[ 17.247108][ T12] ==================================================================
[ 17.247596][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 17.248035][ T12] Read of size 1 at addr ffff8880085596c4 by task kworker/u16:0/12
[ 17.248449][ T12]
[ 17.248592][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.248600][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.248604][ T12] Workqueue: netns cleanup_net
[ 17.248614][ T12] Call Trace:
[ 17.248617][ T12]
[ 17.248621][ T12] dump_stack_lvl+0x82/0xc0
[ 17.248629][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 17.248639][ T12] ? kobject_put+0xbb/0xd0
[ 17.248645][ T12] print_report+0xb4/0x270
[ 17.248651][ T12] ? kobject_put+0xbb/0xd0
[ 17.248655][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 17.248662][ T12] ? kobject_put+0xbb/0xd0
[ 17.248666][ T12] kasan_report+0xca/0x100
[ 17.248674][ T12] ? kobject_put+0xbb/0xd0
[ 17.248683][ T12] kobject_put+0xbb/0xd0
[ 17.248689][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.248697][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.248703][ T12] ? generic_xdp_install+0x410/0x410
[ 17.248707][ T12] ? net_generic+0xb1/0x1f0
[ 17.248721][ T12] ops_undo_list+0x714/0x890
[ 17.248730][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 17.248735][ T12] ? cleanup_net+0x2d6/0x8b0
[ 17.248746][ T12] cleanup_net+0x3b2/0x8b0
[ 17.248753][ T12] ? net_passive_dec+0x190/0x190
[ 17.248761][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.248772][ T12] process_one_work+0xe35/0x1650
[ 17.248785][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.248796][ T12] ? assign_work+0x168/0x240
[ 17.248804][ T12] worker_thread+0x591/0xcf0
[ 17.248814][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.248821][ T12] kthread+0x37b/0x5f0
[ 17.248827][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.248832][ T12] ? ret_from_fork+0x1b/0x270
[ 17.248838][ T12] ? __lock_release+0x5d/0x170
[ 17.248845][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.248851][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.248857][ T12] ret_from_fork+0x1db/0x270
[ 17.248861][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.248867][ T12] ret_from_fork_asm+0x11/0x20
[ 17.248882][ T12]
[ 17.248884][ T12]
[ 17.256943][ T12] Allocated by task 258:
[ 17.257248][ T12] kasan_save_stack+0x24/0x40
[ 17.257470][ T12] kasan_save_track+0x14/0x30
[ 17.257670][ T12] __kasan_kmalloc+0x7b/0x90
[ 17.257865][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 17.258138][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 17.258335][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 17.258524][ T12] ops_init+0x189/0x550
[ 17.258666][ T12] setup_net+0xf1/0x380
[ 17.258841][ T12] copy_net_ns+0x253/0x510
[ 17.259078][ T12] create_new_namespaces+0x35f/0x900
[ 17.259272][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 17.259520][ T12] ksys_unshare+0x2be/0x6e0
[ 17.259821][ T12] __x64_sys_unshare+0x31/0x40
[ 17.260027][ T12] do_syscall_64+0xc1/0xfd0
[ 17.260286][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.260518][ T12]
[ 17.260615][ T12] Freed by task 12:
[ 17.260803][ T12] kasan_save_stack+0x24/0x40
[ 17.261019][ T12] kasan_save_track+0x14/0x30
[ 17.261205][ T12] __kasan_save_free_info+0x3b/0x60
[ 17.261431][ T12] __kasan_slab_free+0x3f/0x60
[ 17.261653][ T12] kfree+0x21d/0x540
[ 17.261789][ T12] device_release+0x9c/0x210
[ 17.261977][ T12] kobject_cleanup+0xfe/0x360
[ 17.262218][ T12] netdev_run_todo+0x81f/0xc60
[ 17.262519][ T12] ops_undo_list+0x714/0x890
[ 17.262710][ T12] cleanup_net+0x3b2/0x8b0
[ 17.262923][ T12] process_one_work+0xe35/0x1650
[ 17.263177][ T12] worker_thread+0x591/0xcf0
[ 17.263373][ T12] kthread+0x37b/0x5f0
[ 17.263512][ T12] ret_from_fork+0x1db/0x270
[ 17.263734][ T12] ret_from_fork_asm+0x11/0x20
[ 17.264015][ T12]
[ 17.264153][ T12] The buggy address belongs to the object at ffff888008559000
[ 17.264153][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 17.264604][ T12] The buggy address is located 1732 bytes inside of
[ 17.264604][ T12] freed 4096-byte region [ffff888008559000, ffff88800855a000)
[ 17.265145][ T12]
[ 17.265244][ T12] The buggy address belongs to the physical page:
[ 17.265535][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8558
