[ 31.852266][ T12] ==================================================================
[ 31.852583][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 31.852871][ T12] Read of size 1 at addr ffff888008fd469c by task kworker/u16:0/12
[ 31.853130][ T12]
[ 31.853224][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 31.853230][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 31.853234][ T12] Workqueue: netns cleanup_net
[ 31.853244][ T12] Call Trace:
[ 31.853246][ T12]
[ 31.853250][ T12] dump_stack_lvl+0x82/0xc0
[ 31.853255][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 31.853263][ T12] ? kobject_put+0xbb/0xd0
[ 31.853267][ T12] print_report+0xb4/0x270
[ 31.853270][ T12] ? kobject_put+0xbb/0xd0
[ 31.853273][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 31.853277][ T12] ? kobject_put+0xbb/0xd0
[ 31.853280][ T12] kasan_report+0xca/0x100
[ 31.853284][ T12] ? kobject_put+0xbb/0xd0
[ 31.853289][ T12] kobject_put+0xbb/0xd0
[ 31.853292][ T12] netdev_run_todo+0x5f0/0xc60
[ 31.853298][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 31.853301][ T12] ? generic_xdp_install+0x410/0x410
[ 31.853307][ T12] ops_undo_list+0x714/0x890
[ 31.853312][ T12] ? netns_get+0x110/0x110
[ 31.853315][ T12] ? cleanup_net+0x2d6/0x830
[ 31.853320][ T12] cleanup_net+0x3b2/0x830
[ 31.853324][ T12] ? net_passive_dec+0x190/0x190
[ 31.853328][ T12] ? rcu_is_watching+0x12/0xb0
[ 31.853337][ T12] process_one_work+0xe35/0x1650
[ 31.853347][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 31.853353][ T12] ? assign_work+0x168/0x240
[ 31.853358][ T12] worker_thread+0x591/0xcf0
[ 31.853364][ T12] ? rescuer_thread+0xd10/0xd10
[ 31.853368][ T12] kthread+0x37b/0x5f0
[ 31.853373][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 31.853376][ T12] ? ret_from_fork+0x1b/0x270
[ 31.853381][ T12] ? __lock_release+0x5d/0x170
[ 31.853387][ T12] ? rcu_is_watching+0x12/0xb0
[ 31.853390][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 31.853394][ T12] ret_from_fork+0x1db/0x270
[ 31.853397][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 31.853400][ T12] ret_from_fork_asm+0x11/0x20
[ 31.853412][ T12]
[ 31.853413][ T12]
[ 31.860159][ T12] Allocated by task 260:
[ 31.860293][ T12] kasan_save_stack+0x24/0x40
[ 31.860475][ T12] kasan_save_track+0x14/0x30
[ 31.860657][ T12] __kasan_kmalloc+0x7b/0x90
[ 31.860834][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 31.861011][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 31.861191][ T12] sit_init_net+0x169/0x550
[ 31.861374][ T12] ops_init+0x189/0x550
[ 31.861510][ T12] setup_net+0xf1/0x380
[ 31.861644][ T12] copy_net_ns+0x21a/0x380
[ 31.861818][ T12] create_new_namespaces+0x35f/0x900
[ 31.861996][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 31.862169][ T12] ksys_unshare+0x2a3/0x660
[ 31.862349][ T12] __x64_sys_unshare+0x31/0x40
[ 31.862523][ T12] do_syscall_64+0xc1/0xfd0
[ 31.862703][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 31.862924][ T12]
[ 31.863013][ T12] Freed by task 12:
[ 31.863150][ T12] kasan_save_stack+0x24/0x40
[ 31.863332][ T12] kasan_save_track+0x14/0x30
[ 31.863509][ T12] __kasan_save_free_info+0x3b/0x60
[ 31.863692][ T12] __kasan_slab_free+0x3f/0x60
[ 31.863869][ T12] kfree+0x21d/0x540
[ 31.864007][ T12] device_release+0x9c/0x210
[ 31.864188][ T12] kobject_cleanup+0xfe/0x360
[ 31.864362][ T12] netdev_run_todo+0x81f/0xc60
[ 31.864537][ T12] ops_undo_list+0x714/0x890
[ 31.864716][ T12] cleanup_net+0x3b2/0x830
[ 31.864898][ T12] process_one_work+0xe35/0x1650
[ 31.865074][ T12] worker_thread+0x591/0xcf0
[ 31.865252][ T12] kthread+0x37b/0x5f0
[ 31.865384][ T12] ret_from_fork+0x1db/0x270
[ 31.865569][ T12] ret_from_fork_asm+0x11/0x20
[ 31.865749][ T12]
[ 31.865846][ T12] The buggy address belongs to the object at ffff888008fd4000
[ 31.865846][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 31.866279][ T12] The buggy address is located 1692 bytes inside of
[ 31.866279][ T12] freed 4096-byte region [ffff888008fd4000, ffff888008fd5000)
[ 31.866712][ T12]
[ 31.866801][ T12] The buggy address belongs to the physical page:
[ 31.867022][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8fd0
[ 31.867340][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 31.867641][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 31.867872][ T12] page_type: f5(slab)
