[ 104.505484][ T12] ==================================================================
[ 104.505802][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 104.506047][ T12] Read of size 1 at addr ffff88800838c69c by task kworker/u16:0/12
[ 104.506272][ T12]
[ 104.506358][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 104.506363][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 104.506365][ T12] Workqueue: netns cleanup_net
[ 104.506373][ T12] Call Trace:
[ 104.506375][ T12]
[ 104.506378][ T12] dump_stack_lvl+0x82/0xc0
[ 104.506385][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 104.506397][ T12] ? kobject_put+0xbb/0xd0
[ 104.506400][ T12] print_report+0xb4/0x270
[ 104.506404][ T12] ? kobject_put+0xbb/0xd0
[ 104.506407][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 104.506410][ T12] ? kobject_put+0xbb/0xd0
[ 104.506413][ T12] kasan_report+0xca/0x100
[ 104.506417][ T12] ? kobject_put+0xbb/0xd0
[ 104.506422][ T12] kobject_put+0xbb/0xd0
[ 104.506425][ T12] netdev_run_todo+0x5f0/0xc60
[ 104.506433][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 104.506436][ T12] ? generic_xdp_install+0x410/0x410
[ 104.506442][ T12] ops_undo_list+0x714/0x890
[ 104.506447][ T12] ? netns_get+0x110/0x110
[ 104.506450][ T12] ? cleanup_net+0x2d6/0x830
[ 104.506457][ T12] cleanup_net+0x3b2/0x830
[ 104.506461][ T12] ? net_passive_dec+0x190/0x190
[ 104.506465][ T12] ? rcu_is_watching+0x12/0xb0
[ 104.506475][ T12] process_one_work+0xe35/0x1650
[ 104.506487][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 104.506495][ T12] ? assign_work+0x168/0x240
[ 104.506500][ T12] worker_thread+0x591/0xcf0
[ 104.506506][ T12] ? rescuer_thread+0xd10/0xd10
[ 104.506510][ T12] kthread+0x37b/0x5f0
[ 104.506514][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 104.506517][ T12] ? ret_from_fork+0x1b/0x270
[ 104.506522][ T12] ? __lock_release+0x5d/0x170
[ 104.506528][ T12] ? rcu_is_watching+0x12/0xb0
[ 104.506532][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 104.506535][ T12] ret_from_fork+0x1db/0x270
[ 104.506538][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 104.506541][ T12] ret_from_fork_asm+0x11/0x20
[ 104.506553][ T12]
[ 104.506554][ T12]
[ 104.512378][ T12] Allocated by task 241:
[ 104.512499][ T12] kasan_save_stack+0x24/0x40
[ 104.512666][ T12] kasan_save_track+0x14/0x30
[ 104.512823][ T12] __kasan_kmalloc+0x7b/0x90
[ 104.512975][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 104.513133][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 104.513290][ T12] sit_init_net+0x169/0x550
[ 104.513443][ T12] ops_init+0x189/0x550
[ 104.513560][ T12] setup_net+0xf1/0x380
[ 104.513683][ T12] copy_net_ns+0x21a/0x380
[ 104.513835][ T12] create_new_namespaces+0x35f/0x900
[ 104.514001][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 104.514155][ T12] ksys_unshare+0x2a3/0x660
[ 104.514311][ T12] __x64_sys_unshare+0x31/0x40
[ 104.514463][ T12] do_syscall_64+0xc1/0xfd0
[ 104.514618][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 104.514817][ T12]
[ 104.514897][ T12] Freed by task 12:
[ 104.515013][ T12] kasan_save_stack+0x24/0x40
[ 104.515173][ T12] kasan_save_track+0x14/0x30
[ 104.515326][ T12] __kasan_save_free_info+0x3b/0x60
[ 104.515479][ T12] __kasan_slab_free+0x3f/0x60
[ 104.515643][ T12] kfree+0x21d/0x540
[ 104.515762][ T12] device_release+0x9c/0x210
[ 104.515921][ T12] kobject_cleanup+0xfe/0x360
[ 104.516074][ T12] netdev_run_todo+0x81f/0xc60
[ 104.516231][ T12] ops_undo_list+0x714/0x890
[ 104.516386][ T12] cleanup_net+0x3b2/0x830
[ 104.516538][ T12] process_one_work+0xe35/0x1650
[ 104.516706][ T12] worker_thread+0x591/0xcf0
[ 104.516862][ T12] kthread+0x37b/0x5f0
[ 104.516978][ T12] ret_from_fork+0x1db/0x270
[ 104.517132][ T12] ret_from_fork_asm+0x11/0x20
[ 104.517286][ T12]
[ 104.517366][ T12] The buggy address belongs to the object at ffff88800838c000
[ 104.517366][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 104.517748][ T12] The buggy address is located 1692 bytes inside of
[ 104.517748][ T12] freed 4096-byte region [ffff88800838c000, ffff88800838d000)
[ 104.518125][ T12]
[ 104.518203][ T12] The buggy address belongs to the physical page:
[ 104.518397][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8388
[ 104.518684][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 104.518920][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 104.519124][ T12] page_type: f5(slab)
