[ 16.495480][ T250] ip (250) used greatest stack depth: 23552 bytes left
[ 27.754464][ T68] ==================================================================
[ 27.754943][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 27.755387][ T68] Read of size 1 at addr ffff88800e40969c by task kworker/u16:1/68
[ 27.755779][ T68]
[ 27.755931][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 27.755941][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 27.755945][ T68] Workqueue: netns cleanup_net
[ 27.755960][ T68] Call Trace:
[ 27.755965][ T68]
[ 27.755969][ T68] dump_stack_lvl+0x82/0xc0
[ 27.755981][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 27.756003][ T68] ? kobject_put+0xbb/0xd0
[ 27.756009][ T68] print_report+0xb4/0x270
[ 27.756015][ T68] ? kobject_put+0xbb/0xd0
[ 27.756019][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 27.756025][ T68] ? kobject_put+0xbb/0xd0
[ 27.756030][ T68] kasan_report+0xca/0x100
[ 27.756037][ T68] ? kobject_put+0xbb/0xd0
[ 27.756047][ T68] kobject_put+0xbb/0xd0
[ 27.756052][ T68] netdev_run_todo+0x5f0/0xc60
[ 27.756065][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 27.756071][ T68] ? generic_xdp_install+0x410/0x410
[ 27.756083][ T68] ops_undo_list+0x714/0x890
[ 27.756096][ T68] ? netns_get+0x110/0x110
[ 27.756101][ T68] ? cleanup_net+0x2d6/0x830
[ 27.756111][ T68] cleanup_net+0x3b2/0x830
[ 27.756118][ T68] ? net_passive_dec+0x190/0x190
[ 27.756128][ T68] ? rcu_is_watching+0x12/0xb0
[ 27.756147][ T68] process_one_work+0xe35/0x1650
[ 27.756168][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 27.756180][ T68] ? assign_work+0x168/0x240
[ 27.756188][ T68] worker_thread+0x591/0xcf0
[ 27.756199][ T68] ? rescuer_thread+0xd10/0xd10
[ 27.756206][ T68] kthread+0x37b/0x5f0
[ 27.756213][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 27.756218][ T68] ? ret_from_fork+0x1b/0x270
[ 27.756237][ T68] ? __lock_release+0x5d/0x170
[ 27.756246][ T68] ? rcu_is_watching+0x12/0xb0
[ 27.756252][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 27.756259][ T68] ret_from_fork+0x1db/0x270
[ 27.756264][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 27.756270][ T68] ret_from_fork_asm+0x11/0x20
[ 27.756295][ T68]
[ 27.756297][ T68]
[ 27.766652][ T68] Allocated by task 315:
[ 27.766859][ T68] kasan_save_stack+0x24/0x40
[ 27.767141][ T68] kasan_save_track+0x14/0x30
[ 27.767416][ T68] __kasan_kmalloc+0x7b/0x90
[ 27.767686][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 27.767965][ T68] alloc_netdev_mqs+0x7d/0x1370
[ 27.768246][ T68] sit_init_net+0x169/0x550
[ 27.768524][ T68] ops_init+0x189/0x550
[ 27.768737][ T68] setup_net+0xf1/0x380
[ 27.768942][ T68] copy_net_ns+0x21a/0x380
[ 27.769258][ T68] create_new_namespaces+0x35f/0x900
[ 27.769540][ T68] unshare_nsproxy_namespaces+0x89/0x120
[ 27.769800][ T68] ksys_unshare+0x2a3/0x660
[ 27.770099][ T68] __x64_sys_unshare+0x31/0x40
[ 27.770394][ T68] do_syscall_64+0xc1/0xfd0
[ 27.770670][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 27.771068][ T68]
[ 27.771206][ T68] Freed by task 68:
[ 27.771405][ T68] kasan_save_stack+0x24/0x40
[ 27.771694][ T68] kasan_save_track+0x14/0x30
[ 27.771976][ T68] __kasan_save_free_info+0x3b/0x60
[ 27.772252][ T68] __kasan_slab_free+0x3f/0x60
[ 27.772519][ T68] kfree+0x21d/0x540
[ 27.772731][ T68] device_release+0x9c/0x210
[ 27.773035][ T68] kobject_cleanup+0xfe/0x360
[ 27.773320][ T68] netdev_run_todo+0x81f/0xc60
[ 27.773591][ T68] ops_undo_list+0x714/0x890
[ 27.773861][ T68] cleanup_net+0x3b2/0x830
[ 27.774132][ T68] process_one_work+0xe35/0x1650
[ 27.774410][ T68] worker_thread+0x591/0xcf0
[ 27.774680][ T68] kthread+0x37b/0x5f0
[ 27.774890][ T68] ret_from_fork+0x1db/0x270
[ 27.775179][ T68] ret_from_fork_asm+0x11/0x20
[ 27.775455][ T68]
[ 27.775596][ T68] The buggy address belongs to the object at ffff88800e409000
[ 27.775596][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 27.776233][ T68] The buggy address is located 1692 bytes inside of
[ 27.776233][ T68] freed 4096-byte region [ffff88800e409000, ffff88800e40a000)
[ 27.776883][ T68]
[ 27.777020][ T68] The buggy address belongs to the physical page:
[ 27.777359][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800e40c000 pfn:0xe408
[ 27.777912][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 27.778325][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1)
