[ 14.713971][ T12] ==================================================================
[ 14.714499][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 14.714945][ T12] Read of size 1 at addr ffff888009594694 by task kworker/u16:0/12
[ 14.715352][ T12]
[ 14.715497][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.715506][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.715510][ T12] Workqueue: netns cleanup_net
[ 14.715526][ T12] Call Trace:
[ 14.715532][ T12]
[ 14.715536][ T12] dump_stack_lvl+0x82/0xc0
[ 14.715553][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 14.715585][ T12] ? kobject_put+0xbb/0xd0
[ 14.715591][ T12] print_report+0xb4/0x270
[ 14.715597][ T12] ? kobject_put+0xbb/0xd0
[ 14.715602][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 14.715608][ T12] ? kobject_put+0xbb/0xd0
[ 14.715612][ T12] kasan_report+0xca/0x100
[ 14.715620][ T12] ? kobject_put+0xbb/0xd0
[ 14.715629][ T12] kobject_put+0xbb/0xd0
[ 14.715635][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.715646][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.715653][ T12] ? generic_xdp_install+0x410/0x410
[ 14.715666][ T12] ops_undo_list+0x714/0x890
[ 14.715674][ T12] ? netns_get+0x110/0x110
[ 14.715678][ T12] ? cleanup_net+0x2d6/0x830
[ 14.715690][ T12] cleanup_net+0x3b2/0x830
[ 14.715697][ T12] ? net_passive_dec+0x190/0x190
[ 14.715704][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.715722][ T12] process_one_work+0xe35/0x1650
[ 14.715746][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.715762][ T12] ? assign_work+0x168/0x240
[ 14.715770][ T12] worker_thread+0x591/0xcf0
[ 14.715780][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.715787][ T12] kthread+0x37b/0x5f0
[ 14.715793][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.715796][ T12] ? ret_from_fork+0x1b/0x270
[ 14.715815][ T12] ? __lock_release+0x5d/0x170
[ 14.715826][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.715831][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.715837][ T12] ret_from_fork+0x1db/0x270
[ 14.715843][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.715847][ T12] ret_from_fork_asm+0x11/0x20
[ 14.715869][ T12]
[ 14.715871][ T12]
[ 14.726012][ T12] Allocated by task 227:
[ 14.726226][ T12] kasan_save_stack+0x24/0x40
[ 14.726498][ T12] kasan_save_track+0x14/0x30
[ 14.726774][ T12] __kasan_kmalloc+0x7b/0x90
[ 14.727055][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 14.727322][ T12] alloc_netdev_mqs+0x7d/0x1310
[ 14.727594][ T12] sit_init_net+0x169/0x550
[ 14.727875][ T12] ops_init+0x189/0x550
[ 14.728076][ T12] setup_net+0xf1/0x380
[ 14.728286][ T12] copy_net_ns+0x21a/0x380
[ 14.728554][ T12] create_new_namespaces+0x35f/0x900
[ 14.728821][ T12] unshare_nsproxy_namespaces+0x89/0x120
[ 14.729090][ T12] ksys_unshare+0x2a3/0x660
[ 14.729364][ T12] __x64_sys_unshare+0x31/0x40
[ 14.729636][ T12] do_syscall_64+0xc1/0xfd0
[ 14.729906][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 14.730237][ T12]
[ 14.730374][ T12] Freed by task 12:
[ 14.730586][ T12] kasan_save_stack+0x24/0x40
[ 14.730852][ T12] kasan_save_track+0x14/0x30
[ 14.731128][ T12] __kasan_save_free_info+0x3b/0x60
[ 14.731395][ T12] __kasan_slab_free+0x3f/0x60
[ 14.731662][ T12] kfree+0x21d/0x540
[ 14.731863][ T12] device_release+0x9c/0x210
[ 14.732151][ T12] kobject_cleanup+0xfe/0x360
[ 14.732415][ T12] netdev_run_todo+0x81f/0xc60
[ 14.732681][ T12] ops_undo_list+0x714/0x890
[ 14.732952][ T12] cleanup_net+0x3b2/0x830
[ 14.733211][ T12] process_one_work+0xe35/0x1650
[ 14.733473][ T12] worker_thread+0x591/0xcf0
[ 14.733736][ T12] kthread+0x37b/0x5f0
[ 14.733945][ T12] ret_from_fork+0x1db/0x270
[ 14.734196][ T12] ret_from_fork_asm+0x11/0x20
[ 14.734449][ T12]
[ 14.734579][ T12] The buggy address belongs to the object at ffff888009594000
[ 14.734579][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 14.735196][ T12] The buggy address is located 1684 bytes inside of
[ 14.735196][ T12] freed 4096-byte region [ffff888009594000, ffff888009595000)
[ 14.735799][ T12]
[ 14.735936][ T12] The buggy address belongs to the physical page:
[ 14.736238][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9590
[ 14.736694][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 14.737097][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 14.737423][ T12] page_type: f5(slab)
