usb 4-1: USB disconnect, device number 3
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3142 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xbe/0x470 mm/slub.c:4123

CPU: 1 PID: 3176 Comm: kworker/1:4 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xf6/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:383
 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:477
 __kasan_slab_free+0x122/0x130 mm/kasan/common.c:401
 slab_free_hook mm/slub.c:1548 [inline]
 slab_free_freelist_hook+0x53/0x140 mm/slub.c:1581
 slab_free mm/slub.c:3142 [inline]
 kfree+0xbe/0x470 mm/slub.c:4123
 platform_device_release+0x64/0xf0 drivers/base/platform.c:426
 device_release+0x71/0x200 drivers/base/core.c:1800
 kobject_cleanup lib/kobject.c:704 [inline]
 kobject_release lib/kobject.c:735 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c8/0x540 lib/kobject.c:752
 put_device drivers/base/core.c:3029 [inline]
 klist_children_put+0x41/0x50 drivers/base/core.c:2382
 klist_prev+0x2a2/0x510 lib/klist.c:362
 prev_device drivers/base/core.c:3146 [inline]
 device_for_each_child_reverse+0xc0/0x180 drivers/base/core.c:3268
 mfd_remove_devices+0x75/0xa0 drivers/mfd/mfd-core.c:391
 vprbrd_disconnect+0x43/0xf0 drivers/mfd/viperboard.c:111
 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436
 __device_release_driver+0x3c6/0x6f0 drivers/base/dd.c:1153
 device_release_driver_internal drivers/base/dd.c:1184 [inline]
 device_release_driver+0x26/0x40 drivers/base/dd.c:1207
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
 device_del+0x481/0xd90 drivers/base/core.c:3107
 usb_disable_device+0x387/0x930 drivers/usb/core/message.c:1245
 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2217
 hub_port_connect drivers/usb/core/hub.c:5059 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 3176:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc_node mm/slub.c:2892 [inline]
 slab_alloc mm/slub.c:2900 [inline]
 __kmalloc_track_caller+0xf6/0x270 mm/slub.c:4463
 kmemdup+0x23/0x50 mm/util.c:127
 kmemdup include/linux/string.h:479 [inline]
 mfd_add_device+0x112/0x1190 drivers/mfd/mfd-core.c:191
 mfd_add_devices+0xdb/0x170 drivers/mfd/mfd-core.c:339
 mfd_add_hotplug_devices include/linux/mfd/core.h:152 [inline]
 vprbrd_probe.cold+0x107/0x181 drivers/mfd/viperboard.c:89
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374
 really_probe+0x291/0xde0 drivers/base/dd.c:553
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:912
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb51/0x1c70 drivers/base/core.c:2930
 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:239
 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272
 really_probe+0x291/0xde0 drivers/base/dd.c:553
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:912
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb51/0x1c70 drivers/base/core.c:2930
 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5208 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x2361/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2417
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 3176:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xf3/0x130 mm/kasan/common.c:422
 slab_free_hook mm/slub.c:1548 [inline]
 slab_free_freelist_hook+0x53/0x140 mm/slub.c:1581
 slab_free mm/slub.c:3142 [inline]
 kfree+0xbe/0x470 mm/slub.c:4123
 mfd_remove_devices_fn drivers/mfd/mfd-core.c:373 [inline]
 mfd_remove_devices_fn+0xf9/0x140 drivers/mfd/mfd-core.c:355
 device_for_each_child_reverse+0x110/0x180 drivers/base/core.c:3269
 mfd_remove_devices+0x75/0xa0 drivers/mfd/mfd-core.c:391
 vprbrd_disconnect+0x43/0xf0 drivers/mfd/viperboard.c:111
 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436
 __device_release_driver+0x3c6/0x6f0 drivers/base/dd.c:1153
 device_release_driver_internal drivers/base/dd.c:1184 [inline]
 device_release_driver+0x26/0x40 drivers/base/dd.c:1207
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
 device_del+0x481/0xd90 drivers/base/core.c:3107
 usb_disable_device+0x387/0x930 drivers/usb/core/message.c:1245
 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2217
 hub_port_connect drivers/usb/core/hub.c:5059 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Last call_rcu():
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_record_aux_stack+0x9e/0xb0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2894 [inline]
 call_rcu+0xe9/0xb90 kernel/rcu/tree.c:2968
 blk_stat_free_callback+0x26/0x30 block/blk-stat.c:181
 blk_release_queue+0xa3/0x3b0 block/blk-sysfs.c:933
 kobject_cleanup lib/kobject.c:704 [inline]
 kobject_release lib/kobject.c:735 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c8/0x540 lib/kobject.c:752
 scsi_device_dev_release_usercontext+0x5d6/0xcb0 drivers/scsi/scsi_sysfs.c:465
 execute_in_process_context+0x37/0x150 kernel/workqueue.c:3321
 device_release+0x71/0x200 drivers/base/core.c:1800
 kobject_cleanup lib/kobject.c:704 [inline]
 kobject_release lib/kobject.c:735 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c8/0x540 lib/kobject.c:752
 put_device+0x1b/0x30 drivers/base/core.c:3029
 __scsi_remove_device+0x1dd/0x3d0 drivers/scsi/scsi_sysfs.c:1455
 scsi_probe_and_add_lun+0x1d49/0x2d20 drivers/scsi/scsi_scan.c:1177
 __scsi_scan_target+0x21d/0xba0 drivers/scsi/scsi_scan.c:1561
 scsi_scan_channel drivers/scsi/scsi_scan.c:1649 [inline]
 scsi_scan_channel+0x14b/0x1f0 drivers/scsi/scsi_scan.c:1625
 scsi_scan_host_selected+0x297/0x350 drivers/scsi/scsi_scan.c:1678
 do_scsi_scan_host+0x1e8/0x260 drivers/scsi/scsi_scan.c:1816
 scsi_scan_host drivers/scsi/scsi_scan.c:1846 [inline]
 scsi_scan_host+0x37c/0x440 drivers/scsi/scsi_scan.c:1834
 virtscsi_probe+0x8d2/0xb26 drivers/scsi/virtio_scsi.c:912
 virtio_dev_probe+0x445/0x6f0 drivers/virtio/virtio.c:248
 really_probe+0x291/0xde0 drivers/base/dd.c:553
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738
 device_driver_attach+0x228/0x290 drivers/base/dd.c:1013
 __driver_attach+0x15b/0x2f0 drivers/base/dd.c:1090
 bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:305
 bus_add_driver+0x3a9/0x630 drivers/base/bus.c:622
 driver_register+0x220/0x3a0 drivers/base/driver.c:171
 INIT_LIST_HEAD include/linux/list.h:35 [inline]
 init+0xa0/0xf4 drivers/char/virtio_console.c:2249
 do_one_initcall+0x10a/0x694 init/main.c:1204
 do_initcall_level init/main.c:1277 [inline]
 do_initcalls init/main.c:1293 [inline]
 do_basic_setup init/main.c:1313 [inline]
 kernel_init_freeable+0x57c/0x600 init/main.c:1512
 kernel_init+0xd/0x1b9 init/main.c:1402
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff8881d5be2500
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes inside of
 192-byte region [ffff8881d5be2500, ffff8881d5be25c0)
The buggy address belongs to the page:
page:0000000091e2a842 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d5be2
flags: 0x200000000000200(slab)
raw: 0200000000000200 ffffea00070f7bc0 0000000c0000000c ffff8881da041500
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d5be2400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d5be2480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881d5be2500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881d5be2580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881d5be2600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================