[ 27.778684][ T68] page_type: f5(slab)
[ 27.778936][ T68] raw: 0080000000000240 ffff888001043700 ffffea0000307410 ffffea0000390010
[ 27.779457][ T68] raw: ffff88800e40c000 0000000000020001 00000000f5000000 0000000000000000
[ 27.779979][ T68] head: 0080000000000240 ffff888001043700 ffffea0000307410 ffffea0000390010
[ 27.780491][ T68] head: ffff88800e40c000 0000000000020001 00000000f5000000 0000000000000000
[ 27.780983][ T68] head: 0080000000000003 ffffea0000390201 00000000ffffffff 00000000ffffffff
[ 27.781494][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 27.781978][ T68] page dumped because: kasan: bad access detected
[ 27.782326][ T68]
[ 27.782473][ T68] Memory state around the buggy address:
[ 27.782746][ T68] ffff88800e409580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 27.783171][ T68] ffff88800e409600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 27.783566][ T68] >ffff88800e409680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 27.783978][ T68] ^
[ 27.784260][ T68] ffff88800e409700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 27.784652][ T68] ffff88800e409780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 27.785045][ T68] ==================================================================
[ 27.785625][ T68] Disabling lock debugging due to kernel taint
[ 27.785954][ T68] ------------[ cut here ]------------
[ 27.786163][ T68] refcount_t: underflow; use-after-free.
[ 27.786485][ T68] WARNING: CPU: 3 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 27.786833][ T68] Modules linked in:
[ 27.786980][ T68] CPU: 3 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 27.787354][ T68] Tainted: [B]=BAD_PAGE
[ 27.787495][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 27.787730][ T68] Workqueue: netns cleanup_net
[ 27.787902][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 27.788124][ T68] 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 98 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
[ 27.788745][ T68] RSP: 0018:ffffc90000497a08 EFLAGS: 00010282
[ 27.788981][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 27.789234][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 27.789507][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3282934
[ 27.789780][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 27.790055][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 27.790303][ T68] FS: 0000000000000000(0000) GS:ffff88809bb04000(0000) knlGS:0000000000000000
[ 27.790642][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.790885][ T68] CR2: 00007f2213bec000 CR3: 0000000023159002 CR4: 0000000000772ef0
[ 27.791186][ T68] PKRU: 55555554
[ 27.791344][ T68] Call Trace:
[ 27.791489][ T68]
[ 27.791590][ T68] netdev_run_todo+0x5f0/0xc60
[ 27.791812][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 27.792014][ T68] ? generic_xdp_install+0x410/0x410
[ 27.792174][ T68] ops_undo_list+0x714/0x890
[ 27.792351][ T68] ? netns_get+0x110/0x110
[ 27.792529][ T68] ? cleanup_net+0x2d6/0x830
[ 27.792701][ T68] cleanup_net+0x3b2/0x830
[ 27.792902][ T68] ? net_passive_dec+0x190/0x190
[ 27.793070][ T68] ? rcu_is_watching+0x12/0xb0
[ 27.793255][ T68] process_one_work+0xe35/0x1650
[ 27.793434][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 27.793601][ T68] ? assign_work+0x168/0x240
[ 27.793761][ T68] worker_thread+0x591/0xcf0
[ 27.793959][ T68] ? rescuer_thread+0xd10/0xd10
[ 27.794117][ T68] kthread+0x37b/0x5f0
[ 27.794236][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 27.794394][ T68] ? ret_from_fork+0x1b/0x270
[ 27.794559][ T68] ? __lock_release+0x5d/0x170
[ 27.794724][ T68] ? rcu_is_watching+0x12/0xb0
[ 27.794894][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 27.795065][ T68] ret_from_fork+0x1db/0x270
[ 27.795235][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 27.795390][ T68] ret_from_fork_asm+0x11/0x20
[ 27.795566][ T68]
[ 27.795689][ T68] irq event stamp: 8211
[ 27.795812][ T68] hardirqs last enabled at (8211): [] finish_task_switch.isra.0+0x245/0x960
[ 27.796152][ T68] hardirqs last disabled at (8210): [] __schedule+0x94a/0x1b10
[ 27.796456][ T68] softirqs last enabled at (7310): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 27.796771][ T68] softirqs last disabled at (7308): [] dev_mc_flush+0x54/0x90
[ 27.797067][ T68] ---[ end trace 0000000000000000 ]---
[ 34.970362][ T384] netem: version 1.3