[ 30.696926][ T12] ==================================================================
[ 30.697234][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 30.697514][ T12] Read of size 1 at addr ffff8880091a16ac by task kworker/u16:0/12
[ 30.697770][ T12]
[ 30.697881][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.697887][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.697891][ T12] Workqueue: netns cleanup_net
[ 30.697901][ T12] Call Trace:
[ 30.697904][ T12]
[ 30.697907][ T12] dump_stack_lvl+0x82/0xc0
[ 30.697914][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 30.697923][ T12] ? kobject_put+0xbb/0xd0
[ 30.697927][ T12] print_report+0xb4/0x270
[ 30.697930][ T12] ? kobject_put+0xbb/0xd0
[ 30.697934][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 30.697938][ T12] ? kobject_put+0xbb/0xd0
[ 30.697941][ T12] kasan_report+0xca/0x100
[ 30.697945][ T12] ? kobject_put+0xbb/0xd0
[ 30.697951][ T12] kobject_put+0xbb/0xd0
[ 30.697955][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.697963][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.697967][ T12] ? generic_xdp_install+0x410/0x410
[ 30.697974][ T12] ops_undo_list+0x714/0x890
[ 30.697983][ T12] ? netns_get+0x110/0x110
[ 30.697987][ T12] ? cleanup_net+0x2d6/0x830
[ 30.697992][ T12] cleanup_net+0x3b2/0x830
[ 30.697995][ T12] ? net_passive_dec+0x190/0x190
[ 30.697999][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.698006][ T12] process_one_work+0xe35/0x1650
[ 30.698015][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.698021][ T12] ? assign_work+0x168/0x240
[ 30.698025][ T12] worker_thread+0x591/0xcf0
[ 30.698031][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.698035][ T12] kthread+0x37b/0x5f0
[ 30.698039][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.698042][ T12] ? ret_from_fork+0x1b/0x270
[ 30.698049][ T12] ? __lock_release+0x5d/0x170
[ 30.698056][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.698059][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.698062][ T12] ret_from_fork+0x1db/0x270
[ 30.698065][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.698068][ T12] ret_from_fork_asm+0x11/0x20
[ 30.698077][ T12]
[ 30.698078][ T12]
[ 30.704724][ T12] Allocated by task 244:
[ 30.704868][ T12] kasan_save_stack+0x24/0x40
[ 30.705065][ T12] kasan_save_track+0x14/0x30
[ 30.705220][ T12] __kasan_kmalloc+0x7b/0x90
[ 30.705388][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 30.705547][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 30.705710][ T12] sit_init_net+0x169/0x550
[ 30.705892][ T12] ops_init+0x189/0x550
[ 30.706016][ T12] setup_net+0xf1/0x380
[ 30.706133][ T12] copy_net_ns+0x21a/0x380
[ 30.706299][ T12] create_new_namespaces+0x35f/0x900
[ 30.706507][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 30.706680][ T12] ksys_unshare+0x2a3/0x660
[ 30.706872][ T12] __x64_sys_unshare+0x31/0x40
[ 30.707041][ T12] do_syscall_64+0xc1/0xfd0
[ 30.707218][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 30.707443][ T12]
[ 30.707530][ T12] Freed by task 12:
[ 30.707663][ T12] kasan_save_stack+0x24/0x40
[ 30.707860][ T12] kasan_save_track+0x14/0x30
[ 30.708036][ T12] __kasan_save_free_info+0x3b/0x60
[ 30.708208][ T12] __kasan_slab_free+0x3f/0x60
[ 30.708388][ T12] kfree+0x21d/0x540
[ 30.708524][ T12] device_release+0x9c/0x210
[ 30.708704][ T12] kobject_cleanup+0xfe/0x360
[ 30.708899][ T12] netdev_run_todo+0x81f/0xc60
[ 30.709073][ T12] ops_undo_list+0x714/0x890
[ 30.709247][ T12] cleanup_net+0x3b2/0x830
[ 30.709423][ T12] process_one_work+0xe35/0x1650
[ 30.709595][ T12] worker_thread+0x591/0xcf0
[ 30.709768][ T12] kthread+0x37b/0x5f0
[ 30.709912][ T12] ret_from_fork+0x1db/0x270
[ 30.710087][ T12] ret_from_fork_asm+0x11/0x20
[ 30.710267][ T12]
[ 30.710364][ T12] The buggy address belongs to the object at ffff8880091a1000
[ 30.710364][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 30.710778][ T12] The buggy address is located 1708 bytes inside of
[ 30.710778][ T12] freed 4096-byte region [ffff8880091a1000, ffff8880091a2000)
[ 30.711209][ T12]
[ 30.711308][ T12] The buggy address belongs to the physical page:
[ 30.711519][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x91a0
