[ 14.513792][ T12] ==================================================================
[ 14.514165][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.514462][ T12] Read of size 1 at addr ffff888001fdc694 by task kworker/u16:0/12
[ 14.514759][ T12]
[ 14.514862][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.514869][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.514874][ T12] Workqueue: netns cleanup_net
[ 14.514882][ T12] Call Trace:
[ 14.514885][ T12]
[ 14.514888][ T12] dump_stack_lvl+0x82/0xc0
[ 14.514894][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 14.514903][ T12] ? kobject_put+0xbb/0xd0
[ 14.514907][ T12] print_report+0xb4/0x270
[ 14.514910][ T12] ? kobject_put+0xbb/0xd0
[ 14.514913][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 14.514917][ T12] ? kobject_put+0xbb/0xd0
[ 14.514920][ T12] kasan_report+0xca/0x100
[ 14.514924][ T12] ? kobject_put+0xbb/0xd0
[ 14.514929][ T12] kobject_put+0xbb/0xd0
[ 14.514933][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.514939][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.514943][ T12] ? generic_xdp_install+0x410/0x410
[ 14.514949][ T12] ops_undo_list+0x714/0x890
[ 14.514954][ T12] ? netns_get+0x110/0x110
[ 14.514956][ T12] ? cleanup_net+0x2d6/0x830
[ 14.514961][ T12] cleanup_net+0x3b2/0x830
[ 14.514964][ T12] ? net_passive_dec+0x190/0x190
[ 14.514968][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.514975][ T12] process_one_work+0xe35/0x1650
[ 14.514983][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.514988][ T12] ? assign_work+0x168/0x240
[ 14.514992][ T12] worker_thread+0x591/0xcf0
[ 14.514997][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.515001][ T12] kthread+0x37b/0x5f0
[ 14.515004][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.515006][ T12] ? ret_from_fork+0x1b/0x270
[ 14.515013][ T12] ? __lock_release+0x5d/0x170
[ 14.515019][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.515022][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.515025][ T12] ret_from_fork+0x1db/0x270
[ 14.515028][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.515030][ T12] ret_from_fork_asm+0x11/0x20
[ 14.515039][ T12]
[ 14.515040][ T12]
[ 14.523043][ T12] Allocated by task 229:
[ 14.523194][ T12] kasan_save_stack+0x24/0x40
[ 14.523400][ T12] kasan_save_track+0x14/0x30
[ 14.523704][ T12] __kasan_kmalloc+0x7b/0x90
[ 14.523903][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.524097][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 14.524293][ T12] sit_init_net+0x169/0x550
[ 14.524491][ T12] ops_init+0x189/0x550
[ 14.524639][ T12] setup_net+0xf1/0x380
[ 14.524797][ T12] copy_net_ns+0x21a/0x380
[ 14.524993][ T12] create_new_namespaces+0x35f/0x900
[ 14.525199][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 14.525481][ T12] ksys_unshare+0x2a3/0x660
[ 14.525688][ T12] __x64_sys_unshare+0x31/0x40
[ 14.525883][ T12] do_syscall_64+0xc1/0xfd0
[ 14.526075][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.526414][ T12]
[ 14.526517][ T12] Freed by task 12:
[ 14.526670][ T12] kasan_save_stack+0x24/0x40
[ 14.526880][ T12] kasan_save_track+0x14/0x30
[ 14.527160][ T12] __kasan_save_free_info+0x3b/0x60
[ 14.527358][ T12] __kasan_slab_free+0x3f/0x60
[ 14.527587][ T12] kfree+0x21d/0x540
[ 14.527743][ T12] device_release+0x9c/0x210
[ 14.527953][ T12] kobject_cleanup+0xfe/0x360
[ 14.528145][ T12] netdev_run_todo+0x81f/0xc60
[ 14.528340][ T12] ops_undo_list+0x714/0x890
[ 14.528545][ T12] cleanup_net+0x3b2/0x830
[ 14.528751][ T12] process_one_work+0xe35/0x1650
[ 14.529048][ T12] worker_thread+0x591/0xcf0
[ 14.529245][ T12] kthread+0x37b/0x5f0
[ 14.529388][ T12] ret_from_fork+0x1db/0x270
[ 14.529586][ T12] ret_from_fork_asm+0x11/0x20
[ 14.529882][ T12]
[ 14.529985][ T12] The buggy address belongs to the object at ffff888001fdc000
[ 14.529985][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 14.530462][ T12] The buggy address is located 1684 bytes inside of
[ 14.530462][ T12] freed 4096-byte region [ffff888001fdc000, ffff888001fdd000)
[ 14.531031][ T12]
[ 14.531130][ T12] The buggy address belongs to the physical page:
[ 14.531372][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fd8
[ 14.531828][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.532115][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.532463][ T12] page_type: f5(slab)
