[ 13.256216][ T12] ==================================================================
[ 13.256584][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 13.256827][ T12] Read of size 1 at addr ffff888009e09694 by task kworker/u16:0/12
[ 13.257083][ T12]
[ 13.257170][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 13.257175][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.257178][ T12] Workqueue: netns cleanup_net
[ 13.257186][ T12] Call Trace:
[ 13.257188][ T12]
[ 13.257191][ T12] dump_stack_lvl+0x82/0xc0
[ 13.257197][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 13.257206][ T12] ? kobject_put+0xbb/0xd0
[ 13.257210][ T12] print_report+0xb4/0x270
[ 13.257213][ T12] ? kobject_put+0xbb/0xd0
[ 13.257216][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 13.257220][ T12] ? kobject_put+0xbb/0xd0
[ 13.257223][ T12] kasan_report+0xca/0x100
[ 13.257227][ T12] ? kobject_put+0xbb/0xd0
[ 13.257232][ T12] kobject_put+0xbb/0xd0
[ 13.257235][ T12] netdev_run_todo+0x5f0/0xc60
[ 13.257242][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 13.257246][ T12] ? generic_xdp_install+0x410/0x410
[ 13.257252][ T12] ops_undo_list+0x714/0x890
[ 13.257256][ T12] ? netns_get+0x110/0x110
[ 13.257258][ T12] ? cleanup_net+0x2d6/0x830
[ 13.257263][ T12] cleanup_net+0x3b2/0x830
[ 13.257266][ T12] ? net_passive_dec+0x190/0x190
[ 13.257270][ T12] ? rcu_is_watching+0x12/0xb0
[ 13.257277][ T12] process_one_work+0xe35/0x1650
[ 13.257285][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 13.257290][ T12] ? assign_work+0x168/0x240
[ 13.257294][ T12] worker_thread+0x591/0xcf0
[ 13.257299][ T12] ? rescuer_thread+0xd10/0xd10
[ 13.257302][ T12] kthread+0x37b/0x5f0
[ 13.257306][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.257308][ T12] ? ret_from_fork+0x1b/0x270
[ 13.257314][ T12] ? __lock_release+0x5d/0x170
[ 13.257320][ T12] ? rcu_is_watching+0x12/0xb0
[ 13.257322][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.257325][ T12] ret_from_fork+0x1db/0x270
[ 13.257328][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.257331][ T12] ret_from_fork_asm+0x11/0x20
[ 13.257340][ T12]
[ 13.257341][ T12]
[ 13.263334][ T12] Allocated by task 228:
[ 13.263453][ T12] kasan_save_stack+0x24/0x40
[ 13.263619][ T12] kasan_save_track+0x14/0x30
[ 13.263800][ T12] __kasan_kmalloc+0x7b/0x90
[ 13.263955][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 13.264114][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 13.264279][ T12] sit_init_net+0x169/0x550
[ 13.264449][ T12] ops_init+0x189/0x550
[ 13.264566][ T12] setup_net+0xf1/0x380
[ 13.264681][ T12] copy_net_ns+0x21a/0x380
[ 13.264835][ T12] create_new_namespaces+0x35f/0x900
[ 13.264991][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 13.265172][ T12] ksys_unshare+0x2a3/0x660
[ 13.265331][ T12] __x64_sys_unshare+0x31/0x40
[ 13.265484][ T12] do_syscall_64+0xc1/0xfd0
[ 13.265642][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 13.265850][ T12]
[ 13.265928][ T12] Freed by task 12:
[ 13.266043][ T12] kasan_save_stack+0x24/0x40
[ 13.266204][ T12] kasan_save_track+0x14/0x30
[ 13.266358][ T12] __kasan_save_free_info+0x3b/0x60
[ 13.266517][ T12] __kasan_slab_free+0x3f/0x60
[ 13.266667][ T12] kfree+0x21d/0x540
[ 13.266787][ T12] device_release+0x9c/0x210
[ 13.266969][ T12] kobject_cleanup+0xfe/0x360
[ 13.267122][ T12] netdev_run_todo+0x81f/0xc60
[ 13.267275][ T12] ops_undo_list+0x714/0x890
[ 13.267450][ T12] cleanup_net+0x3b2/0x830
[ 13.267603][ T12] process_one_work+0xe35/0x1650
[ 13.267755][ T12] worker_thread+0x591/0xcf0
[ 13.267924][ T12] kthread+0x37b/0x5f0
[ 13.268044][ T12] ret_from_fork+0x1db/0x270
[ 13.268198][ T12] ret_from_fork_asm+0x11/0x20
[ 13.268358][ T12]
[ 13.268438][ T12] The buggy address belongs to the object at ffff888009e09000
[ 13.268438][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 13.268813][ T12] The buggy address is located 1684 bytes inside of
[ 13.268813][ T12] freed 4096-byte region [ffff888009e09000, ffff888009e0a000)
[ 13.269194][ T12]
[ 13.269272][ T12] The buggy address belongs to the physical page:
[ 13.269458][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9e08
[ 13.269735][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 13.269998][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 13.270196][ T12] page_type: f5(slab)
