[ 20.066331][ T12] ==================================================================
[ 20.066635][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 20.066913][ T12] Read of size 1 at addr ffff88800c5fc6c4 by task kworker/u16:0/12
[ 20.067152][ T12]
[ 20.067248][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.067253][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.067256][ T12] Workqueue: netns cleanup_net
[ 20.067273][ T12] Call Trace:
[ 20.067276][ T12]
[ 20.067279][ T12] dump_stack_lvl+0x82/0xc0
[ 20.067288][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 20.067299][ T12] ? kobject_put+0xbb/0xd0
[ 20.067303][ T12] print_report+0xb4/0x270
[ 20.067307][ T12] ? kobject_put+0xbb/0xd0
[ 20.067310][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 20.067313][ T12] ? kobject_put+0xbb/0xd0
[ 20.067316][ T12] kasan_report+0xca/0x100
[ 20.067320][ T12] ? kobject_put+0xbb/0xd0
[ 20.067326][ T12] kobject_put+0xbb/0xd0
[ 20.067329][ T12] netdev_run_todo+0x5f0/0xc60
[ 20.067336][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 20.067340][ T12] ? generic_xdp_install+0x410/0x410
[ 20.067342][ T12] ? net_generic+0xb1/0x1f0
[ 20.067354][ T12] ops_undo_list+0x714/0x890
[ 20.067360][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 20.067363][ T12] ? cleanup_net+0x2d6/0x8b0
[ 20.067369][ T12] cleanup_net+0x3b2/0x8b0
[ 20.067374][ T12] ? net_passive_dec+0x190/0x190
[ 20.067378][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.067392][ T12] process_one_work+0xe35/0x1650
[ 20.067404][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 20.067410][ T12] ? assign_work+0x168/0x240
[ 20.067414][ T12] worker_thread+0x591/0xcf0
[ 20.067420][ T12] ? rescuer_thread+0xd10/0xd10
[ 20.067424][ T12] kthread+0x37b/0x5f0
[ 20.067428][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.067430][ T12] ? ret_from_fork+0x1b/0x270
[ 20.067438][ T12] ? __lock_release+0x5d/0x170
[ 20.067444][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.067448][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.067452][ T12] ret_from_fork+0x1db/0x270
[ 20.067454][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.067457][ T12] ret_from_fork_asm+0x11/0x20
[ 20.067471][ T12]
[ 20.067472][ T12]
[ 20.074278][ T12] Allocated by task 271:
[ 20.074403][ T12] kasan_save_stack+0x24/0x40
[ 20.074576][ T12] kasan_save_track+0x14/0x30
[ 20.074745][ T12] __kasan_kmalloc+0x7b/0x90
[ 20.074943][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 20.075145][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 20.075354][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 20.075522][ T12] ops_init+0x189/0x550
[ 20.075650][ T12] setup_net+0xf1/0x380
[ 20.075794][ T12] copy_net_ns+0x253/0x510
[ 20.075983][ T12] create_new_namespaces+0x35f/0x900
[ 20.076143][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 20.076309][ T12] ksys_unshare+0x2be/0x6e0
[ 20.076514][ T12] __x64_sys_unshare+0x31/0x40
[ 20.076695][ T12] do_syscall_64+0xc1/0xfd0
[ 20.076856][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.077071][ T12]
[ 20.077180][ T12] Freed by task 12:
[ 20.077302][ T12] kasan_save_stack+0x24/0x40
[ 20.077460][ T12] kasan_save_track+0x14/0x30
[ 20.077630][ T12] __kasan_save_free_info+0x3b/0x60
[ 20.077828][ T12] __kasan_slab_free+0x3f/0x60
[ 20.077991][ T12] kfree+0x21d/0x540
[ 20.078108][ T12] device_release+0x9c/0x210
[ 20.078279][ T12] kobject_cleanup+0xfe/0x360
[ 20.078459][ T12] netdev_run_todo+0x81f/0xc60
[ 20.078645][ T12] ops_undo_list+0x714/0x890
[ 20.078851][ T12] cleanup_net+0x3b2/0x8b0
[ 20.079006][ T12] process_one_work+0xe35/0x1650
[ 20.079168][ T12] worker_thread+0x591/0xcf0
[ 20.079345][ T12] kthread+0x37b/0x5f0
[ 20.079511][ T12] ret_from_fork+0x1db/0x270
[ 20.079707][ T12] ret_from_fork_asm+0x11/0x20
[ 20.079911][ T12]
[ 20.080035][ T12] The buggy address belongs to the object at ffff88800c5fc000
[ 20.080035][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 20.080524][ T12] The buggy address is located 1732 bytes inside of
[ 20.080524][ T12] freed 4096-byte region [ffff88800c5fc000, ffff88800c5fd000)
[ 20.081003][ T12]
[ 20.081092][ T12] The buggy address belongs to the physical page:
[ 20.081307][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc5f8
