[ 17.577006][ T254] ip (254) used greatest stack depth: 23952 bytes left
[ 28.497070][ T12] ==================================================================
[ 28.497445][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 28.497768][ T12] Read of size 1 at addr ffff88800906469c by task kworker/u16:0/12
[ 28.498067][ T12]
[ 28.498196][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 28.498202][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 28.498206][ T12] Workqueue: netns cleanup_net
[ 28.498223][ T12] Call Trace:
[ 28.498227][ T12]
[ 28.498230][ T12] dump_stack_lvl+0x82/0xc0
[ 28.498243][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 28.498256][ T12] ? kobject_put+0xbb/0xd0
[ 28.498260][ T12] print_report+0xb4/0x270
[ 28.498263][ T12] ? kobject_put+0xbb/0xd0
[ 28.498266][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 28.498270][ T12] ? kobject_put+0xbb/0xd0
[ 28.498273][ T12] kasan_report+0xca/0x100
[ 28.498277][ T12] ? kobject_put+0xbb/0xd0
[ 28.498282][ T12] kobject_put+0xbb/0xd0
[ 28.498285][ T12] netdev_run_todo+0x5f0/0xc60
[ 28.498291][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 28.498295][ T12] ? generic_xdp_install+0x410/0x410
[ 28.498301][ T12] ops_undo_list+0x714/0x890
[ 28.498306][ T12] ? netns_get+0x110/0x110
[ 28.498309][ T12] ? cleanup_net+0x2d6/0x830
[ 28.498314][ T12] cleanup_net+0x3b2/0x830
[ 28.498318][ T12] ? net_passive_dec+0x190/0x190
[ 28.498322][ T12] ? rcu_is_watching+0x12/0xb0
[ 28.498337][ T12] process_one_work+0xe35/0x1650
[ 28.498355][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 28.498361][ T12] ? assign_work+0x168/0x240
[ 28.498366][ T12] worker_thread+0x591/0xcf0
[ 28.498372][ T12] ? rescuer_thread+0xd10/0xd10
[ 28.498375][ T12] kthread+0x37b/0x5f0
[ 28.498380][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.498383][ T12] ? ret_from_fork+0x1b/0x270
[ 28.498391][ T12] ? __lock_release+0x5d/0x170
[ 28.498399][ T12] ? rcu_is_watching+0x12/0xb0
[ 28.498402][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.498406][ T12] ret_from_fork+0x1db/0x270
[ 28.498409][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.498412][ T12] ret_from_fork_asm+0x11/0x20
[ 28.498429][ T12]
[ 28.498431][ T12]
[ 28.506205][ T12] Allocated by task 314:
[ 28.506357][ T12] kasan_save_stack+0x24/0x40
[ 28.506585][ T12] kasan_save_track+0x14/0x30
[ 28.506811][ T12] __kasan_kmalloc+0x7b/0x90
[ 28.507022][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 28.507239][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 28.507458][ T12] sit_init_net+0x169/0x550
[ 28.507690][ T12] ops_init+0x189/0x550
[ 28.507857][ T12] setup_net+0xf1/0x380
[ 28.508014][ T12] copy_net_ns+0x21a/0x380
[ 28.508235][ T12] create_new_namespaces+0x35f/0x900
[ 28.508467][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 28.508695][ T12] ksys_unshare+0x2a3/0x660
[ 28.508916][ T12] __x64_sys_unshare+0x31/0x40
[ 28.509130][ T12] do_syscall_64+0xc1/0xfd0
[ 28.509318][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 28.509574][ T12]
[ 28.509696][ T12] Freed by task 12:
[ 28.509859][ T12] kasan_save_stack+0x24/0x40
[ 28.510201][ T12] kasan_save_track+0x14/0x30
[ 28.510419][ T12] __kasan_save_free_info+0x3b/0x60
[ 28.510615][ T12] __kasan_slab_free+0x3f/0x60
[ 28.510797][ T12] kfree+0x21d/0x540
[ 28.511064][ T12] device_release+0x9c/0x210
[ 28.511281][ T12] kobject_cleanup+0xfe/0x360
[ 28.511474][ T12] netdev_run_todo+0x81f/0xc60
[ 28.511674][ T12] ops_undo_list+0x714/0x890
[ 28.512005][ T12] cleanup_net+0x3b2/0x830
[ 28.512194][ T12] process_one_work+0xe35/0x1650
[ 28.512394][ T12] worker_thread+0x591/0xcf0
[ 28.512599][ T12] kthread+0x37b/0x5f0
[ 28.512828][ T12] ret_from_fork+0x1db/0x270
[ 28.513028][ T12] ret_from_fork_asm+0x11/0x20
[ 28.513237][ T12]
[ 28.513335][ T12] The buggy address belongs to the object at ffff888009064000
[ 28.513335][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 28.513908][ T12] The buggy address is located 1692 bytes inside of
[ 28.513908][ T12] freed 4096-byte region [ffff888009064000, ffff888009065000)
[ 28.514441][ T12]
[ 28.514660][ T12] The buggy address belongs to the physical page:
[ 28.514913][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9060
