[ 23.310648][ T274] ip (274) used greatest stack depth: 23952 bytes left
[ 32.417200][ T12] ==================================================================
[ 32.417522][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 32.417845][ T12] Read of size 1 at addr ffff88800c36469c by task kworker/u16:0/12
[ 32.418113][ T12]
[ 32.418207][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 32.418212][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 32.418215][ T12] Workqueue: netns cleanup_net
[ 32.418224][ T12] Call Trace:
[ 32.418226][ T12]
[ 32.418229][ T12] dump_stack_lvl+0x82/0xc0
[ 32.418235][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 32.418242][ T12] ? kobject_put+0xbb/0xd0
[ 32.418245][ T12] print_report+0xb4/0x270
[ 32.418249][ T12] ? kobject_put+0xbb/0xd0
[ 32.418252][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 32.418255][ T12] ? kobject_put+0xbb/0xd0
[ 32.418258][ T12] kasan_report+0xca/0x100
[ 32.418262][ T12] ? kobject_put+0xbb/0xd0
[ 32.418267][ T12] kobject_put+0xbb/0xd0
[ 32.418270][ T12] netdev_run_todo+0x5f0/0xc60
[ 32.418275][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 32.418278][ T12] ? generic_xdp_install+0x410/0x410
[ 32.418285][ T12] ops_undo_list+0x714/0x890
[ 32.418290][ T12] ? netns_get+0x110/0x110
[ 32.418292][ T12] ? cleanup_net+0x2d6/0x830
[ 32.418298][ T12] cleanup_net+0x3b2/0x830
[ 32.418302][ T12] ? net_passive_dec+0x190/0x190
[ 32.418306][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.418313][ T12] process_one_work+0xe35/0x1650
[ 32.418322][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 32.418328][ T12] ? assign_work+0x168/0x240
[ 32.418332][ T12] worker_thread+0x591/0xcf0
[ 32.418338][ T12] ? rescuer_thread+0xd10/0xd10
[ 32.418342][ T12] kthread+0x37b/0x5f0
[ 32.418347][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.418350][ T12] ? ret_from_fork+0x1b/0x270
[ 32.418354][ T12] ? __lock_release+0x5d/0x170
[ 32.418359][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.418363][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.418366][ T12] ret_from_fork+0x1db/0x270
[ 32.418369][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.418372][ T12] ret_from_fork_asm+0x11/0x20
[ 32.418382][ T12]
[ 32.418383][ T12]
[ 32.425498][ T12] Allocated by task 319:
[ 32.425648][ T12] kasan_save_stack+0x24/0x40
[ 32.425847][ T12] kasan_save_track+0x14/0x30
[ 32.426028][ T12] __kasan_kmalloc+0x7b/0x90
[ 32.426186][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 32.426346][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 32.426505][ T12] sit_init_net+0x169/0x550
[ 32.426676][ T12] ops_init+0x189/0x550
[ 32.426817][ T12] setup_net+0xf1/0x380
[ 32.426963][ T12] copy_net_ns+0x21a/0x380
[ 32.427136][ T12] create_new_namespaces+0x35f/0x900
[ 32.427290][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 32.427449][ T12] ksys_unshare+0x2a3/0x660
[ 32.427612][ T12] __x64_sys_unshare+0x31/0x40
[ 32.427796][ T12] do_syscall_64+0xc1/0xfd0
[ 32.427985][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 32.428184][ T12]
[ 32.428267][ T12] Freed by task 12:
[ 32.428387][ T12] kasan_save_stack+0x24/0x40
[ 32.428551][ T12] kasan_save_track+0x14/0x30
[ 32.428735][ T12] __kasan_save_free_info+0x3b/0x60
[ 32.428923][ T12] __kasan_slab_free+0x3f/0x60
[ 32.429098][ T12] kfree+0x21d/0x540
[ 32.429308][ T12] device_release+0x9c/0x210
[ 32.429470][ T12] kobject_cleanup+0xfe/0x360
[ 32.429679][ T12] netdev_run_todo+0x81f/0xc60
[ 32.429903][ T12] ops_undo_list+0x714/0x890
[ 32.430084][ T12] cleanup_net+0x3b2/0x830
[ 32.430247][ T12] process_one_work+0xe35/0x1650
[ 32.430411][ T12] worker_thread+0x591/0xcf0
[ 32.430570][ T12] kthread+0x37b/0x5f0
[ 32.430807][ T12] ret_from_fork+0x1db/0x270
[ 32.431008][ T12] ret_from_fork_asm+0x11/0x20
[ 32.431196][ T12]
[ 32.431288][ T12] The buggy address belongs to the object at ffff88800c364000
[ 32.431288][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 32.431823][ T12] The buggy address is located 1692 bytes inside of
[ 32.431823][ T12] freed 4096-byte region [ffff88800c364000, ffff88800c365000)
[ 32.432274][ T12]
[ 32.432456][ T12] The buggy address belongs to the physical page:
[ 32.432729][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc360
