[ 16.075863][ T71] ==================================================================
[ 16.076222][ T71] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 16.076481][ T71] Read of size 1 at addr ffff8880080a9694 by task kworker/u16:1/71
[ 16.076779][ T71]
[ 16.076867][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.076872][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.076875][ T71] Workqueue: netns cleanup_net
[ 16.076881][ T71] Call Trace:
[ 16.076884][ T71]
[ 16.076886][ T71] dump_stack_lvl+0x82/0xc0
[ 16.076892][ T71] print_address_description.constprop.0+0x2c/0x3a0
[ 16.076899][ T71] ? kobject_put+0xbb/0xd0
[ 16.076903][ T71] print_report+0xb4/0x270
[ 16.076907][ T71] ? kobject_put+0xbb/0xd0
[ 16.076910][ T71] ? kasan_addr_to_slab+0x21/0x70
[ 16.076914][ T71] ? kobject_put+0xbb/0xd0
[ 16.076916][ T71] kasan_report+0xca/0x100
[ 16.076921][ T71] ? kobject_put+0xbb/0xd0
[ 16.076926][ T71] kobject_put+0xbb/0xd0
[ 16.076929][ T71] netdev_run_todo+0x5f0/0xc60
[ 16.076935][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 16.076938][ T71] ? generic_xdp_install+0x410/0x410
[ 16.076945][ T71] ops_undo_list+0x714/0x890
[ 16.076949][ T71] ? netns_get+0x110/0x110
[ 16.076951][ T71] ? cleanup_net+0x2d6/0x830
[ 16.076956][ T71] cleanup_net+0x3b2/0x830
[ 16.076959][ T71] ? net_passive_dec+0x190/0x190
[ 16.076963][ T71] ? rcu_is_watching+0x12/0xb0
[ 16.076968][ T71] process_one_work+0xe35/0x1650
[ 16.076975][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.076981][ T71] ? assign_work+0x168/0x240
[ 16.076984][ T71] worker_thread+0x591/0xcf0
[ 16.076989][ T71] ? rescuer_thread+0xd10/0xd10
[ 16.076992][ T71] kthread+0x37b/0x5f0
[ 16.076996][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.076998][ T71] ? ret_from_fork+0x1b/0x270
[ 16.077003][ T71] ? __lock_release+0x5d/0x170
[ 16.077009][ T71] ? rcu_is_watching+0x12/0xb0
[ 16.077011][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.077015][ T71] ret_from_fork+0x1db/0x270
[ 16.077018][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.077020][ T71] ret_from_fork_asm+0x11/0x20
[ 16.077029][ T71]
[ 16.077030][ T71]
[ 16.083749][ T71] Allocated by task 230:
[ 16.083886][ T71] kasan_save_stack+0x24/0x40
[ 16.084066][ T71] kasan_save_track+0x14/0x30
[ 16.084229][ T71] __kasan_kmalloc+0x7b/0x90
[ 16.084449][ T71] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 16.084664][ T71] alloc_netdev_mqs+0x7d/0x1310
[ 16.084846][ T71] sit_init_net+0x169/0x550
[ 16.085034][ T71] ops_init+0x189/0x550
[ 16.085168][ T71] setup_net+0xf1/0x380
[ 16.085302][ T71] copy_net_ns+0x21a/0x380
[ 16.085486][ T71] create_new_namespaces+0x35f/0x900
[ 16.085680][ T71] unshare_nsproxy_namespaces+0x89/0x120
[ 16.085870][ T71] ksys_unshare+0x2a3/0x660
[ 16.086143][ T71] __x64_sys_unshare+0x31/0x40
[ 16.086318][ T71] do_syscall_64+0xc1/0xfd0
[ 16.086478][ T71] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.086700][ T71]
[ 16.086845][ T71] Freed by task 71:
[ 16.087062][ T71] kasan_save_stack+0x24/0x40
[ 16.087241][ T71] kasan_save_track+0x14/0x30
[ 16.087411][ T71] __kasan_save_free_info+0x3b/0x60
[ 16.087590][ T71] __kasan_slab_free+0x3f/0x60
[ 16.087768][ T71] kfree+0x21d/0x540
[ 16.087891][ T71] device_release+0x9c/0x210
[ 16.088078][ T71] kobject_cleanup+0xfe/0x360
[ 16.088254][ T71] netdev_run_todo+0x81f/0xc60
[ 16.088540][ T71] ops_undo_list+0x714/0x890
[ 16.088736][ T71] cleanup_net+0x3b2/0x830
[ 16.088911][ T71] process_one_work+0xe35/0x1650
[ 16.089116][ T71] worker_thread+0x591/0xcf0
[ 16.089382][ T71] kthread+0x37b/0x5f0
[ 16.089665][ T71] ret_from_fork+0x1db/0x270
[ 16.089838][ T71] ret_from_fork_asm+0x11/0x20
[ 16.090064][ T71]
[ 16.090154][ T71] The buggy address belongs to the object at ffff8880080a9000
[ 16.090154][ T71] which belongs to the cache kmalloc-4k of size 4096
[ 16.090700][ T71] The buggy address is located 1684 bytes inside of
[ 16.090700][ T71] freed 4096-byte region [ffff8880080a9000, ffff8880080aa000)
[ 16.091109][ T71]
[ 16.091196][ T71] The buggy address belongs to the physical page:
[ 16.091404][ T71] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x80a8
[ 16.091729][ T71] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 16.091987][ T71] flags: 0x80000000000040(head|node=0|zone=1)
