[ 21.337526][ T303] netem: version 1.3
[ 144.884785][ T68] ==================================================================
[ 144.885062][ T68] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 144.885310][ T68] Read of size 1 at addr ffff8880076c969c by task kworker/u16:1/68
[ 144.885544][ T68]
[ 144.885639][ T68] CPU: 1 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 144.885644][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 144.885647][ T68] Workqueue: netns cleanup_net
[ 144.885655][ T68] Call Trace:
[ 144.885657][ T68]
[ 144.885661][ T68] dump_stack_lvl+0x82/0xc0
[ 144.885666][ T68] print_address_description.constprop.0+0x2c/0x3a0
[ 144.885675][ T68] ? kobject_put+0xbb/0xd0
[ 144.885679][ T68] print_report+0xb4/0x270
[ 144.885682][ T68] ? kobject_put+0xbb/0xd0
[ 144.885685][ T68] ? kasan_addr_to_slab+0x21/0x70
[ 144.885689][ T68] ? kobject_put+0xbb/0xd0
[ 144.885691][ T68] kasan_report+0xca/0x100
[ 144.885695][ T68] ? kobject_put+0xbb/0xd0
[ 144.885700][ T68] kobject_put+0xbb/0xd0
[ 144.885704][ T68] netdev_run_todo+0x5f0/0xc60
[ 144.885711][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 144.885714][ T68] ? generic_xdp_install+0x410/0x410
[ 144.885720][ T68] ops_undo_list+0x714/0x890
[ 144.885725][ T68] ? netns_get+0x110/0x110
[ 144.885728][ T68] ? cleanup_net+0x2d6/0x830
[ 144.885733][ T68] cleanup_net+0x3b2/0x830
[ 144.885737][ T68] ? net_passive_dec+0x190/0x190
[ 144.885742][ T68] ? rcu_is_watching+0x12/0xb0
[ 144.885751][ T68] process_one_work+0xe35/0x1650
[ 144.885762][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 144.885768][ T68] ? assign_work+0x168/0x240
[ 144.885773][ T68] worker_thread+0x591/0xcf0
[ 144.885779][ T68] ? rescuer_thread+0xd10/0xd10
[ 144.885783][ T68] kthread+0x37b/0x5f0
[ 144.885788][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 144.885791][ T68] ? ret_from_fork+0x1b/0x270
[ 144.885797][ T68] ? __lock_release+0x5d/0x170
[ 144.885803][ T68] ? rcu_is_watching+0x12/0xb0
[ 144.885806][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 144.885810][ T68] ret_from_fork+0x1db/0x270
[ 144.885813][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 144.885816][ T68] ret_from_fork_asm+0x11/0x20
[ 144.885828][ T68]
[ 144.885829][ T68]
[ 144.891808][ T68] Allocated by task 247:
[ 144.891929][ T68] kasan_save_stack+0x24/0x40
[ 144.892099][ T68] kasan_save_track+0x14/0x30
[ 144.892261][ T68] __kasan_kmalloc+0x7b/0x90
[ 144.892416][ T68] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 144.892584][ T68] alloc_netdev_mqs+0x7d/0x1370
[ 144.892741][ T68] sit_init_net+0x169/0x550
[ 144.892903][ T68] ops_init+0x189/0x550
[ 144.893022][ T68] setup_net+0xf1/0x380
[ 144.893140][ T68] copy_net_ns+0x21a/0x380
[ 144.893300][ T68] create_new_namespaces+0x35f/0x900
[ 144.893458][ T68] unshare_nsproxy_namespaces+0x89/0x120
[ 144.893618][ T68] ksys_unshare+0x2a3/0x660
[ 144.893775][ T68] __x64_sys_unshare+0x31/0x40
[ 144.893929][ T68] do_syscall_64+0xc1/0xfd0
[ 144.894088][ T68] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 144.894286][ T68]
[ 144.894367][ T68] Freed by task 68:
[ 144.894575][ T68] kasan_save_stack+0x24/0x40
[ 144.894735][ T68] kasan_save_track+0x14/0x30
[ 144.894889][ T68] __kasan_save_free_info+0x3b/0x60
[ 144.895051][ T68] __kasan_slab_free+0x3f/0x60
[ 144.895206][ T68] kfree+0x21d/0x540
[ 144.895326][ T68] device_release+0x9c/0x210
[ 144.895489][ T68] kobject_cleanup+0xfe/0x360
[ 144.895647][ T68] netdev_run_todo+0x81f/0xc60
[ 144.895806][ T68] ops_undo_list+0x714/0x890
[ 144.896051][ T68] cleanup_net+0x3b2/0x830
[ 144.896206][ T68] process_one_work+0xe35/0x1650
[ 144.896362][ T68] worker_thread+0x591/0xcf0
[ 144.896521][ T68] kthread+0x37b/0x5f0
[ 144.896731][ T68] ret_from_fork+0x1db/0x270
[ 144.896888][ T68] ret_from_fork_asm+0x11/0x20
[ 144.897055][ T68]
[ 144.897134][ T68] The buggy address belongs to the object at ffff8880076c9000
[ 144.897134][ T68] which belongs to the cache kmalloc-4k of size 4096
[ 144.897607][ T68] The buggy address is located 1692 bytes inside of
[ 144.897607][ T68] freed 4096-byte region [ffff8880076c9000, ffff8880076ca000)
[ 144.898067][ T68]
[ 144.898146][ T68] The buggy address belongs to the physical page:
[ 144.898337][ T68] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76c8
[ 144.898625][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 144.898955][ T68] flags: 0x80000000000040(head|node=0|zone=1)