[ 32.433110][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 32.433460][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 32.433693][ T12] page_type: f5(slab)
[ 32.433835][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002ea810 ffffea0000247610
[ 32.434160][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 32.434440][ T12] head: 0080000000000040 ffff888001043700 ffffea00002ea810 ffffea0000247610
[ 32.434865][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 32.435218][ T12] head: 0080000000000003 ffffea000030d801 00000000ffffffff 00000000ffffffff
[ 32.435497][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 32.435908][ T12] page dumped because: kasan: bad access detected
[ 32.436146][ T12]
[ 32.436225][ T12] Memory state around the buggy address:
[ 32.436487][ T12] ffff88800c364580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.436784][ T12] ffff88800c364600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.437062][ T12] >ffff88800c364680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.437411][ T12] ^
[ 32.437591][ T12] ffff88800c364700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.437890][ T12] ffff88800c364780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.438232][ T12] ==================================================================
[ 32.438600][ T12] Disabling lock debugging due to kernel taint
[ 32.439001][ T12] ------------[ cut here ]------------
[ 32.439245][ T12] refcount_t: underflow; use-after-free.
[ 32.439526][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 32.440117][ T12] Modules linked in:
[ 32.440331][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 32.440904][ T12] Tainted: [B]=BAD_PAGE
[ 32.441113][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 32.441446][ T12] Workqueue: netns cleanup_net
[ 32.441716][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 32.442083][ 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 8a 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
[ 32.443060][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 32.443398][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 32.443794][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 32.444217][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1682934
[ 32.444617][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 32.445014][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 32.445389][ T12] FS: 0000000000000000(0000) GS:ffff8880a9984000(0000) knlGS:0000000000000000
[ 32.445830][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 32.446160][ T12] CR2: 00007f0dc7d31fe0 CR3: 0000000028359005 CR4: 0000000000772ef0
[ 32.446541][ T12] PKRU: 55555554
[ 32.446728][ T12] Call Trace:
[ 32.446924][ T12]
[ 32.447071][ T12] netdev_run_todo+0x5f0/0xc60
[ 32.447323][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 32.447578][ T12] ? generic_xdp_install+0x410/0x410
[ 32.447828][ T12] ops_undo_list+0x714/0x890
[ 32.448076][ T12] ? netns_get+0x110/0x110
[ 32.448315][ T12] ? cleanup_net+0x2d6/0x830
[ 32.448579][ T12] cleanup_net+0x3b2/0x830
[ 32.448831][ T12] ? net_passive_dec+0x190/0x190
[ 32.449089][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.449341][ T12] process_one_work+0xe35/0x1650
[ 32.449589][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 32.449840][ T12] ? assign_work+0x168/0x240
[ 32.450118][ T12] worker_thread+0x591/0xcf0
[ 32.450402][ T12] ? rescuer_thread+0xd10/0xd10
[ 32.450662][ T12] kthread+0x37b/0x5f0
[ 32.450859][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.451300][ T12] ? ret_from_fork+0x1b/0x270
[ 32.451556][ T12] ? __lock_release+0x5d/0x170
[ 32.451809][ T12] ? rcu_is_watching+0x12/0xb0
[ 32.452068][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.452487][ T12] ret_from_fork+0x1db/0x270
[ 32.452738][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 32.453011][ T12] ret_from_fork_asm+0x11/0x20
[ 32.453264][ T12]
[ 32.453449][ T12] irq event stamp: 8617
[ 32.453800][ T12] hardirqs last enabled at (8617): [] finish_task_switch.isra.0+0x245/0x960
[ 32.454310][ T12] hardirqs last disabled at (8616): [] __schedule+0x94a/0x1b10
[ 32.454742][ T12] softirqs last enabled at (7654): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 32.455252][ T12] softirqs last disabled at (7652): [] dev_mc_flush+0x54/0x90
[ 32.455693][ T12] ---[ end trace 0000000000000000 ]---
[ 40.181233][ T388] netem: version 1.3