[ 18.916188][ T69] ==================================================================
[ 18.916500][ T69] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 18.916766][ T69] Read of size 1 at addr ffff8880082796c4 by task kworker/u16:1/69
[ 18.917028][ T69]
[ 18.917121][ T69] CPU: 0 UID: 0 PID: 69 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.917127][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.917130][ T69] Workqueue: netns cleanup_net
[ 18.917141][ T69] Call Trace:
[ 18.917143][ T69]
[ 18.917146][ T69] dump_stack_lvl+0x82/0xc0
[ 18.917153][ T69] print_address_description.constprop.0+0x2c/0x3a0
[ 18.917165][ T69] ? kobject_put+0xbb/0xd0
[ 18.917170][ T69] print_report+0xb4/0x270
[ 18.917175][ T69] ? kobject_put+0xbb/0xd0
[ 18.917179][ T69] ? kasan_addr_to_slab+0x21/0x70
[ 18.917183][ T69] ? kobject_put+0xbb/0xd0
[ 18.917186][ T69] kasan_report+0xca/0x100
[ 18.917190][ T69] ? kobject_put+0xbb/0xd0
[ 18.917195][ T69] kobject_put+0xbb/0xd0
[ 18.917199][ T69] netdev_run_todo+0x5f0/0xc60
[ 18.917207][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 18.917211][ T69] ? generic_xdp_install+0x410/0x410
[ 18.917214][ T69] ? net_generic+0xb1/0x1f0
[ 18.917224][ T69] ops_undo_list+0x714/0x890
[ 18.917230][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 18.917233][ T69] ? cleanup_net+0x2d6/0x8b0
[ 18.917239][ T69] cleanup_net+0x3b2/0x8b0
[ 18.917243][ T69] ? net_passive_dec+0x190/0x190
[ 18.917248][ T69] ? rcu_is_watching+0x12/0xb0
[ 18.917256][ T69] process_one_work+0xe35/0x1650
[ 18.917267][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 18.917273][ T69] ? assign_work+0x168/0x240
[ 18.917277][ T69] worker_thread+0x591/0xcf0
[ 18.917283][ T69] ? rescuer_thread+0xd10/0xd10
[ 18.917287][ T69] kthread+0x37b/0x5f0
[ 18.917291][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.917293][ T69] ? ret_from_fork+0x1b/0x270
[ 18.917299][ T69] ? __lock_release+0x5d/0x170
[ 18.917304][ T69] ? rcu_is_watching+0x12/0xb0
[ 18.917308][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.917311][ T69] ret_from_fork+0x1db/0x270
[ 18.917314][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.917317][ T69] ret_from_fork_asm+0x11/0x20
[ 18.917328][ T69]
[ 18.917330][ T69]
[ 18.924237][ T69] Allocated by task 258:
[ 18.924370][ T69] kasan_save_stack+0x24/0x40
[ 18.924559][ T69] kasan_save_track+0x14/0x30
[ 18.924733][ T69] __kasan_kmalloc+0x7b/0x90
[ 18.924902][ T69] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 18.925071][ T69] alloc_netdev_mqs+0x7d/0x1370
[ 18.925264][ T69] ip6_tnl_init_net+0x102/0x3f0
[ 18.925439][ T69] ops_init+0x189/0x550
[ 18.925567][ T69] setup_net+0xf1/0x380
[ 18.925698][ T69] copy_net_ns+0x253/0x510
[ 18.925867][ T69] create_new_namespaces+0x35f/0x900
[ 18.926050][ T69] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 18.926232][ T69] ksys_unshare+0x2be/0x6e0
[ 18.926406][ T69] __x64_sys_unshare+0x31/0x40
[ 18.926570][ T69] do_syscall_64+0xc1/0xfd0
[ 18.926741][ T69] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.926955][ T69]
[ 18.927046][ T69] Freed by task 69:
[ 18.927175][ T69] kasan_save_stack+0x24/0x40
[ 18.927370][ T69] kasan_save_track+0x14/0x30
[ 18.927540][ T69] __kasan_save_free_info+0x3b/0x60
[ 18.927728][ T69] __kasan_slab_free+0x3f/0x60
[ 18.927897][ T69] kfree+0x21d/0x540
[ 18.928023][ T69] device_release+0x9c/0x210
[ 18.928197][ T69] kobject_cleanup+0xfe/0x360
[ 18.928411][ T69] netdev_run_todo+0x81f/0xc60
[ 18.928589][ T69] ops_undo_list+0x714/0x890
[ 18.928771][ T69] cleanup_net+0x3b2/0x8b0
[ 18.928940][ T69] process_one_work+0xe35/0x1650
[ 18.929116][ T69] worker_thread+0x591/0xcf0
[ 18.929297][ T69] kthread+0x37b/0x5f0
[ 18.929428][ T69] ret_from_fork+0x1db/0x270
[ 18.929601][ T69] ret_from_fork_asm+0x11/0x20
[ 18.929772][ T69]
[ 18.929861][ T69] The buggy address belongs to the object at ffff888008279000
[ 18.929861][ T69] which belongs to the cache kmalloc-4k of size 4096
[ 18.930276][ T69] The buggy address is located 1732 bytes inside of
[ 18.930276][ T69] freed 4096-byte region [ffff888008279000, ffff88800827a000)
[ 18.930696][ T69]
[ 18.930784][ T69] The buggy address belongs to the physical page:
[ 18.931005][ T69] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8278
[ 18.931326][ T69] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 18.931595][ T69] flags: 0x80000000000040(head|node=0|zone=1)
