[ 23.417624][ T12] ==================================================================
[ 23.418081][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 23.418459][ T12] Read of size 1 at addr ffff88800b6c16c4 by task kworker/u16:0/12
[ 23.418821][ T12]
[ 23.418961][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 23.418969][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 23.418973][ T12] Workqueue: netns cleanup_net
[ 23.418987][ T12] Call Trace:
[ 23.418990][ T12]
[ 23.418993][ T12] dump_stack_lvl+0x82/0xc0
[ 23.419001][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 23.419016][ T12] ? kobject_put+0xbb/0xd0
[ 23.419023][ T12] print_report+0xb4/0x270
[ 23.419028][ T12] ? kobject_put+0xbb/0xd0
[ 23.419033][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 23.419039][ T12] ? kobject_put+0xbb/0xd0
[ 23.419044][ T12] kasan_report+0xca/0x100
[ 23.419051][ T12] ? kobject_put+0xbb/0xd0
[ 23.419059][ T12] kobject_put+0xbb/0xd0
[ 23.419065][ T12] netdev_run_todo+0x5f0/0xc60
[ 23.419075][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 23.419081][ T12] ? generic_xdp_install+0x410/0x410
[ 23.419085][ T12] ? net_generic+0xb1/0x1f0
[ 23.419101][ T12] ops_undo_list+0x714/0x890
[ 23.419110][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 23.419115][ T12] ? cleanup_net+0x2d6/0x8b0
[ 23.419125][ T12] cleanup_net+0x3b2/0x8b0
[ 23.419133][ T12] ? net_passive_dec+0x190/0x190
[ 23.419141][ T12] ? rcu_is_watching+0x12/0xb0
[ 23.419153][ T12] process_one_work+0xe35/0x1650
[ 23.419171][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 23.419182][ T12] ? assign_work+0x168/0x240
[ 23.419190][ T12] worker_thread+0x591/0xcf0
[ 23.419201][ T12] ? rescuer_thread+0xd10/0xd10
[ 23.419207][ T12] kthread+0x37b/0x5f0
[ 23.419214][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.419218][ T12] ? ret_from_fork+0x1b/0x270
[ 23.419227][ T12] ? __lock_release+0x5d/0x170
[ 23.419234][ T12] ? rcu_is_watching+0x12/0xb0
[ 23.419240][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.419245][ T12] ret_from_fork+0x1db/0x270
[ 23.419250][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.419255][ T12] ret_from_fork_asm+0x11/0x20
[ 23.419271][ T12]
[ 23.419273][ T12]
[ 23.428510][ T12] Allocated by task 259:
[ 23.428740][ T12] kasan_save_stack+0x24/0x40
[ 23.429006][ T12] kasan_save_track+0x14/0x30
[ 23.429263][ T12] __kasan_kmalloc+0x7b/0x90
[ 23.429515][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 23.429781][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 23.430041][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 23.430311][ T12] ops_init+0x189/0x550
[ 23.430506][ T12] setup_net+0xf1/0x380
[ 23.430696][ T12] copy_net_ns+0x253/0x510
[ 23.430948][ T12] create_new_namespaces+0x35f/0x900
[ 23.431214][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 23.431468][ T12] ksys_unshare+0x2be/0x6e0
[ 23.431726][ T12] __x64_sys_unshare+0x31/0x40
[ 23.431981][ T12] do_syscall_64+0xc1/0xfd0
[ 23.432248][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 23.432568][ T12]
[ 23.432699][ T12] Freed by task 12:
[ 23.432898][ T12] kasan_save_stack+0x24/0x40
[ 23.433153][ T12] kasan_save_track+0x14/0x30
[ 23.433411][ T12] __kasan_save_free_info+0x3b/0x60
[ 23.433673][ T12] __kasan_slab_free+0x3f/0x60
[ 23.433936][ T12] kfree+0x21d/0x540
[ 23.434136][ T12] device_release+0x9c/0x210
[ 23.434399][ T12] kobject_cleanup+0xfe/0x360
[ 23.434663][ T12] netdev_run_todo+0x81f/0xc60
[ 23.434922][ T12] ops_undo_list+0x714/0x890
[ 23.435182][ T12] cleanup_net+0x3b2/0x8b0
[ 23.435440][ T12] process_one_work+0xe35/0x1650
[ 23.435716][ T12] worker_thread+0x591/0xcf0
[ 23.435972][ T12] kthread+0x37b/0x5f0
[ 23.436172][ T12] ret_from_fork+0x1db/0x270
[ 23.436427][ T12] ret_from_fork_asm+0x11/0x20
[ 23.436687][ T12]
[ 23.436816][ T12] The buggy address belongs to the object at ffff88800b6c1000
[ 23.436816][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 23.437449][ T12] The buggy address is located 1732 bytes inside of
[ 23.437449][ T12] freed 4096-byte region [ffff88800b6c1000, ffff88800b6c2000)
[ 23.438075][ T12]
[ 23.438211][ T12] The buggy address belongs to the physical page:
[ 23.438520][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xb6c0
