[ 30.542259][ T12] ==================================================================
[ 30.542550][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 30.542802][ T12] Read of size 1 at addr ffff888005e616c4 by task kworker/u16:0/12
[ 30.543046][ T12]
[ 30.543137][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.543142][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.543145][ T12] Workqueue: netns cleanup_net
[ 30.543156][ T12] Call Trace:
[ 30.543158][ T12]
[ 30.543161][ T12] dump_stack_lvl+0x82/0xc0
[ 30.543167][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 30.543176][ T12] ? kobject_put+0xbb/0xd0
[ 30.543180][ T12] print_report+0xb4/0x270
[ 30.543184][ T12] ? kobject_put+0xbb/0xd0
[ 30.543187][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 30.543190][ T12] ? kobject_put+0xbb/0xd0
[ 30.543193][ T12] kasan_report+0xca/0x100
[ 30.543200][ T12] ? kobject_put+0xbb/0xd0
[ 30.543208][ T12] kobject_put+0xbb/0xd0
[ 30.543213][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.543221][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.543225][ T12] ? generic_xdp_install+0x410/0x410
[ 30.543228][ T12] ? net_generic+0xb1/0x1f0
[ 30.543238][ T12] ops_undo_list+0x714/0x890
[ 30.543244][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 30.543247][ T12] ? cleanup_net+0x2d6/0x8b0
[ 30.543253][ T12] cleanup_net+0x3b2/0x8b0
[ 30.543258][ T12] ? net_passive_dec+0x190/0x190
[ 30.543263][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.543271][ T12] process_one_work+0xe35/0x1650
[ 30.543281][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.543287][ T12] ? assign_work+0x168/0x240
[ 30.543292][ T12] worker_thread+0x591/0xcf0
[ 30.543298][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.543301][ T12] kthread+0x37b/0x5f0
[ 30.543306][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.543308][ T12] ? ret_from_fork+0x1b/0x270
[ 30.543314][ T12] ? __lock_release+0x5d/0x170
[ 30.543319][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.543322][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.543326][ T12] ret_from_fork+0x1db/0x270
[ 30.543329][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.543332][ T12] ret_from_fork_asm+0x11/0x20
[ 30.543341][ T12]
[ 30.543343][ T12]
[ 30.549761][ T12] Allocated by task 334:
[ 30.549883][ T12] kasan_save_stack+0x24/0x40
[ 30.550073][ T12] kasan_save_track+0x14/0x30
[ 30.550243][ T12] __kasan_kmalloc+0x7b/0x90
[ 30.550401][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 30.550586][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 30.550753][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 30.550927][ T12] ops_init+0x189/0x550
[ 30.551054][ T12] setup_net+0xf1/0x380
[ 30.551174][ T12] copy_net_ns+0x253/0x510
[ 30.551340][ T12] create_new_namespaces+0x35f/0x900
[ 30.551513][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 30.551673][ T12] ksys_unshare+0x2be/0x6e0
[ 30.551831][ T12] __x64_sys_unshare+0x31/0x40
[ 30.552000][ T12] do_syscall_64+0xc1/0xfd0
[ 30.552159][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 30.552370][ T12]
[ 30.552456][ T12] Freed by task 12:
[ 30.552581][ T12] kasan_save_stack+0x24/0x40
[ 30.552743][ T12] kasan_save_track+0x14/0x30
[ 30.552909][ T12] __kasan_save_free_info+0x3b/0x60
[ 30.553166][ T12] __kasan_slab_free+0x3f/0x60
[ 30.553335][ T12] kfree+0x21d/0x540
[ 30.553460][ T12] device_release+0x9c/0x210
[ 30.553637][ T12] kobject_cleanup+0xfe/0x360
[ 30.553804][ T12] netdev_run_todo+0x81f/0xc60
[ 30.554079][ T12] ops_undo_list+0x714/0x890
[ 30.554247][ T12] cleanup_net+0x3b2/0x8b0
[ 30.554403][ T12] process_one_work+0xe35/0x1650
[ 30.554577][ T12] worker_thread+0x591/0xcf0
[ 30.554826][ T12] kthread+0x37b/0x5f0
[ 30.554956][ T12] ret_from_fork+0x1db/0x270
[ 30.555118][ T12] ret_from_fork_asm+0x11/0x20
[ 30.555298][ T12]
[ 30.555384][ T12] The buggy address belongs to the object at ffff888005e61000
[ 30.555384][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 30.555772][ T12] The buggy address is located 1732 bytes inside of
[ 30.555772][ T12] freed 4096-byte region [ffff888005e61000, ffff888005e62000)
[ 30.556169][ T12]
[ 30.556272][ T12] The buggy address belongs to the physical page:
[ 30.556496][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e60
[ 30.556780][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 30.557028][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 30.557243][ T12] page_type: f5(slab)
