[ 14.185127][ T12] ==================================================================
[ 14.185463][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.185723][ T12] Read of size 1 at addr ffff8880074cc694 by task kworker/u16:0/12
[ 14.185949][ T12]
[ 14.186041][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.186046][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.186048][ T12] Workqueue: netns cleanup_net
[ 14.186056][ T12] Call Trace:
[ 14.186058][ T12]
[ 14.186060][ T12] dump_stack_lvl+0x82/0xc0
[ 14.186067][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 14.186076][ T12] ? kobject_put+0xbb/0xd0
[ 14.186080][ T12] print_report+0xb4/0x270
[ 14.186083][ T12] ? kobject_put+0xbb/0xd0
[ 14.186086][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 14.186090][ T12] ? kobject_put+0xbb/0xd0
[ 14.186093][ T12] kasan_report+0xca/0x100
[ 14.186097][ T12] ? kobject_put+0xbb/0xd0
[ 14.186102][ T12] kobject_put+0xbb/0xd0
[ 14.186106][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.186113][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.186117][ T12] ? generic_xdp_install+0x410/0x410
[ 14.186123][ T12] ops_undo_list+0x714/0x890
[ 14.186127][ T12] ? netns_get+0x110/0x110
[ 14.186129][ T12] ? cleanup_net+0x2d6/0x830
[ 14.186134][ T12] cleanup_net+0x3b2/0x830
[ 14.186137][ T12] ? net_passive_dec+0x190/0x190
[ 14.186141][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.186149][ T12] process_one_work+0xe35/0x1650
[ 14.186157][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.186162][ T12] ? assign_work+0x168/0x240
[ 14.186165][ T12] worker_thread+0x591/0xcf0
[ 14.186170][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.186173][ T12] kthread+0x37b/0x5f0
[ 14.186177][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.186180][ T12] ? ret_from_fork+0x1b/0x270
[ 14.186186][ T12] ? __lock_release+0x5d/0x170
[ 14.186192][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.186195][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.186198][ T12] ret_from_fork+0x1db/0x270
[ 14.186201][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.186204][ T12] ret_from_fork_asm+0x11/0x20
[ 14.186211][ T12]
[ 14.186212][ T12]
[ 14.192632][ T12] Allocated by task 228:
[ 14.192763][ T12] kasan_save_stack+0x24/0x40
[ 14.192984][ T12] kasan_save_track+0x14/0x30
[ 14.193185][ T12] __kasan_kmalloc+0x7b/0x90
[ 14.193406][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.193612][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 14.193782][ T12] sit_init_net+0x169/0x550
[ 14.193955][ T12] ops_init+0x189/0x550
[ 14.194141][ T12] setup_net+0xf1/0x380
[ 14.194269][ T12] copy_net_ns+0x21a/0x380
[ 14.194427][ T12] create_new_namespaces+0x35f/0x900
[ 14.194586][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 14.194783][ T12] ksys_unshare+0x2a3/0x660
[ 14.194976][ T12] __x64_sys_unshare+0x31/0x40
[ 14.195132][ T12] do_syscall_64+0xc1/0xfd0
[ 14.195298][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.195489][ T12]
[ 14.195571][ T12] Freed by task 12:
[ 14.195692][ T12] kasan_save_stack+0x24/0x40
[ 14.195855][ T12] kasan_save_track+0x14/0x30
[ 14.196074][ T12] __kasan_save_free_info+0x3b/0x60
[ 14.196253][ T12] __kasan_slab_free+0x3f/0x60
[ 14.196418][ T12] kfree+0x21d/0x540
[ 14.196581][ T12] device_release+0x9c/0x210
[ 14.196772][ T12] kobject_cleanup+0xfe/0x360
[ 14.196929][ T12] netdev_run_todo+0x81f/0xc60
[ 14.197158][ T12] ops_undo_list+0x714/0x890
[ 14.197364][ T12] cleanup_net+0x3b2/0x830
[ 14.197621][ T12] process_one_work+0xe35/0x1650
[ 14.197785][ T12] worker_thread+0x591/0xcf0
[ 14.197939][ T12] kthread+0x37b/0x5f0
[ 14.198054][ T12] ret_from_fork+0x1db/0x270
[ 14.198226][ T12] ret_from_fork_asm+0x11/0x20
[ 14.198457][ T12]
[ 14.198542][ T12] The buggy address belongs to the object at ffff8880074cc000
[ 14.198542][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 14.198977][ T12] The buggy address is located 1684 bytes inside of
[ 14.198977][ T12] freed 4096-byte region [ffff8880074cc000, ffff8880074cd000)
[ 14.199436][ T12]
[ 14.199522][ T12] The buggy address belongs to the physical page:
[ 14.199712][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x74c8