[ 104.519254][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001d6a10 ffffea0000220a10
[ 104.519534][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 104.519819][ T12] head: 0080000000000040 ffff888001043700 ffffea00001d6a10 ffffea0000220a10
[ 104.520096][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 104.520376][ T12] head: 0080000000000003 ffffea000020e201 00000000ffffffff 00000000ffffffff
[ 104.520655][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 104.520944][ T12] page dumped because: kasan: bad access detected
[ 104.521140][ T12]
[ 104.521221][ T12] Memory state around the buggy address:
[ 104.521369][ T12] ffff88800838c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 104.521596][ T12] ffff88800838c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 104.521829][ T12] >ffff88800838c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 104.522057][ T12] ^
[ 104.522207][ T12] ffff88800838c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 104.522431][ T12] ffff88800838c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 104.522666][ T12] ==================================================================
[ 104.523101][ T12] Disabling lock debugging due to kernel taint
[ 104.523295][ T12] ------------[ cut here ]------------
[ 104.523440][ T12] refcount_t: underflow; use-after-free.
[ 104.523664][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 104.524001][ T12] Modules linked in:
[ 104.524130][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 104.524467][ T12] Tainted: [B]=BAD_PAGE
[ 104.524590][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 104.524798][ T12] Workqueue: netns cleanup_net
[ 104.524959][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 104.525155][ 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 65 b1 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
[ 104.525702][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 104.525906][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 104.526140][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 104.526366][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6402934
[ 104.526588][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 104.526830][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 104.527053][ T12] FS: 0000000000000000(0000) GS:ffff888082d84000(0000) knlGS:0000000000000000
[ 104.527317][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 104.527506][ T12] CR2: 00007f14108b5d40 CR3: 0000000001e3a005 CR4: 0000000000772ef0
[ 104.527837][ T12] PKRU: 55555554
[ 104.527955][ T12] Call Trace:
[ 104.528067][ T12]
[ 104.528146][ T12] netdev_run_todo+0x5f0/0xc60
[ 104.528387][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 104.528628][ T12] ? generic_xdp_install+0x410/0x410
[ 104.528792][ T12] ops_undo_list+0x714/0x890
[ 104.528941][ T12] ? netns_get+0x110/0x110
[ 104.529173][ T12] ? cleanup_net+0x2d6/0x830
[ 104.529407][ T12] cleanup_net+0x3b2/0x830
[ 104.529646][ T12] ? net_passive_dec+0x190/0x190
[ 104.529803][ T12] ? rcu_is_watching+0x12/0xb0
[ 104.529961][ T12] process_one_work+0xe35/0x1650
[ 104.530116][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 104.530269][ T12] ? assign_work+0x168/0x240
[ 104.530417][ T12] worker_thread+0x591/0xcf0
[ 104.530568][ T12] ? rescuer_thread+0xd10/0xd10
[ 104.530723][ T12] kthread+0x37b/0x5f0
[ 104.530933][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 104.531173][ T12] ? ret_from_fork+0x1b/0x270
[ 104.531326][ T12] ? __lock_release+0x5d/0x170
[ 104.531476][ T12] ? rcu_is_watching+0x12/0xb0
[ 104.531714][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 104.531872][ T12] ret_from_fork+0x1db/0x270
[ 104.532022][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 104.532170][ T12] ret_from_fork_asm+0x11/0x20
[ 104.532406][ T12]
[ 104.532526][ T12] irq event stamp: 2655
[ 104.532645][ T12] hardirqs last enabled at (2655): [] finish_task_switch.isra.0+0x245/0x960
[ 104.533037][ T12] hardirqs last disabled at (2654): [] __schedule+0x94a/0x1b10
[ 104.533384][ T12] softirqs last enabled at (2136): [] handle_softirqs+0x352/0x610
[ 104.533651][ T12] softirqs last disabled at (2131): [] irq_exit_rcu+0xab/0x100
[ 104.533934][ T12] ---[ end trace 0000000000000000 ]---