[ 23.439011][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 23.439413][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 23.439748][ T12] page_type: f5(slab)
[ 23.439949][ T12] raw: 0080000000000040 ffff888001043700 ffffea00002ce610 ffffea0000330c10
[ 23.440412][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 23.440855][ T12] head: 0080000000000040 ffff888001043700 ffffea00002ce610 ffffea0000330c10
[ 23.441331][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 23.441776][ T12] head: 0080000000000003 ffffea00002db001 00000000ffffffff 00000000ffffffff
[ 23.442228][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 23.442675][ T12] page dumped because: kasan: bad access detected
[ 23.442986][ T12]
[ 23.443124][ T12] Memory state around the buggy address:
[ 23.443385][ T12] ffff88800b6c1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.443752][ T12] ffff88800b6c1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.444111][ T12] >ffff88800b6c1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.444477][ T12] ^
[ 23.444777][ T12] ffff88800b6c1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.445149][ T12] ffff88800b6c1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.445514][ T12] ==================================================================
[ 23.446103][ T12] Disabling lock debugging due to kernel taint
[ 23.446337][ T12] ------------[ cut here ]------------
[ 23.446492][ T12] refcount_t: underflow; use-after-free.
[ 23.446750][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 23.447141][ T12] Modules linked in:
[ 23.447329][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 23.447918][ T12] Tainted: [B]=BAD_PAGE
[ 23.448134][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 23.448452][ T12] Workqueue: netns cleanup_net
[ 23.448730][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 23.449070][ 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 93 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
[ 23.449991][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 23.450329][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 23.450728][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 23.451051][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff28c0934
[ 23.451331][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 23.451617][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 23.451880][ T12] FS: 0000000000000000(0000) GS:ffff8880d7688000(0000) knlGS:0000000000000000
[ 23.452189][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 23.452397][ T12] CR2: 00007f9e2c693000 CR3: 0000000050b49006 CR4: 0000000000772ef0
[ 23.452631][ T12] PKRU: 55555554
[ 23.452794][ T12] Call Trace:
[ 23.452934][ T12]
[ 23.453019][ T12] netdev_run_todo+0x5f0/0xc60
[ 23.453185][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 23.453350][ T12] ? generic_xdp_install+0x410/0x410
[ 23.453511][ T12] ? net_generic+0xb1/0x1f0
[ 23.453671][ T12] ops_undo_list+0x714/0x890
[ 23.453925][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 23.454090][ T12] ? cleanup_net+0x2d6/0x8b0
[ 23.454246][ T12] cleanup_net+0x3b2/0x8b0
[ 23.454427][ T12] ? net_passive_dec+0x190/0x190
[ 23.454671][ T12] ? rcu_is_watching+0x12/0xb0
[ 23.454923][ T12] process_one_work+0xe35/0x1650
[ 23.455083][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 23.455245][ T12] ? assign_work+0x168/0x240
[ 23.455439][ T12] worker_thread+0x591/0xcf0
[ 23.455690][ T12] ? rescuer_thread+0xd10/0xd10
[ 23.455852][ T12] kthread+0x37b/0x5f0
[ 23.455979][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.456140][ T12] ? ret_from_fork+0x1b/0x270
[ 23.456291][ T12] ? __lock_release+0x5d/0x170
[ 23.456452][ T12] ? rcu_is_watching+0x12/0xb0
[ 23.456692][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.456851][ T12] ret_from_fork+0x1db/0x270
[ 23.456999][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 23.457148][ T12] ret_from_fork_asm+0x11/0x20
[ 23.457303][ T12]
[ 23.457441][ T12] irq event stamp: 19415
[ 23.457558][ T12] hardirqs last enabled at (19415): [] finish_task_switch.isra.0+0x245/0x960
[ 23.457903][ T12] hardirqs last disabled at (19414): [] __schedule+0x94a/0x1b10
[ 23.458285][ T12] softirqs last enabled at (19180): [] handle_softirqs+0x352/0x610
[ 23.458666][ T12] softirqs last disabled at (18559): [] irq_exit_rcu+0xab/0x100
[ 23.458987][ T12] ---[ end trace 0000000000000000 ]---