[ 14.200066][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.200344][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.200597][ T12] page_type: f5(slab)
[ 14.200720][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000225810 ffffea00000a4210
[ 14.201048][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.201449][ T12] head: 0080000000000040 ffff888001043700 ffffea0000225810 ffffea00000a4210
[ 14.201867][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.202177][ T12] head: 0080000000000003 ffffea00001d3201 00000000ffffffff 00000000ffffffff
[ 14.202518][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.202790][ T12] page dumped because: kasan: bad access detected
[ 14.202991][ T12]
[ 14.203105][ T12] Memory state around the buggy address:
[ 14.203326][ T12] ffff8880074cc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.203578][ T12] ffff8880074cc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.203907][ T12] >ffff8880074cc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.204154][ T12] ^
[ 14.204326][ T12] ffff8880074cc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.204550][ T12] ffff8880074cc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.204793][ T12] ==================================================================
[ 14.205063][ T12] Disabling lock debugging due to kernel taint
[ 14.205265][ T12] ------------[ cut here ]------------
[ 14.205414][ T12] refcount_t: underflow; use-after-free.
[ 14.205626][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.205901][ T12] Modules linked in: veth
[ 14.206024][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.206508][ T12] Tainted: [B]=BAD_PAGE
[ 14.206694][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.206905][ T12] Workqueue: netns cleanup_net
[ 14.207080][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.207286][ 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 65 ad 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
[ 14.207843][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 14.208037][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.208295][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.208587][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5bfe134
[ 14.208821][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 14.209055][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.209314][ T12] FS: 0000000000000000(0000) GS:ffff888086e10000(0000) knlGS:0000000000000000
[ 14.209611][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.209822][ T12] CR2: 00007f6ef52575f0 CR3: 0000000007c18002 CR4: 0000000000772ef0
[ 14.210081][ T12] PKRU: 55555554
[ 14.210205][ T12] Call Trace:
[ 14.210331][ T12]
[ 14.210412][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.210591][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.210760][ T12] ? generic_xdp_install+0x410/0x410
[ 14.210931][ T12] ops_undo_list+0x714/0x890
[ 14.211084][ T12] ? netns_get+0x110/0x110
[ 14.211239][ T12] ? cleanup_net+0x2d6/0x830
[ 14.211401][ T12] cleanup_net+0x3b2/0x830
[ 14.211563][ T12] ? net_passive_dec+0x190/0x190
[ 14.211727][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.211896][ T12] process_one_work+0xe35/0x1650
[ 14.212067][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.212228][ T12] ? assign_work+0x168/0x240
[ 14.212387][ T12] worker_thread+0x591/0xcf0
[ 14.212557][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.212707][ T12] kthread+0x37b/0x5f0
[ 14.212821][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.212979][ T12] ? ret_from_fork+0x1b/0x270
[ 14.213144][ T12] ? __lock_release+0x5d/0x170
[ 14.213319][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.213495][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.213660][ T12] ret_from_fork+0x1db/0x270
[ 14.213815][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.214048][ T12] ret_from_fork_asm+0x11/0x20
[ 14.214207][ T12]
[ 14.214333][ T12] irq event stamp: 2703
[ 14.214524][ T12] hardirqs last enabled at (2703): [] irqentry_exit+0x3b/0x80
[ 14.214825][ T12] hardirqs last disabled at (2702): [] handle_softirqs+0x47f/0x610
[ 14.215116][ T12] softirqs last enabled at (2474): [] handle_softirqs+0x352/0x610
[ 14.215490][ T12] softirqs last disabled at (2463): [] irq_exit_rcu+0xab/0x100
[ 14.215798][ T12] ---[ end trace 0000000000000000 ]---