[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.424143][ T17] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 69.664046][ T17] usb 1-1: Using ep0 maxpacket: 8 [ 69.784280][ T17] usb 1-1: config 0 interface 0 altsetting 0 bulk endpoint 0x8A has invalid maxpacket 31 [ 69.794398][ T17] usb 1-1: New USB device found, idVendor=324b, idProduct=5963, bcdDevice= 0.d2 [ 69.803429][ T17] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 69.816524][ T17] usb 1-1: config 0 descriptor?? [ 69.835351][ T8510] raw-gadget gadget: fail, usb_ep_enable returned -22 [ 69.858614][ T17] usb 1-1: MIDIStreaming interface descriptor not found [ 69.866288][ T17] ================================================================================ [ 69.875792][ T17] UBSAN: shift-out-of-bounds in sound/usb/midi.c:1928:8 [ 69.882743][ T17] shift exponent 244 is too large for 32-bit type 'int' [ 69.890165][ T17] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.10.0-syzkaller #0 [ 69.898180][ T17] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.908229][ T17] Workqueue: usb_hub_wq hub_event [ 69.913263][ T17] Call Trace: [ 69.916528][ T17] dump_stack+0x107/0x163 [ 69.920886][ T17] ubsan_epilogue+0xb/0x5a [ 69.925290][ T17] __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 [ 69.932047][ T17] ? __snd_usbmidi_create+0xb0/0x2320 [ 69.937415][ T17] snd_usbmidi_get_ms_info.cold+0x83/0xd4 [ 69.943150][ T17] __snd_usbmidi_create+0x380/0x2320 [ 69.948421][ T17] ? __mutex_unlock_slowpath+0xe2/0x610 [ 69.953968][ T17] ? snd_usbmidi_input_close+0x40/0x40 [ 69.959419][ T17] ? snd_info_create_entry+0x32d/0x420 [ 69.964868][ T17] snd_usb_create_quirk+0xa5/0xe0 [ 69.969893][ T17] usb_audio_probe+0x623/0x2ab0 [ 69.974739][ T17] ? snd_usb_create_stream.isra.0+0x530/0x530 [ 69.980805][ T17] ? mark_held_locks+0x9f/0xe0 [ 69.98