[ 17.265878][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 17.266214][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 17.266465][ T12] page_type: f5(slab)
[ 17.266615][ T12] raw: 0080000000000040 ffff888001043700 ffffea000020cc10 ffffea000020e210
[ 17.267131][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.267597][ T12] head: 0080000000000040 ffff888001043700 ffffea000020cc10 ffffea000020e210
[ 17.268042][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 17.268455][ T12] head: 0080000000000003 ffffea0000215601 00000000ffffffff 00000000ffffffff
[ 17.268973][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 17.269509][ T12] page dumped because: kasan: bad access detected
[ 17.269721][ T12]
[ 17.269820][ T12] Memory state around the buggy address:
[ 17.270054][ T12] ffff888008559580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.270360][ T12] ffff888008559600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.270675][ T12] >ffff888008559680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.271037][ T12] ^
[ 17.271319][ T12] ffff888008559700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.271785][ T12] ffff888008559780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 17.272040][ T12] ==================================================================
[ 17.272484][ T12] Disabling lock debugging due to kernel taint
[ 17.272793][ T12] ------------[ cut here ]------------
[ 17.272995][ T12] refcount_t: underflow; use-after-free.
[ 17.273229][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.273538][ T12] Modules linked in:
[ 17.273684][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.274067][ T12] Tainted: [B]=BAD_PAGE
[ 17.274246][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.274489][ T12] Workqueue: netns cleanup_net
[ 17.274673][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.274963][ 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 45 ba 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
[ 17.275606][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 17.275958][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.276246][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.276627][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7680934
[ 17.276885][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 17.277144][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.277397][ T12] FS: 0000000000000000(0000) GS:ffff8880aa408000(0000) knlGS:0000000000000000
[ 17.277928][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.278174][ T12] CR2: 00007f6bfa620bd0 CR3: 000000000e2c6003 CR4: 0000000000772ef0
[ 17.278477][ T12] PKRU: 55555554
[ 17.278624][ T12] Call Trace:
[ 17.278765][ T12]
[ 17.278886][ T12] netdev_run_todo+0x5f0/0xc60
[ 17.279180][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 17.279364][ T12] ? generic_xdp_install+0x410/0x410
[ 17.279562][ T12] ? net_generic+0xb1/0x1f0
[ 17.279746][ T12] ops_undo_list+0x714/0x890
[ 17.279933][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 17.280200][ T12] ? cleanup_net+0x2d6/0x8b0
[ 17.280392][ T12] cleanup_net+0x3b2/0x8b0
[ 17.280573][ T12] ? net_passive_dec+0x190/0x190
[ 17.280749][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.280930][ T12] process_one_work+0xe35/0x1650
[ 17.281107][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 17.281291][ T12] ? assign_work+0x168/0x240
[ 17.281469][ T12] worker_thread+0x591/0xcf0
[ 17.281644][ T12] ? rescuer_thread+0xd10/0xd10
[ 17.281819][ T12] kthread+0x37b/0x5f0
[ 17.281970][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.282172][ T12] ? ret_from_fork+0x1b/0x270
[ 17.282403][ T12] ? __lock_release+0x5d/0x170
[ 17.282594][ T12] ? rcu_is_watching+0x12/0xb0
[ 17.282816][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.283041][ T12] ret_from_fork+0x1db/0x270
[ 17.283215][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 17.283388][ T12] ret_from_fork_asm+0x11/0x20
[ 17.283591][ T12]
[ 17.283749][ T12] irq event stamp: 8561
[ 17.283969][ T12] hardirqs last enabled at (8561): [] finish_task_switch.isra.0+0x245/0x960
[ 17.284372][ T12] hardirqs last disabled at (8560): [] __schedule+0x94a/0x1b10
[ 17.284736][ T12] softirqs last enabled at (7930): [] handle_softirqs+0x352/0x610
[ 17.285089][ T12] softirqs last disabled at (7921): [] irq_exit_rcu+0xab/0x100
[ 17.285402][ T12] ---[ end trace 0000000000000000 ]---