[ 28.515291][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 28.515724][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 28.515972][ T12] page_type: f5(slab)
[ 28.516131][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002fba10 ffffea0000172410
[ 28.516659][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 28.517006][ T12] head: 0080000000000040 ffff888001043700 ffffea00002fba10 ffffea0000172410
[ 28.517467][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 28.517881][ T12] head: 0080000000000003 ffffea0000241801 00000000ffffffff 00000000ffffffff
[ 28.518266][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 28.518709][ T12] page dumped because: kasan: bad access detected
[ 28.518974][ T12]
[ 28.519076][ T12] Memory state around the buggy address:
[ 28.519336][ T12] ffff888009064580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.519685][ T12] ffff888009064600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.519975][ T12] >ffff888009064680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.520321][ T12] ^
[ 28.520563][ T12] ffff888009064700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.520872][ T12] ffff888009064780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.521261][ T12] ==================================================================
[ 28.521735][ T12] Disabling lock debugging due to kernel taint
[ 28.524285][ T12] ------------[ cut here ]------------
[ 28.524590][ T12] refcount_t: underflow; use-after-free.
[ 28.524893][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 28.525341][ T12] Modules linked in:
[ 28.525499][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 28.525931][ T12] Tainted: [B]=BAD_PAGE
[ 28.526131][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 28.526516][ T12] Workqueue: netns cleanup_net
[ 28.526832][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 28.527204][ 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 9d 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
[ 28.528345][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 28.528718][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 28.529149][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 28.529528][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3c82934
[ 28.529957][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 28.530362][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 28.530812][ T12] FS: 0000000000000000(0000) GS:ffff888096984000(0000) knlGS:0000000000000000
[ 28.531299][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.531697][ T12] CR2: 00007fca2564d000 CR3: 0000000023f59002 CR4: 0000000000772ef0
[ 28.532083][ T12] PKRU: 55555554
[ 28.532318][ T12] Call Trace:
[ 28.532536][ T12]
[ 28.532667][ T12] netdev_run_todo+0x5f0/0xc60
[ 28.532927][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 28.533219][ T12] ? generic_xdp_install+0x410/0x410
[ 28.533475][ T12] ops_undo_list+0x714/0x890
[ 28.533742][ T12] ? netns_get+0x110/0x110
[ 28.534040][ T12] ? cleanup_net+0x2d6/0x830
[ 28.534309][ T12] cleanup_net+0x3b2/0x830
[ 28.534568][ T12] ? net_passive_dec+0x190/0x190
[ 28.534860][ T12] ? rcu_is_watching+0x12/0xb0
[ 28.535116][ T12] process_one_work+0xe35/0x1650
[ 28.535399][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 28.535668][ T12] ? assign_work+0x168/0x240
[ 28.535949][ T12] worker_thread+0x591/0xcf0
[ 28.536260][ T12] ? rescuer_thread+0xd10/0xd10
[ 28.536532][ T12] kthread+0x37b/0x5f0
[ 28.536770][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.537016][ T12] ? ret_from_fork+0x1b/0x270
[ 28.537281][ T12] ? __lock_release+0x5d/0x170
[ 28.537581][ T12] ? rcu_is_watching+0x12/0xb0
[ 28.537886][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.538125][ T12] ret_from_fork+0x1db/0x270
[ 28.538410][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 28.538665][ T12] ret_from_fork_asm+0x11/0x20
[ 28.538935][ T12]
[ 28.539180][ T12] irq event stamp: 9373
[ 28.539397][ T12] hardirqs last enabled at (9373): [] finish_task_switch.isra.0+0x245/0x960
[ 28.539879][ T12] hardirqs last disabled at (9372): [] __schedule+0x94a/0x1b10
[ 28.540244][ T12] softirqs last enabled at (8830): [] handle_softirqs+0x352/0x610
[ 28.540565][ T12] softirqs last disabled at (8823): [] irq_exit_rcu+0xab/0x100
[ 28.540854][ T12] ---[ end trace 0000000000000000 ]---
[ 35.582636][ T383] netem: version 1.3