snd_usb_toneport 5-1:0.0: set_interface failed
snd_usb_toneport 5-1:0.0: Line 6 POD Studio UX2 now disconnected
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BUG: KASAN: use-after-free in __list_del_entry_valid+0x15e/0x170
Read of size 8 at addr ffff8881d372fae8 by task kworker/1:2/5666

CPU: 1 PID: 5666 Comm: kworker/1:2 Not tainted 5.1.0-rc3+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 dump_stack+0xca/0x13e
 print_address_description+0x67/0x231
 kasan_report.cold+0x1a/0x35
 __list_del_entry_valid+0x15e/0x170
 snd_info_free_entry+0x132/0x340
 snd_info_card_free+0x3e/0x80
 release_card_device+0x63/0xd0
 device_release+0x78/0x210
 kobject_put+0x17d/0x270
 put_device+0x1c/0x30
 snd_card_free_when_closed+0x35/0x50
 line6_disconnect.cold+0xa3/0xbc
 line6_probe+0xb1e/0x1140
 usb_probe_interface+0x30d/0x7b0
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_set_configuration+0xdf2/0x1670
 generic_probe+0x9d/0xd5
 usb_probe_device+0xa8/0x110
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_new_device.cold+0x8b8/0x1030
 hub_event+0x1ac9/0x35a0
 process_one_work+0x90a/0x1580
 worker_thread+0x96/0xe20
 kthread+0x30e/0x420
 ret_from_fork+0x3a/0x50

Allocated by task 12:
 __kasan_kmalloc.constprop.0+0xbf/0xd0
 snd_info_create_entry+0x51/0x400
 create_subdir+0x22/0xa0
 snd_info_card_create+0xca/0x230
 snd_card_new+0x618/0x920
 line6_probe+0x130/0x1140
 usb_probe_interface+0x30d/0x7b0
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_set_configuration+0xdf2/0x1670
 generic_probe+0x9d/0xd5
 usb_probe_device+0xa8/0x110
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_new_device.cold+0x8b8/0x1030
 hub_event+0x1ac9/0x35a0
 process_one_work+0x90a/0x1580
 worker_thread+0x96/0xe20
 kthread+0x30e/0x420
 ret_from_fork+0x3a/0x50

Freed by task 12:
 __kasan_slab_free+0x130/0x180
 kfree+0xd7/0x290
 snd_info_free_entry+0x295/0x340
 snd_info_card_free+0x3e/0x80
 release_card_device+0x63/0xd0
 device_release+0x78/0x210
 kobject_put+0x17d/0x270
 put_device+0x1c/0x30
 snd_card_free_when_closed+0x35/0x50
 line6_disconnect.cold+0xa3/0xbc
 line6_probe+0xb1e/0x1140
 usb_probe_interface+0x30d/0x7b0
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_set_configuration+0xdf2/0x1670
 generic_probe+0x9d/0xd5
 usb_probe_device+0xa8/0x110
 really_probe+0x296/0x680
 driver_probe_device+0xf9/0x200
 __device_attach_driver+0x1c4/0x230
 bus_for_each_drv+0x15e/0x1e0
 __device_attach+0x21e/0x360
 bus_probe_device+0x1ec/0x2a0
 device_add+0xaf4/0x1700
 usb_new_device.cold+0x8b8/0x1030
 hub_event+0x1ac9/0x35a0
 process_one_work+0x90a/0x1580
 worker_thread+0x96/0xe20
 kthread+0x30e/0x420
 ret_from_fork+0x3a/0x50

The buggy address belongs to the object at ffff8881d372fa00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 232 bytes inside of
 256-byte region [ffff8881d372fa00, ffff8881d372fb00)
The buggy address belongs to the page:
page:ffffea00074dcbc0 count:1 mapcount:0 mapping:ffff8881dac02e00 index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 dead000000000100 dead000000000200 ffff8881dac02e00
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d372f980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881d372fa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d372fa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8881d372fb00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8881d372fb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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