[ 144.899154][ T68] page_type: f5(slab)
[ 144.899284][ T68] raw: 0080000000000040 ffff888001043700 ffffea0000147410 ffffea000025f610
[ 144.899672][ T68] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 144.899951][ T68] head: 0080000000000040 ffff888001043700 ffffea0000147410 ffffea000025f610
[ 144.900235][ T68] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 144.900507][ T68] head: 0080000000000003 ffffea00001db201 00000000ffffffff 00000000ffffffff
[ 144.900800][ T68] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 144.901168][ T68] page dumped because: kasan: bad access detected
[ 144.901359][ T68]
[ 144.901440][ T68] Memory state around the buggy address:
[ 144.901685][ T68] ffff8880076c9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 144.901918][ T68] ffff8880076c9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 144.902144][ T68] >ffff8880076c9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 144.902453][ T68] ^
[ 144.902607][ T68] ffff8880076c9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 144.902832][ T68] ffff8880076c9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 144.903145][ T68] ==================================================================
[ 144.903485][ T68] Disabling lock debugging due to kernel taint
[ 144.903726][ T68] ------------[ cut here ]------------
[ 144.903880][ T68] refcount_t: underflow; use-after-free.
[ 144.904077][ T68] WARNING: CPU: 0 PID: 68 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 144.904536][ T68] Modules linked in: sch_netem
[ 144.904713][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 144.905086][ T68] Tainted: [B]=BAD_PAGE
[ 144.905227][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 144.905437][ T68] Workqueue: netns cleanup_net
[ 144.905616][ T68] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 144.905837][ 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 c5 b8 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
[ 144.906434][ T68] RSP: 0018:ffffc90000497a08 EFLAGS: 00010282
[ 144.906653][ T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 144.906906][ T68] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 144.907174][ T68] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff72c2934
[ 144.907426][ T68] R10: 0000000000000003 R11: ffffc90000497580 R12: 0000000000000001
[ 144.907669][ T68] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 144.907919][ T68] FS: 0000000000000000(0000) GS:ffff88807b784000(0000) knlGS:0000000000000000
[ 144.908220][ T68] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 144.908431][ T68] CR2: 0000559a2e18b990 CR3: 000000000c690004 CR4: 0000000000772ef0
[ 144.908675][ T68] PKRU: 55555554
[ 144.908885][ T68] Call Trace:
[ 144.909009][ T68]
[ 144.909102][ T68] netdev_run_todo+0x5f0/0xc60
[ 144.909375][ T68] ? dev_ingress_queue_create+0x190/0x190
[ 144.909547][ T68] ? generic_xdp_install+0x410/0x410
[ 144.909714][ T68] ops_undo_list+0x714/0x890
[ 144.909884][ T68] ? netns_get+0x110/0x110
[ 144.910047][ T68] ? cleanup_net+0x2d6/0x830
[ 144.910224][ T68] cleanup_net+0x3b2/0x830
[ 144.910389][ T68] ? net_passive_dec+0x190/0x190
[ 144.910554][ T68] ? rcu_is_watching+0x12/0xb0
[ 144.910727][ T68] process_one_work+0xe35/0x1650
[ 144.910892][ T68] ? pwq_dec_nr_in_flight+0x550/0x550
[ 144.911059][ T68] ? assign_work+0x168/0x240
[ 144.911237][ T68] worker_thread+0x591/0xcf0
[ 144.911406][ T68] ? rescuer_thread+0xd10/0xd10
[ 144.911569][ T68] kthread+0x37b/0x5f0
[ 144.911695][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 144.911864][ T68] ? ret_from_fork+0x1b/0x270
[ 144.912030][ T68] ? __lock_release+0x5d/0x170
[ 144.912206][ T68] ? rcu_is_watching+0x12/0xb0
[ 144.912378][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 144.912542][ T68] ret_from_fork+0x1db/0x270
[ 144.912706][ T68] ? kthread_is_per_cpu+0xc0/0xc0
[ 144.912958][ T68] ret_from_fork_asm+0x11/0x20
[ 144.913128][ T68]
[ 144.913271][ T68] irq event stamp: 8699
[ 144.913394][ T68] hardirqs last enabled at (8699): [] finish_task_switch.isra.0+0x245/0x960
[ 144.913804][ T68] hardirqs last disabled at (8698): [] __schedule+0x94a/0x1b10
[ 144.914094][ T68] softirqs last enabled at (8406): [] handle_softirqs+0x352/0x610
[ 144.914392][ T68] softirqs last disabled at (8397): [] irq_exit_rcu+0xab/0x100
[ 144.914683][ T68] ---[ end trace 0000000000000000 ]---