[ 31.868010][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000228410 ffffea0000174210
[ 31.868324][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 31.868631][ T12] head: 0080000000000040 ffff888001043700 ffffea0000228410 ffffea0000174210
[ 31.869041][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 31.869359][ T12] head: 0080000000000003 ffffea000023f401 00000000ffffffff 00000000ffffffff
[ 31.869665][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 31.870066][ T12] page dumped because: kasan: bad access detected
[ 31.870281][ T12]
[ 31.870367][ T12] Memory state around the buggy address:
[ 31.870626][ T12] ffff888008fd4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 31.870878][ T12] ffff888008fd4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 31.871129][ T12] >ffff888008fd4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 31.871472][ T12] ^
[ 31.871642][ T12] ffff888008fd4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 31.871898][ T12] ffff888008fd4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 31.872234][ T12] ==================================================================
[ 31.872663][ T12] Disabling lock debugging due to kernel taint
[ 31.872888][ T12] ------------[ cut here ]------------
[ 31.873050][ T12] refcount_t: underflow; use-after-free.
[ 31.873422][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 31.873725][ T12] Modules linked in:
[ 31.873873][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 31.874273][ T12] Tainted: [B]=BAD_PAGE
[ 31.874402][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 31.874631][ T12] Workqueue: netns cleanup_net
[ 31.874825][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 31.875051][ T12] 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 a5 8b 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
[ 31.875794][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 31.876030][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 31.876300][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 31.876652][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1882934
[ 31.876982][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 31.877353][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 31.877611][ T12] FS: 0000000000000000(0000) GS:ffff8880a8a04000(0000) knlGS:0000000000000000
[ 31.877923][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 31.878238][ T12] CR2: 00007fff2df2df28 CR3: 000000000fd59001 CR4: 0000000000772ef0
[ 31.878502][ T12] PKRU: 55555554
[ 31.878634][ T12] Call Trace:
[ 31.878763][ T12]
[ 31.878943][ T12] netdev_run_todo+0x5f0/0xc60
[ 31.879122][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 31.879302][ T12] ? generic_xdp_install+0x410/0x410
[ 31.879471][ T12] ops_undo_list+0x714/0x890
[ 31.879728][ T12] ? netns_get+0x110/0x110
[ 31.879892][ T12] ? cleanup_net+0x2d6/0x830
[ 31.880068][ T12] cleanup_net+0x3b2/0x830
[ 31.880247][ T12] ? net_passive_dec+0x190/0x190
[ 31.880500][ T12] ? rcu_is_watching+0x12/0xb0
[ 31.880672][ T12] process_one_work+0xe35/0x1650
[ 31.880844][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 31.881012][ T12] ? assign_work+0x168/0x240
[ 31.881187][ T12] worker_thread+0x591/0xcf0
[ 31.881363][ T12] ? rescuer_thread+0xd10/0xd10
[ 31.881537][ T12] kthread+0x37b/0x5f0
[ 31.881668][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 31.881838][ T12] ? ret_from_fork+0x1b/0x270
[ 31.882093][ T12] ? __lock_release+0x5d/0x170
[ 31.882269][ T12] ? rcu_is_watching+0x12/0xb0
[ 31.882440][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 31.882609][ T12] ret_from_fork+0x1db/0x270
[ 31.882863][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 31.883045][ T12] ret_from_fork_asm+0x11/0x20
[ 31.883230][ T12]
[ 31.883368][ T12] irq event stamp: 10075
[ 31.883584][ T12] hardirqs last enabled at (10075): [] finish_task_switch.isra.0+0x245/0x960
[ 31.883936][ T12] hardirqs last disabled at (10074): [] __schedule+0x94a/0x1b10
[ 31.884320][ T12] softirqs last enabled at (9122): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 31.884670][ T12] softirqs last disabled at (9120): [] dev_mc_flush+0x54/0x90
[ 31.884961][ T12] ---[ end trace 0000000000000000 ]---
[ 347.705974][ T5356] netem: version 1.3
[ 1070.046251][T12423] ip (12423) used greatest stack depth: 23928 bytes left
[ 2452.954001][T30317] pm_nl_ctl (30317) used greatest stack depth: 22952 bytes left