[ 17.239151][ T12] ==================================================================
[ 17.239579][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 17.239919][ T12] Read of size 1 at addr ffff888005c51694 by task kworker/u16:0/12
[ 17.240231][ T12]
[ 17.240334][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.240340][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.240344][ T12] Workqueue: netns cleanup_net
[ 17.240353][ T12] Call Trace:
[ 17.240356][ T12]
[ 17.240360][ T12] dump_stack_lvl+0x82/0xc0
[ 17.240367][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 17.240377][ T12] ? kobject_put+0xbb/0xd0
[ 17.240381][ T12] print_report+0xb4/0x270
[ 17.240385][ T12] ? kobject_put+0xbb/0xd0
[ 17.240387][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 17.240391][ T12] ? kobject_put+0xbb/0xd0
[ 17.240394][ T12] kasan_report+0xca/0x100
[ 17.240399][ T12] ? kobject_put+0xbb/0xd0
[ 17.240404][ T12] kobject_put+0xbb/0xd0
[ 17.240407][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.240414][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.240418][ T12] ? generic_xdp_install+0x410/0x410
[ 17.240425][ T12] ops_undo_list+0x714/0x890
[ 17.240429][ T12] ? netns_get+0x110/0x110
[ 17.240432][ T12] ? cleanup_net+0x2d6/0x830
[ 17.240440][ T12] cleanup_net+0x3b2/0x830
[ 17.240445][ T12] ? net_passive_dec+0x190/0x190
[ 17.240450][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.240459][ T12] process_one_work+0xe35/0x1650
[ 17.240468][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.240474][ T12] ? assign_work+0x168/0x240
[ 17.240477][ T12] worker_thread+0x591/0xcf0
[ 17.240483][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.240486][ T12] kthread+0x37b/0x5f0
[ 17.240490][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.240493][ T12] ? ret_from_fork+0x1b/0x270
[ 17.240499][ T12] ? __lock_release+0x5d/0x170
[ 17.240506][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.240509][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.240512][ T12] ret_from_fork+0x1db/0x270
[ 17.240515][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.240518][ T12] ret_from_fork_asm+0x11/0x20
[ 17.240531][ T12]
[ 17.240533][ T12]
[ 17.248355][ T12] Allocated by task 227:
[ 17.248506][ T12] kasan_save_stack+0x24/0x40
[ 17.248757][ T12] kasan_save_track+0x14/0x30
[ 17.248931][ T12] __kasan_kmalloc+0x7b/0x90
[ 17.249273][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 17.249495][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 17.249699][ T12] sit_init_net+0x169/0x550
[ 17.249880][ T12] ops_init+0x189/0x550
[ 17.250029][ T12] setup_net+0xf1/0x380
[ 17.250289][ T12] copy_net_ns+0x21a/0x380
[ 17.250501][ T12] create_new_namespaces+0x35f/0x900
[ 17.250705][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 17.250920][ T12] ksys_unshare+0x2a3/0x660
[ 17.251219][ T12] __x64_sys_unshare+0x31/0x40
[ 17.251409][ T12] do_syscall_64+0xc1/0xfd0
[ 17.251631][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.251846][ T12]
[ 17.252051][ T12] Freed by task 12:
[ 17.252197][ T12] kasan_save_stack+0x24/0x40
[ 17.252403][ T12] kasan_save_track+0x14/0x30
[ 17.252610][ T12] __kasan_save_free_info+0x3b/0x60
[ 17.252786][ T12] __kasan_slab_free+0x3f/0x60
[ 17.252968][ T12] kfree+0x21d/0x540
[ 17.253108][ T12] device_release+0x9c/0x210
[ 17.253305][ T12] kobject_cleanup+0xfe/0x360
[ 17.253495][ T12] netdev_run_todo+0x81f/0xc60
[ 17.253793][ T12] ops_undo_list+0x714/0x890
[ 17.253966][ T12] cleanup_net+0x3b2/0x830
[ 17.254178][ T12] process_one_work+0xe35/0x1650
[ 17.254382][ T12] worker_thread+0x591/0xcf0
[ 17.254709][ T12] kthread+0x37b/0x5f0
[ 17.254865][ T12] ret_from_fork+0x1db/0x270
[ 17.255065][ T12] ret_from_fork_asm+0x11/0x20
[ 17.255245][ T12]
[ 17.255460][ T12] The buggy address belongs to the object at ffff888005c51000
[ 17.255460][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 17.255919][ T12] The buggy address is located 1684 bytes inside of
[ 17.255919][ T12] freed 4096-byte region [ffff888005c51000, ffff888005c52000)
[ 17.256514][ T12]
[ 17.256634][ T12] The buggy address belongs to the physical page:
[ 17.256856][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c50
[ 17.257201][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 17.257494][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 17.257759][ T12] page_type: f5(slab)