[ 16.092204][ T71] page_type: f5(slab)
[ 16.092350][ T71] raw: 0080000000000040 ffff888001043700 ffffea00001f5210 ffffea00001fca10
[ 16.092776][ T71] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.093079][ T71] head: 0080000000000040 ffff888001043700 ffffea00001f5210 ffffea00001fca10
[ 16.093390][ T71] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 16.093709][ T71] head: 0080000000000003 ffffea0000202a01 00000000ffffffff 00000000ffffffff
[ 16.094150][ T71] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.094482][ T71] page dumped because: kasan: bad access detected
[ 16.094710][ T71]
[ 16.094800][ T71] Memory state around the buggy address:
[ 16.094968][ T71] ffff8880080a9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.095220][ T71] ffff8880080a9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.095468][ T71] >ffff8880080a9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.095821][ T71] ^
[ 16.095995][ T71] ffff8880080a9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.096235][ T71] ffff8880080a9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 16.096674][ T71] ==================================================================
[ 16.097031][ T71] Disabling lock debugging due to kernel taint
[ 16.097296][ T71] ------------[ cut here ]------------
[ 16.097494][ T71] refcount_t: underflow; use-after-free.
[ 16.097717][ T71] WARNING: CPU: 2 PID: 71 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.098121][ T71] Modules linked in: veth
[ 16.098316][ T71] CPU: 2 UID: 0 PID: 71 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.098803][ T71] Tainted: [B]=BAD_PAGE
[ 16.098968][ T71] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.099320][ T71] Workqueue: netns cleanup_net
[ 16.099554][ T71] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.099824][ T71] 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 65 92 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
[ 16.100628][ T71] RSP: 0018:ffffc900004c7a08 EFLAGS: 00010282
[ 16.100898][ T71] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.101301][ T71] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.101624][ T71] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff25fe134
[ 16.101928][ T71] R10: 0000000000000003 R11: ffffc900004c7580 R12: 0000000000000001
[ 16.102369][ T71] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.102712][ T71] FS: 0000000000000000(0000) GS:ffff88809c310000(0000) knlGS:0000000000000000
[ 16.103200][ T71] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.103483][ T71] CR2: 00007f843868a0c8 CR3: 000000000a8d6006 CR4: 0000000000772ef0
[ 16.103817][ T71] PKRU: 55555554
[ 16.103995][ T71] Call Trace:
[ 16.104296][ T71]
[ 16.104451][ T71] netdev_run_todo+0x5f0/0xc60
[ 16.104709][ T71] ? dev_ingress_queue_create+0x190/0x190
[ 16.104987][ T71] ? generic_xdp_install+0x410/0x410
[ 16.105364][ T71] ops_undo_list+0x714/0x890
[ 16.105605][ T71] ? netns_get+0x110/0x110
[ 16.105856][ T71] ? cleanup_net+0x2d6/0x830
[ 16.106091][ T71] cleanup_net+0x3b2/0x830
[ 16.106409][ T71] ? net_passive_dec+0x190/0x190
[ 16.106632][ T71] ? rcu_is_watching+0x12/0xb0
[ 16.106861][ T71] process_one_work+0xe35/0x1650
[ 16.107153][ T71] ? pwq_dec_nr_in_flight+0x550/0x550
[ 16.107450][ T71] ? assign_work+0x168/0x240
[ 16.107648][ T71] worker_thread+0x591/0xcf0
[ 16.107944][ T71] ? rescuer_thread+0xd10/0xd10
[ 16.108146][ T71] kthread+0x37b/0x5f0
[ 16.108293][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.108479][ T71] ? ret_from_fork+0x1b/0x270
[ 16.108724][ T71] ? __lock_release+0x5d/0x170
[ 16.109017][ T71] ? rcu_is_watching+0x12/0xb0
[ 16.109297][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.109544][ T71] ret_from_fork+0x1db/0x270
[ 16.109846][ T71] ? kthread_is_per_cpu+0xc0/0xc0
[ 16.110177][ T71] ret_from_fork_asm+0x11/0x20
[ 16.110479][ T71]
[ 16.110701][ T71] irq event stamp: 3761
[ 16.110933][ T71] hardirqs last enabled at (3761): [] irqentry_exit+0x3b/0x80
[ 16.111402][ T71] hardirqs last disabled at (3760): [] handle_softirqs+0x47f/0x610
[ 16.112035][ T71] softirqs last enabled at (3308): [] handle_softirqs+0x352/0x610
[ 16.112508][ T71] softirqs last disabled at (2141): [] irq_exit_rcu+0xab/0x100
[ 16.112986][ T71] ---[ end trace 0000000000000000 ]---