[ 14.532624][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000216610 ffffea000015f210
[ 14.532971][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.533419][ T12] head: 0080000000000040 ffff888001043700 ffffea0000216610 ffffea000015f210
[ 14.533768][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.534206][ T12] head: 0080000000000003 ffffea000007f601 00000000ffffffff 00000000ffffffff
[ 14.534542][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.534890][ T12] page dumped because: kasan: bad access detected
[ 14.535230][ T12]
[ 14.535326][ T12] Memory state around the buggy address:
[ 14.535570][ T12] ffff888001fdc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.535882][ T12] ffff888001fdc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.536159][ T12] >ffff888001fdc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.536449][ T12] ^
[ 14.536646][ T12] ffff888001fdc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.537009][ T12] ffff888001fdc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.537283][ T12] ==================================================================
[ 14.537729][ T12] Disabling lock debugging due to kernel taint
[ 14.538012][ T12] ------------[ cut here ]------------
[ 14.538226][ T12] refcount_t: underflow; use-after-free.
[ 14.538519][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.539641][ T12] Modules linked in: veth
[ 14.539869][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.540681][ T12] Tainted: [B]=BAD_PAGE
[ 14.540910][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.541243][ T12] Workqueue: netns cleanup_net
[ 14.541517][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.541875][ T12] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d e5 9e e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 14.543030][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 14.543490][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.543842][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.544256][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3efe134
[ 14.544672][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 14.545047][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.545466][ T12] FS: 0000000000000000(0000) GS:ffff88808fc10000(0000) knlGS:0000000000000000
[ 14.545945][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.546287][ T12] CR2: 00007fd1f5345000 CR3: 0000000009453004 CR4: 0000000000772ef0
[ 14.546710][ T12] PKRU: 55555554
[ 14.546921][ T12] Call Trace:
[ 14.547114][ T12]
[ 14.547260][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.547716][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.548015][ T12] ? generic_xdp_install+0x410/0x410
[ 14.548335][ T12] ops_undo_list+0x714/0x890
[ 14.548672][ T12] ? netns_get+0x110/0x110
[ 14.549085][ T12] ? cleanup_net+0x2d6/0x830
[ 14.549373][ T12] cleanup_net+0x3b2/0x830
[ 14.549564][ T12] ? net_passive_dec+0x190/0x190
[ 14.549724][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.549887][ T12] process_one_work+0xe35/0x1650
[ 14.550064][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.550231][ T12] ? assign_work+0x168/0x240
[ 14.550421][ T12] worker_thread+0x591/0xcf0
[ 14.550639][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.550821][ T12] kthread+0x37b/0x5f0
[ 14.550968][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.551128][ T12] ? ret_from_fork+0x1b/0x270
[ 14.551325][ T12] ? __lock_release+0x5d/0x170
[ 14.551490][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.551738][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.552021][ T12] ret_from_fork+0x1db/0x270
[ 14.552294][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.552542][ T12] ret_from_fork_asm+0x11/0x20
[ 14.552821][ T12]
[ 14.553038][ T12] irq event stamp: 2677
[ 14.553258][ T12] hardirqs last enabled at (2677): [] finish_task_switch.isra.0+0x245/0x960
[ 14.553928][ T12] hardirqs last disabled at (2676): [] __schedule+0x94a/0x1b10
[ 14.554238][ T12] softirqs last enabled at (1796): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 14.554660][ T12] softirqs last disabled at (1794): [] dev_mc_flush+0x54/0x90
[ 14.555039][ T12] ---[ end trace 0000000000000000 ]---