[ 17.258024][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001fd210 ffffea000021d010
[ 17.258372][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.258727][ T12] head: 0080000000000040 ffff888001043700 ffffea00001fd210 ffffea000021d010
[ 17.259169][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.259508][ T12] head: 0080000000000003 ffffea0000171401 00000000ffffffff 00000000ffffffff
[ 17.259860][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 17.260201][ T12] page dumped because: kasan: bad access detected
[ 17.260453][ T12]
[ 17.260662][ T12] Memory state around the buggy address:
[ 17.260840][ T12] ffff888005c51580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.261131][ T12] ffff888005c51600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.261507][ T12] >ffff888005c51680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.261794][ T12] ^
[ 17.261974][ T12] ffff888005c51700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.262345][ T12] ffff888005c51780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.262643][ T12] ==================================================================
[ 17.263692][ T12] Disabling lock debugging due to kernel taint
[ 17.264036][ T12] ------------[ cut here ]------------
[ 17.264248][ T12] refcount_t: underflow; use-after-free.
[ 17.264508][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.265566][ T12] Modules linked in: veth
[ 17.265799][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.266272][ T12] Tainted: [B]=BAD_PAGE
[ 17.266466][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.266749][ T12] Workqueue: netns cleanup_net
[ 17.266985][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.267266][ T12] Code: 48 92 02 80 fb 01 0f 87 cb 7d d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 75 48 92 02 01 90 48 c7 c7 a0 8d e5 bb e8 42 93 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 37 a1 ff e9 ba fe ff ff
[ 17.268022][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 17.268292][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.268635][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.268952][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff78fe134
[ 17.269276][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 17.269601][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.270026][ T12] FS: 0000000000000000(0000) GS:ffff888078710000(0000) knlGS:0000000000000000
[ 17.270422][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.270704][ T12] CR2: 00007ff39a9b6760 CR3: 0000000005c07001 CR4: 0000000000772ef0
[ 17.271055][ T12] PKRU: 55555554
[ 17.271228][ T12] Call Trace:
[ 17.271403][ T12]
[ 17.271546][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.271779][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.271990][ T12] ? generic_xdp_install+0x410/0x410
[ 17.272214][ T12] ops_undo_list+0x714/0x890
[ 17.272549][ T12] ? netns_get+0x110/0x110
[ 17.272769][ T12] ? cleanup_net+0x2d6/0x830
[ 17.273087][ T12] cleanup_net+0x3b2/0x830
[ 17.273301][ T12] ? net_passive_dec+0x190/0x190
[ 17.273646][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.273870][ T12] process_one_work+0xe35/0x1650
[ 17.274095][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.274310][ T12] ? assign_work+0x168/0x240
[ 17.274636][ T12] worker_thread+0x591/0xcf0
[ 17.274852][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.275171][ T12] kthread+0x37b/0x5f0
[ 17.275343][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.275678][ T12] ? ret_from_fork+0x1b/0x270
[ 17.275892][ T12] ? __lock_release+0x5d/0x170
[ 17.276103][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.276334][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.276653][ T12] ret_from_fork+0x1db/0x270
[ 17.276866][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.277088][ T12] ret_from_fork_asm+0x11/0x20
[ 17.277304][ T12]
[ 17.277592][ T12] irq event stamp: 2793
[ 17.277776][ T12] hardirqs last enabled at (2793): [] finish_task_switch.isra.0+0x245/0x960
[ 17.278177][ T12] hardirqs last disabled at (2792): [] __schedule+0x94a/0x1b10
[ 17.278547][ T12] softirqs last enabled at (2672): [] handle_softirqs+0x352/0x610
[ 17.278933][ T12] softirqs last disabled at (2663): [] irq_exit_rcu+0xab/0x100
[ 17.279330][ T12] ---[ end trace 0000000000000000 ]---