[ 21.256397][ T12] ==================================================================
[ 21.256713][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 21.257016][ T12] Read of size 1 at addr ffff8880099d96c4 by task kworker/u16:0/12
[ 21.257280][ T12]
[ 21.257372][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.257378][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.257382][ T12] Workqueue: netns cleanup_net
[ 21.257392][ T12] Call Trace:
[ 21.257394][ T12]
[ 21.257397][ T12] dump_stack_lvl+0x82/0xc0
[ 21.257404][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 21.257412][ T12] ? kobject_put+0xbb/0xd0
[ 21.257416][ T12] print_report+0xb4/0x270
[ 21.257420][ T12] ? kobject_put+0xbb/0xd0
[ 21.257423][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 21.257426][ T12] ? kobject_put+0xbb/0xd0
[ 21.257429][ T12] kasan_report+0xca/0x100
[ 21.257433][ T12] ? kobject_put+0xbb/0xd0
[ 21.257439][ T12] kobject_put+0xbb/0xd0
[ 21.257442][ T12] netdev_run_todo+0x5f0/0xc60
[ 21.257449][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 21.257453][ T12] ? generic_xdp_install+0x410/0x410
[ 21.257456][ T12] ? net_generic+0xb1/0x1f0
[ 21.257465][ T12] ops_undo_list+0x714/0x890
[ 21.257471][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.257474][ T12] ? cleanup_net+0x2d6/0x8b0
[ 21.257480][ T12] cleanup_net+0x3b2/0x8b0
[ 21.257484][ T12] ? net_passive_dec+0x190/0x190
[ 21.257489][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.257497][ T12] process_one_work+0xe35/0x1650
[ 21.257507][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.257513][ T12] ? assign_work+0x168/0x240
[ 21.257517][ T12] worker_thread+0x591/0xcf0
[ 21.257523][ T12] ? rescuer_thread+0xd10/0xd10
[ 21.257527][ T12] kthread+0x37b/0x5f0
[ 21.257532][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.257535][ T12] ? ret_from_fork+0x1b/0x270
[ 21.257540][ T12] ? __lock_release+0x5d/0x170
[ 21.257545][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.257548][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.257552][ T12] ret_from_fork+0x1db/0x270
[ 21.257555][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.257558][ T12] ret_from_fork_asm+0x11/0x20
[ 21.257569][ T12]
[ 21.257571][ T12]
[ 21.264485][ T12] Allocated by task 260:
[ 21.264636][ T12] kasan_save_stack+0x24/0x40
[ 21.264850][ T12] kasan_save_track+0x14/0x30
[ 21.265015][ T12] __kasan_kmalloc+0x7b/0x90
[ 21.265185][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 21.265371][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 21.265637][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 21.265883][ T12] ops_init+0x189/0x550
[ 21.266044][ T12] setup_net+0xf1/0x380
[ 21.266300][ T12] copy_net_ns+0x253/0x510
[ 21.266499][ T12] create_new_namespaces+0x35f/0x900
[ 21.266694][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 21.266920][ T12] ksys_unshare+0x2be/0x6e0
[ 21.267180][ T12] __x64_sys_unshare+0x31/0x40
[ 21.267349][ T12] do_syscall_64+0xc1/0xfd0
[ 21.267517][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.267836][ T12]
[ 21.267918][ T12] Freed by task 12:
[ 21.268039][ T12] kasan_save_stack+0x24/0x40
[ 21.268211][ T12] kasan_save_track+0x14/0x30
[ 21.268390][ T12] __kasan_save_free_info+0x3b/0x60
[ 21.268644][ T12] __kasan_slab_free+0x3f/0x60
[ 21.268877][ T12] kfree+0x21d/0x540
[ 21.269003][ T12] device_release+0x9c/0x210
[ 21.269179][ T12] kobject_cleanup+0xfe/0x360
[ 21.269358][ T12] netdev_run_todo+0x81f/0xc60
[ 21.269797][ T12] ops_undo_list+0x714/0x890
[ 21.269973][ T12] cleanup_net+0x3b2/0x8b0
[ 21.270149][ T12] process_one_work+0xe35/0x1650
[ 21.270321][ T12] worker_thread+0x591/0xcf0
[ 21.270493][ T12] kthread+0x37b/0x5f0
[ 21.270610][ T12] ret_from_fork+0x1db/0x270
[ 21.270819][ T12] ret_from_fork_asm+0x11/0x20
[ 21.271000][ T12]
[ 21.271223][ T12] The buggy address belongs to the object at ffff8880099d9000
[ 21.271223][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 21.271738][ T12] The buggy address is located 1732 bytes inside of
[ 21.271738][ T12] freed 4096-byte region [ffff8880099d9000, ffff8880099da000)
[ 21.272323][ T12]
[ 21.272428][ T12] The buggy address belongs to the physical page:
[ 21.272675][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x99d8
