by task 242:
[ 67.272950][ T71] kasan_save_stack+0x24/0x40
[ 67.273225][ T71] kasan_save_track+0x14/0x30
[ 67.273483][ T71] __kasan_kmalloc+0x7b/0x90
[ 67.273760][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 67.274026][ T71] alloc_netdev_mqs+0x7d/0x1370
[ 67.274299][ T71] sit_init_net+0x169/0x550
[ 67.274570][ T71] ops_init+0x189/0x550
[ 67.274773][ T71] setup_net+0xf1/0x380
[ 67.274972][ T71] copy_net_ns+0x21a/0x380
[ 67.275246][ T71] create_new_namespaces+0x35f/0x900
[ 67.275520][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 67.275784][ T71] ksys_unshare+0x2a3/0x660
[ 67.276047][ T71] __x64_sys_unshare+0x31/0x40
[ 67.276323][ T71] do_syscall_64+0xc1/0xfd0
[ 67.276605][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 67.276939][ T71]
[ 67.277078][ T71] Freed by task 71:
[ 67.277281][ T71] kasan_save_stack+0x24/0x40
[ 67.277559][ T71] kasan_save_track+0x14/0x30
[ 67.277818][ T71] __kasan_save_free_info+0x3b/0x60
[ 67.278082][ T71] __kasan_slab_free+0x3f/0x60
[ 67.278341][ T71] kfree+0x21d/0x540
[ 67.278533][ T71] device_release+0x9c/0x210
[ 67.278799][ T71] kobject_cleanup+0xfe/0x360
[ 67.279064][ T71] netdev_run_todo+0x81f/0xc60
[ 67.279333][ T71] ops_undo_list+0x714/0x890
[ 67.279609][ T71] cleanup_net+0x3b2/0x830
[ 67.279898][ T71] process_one_work+0xe35/0x1650
[ 67.280164][ T71] worker_thread+0x591/0xcf0
[ 67.280422][ T71] kthread+0x37b/0x5f0
[ 67.280648][ T71] ret_from_fork+0x1db/0x270
[ 67.280915][ T71] ret_from_fork_asm+0x11/0x20
[ 67.281205][ T71]
[ 67.281347][ T71] The buggy address belongs to the object at ffff8880059f4000
[ 67.281347][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 67.282012][ T71] The buggy address is located 1692 bytes inside of
[ 67.282012][ T71] freed 4096-byte region [ffff8880059f4000, ffff8880059f5000)
[ 67.282494][ T71]
[ 67.282582][ T71] The buggy address belongs to the physical page:
[ 67.282822][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x59f0
[ 67.283133][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 67.283416][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 67.283626][ T71] page_type: f5(slab)
[ 67.283794][ T71] raw: 0080000000000040 ffff888001043700 ffffea00003e3e10 ffffea00000a5e10
[ 67.284089][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 67.284378][ T71] head: 0080000000000040 ffff888001043700 ffffea00003e3e10 ffffea00000a5e10
[ 67.284675][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 67.284970][ T71] head: 0080000000000003 ffffea0000167c01 00000000ffffffff 00000000ffffffff
[ 67.285257][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 67.285538][ T71] page dumped because: kasan: bad access detected
[ 67.285751][ T71]
[ 67.285834][ T71] Memory state around the buggy address:
[ 67.285989][ T71] ffff8880059f4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 67.286221][ T71] ffff8880059f4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 67.286457][ T71] >ffff8880059f4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 67.286738][ T71] ^
[ 67.286955][ T71] ffff8880059f4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 67.287185][ T71] ffff8880059f4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 67.287413][ T71] ==================================================================
[ 67.287780][ T71] Disabling lock debugging due to kernel taint
[ 67.288011][ T71] ------------[ cut here ]------------
[ 67.288170][ T71] refcount_t: underflow; use-after-free.
[ 67.288383][ T71] WARNING: CPU: 3 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 67.288824][ T71] Modules linked in: tcp_diag mptcp_diag inet_diag
[ 67.289053][ T71] CPU: 3 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 67.289422][ T71] Tainted: [B]=BAD_PAGE
[ 67.289543][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 67.289746][ T71] Workqueue: netns cleanup_net
[ 67.289937][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 67.290152][ T71] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d 05 90 e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 67.290706][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 67.290962][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 67.291208][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 67.291502][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2142934
[ 67.291795][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 67.292031][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 67.292348][ T71] FS: 0000000000000000(0000) GS:ffff8880a4504000(0000) knlGS:0000000000000000
[ 67.292787][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 67.293035][ T71] CR2: 00007f88fdf6ef73 CR3: 000000000a759004 CR4: 0000000000772ef0
[ 67.293320][ T71] PKRU: 55555554
[ 67.293452][ T71] Call Trace:
[ 67.293607][ T71]
[ 67.293709][ T71] netdev_run_todo+0x5f0/0xc60
[ 67.293917][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 67.294101][ T71] ? generic_xdp_install+0x410/0x410
[ 67.294283][ T71] ops_undo_list+0x714/0x890
[ 67.294488][ T71] ? netns_get+0x110/0x110
[ 67.294653][ T71] ? cleanup_net+0x2d6/0x830
[ 67.294855][ T71] cleanup_net+0x3b2/0x830
[ 67.295028][ T71] ? net_passive_dec+0x190/0x190
[ 67.295227][ T71] ? rcu_is_watching+0x12/0xb0
[ 67.295420][ T71] process_one_work+0xe35/0x1650
[ 67.295636][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 67.295805][ T71] ? assign_work+0x168/0x240
[ 67.296008][ T71] worker_thread+0x591/0xcf0
[ 67.296176][ T71] ? rescuer_thread+0xd10/0xd10
[ 67.296373][ T71] kthread+0x37b/0x5f0
[ 67.296521][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 67.296687][ T71] ? ret_from_fork+0x1b/0x270
[ 67.296894][ T71] ? __lock_release+0x5d/0x170
[ 67.297063][ T71] ? rcu_is_watching+0x12/0xb0
[ 67.297271][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 67.297471][ T71] ret_from_fork+0x1db/0x270
[ 67.297641][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 67.297806][ T71] ret_from_fork_asm+0x11/0x20
[ 67.297980][ T71]
[ 67.298108][ T71] irq event stamp: 2681
[ 67.298238][ T71] hardirqs last enabled at (2681): [] finish_task_switch.isra.0+0x245/0x960
[ 67.298582][ T71] hardirqs last disabled at (2680): [] __schedule+0x94a/0x1b10
[ 67.298881][ T71] softirqs last enabled at (2552): [] handle_softirqs+0x352/0x610
[ 67.299170][ T71] softirqs last disabled at (2545): [] irq_exit_rcu+0xab/0x100
[ 67.299466][ T71] ---[ end trace 0000000000000000 ]---