[ 14.737619][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000255c10 ffffea0000216c10
[ 14.738086][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.738540][ T12] head: 0080000000000040 ffff888001043700 ffffea0000255c10 ffffea0000216c10
[ 14.739004][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 14.739459][ T12] head: 0080000000000003 ffffea0000256401 00000000ffffffff 00000000ffffffff
[ 14.739918][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 14.740375][ T12] page dumped because: kasan: bad access detected
[ 14.740696][ T12]
[ 14.740833][ T12] Memory state around the buggy address:
[ 14.741085][ T12] ffff888009594580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.741459][ T12] ffff888009594600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.741827][ T12] >ffff888009594680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.742199][ T12] ^
[ 14.742453][ T12] ffff888009594700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.742827][ T12] ffff888009594780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 14.743201][ T12] ==================================================================
[ 14.743773][ T12] Disabling lock debugging due to kernel taint
[ 14.744248][ T12] ------------[ cut here ]------------
[ 14.744476][ T12] refcount_t: underflow; use-after-free.
[ 14.744799][ T12] WARNING: CPU: 1 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 14.745495][ T12] Modules linked in: veth
[ 14.745729][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 14.746309][ T12] Tainted: [B]=BAD_PAGE
[ 14.746513][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 14.746863][ T12] Workqueue: netns cleanup_net
[ 14.747147][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 14.747484][ 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 05 b6 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
[ 14.748638][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[ 14.748981][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 14.749557][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 14.749960][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6d3e134
[ 14.750568][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 14.750972][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 14.751396][ T12] FS: 0000000000000000(0000) GS:ffff88807e490000(0000) knlGS:0000000000000000
[ 14.752045][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.752398][ T12] CR2: 000055dce9e6fc90 CR3: 000000000a946004 CR4: 0000000000772ef0
[ 14.752809][ T12] PKRU: 55555554
[ 14.753182][ T12] Call Trace:
[ 14.753386][ T12]
[ 14.753528][ T12] netdev_run_todo+0x5f0/0xc60
[ 14.753814][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 14.754099][ T12] ? generic_xdp_install+0x410/0x410
[ 14.754387][ T12] ops_undo_list+0x714/0x890
[ 14.754670][ T12] ? netns_get+0x110/0x110
[ 14.755054][ T12] ? cleanup_net+0x2d6/0x830
[ 14.755528][ T12] cleanup_net+0x3b2/0x830
[ 14.755806][ T12] ? net_passive_dec+0x190/0x190
[ 14.756067][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.756365][ T12] process_one_work+0xe35/0x1650
[ 14.756645][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 14.757082][ T12] ? assign_work+0x168/0x240
[ 14.757366][ T12] worker_thread+0x591/0xcf0
[ 14.757639][ T12] ? rescuer_thread+0xd10/0xd10
[ 14.757909][ T12] kthread+0x37b/0x5f0
[ 14.758294][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.758561][ T12] ? ret_from_fork+0x1b/0x270
[ 14.758837][ T12] ? __lock_release+0x5d/0x170
[ 14.759119][ T12] ? rcu_is_watching+0x12/0xb0
[ 14.759548][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.759816][ T12] ret_from_fork+0x1db/0x270
[ 14.760083][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 14.760365][ T12] ret_from_fork_asm+0x11/0x20
[ 14.760823][ T12]
[ 14.761038][ T12] irq event stamp: 2827
[ 14.761254][ T12] hardirqs last enabled at (2827): [] finish_task_switch.isra.0+0x245/0x960
[ 14.761944][ T12] hardirqs last disabled at (2826): [] __schedule+0x94a/0x1b10
[ 14.762410][ T12] softirqs last enabled at (1934): [] unregister_netdevice_many_notify+0x711/0x1b30
[ 14.762928][ T12] softirqs last disabled at (1932): [] dev_mc_flush+0x54/0x90
[ 14.763580][ T12] ---[ end trace 0000000000000000 ]---