[ 30.711834][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 30.712104][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 30.712335][ T12] page_type: f5(slab)
[ 30.712471][ T12] raw: 0080000000000040 ffff888001043700 ffffea000022ee10 ffffea0000225c10
[ 30.712793][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.713131][ T12] head: 0080000000000040 ffff888001043700 ffffea000022ee10 ffffea0000225c10
[ 30.713446][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 30.713863][ T12] head: 0080000000000003 ffffea0000246801 00000000ffffffff 00000000ffffffff
[ 30.714165][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 30.714565][ T12] page dumped because: kasan: bad access detected
[ 30.714798][ T12]
[ 30.714903][ T12] Memory state around the buggy address:
[ 30.715072][ T12] ffff8880091a1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.715424][ T12] ffff8880091a1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.715667][ T12] >ffff8880091a1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.715941][ T12] ^
[ 30.716204][ T12] ffff8880091a1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.716459][ T12] ffff8880091a1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 30.716709][ T12] ==================================================================
[ 30.717129][ T12] Disabling lock debugging due to kernel taint
[ 30.717510][ T12] ------------[ cut here ]------------
[ 30.717693][ T12] refcount_t: underflow; use-after-free.
[ 30.717932][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 30.718268][ T12] Modules linked in: nf_tables
[ 30.718484][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 30.718906][ T12] Tainted: [B]=BAD_PAGE
[ 30.719063][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 30.719422][ T12] Workqueue: netns cleanup_net
[ 30.719641][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 30.719898][ T12] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de 85 93 e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 30.720566][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 30.720817][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 30.721102][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 30.721397][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff283e220
[ 30.721686][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 30.721974][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 30.722259][ T12] FS: 0000000000000000(0000) GS:ffff8880a0cec000(0000) knlGS:0000000000000000
[ 30.722622][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 30.722878][ T12] CR2: 00007f4b178e5a20 CR3: 000000000b08d003 CR4: 0000000000772ef0
[ 30.723164][ T12] PKRU: 55555554
[ 30.723325][ T12] Call Trace:
[ 30.723476][ T12]
[ 30.723587][ T12] netdev_run_todo+0x5f0/0xc60
[ 30.723783][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 30.723983][ T12] ? generic_xdp_install+0x410/0x410
[ 30.724188][ T12] ops_undo_list+0x714/0x890
[ 30.724397][ T12] ? netns_get+0x110/0x110
[ 30.724589][ T12] ? cleanup_net+0x2d6/0x830
[ 30.724784][ T12] cleanup_net+0x3b2/0x830
[ 30.725003][ T12] ? net_passive_dec+0x190/0x190
[ 30.725207][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.725408][ T12] process_one_work+0xe35/0x1650
[ 30.725605][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 30.725804][ T12] ? assign_work+0x168/0x240
[ 30.726004][ T12] worker_thread+0x591/0xcf0
[ 30.726215][ T12] ? rescuer_thread+0xd10/0xd10
[ 30.726422][ T12] kthread+0x37b/0x5f0
[ 30.726574][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.726761][ T12] ? ret_from_fork+0x1b/0x270
[ 30.726964][ T12] ? __lock_release+0x5d/0x170
[ 30.727165][ T12] ? rcu_is_watching+0x12/0xb0
[ 30.727378][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.727575][ T12] ret_from_fork+0x1db/0x270
[ 30.727769][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 30.727969][ T12] ret_from_fork_asm+0x11/0x20
[ 30.728175][ T12]
[ 30.728335][ T12] irq event stamp: 2713
[ 30.728509][ T12] hardirqs last enabled at (2713): [] finish_task_switch.isra.0+0x245/0x960
[ 30.728882][ T12] hardirqs last disabled at (2712): [] __schedule+0x94a/0x1b10
[ 30.729214][ T12] softirqs last enabled at (2144): [] handle_softirqs+0x352/0x610
[ 30.729562][ T12] softirqs last disabled at (2137): [] irq_exit_rcu+0xab/0x100
[ 30.729895][ T12] ---[ end trace 0000000000000000 ]---