[ 18.931814][ T69] page_type: f5(slab)
[ 18.931960][ T69] raw: 0080000000000040 ffff888001043700 ffffea0000201a10 ffffea0000222210
[ 18.932275][ T69] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 18.932597][ T69] head: 0080000000000040 ffff888001043700 ffffea0000201a10 ffffea0000222210
[ 18.932908][ T69] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 18.933209][ T69] head: 0080000000000003 ffffea0000209e01 00000000ffffffff 00000000ffffffff
[ 18.933524][ T69] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 18.933829][ T69] page dumped because: kasan: bad access detected
[ 18.934048][ T69]
[ 18.934138][ T69] Memory state around the buggy address:
[ 18.934303][ T69] ffff888008279580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.934574][ T69] ffff888008279600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.934817][ T69] >ffff888008279680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.935079][ T69] ^
[ 18.935289][ T69] ffff888008279700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.935551][ T69] ffff888008279780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 18.935796][ T69] ==================================================================
[ 18.936128][ T69] Disabling lock debugging due to kernel taint
[ 18.936375][ T69] ------------[ cut here ]------------
[ 18.936535][ T69] refcount_t: underflow; use-after-free.
[ 18.936862][ T69] WARNING: CPU: 1 PID: 69 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.937238][ T69] Modules linked in: sch_fq
[ 18.937424][ T69] CPU: 1 UID: 0 PID: 69 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.937916][ T69] Tainted: [B]=BAD_PAGE
[ 18.938058][ T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.938295][ T69] Workqueue: netns cleanup_net
[ 18.938477][ T69] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.938718][ T69] 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 85 aa 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
[ 18.939353][ T69] RSP: 0018:ffffc900004a7a08 EFLAGS: 00010282
[ 18.939569][ T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.939862][ T69] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.940159][ T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5700934
[ 18.940442][ T69] R10: 0000000000000003 R11: ffffc900004a7580 R12: 0000000000000001
[ 18.940729][ T69] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.941034][ T69] FS: 0000000000000000(0000) GS:ffff8880c0388000(0000) knlGS:0000000000000000
[ 18.941357][ T69] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.941601][ T69] CR2: 00005611f8340880 CR3: 0000000004c87003 CR4: 0000000000772ef0
[ 18.941908][ T69] PKRU: 55555554
[ 18.942054][ T69] Call Trace:
[ 18.942195][ T69]
[ 18.942293][ T69] netdev_run_todo+0x5f0/0xc60
[ 18.942492][ T69] ? dev_ingress_queue_create+0x190/0x190
[ 18.942679][ T69] ? generic_xdp_install+0x410/0x410
[ 18.942876][ T69] ? net_generic+0xb1/0x1f0
[ 18.943094][ T69] ops_undo_list+0x714/0x890
[ 18.943283][ T69] ? rtnl_net_dumpid_one+0x270/0x270
[ 18.943466][ T69] ? cleanup_net+0x2d6/0x8b0
[ 18.943652][ T69] cleanup_net+0x3b2/0x8b0
[ 18.943859][ T69] ? net_passive_dec+0x190/0x190
[ 18.944064][ T69] ? rcu_is_watching+0x12/0xb0
[ 18.944255][ T69] process_one_work+0xe35/0x1650
[ 18.944444][ T69] ? pwq_dec_nr_in_flight+0x550/0x550
[ 18.944633][ T69] ? assign_work+0x168/0x240
[ 18.944825][ T69] worker_thread+0x591/0xcf0
[ 18.945037][ T69] ? rescuer_thread+0xd10/0xd10
[ 18.945223][ T69] kthread+0x37b/0x5f0
[ 18.945349][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.945512][ T69] ? ret_from_fork+0x1b/0x270
[ 18.945780][ T69] ? __lock_release+0x5d/0x170
[ 18.945976][ T69] ? rcu_is_watching+0x12/0xb0
[ 18.946152][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.946330][ T69] ret_from_fork+0x1db/0x270
[ 18.946583][ T69] ? kthread_is_per_cpu+0xc0/0xc0
[ 18.946753][ T69] ret_from_fork_asm+0x11/0x20
[ 18.946949][ T69]
[ 18.947079][ T69] irq event stamp: 16345
[ 18.947304][ T69] hardirqs last enabled at (16345): [] finish_task_switch.isra.0+0x245/0x960
[ 18.947632][ T69] hardirqs last disabled at (16344): [] __schedule+0x94a/0x1b10
[ 18.948053][ T69] softirqs last enabled at (16174): [] handle_softirqs+0x352/0x610
[ 18.948360][ T69] softirqs last disabled at (16165): [] irq_exit_rcu+0xab/0x100
[ 18.948644][ T69] ---[ end trace 0000000000000000 ]---