[ 21.272972][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 21.273259][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 21.273501][ T12] page_type: f5(slab)
[ 21.273719][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002eba10 ffffea0000390e10
[ 21.274016][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.274300][ T12] head: 0080000000000040 ffff888001043700 ffffea00002eba10 ffffea0000390e10
[ 21.274666][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 21.274954][ T12] head: 0080000000000003 ffffea0000267601 00000000ffffffff 00000000ffffffff
[ 21.275525][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.275814][ T12] page dumped because: kasan: bad access detected
[ 21.276069][ T12]
[ 21.276282][ T12] Memory state around the buggy address:
[ 21.276458][ T12] ffff8880099d9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.276746][ T12] ffff8880099d9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.277077][ T12] >ffff8880099d9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.277342][ T12] ^
[ 21.277612][ T12] ffff8880099d9700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.277847][ T12] ffff8880099d9780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.278075][ T12] ==================================================================
[ 21.278653][ T12] Disabling lock debugging due to kernel taint
[ 21.279008][ T12] ------------[ cut here ]------------
[ 21.279253][ T12] refcount_t: underflow; use-after-free.
[ 21.279544][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.280089][ T12] Modules linked in:
[ 21.280294][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.280935][ T12] Tainted: [B]=BAD_PAGE
[ 21.281158][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.281506][ T12] Workqueue: netns cleanup_net
[ 21.281793][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.282138][ 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 a9 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
[ 21.282987][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 21.283233][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.283534][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.283795][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff54c0934
[ 21.284092][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 21.284325][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.284567][ T12] FS: 0000000000000000(0000) GS:ffff8880c1588000(0000) knlGS:0000000000000000
[ 21.284897][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.285111][ T12] CR2: 000056084cbdadec CR3: 000000000ac98001 CR4: 0000000000772ef0
[ 21.285351][ T12] PKRU: 55555554
[ 21.285516][ T12] Call Trace:
[ 21.285640][ T12]
[ 21.285727][ T12] netdev_run_todo+0x5f0/0xc60
[ 21.285892][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 21.286044][ T12] ? generic_xdp_install+0x410/0x410
[ 21.286198][ T12] ? net_generic+0xb1/0x1f0
[ 21.286447][ T12] ops_undo_list+0x714/0x890
[ 21.286673][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 21.286904][ T12] ? cleanup_net+0x2d6/0x8b0
[ 21.287134][ T12] cleanup_net+0x3b2/0x8b0
[ 21.287364][ T12] ? net_passive_dec+0x190/0x190
[ 21.287625][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.287873][ T12] process_one_work+0xe35/0x1650
[ 21.288160][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 21.288401][ T12] ? assign_work+0x168/0x240
[ 21.288681][ T12] worker_thread+0x591/0xcf0
[ 21.288926][ T12] ? rescuer_thread+0xd10/0xd10
[ 21.289170][ T12] kthread+0x37b/0x5f0
[ 21.289361][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.289621][ T12] ? ret_from_fork+0x1b/0x270
[ 21.289874][ T12] ? __lock_release+0x5d/0x170
[ 21.290121][ T12] ? rcu_is_watching+0x12/0xb0
[ 21.290390][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.290666][ T12] ret_from_fork+0x1db/0x270
[ 21.290896][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 21.291113][ T12] ret_from_fork_asm+0x11/0x20
[ 21.291273][ T12]
[ 21.291409][ T12] irq event stamp: 10663
[ 21.291552][ T12] hardirqs last enabled at (10663): [] finish_task_switch.isra.0+0x245/0x960
[ 21.291891][ T12] hardirqs last disabled at (10662): [] __schedule+0x94a/0x1b10
[ 21.292164][ T12] softirqs last enabled at (10304): [] handle_softirqs+0x352/0x610
[ 21.292435][ T12] softirqs last disabled at (10299): [] irq_exit_rcu+0xab/0x100
[ 21.292694][ T12] ---[ end trace 0000000000000000 ]---