general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:593
Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 03 a6 d2 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48
RSP: 0018:ffff8881da267258 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff8881d501cf00 RCX: ffffffff8216169e
RDX: 000000000000000c RSI: ffffffff816cbc1d RDI: 0000000000000064
RBP: 0000000000000000 R08: ffff8881da24b100 R09: fffffbfff126768f
R10: fffffbfff126768e R11: ffffffff8933b477 R12: 0000000000000000
R13: ffff8881d51da000 R14: ffff8881cdbb4000 R15: ffff8881c754e070
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c4368 CR3: 00000001ce6df000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tty_unregister_device drivers/tty/tty_io.c:3195 [inline]
 tty_unregister_device+0x10d/0x1a0 drivers/tty/tty_io.c:3190
 hso_serial_tty_unregister drivers/net/usb/hso.c:2232 [inline]
 hso_create_bulk_serial_device drivers/net/usb/hso.c:2678 [inline]
 hso_probe.cold+0x6e/0x14c drivers/net/usb/hso.c:2944
 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
 really_probe+0x290/0xac0 drivers/base/dd.c:551
 driver_probe_device+0x223/0x350 drivers/base/dd.c:724
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:831
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x217/0x390 drivers/base/dd.c:897
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1459/0x1bf0 drivers/base/core.c:2487
 usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
 really_probe+0x290/0xac0 drivers/base/dd.c:551
 driver_probe_device+0x223/0x350 drivers/base/dd.c:724
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:831
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x217/0x390 drivers/base/dd.c:897
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1459/0x1bf0 drivers/base/core.c:2487
 usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2538
 hub_port_connect drivers/usb/core/hub.c:5185 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5325 [inline]
 port_event drivers/usb/core/hub.c:5471 [inline]
 hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5553
 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 0e77ad829b65f389 ]---
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:593
Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 03 a6 d2 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48
RSP: 0018:ffff8881da267258 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff8881d501cf00 RCX: ffffffff8216169e
RDX: 000000000000000c RSI: ffffffff816cbc1d RDI: 0000000000000064
RBP: 0000000000000000 R08: ffff8881da24b100 R09: fffffbfff126768f
R10: fffffbfff126768e R11: ffffffff8933b477 R12: 0000000000000000
R13: ffff8881d51da000 R14: ffff8881cdbb4000 R15: ffff8881c754e070
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c4368 CR3: 00000001ce6df000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400