[  OK  ] Started Getty on tty2.
[  OK  ] Found device /dev/ttyS0.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Started OpenBSD Secure Shell server.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.159' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   54.329777][ T8366] IPVS: ftp: loaded support on port[0] = 21
[   54.680284][   T19] usb 1-1: new high-speed USB device number 2 using dummy_hcd
[   54.920922][   T19] usb 1-1: Using ep0 maxpacket: 8
[   55.040359][   T19] usb 1-1: New USB device found, idVendor=0403, idProduct=6010, bcdDevice=ca.64
[   55.049670][   T19] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[   55.063978][   T19] usb 1-1: config 0 descriptor??
[   55.103274][   T19] ftdi_sio 1-1:0.0: FTDI USB Serial Device converter detected
[   55.115391][   T19] usb 1-1: Detected FT-X
[   55.310177][   T19] ftdi_sio ttyUSB0: Unable to read latency timer: -32
[   55.800662][   T19] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[   55.998734][ T2922] usb 1-1: USB disconnect, device number 2
[   56.029108][ T2922] general protection fault, probably for non-canonical address 0xdffffc00000000b3: 0000 [#1] PREEMPT SMP KASAN
[   56.040924][ T2922] KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f]
[   56.049472][ T2922] CPU: 1 PID: 2922 Comm: kworker/1:2 Not tainted 5.11.0-syzkaller #0
[   56.057577][ T2922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.067759][ T2922] Workqueue: usb_hub_wq hub_event
[   56.072849][ T2922] RIP: 0010:__list_del_entry_valid+0x1f/0x100
[   56.079019][ T2922] Code: fd 0f 0b 0f 1f 84 00 00 00 00 00 41 57 41 56 41 54 53 49 89 fe 49 bc 00 00 00 00 00 fc ff df 48 83 c7 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 05 81 ec fd 4d 8b 7e 08 4c 89 f0 48 c1 e8
[   56.098758][ T2922] RSP: 0018:ffffc900014ef318 EFLAGS: 00010202
[   56.104943][ T2922] RAX: 00000000000000b3 RBX: 0000000000000000 RCX: ffff88801acb1bc0
[   56.113023][ T2922] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000598
[   56.121127][ T2922] RBP: dffffc0000000000 R08: dffffc0000000000 R09: fffffbfff1f28ab6
[   56.129093][ T2922] R10: fffffbfff1f28ab6 R11: 0000000000000000 R12: dffffc0000000000
[   56.137079][ T2922] R13: dffffc0000000000 R14: 0000000000000590 R15: 1ffff110023f3601
[   56.145305][ T2922] FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
[   56.154263][ T2922] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   56.160859][ T2922] CR2: 00000000004d5800 CR3: 000000000c48e000 CR4: 00000000001506e0
[   56.168916][ T2922] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   56.176885][ T2922] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   56.184855][ T2922] Call Trace:
[   56.188229][ T2922]  gpiodevice_release+0x48/0x1b0
[   56.193183][ T2922]  ? gpio_name_to_desc+0x230/0x230
[   56.198471][ T2922]  device_release+0x98/0x1c0
[   56.203061][ T2922]  kobject_cleanup+0x1c9/0x280
[   56.209364][ T2922]  ftdi_sio_port_remove+0x8b/0x2f0
[   56.214498][ T2922]  ? ftdi_sio_port_probe+0x13a0/0x13a0
[   56.219974][ T2922]  usb_serial_device_remove+0x126/0x1f0
[   56.225522][ T2922]  ? usb_serial_device_probe+0x2f0/0x2f0
[   56.231592][ T2922]  device_release_driver_internal+0x51e/0x7b0
[   56.237825][ T2922]  bus_remove_device+0x300/0x420
[   56.242762][ T2922]  device_del+0x5e1/0xa90
[   56.249381][ T2922]  usb_serial_disconnect+0x294/0x3c0
[   56.254843][ T2922]  usb_unbind_interface+0x1f2/0x860
[   56.260038][ T2922]  ? usb_driver_release_interface+0x1c0/0x1c0
[   56.266110][ T2922]  device_release_driver_internal+0x51e/0x7b0
[   56.272794][ T2922]  bus_remove_device+0x300/0x420
[   56.277736][ T2922]  device_del+0x5e1/0xa90
[   56.282233][ T2922]  usb_disable_device+0x407/0x800
[   56.287350][ T2922]  usb_disconnect+0x33a/0x8a0
[   56.293024][ T2922]  hub_port_connect+0x214/0x25b0
[   56.297966][ T2922]  ? lock_release+0x472/0x6b0
[   56.302629][ T2922]  ? hub_port_connect_change+0x5b4/0xab0
[   56.308641][ T2922]  ? hub_port_connect_change+0x5b4/0xab0
[   56.314369][ T2922]  ? __mutex_unlock_slowpath+0x12d/0x520
[   56.320014][ T2922]  hub_port_connect_change+0x5c6/0xab0
[   56.325823][ T2922]  ? hub_handle_remote_wakeup+0x18d/0x3f0
[   56.331553][ T2922]  port_event+0xa6f/0x10b0
[   56.335979][ T2922]  ? hub_event+0x40b/0xcb0
[   56.340387][ T2922]  ? _raw_spin_unlock_irq+0x1f/0x40
[   56.345574][ T2922]  hub_event+0x417/0xcb0
[   56