[ 20.081668][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 20.081943][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 20.082211][ T12] page_type: f5(slab)
[ 20.082365][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000328610 ffffea00003bfc10
[ 20.082768][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 20.083079][ T12] head: 0080000000000040 ffff888001043700 ffffea0000328610 ffffea00003bfc10
[ 20.083535][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 20.083892][ T12] head: 0080000000000003 ffffea0000317e01 00000000ffffffff 00000000ffffffff
[ 20.084241][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 20.084612][ T12] page dumped because: kasan: bad access detected
[ 20.084808][ T12]
[ 20.084915][ T12] Memory state around the buggy address:
[ 20.085183][ T12] ffff88800c5fc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.085411][ T12] ffff88800c5fc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.085632][ T12] >ffff88800c5fc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.085954][ T12] ^
[ 20.086184][ T12] ffff88800c5fc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.086410][ T12] ffff88800c5fc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.086716][ T12] ==================================================================
[ 20.087151][ T12] Disabling lock debugging due to kernel taint
[ 20.087438][ T12] ------------[ cut here ]------------
[ 20.087606][ T12] refcount_t: underflow; use-after-free.
[ 20.087999][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.088496][ T12] Modules linked in:
[ 20.088714][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.089351][ T12] Tainted: [B]=BAD_PAGE
[ 20.089568][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.089852][ T12] Workqueue: netns cleanup_net
[ 20.090154][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.090467][ 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 45 86 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
[ 20.091385][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 20.091633][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.091990][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.092275][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0e80934
[ 20.092635][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 20.092983][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.093325][ T12] FS: 0000000000000000(0000) GS:ffff8880de308000(0000) knlGS:0000000000000000
[ 20.093779][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.094103][ T12] CR2: 00007f468e25f920 CR3: 000000006c349004 CR4: 0000000000772ef0
[ 20.094507][ T12] PKRU: 55555554
[ 20.094707][ T12] Call Trace:
[ 20.094909][ T12]
[ 20.095066][ T12] netdev_run_todo+0x5f0/0xc60
[ 20.095347][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 20.095532][ T12] ? generic_xdp_install+0x410/0x410
[ 20.095739][ T12] ? net_generic+0xb1/0x1f0
[ 20.096026][ T12] ops_undo_list+0x714/0x890
[ 20.096312][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 20.096593][ T12] ? cleanup_net+0x2d6/0x8b0
[ 20.096864][ T12] cleanup_net+0x3b2/0x8b0
[ 20.097146][ T12] ? net_passive_dec+0x190/0x190
[ 20.097385][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.097571][ T12] process_one_work+0xe35/0x1650
[ 20.097784][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 20.098077][ T12] ? assign_work+0x168/0x240
[ 20.098261][ T12] worker_thread+0x591/0xcf0
[ 20.098530][ T12] ? rescuer_thread+0xd10/0xd10
[ 20.098801][ T12] kthread+0x37b/0x5f0
[ 20.099026][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.099299][ T12] ? ret_from_fork+0x1b/0x270
[ 20.099557][ T12] ? __lock_release+0x5d/0x170
[ 20.099998][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.100275][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.100717][ T12] ret_from_fork+0x1db/0x270
[ 20.100992][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.101256][ T12] ret_from_fork_asm+0x11/0x20
[ 20.101533][ T12]
[ 20.101738][ T12] irq event stamp: 9853
[ 20.101958][ T12] hardirqs last enabled at (9853): [] finish_task_switch.isra.0+0x245/0x960
[ 20.102369][ T12] hardirqs last disabled at (9852): [] __schedule+0x94a/0x1b10
[ 20.102812][ T12] softirqs last enabled at (9684): [] handle_softirqs+0x352/0x610
[ 20.103324][ T12] softirqs last disabled at (9467): [] irq_exit_rcu+0xab/0x100
[ 20.103797][ T12] ---[ end trace 0000000000000000 ]---