[ 30.557373][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000364410 ffffea000026a210
[ 30.557675][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.557956][ T12] head: 0080000000000040 ffff888001043700 ffffea0000364410 ffffea000026a210
[ 30.558335][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.558621][ T12] head: 0080000000000003 ffffea0000179801 00000000ffffffff 00000000ffffffff
[ 30.559006][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 30.559289][ T12] page dumped because: kasan: bad access detected
[ 30.559493][ T12]
[ 30.559655][ T12] Memory state around the buggy address:
[ 30.559804][ T12] ffff888005e61580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.560039][ T12] ffff888005e61600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.560367][ T12] >ffff888005e61680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.560602][ T12] ^
[ 30.560792][ T12] ffff888005e61700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.561106][ T12] ffff888005e61780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.561346][ T12] ==================================================================
[ 30.561730][ T12] Disabling lock debugging due to kernel taint
[ 30.561966][ T12] ------------[ cut here ]------------
[ 30.562123][ T12] refcount_t: underflow; use-after-free.
[ 30.562316][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 30.563775][ T12] Modules linked in: cls_bpf sch_ingress
[ 30.563994][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.564493][ T12] Tainted: [B]=BAD_PAGE
[ 30.564615][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.564819][ T12] Workqueue: netns cleanup_net
[ 30.565001][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 30.565233][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 65 a7 e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 30.565869][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 30.566095][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 30.566458][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 30.566708][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff50c0934
[ 30.566972][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 30.567266][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 30.567579][ T12] FS: 0000000000000000(0000) GS:ffff8880c3688000(0000) knlGS:0000000000000000
[ 30.567991][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 30.568207][ T12] CR2: 00005635b5126880 CR3: 000000000ae94002 CR4: 0000000000772ef0
[ 30.568506][ T12] PKRU: 55555554
[ 30.568624][ T12] Call Trace:
[ 30.568749][ T12]
[ 30.568837][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.569050][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.569232][ T12] ? generic_xdp_install+0x410/0x410
[ 30.569479][ T12] ? net_generic+0xb1/0x1f0
[ 30.569645][ T12] ops_undo_list+0x714/0x890
[ 30.569813][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 30.569986][ T12] ? cleanup_net+0x2d6/0x8b0
[ 30.570173][ T12] cleanup_net+0x3b2/0x8b0
[ 30.570334][ T12] ? net_passive_dec+0x190/0x190
[ 30.570574][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.570750][ T12] process_one_work+0xe35/0x1650
[ 30.570918][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.571138][ T12] ? assign_work+0x168/0x240
[ 30.571375][ T12] worker_thread+0x591/0xcf0
[ 30.571538][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.571694][ T12] kthread+0x37b/0x5f0
[ 30.571826][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.572001][ T12] ? ret_from_fork+0x1b/0x270
[ 30.572192][ T12] ? __lock_release+0x5d/0x170
[ 30.572417][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.572577][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.572738][ T12] ret_from_fork+0x1db/0x270
[ 30.572898][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.573099][ T12] ret_from_fork_asm+0x11/0x20
[ 30.573271][ T12]
[ 30.573470][ T12] irq event stamp: 9005
[ 30.573586][ T12] hardirqs last enabled at (9005): [] finish_task_switch.isra.0+0x245/0x960
[ 30.573908][ T12] hardirqs last disabled at (9004): [] __schedule+0x94a/0x1b10
[ 30.574237][ T12] softirqs last enabled at (8718): [] handle_softirqs+0x352/0x610
[ 30.574656][ T12] softirqs last disabled at (8707): [] irq_exit_rcu+0xab/0x100
[ 30.574937][ T12] ---[ end trace 0000000000000000 ]---