[ 13.270318][ T12] raw: 0080000000000040 ffff888001043700 ffffea00001ff410 ffffea000024a010
[ 13.270622][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 13.270897][ T12] head: 0080000000000040 ffff888001043700 ffffea00001ff410 ffffea000024a010
[ 13.271202][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 13.271482][ T12] head: 0080000000000003 ffffea0000278201 00000000ffffffff 00000000ffffffff
[ 13.271755][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 13.272050][ T12] page dumped because: kasan: bad access detected
[ 13.272245][ T12]
[ 13.272326][ T12] Memory state around the buggy address:
[ 13.272475][ T12] ffff888009e09580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.272725][ T12] ffff888009e09600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.272945][ T12] >ffff888009e09680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.273164][ T12] ^
[ 13.273317][ T12] ffff888009e09700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.273536][ T12] ffff888009e09780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 13.273755][ T12] ==================================================================
[ 13.274011][ T12] Disabling lock debugging due to kernel taint
[ 13.274204][ T12] ------------[ cut here ]------------
[ 13.274352][ T12] refcount_t: underflow; use-after-free.
[ 13.274531][ T12] WARNING: CPU: 3 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 13.274805][ T12] Modules linked in: veth
[ 13.274929][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 13.275283][ T12] Tainted: [B]=BAD_PAGE
[ 13.275404][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.275602][ T12] Workqueue: netns cleanup_net
[ 13.275772][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 13.275966][ 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 25 a4 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
[ 13.276525][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 13.276715][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 13.276949][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 13.277184][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff497e134
[ 13.277408][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 13.277636][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 13.277862][ T12] FS: 0000000000000000(0000) GS:ffff888090390000(0000) knlGS:0000000000000000
[ 13.278124][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 13.278316][ T12] CR2: 00007f9d403d1b40 CR3: 0000000005922005 CR4: 0000000000772ef0
[ 13.278543][ T12] PKRU: 55555554
[ 13.278656][ T12] Call Trace:
[ 13.278771][ T12]
[ 13.278858][ T12] netdev_run_todo+0x5f0/0xc60
[ 13.279014][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 13.279174][ T12] ? generic_xdp_install+0x410/0x410
[ 13.279331][ T12] ops_undo_list+0x714/0x890
[ 13.279482][ T12] ? netns_get+0x110/0x110
[ 13.279639][ T12] ? cleanup_net+0x2d6/0x830
[ 13.279797][ T12] cleanup_net+0x3b2/0x830
[ 13.279948][ T12] ? net_passive_dec+0x190/0x190
[ 13.280096][ T12] ? rcu_is_watching+0x12/0xb0
[ 13.280257][ T12] process_one_work+0xe35/0x1650
[ 13.280410][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 13.280565][ T12] ? assign_work+0x168/0x240
[ 13.280714][ T12] worker_thread+0x591/0xcf0
[ 13.280872][ T12] ? rescuer_thread+0xd10/0xd10
[ 13.281023][ T12] kthread+0x37b/0x5f0
[ 13.281144][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.281296][ T12] ? ret_from_fork+0x1b/0x270
[ 13.281464][ T12] ? __lock_release+0x5d/0x170
[ 13.281617][ T12] ? rcu_is_watching+0x12/0xb0
[ 13.281765][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.281916][ T12] ret_from_fork+0x1db/0x270
[ 13.282073][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 13.282231][ T12] ret_from_fork_asm+0x11/0x20
[ 13.282385][ T12]
[ 13.282500][ T12] irq event stamp: 2663
[ 13.282614][ T12] hardirqs last enabled at (2663): [] irqentry_exit+0x3b/0x80
[ 13.282878][ T12] hardirqs last disabled at (2662): [] handle_softirqs+0x47f/0x610
[ 13.283166][ T12] softirqs last enabled at (1810): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 13.283472][ T12] softirqs last disabled at (1808): [] dev_mc_flush+0x54/0x90
[ 13.283729][ T12] ---[ end trace 0000000000000000 ]---