usb 6-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 6-1: config 0 descriptor??
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 10223 Comm: kworker/1:0 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:vmk80xx_write_packet+0x75/0x260 drivers/staging/comedi/drivers/vmk80xx.c:204
Code: 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cf 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 70 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 0f 85 80 01 00 00
RSP: 0018:ffff8881cace7118 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881d5023800 RCX: ffffc9000da90000
RDX: 0000000000000002 RSI: ffffffff84b62873 RDI: ffff8881d5023870
RBP: ffff8881d3909000 R08: 0000000000000000 R09: 0000000000000010
R10: 0000000000000000 R11: 000000000004e017 R12: 0000000000000010
R13: ffff8881c74ab000 R14: 0000000000000000 R15: ffffed103a445024
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc5f0fcf48 CR3: 00000001ad09b000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vmk80xx_reset_device drivers/staging/comedi/drivers/vmk80xx.c:226 [inline]
 vmk80xx_auto_attach+0x141e/0x1840 drivers/staging/comedi/drivers/vmk80xx.c:814
 comedi_auto_config+0x16e/0x250 drivers/staging/comedi/drivers.c:1067
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 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:2926
 usb_set_configuration+0x1111/0x1880 drivers/usb/core/message.c:2165
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:240
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 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:2926
 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x2348/0x42b0 drivers/usb/core/hub.c:5590
 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
Modules linked in:
---[ end trace 66bb516659b6b81c ]---
RIP: 0010:vmk80xx_write_packet+0x75/0x260 drivers/staging/comedi/drivers/vmk80xx.c:204
Code: 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cf 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 70 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 0f 85 80 01 00 00
RSP: 0018:ffff8881cace7118 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881d5023800 RCX: ffffc9000da90000
RDX: 0000000000000002 RSI: ffffffff84b62873 RDI: ffff8881d5023870
RBP: ffff8881d3909000 R08: 0000000000000000 R09: 0000000000000010
R10: 0000000000000000 R11: 000000000004e017 R12: 0000000000000010
R13: ffff8881c74ab000 R14: 0000000000000000 R15: ffffed103a445024
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc5f0fcf48 CR3: 00000001ad09b000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400