[[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[ 14.717303][ C1] random: crng init done [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.761052][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 27.000977][ T12] usb 1-1: Using ep0 maxpacket: 16 [ 27.121055][ T12] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 27.132076][ T12] usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 [ 27.144886][ T12] usb 1-1: New USB device found, idVendor=045e, idProduct=07da, bcdDevice= 0.00 [ 27.153923][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 27.163155][ T12] usb 1-1: config 0 descriptor?? [ 27.659689][ T12] input: HID 045e:07da as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/0003:045E:07DA.0001/input/input5 [ 27.743724][ T12] microsoft 0003:045E:07DA.0001: input,hidraw0: USB HID v0.00 Device [HID 045e:07da] on usb-dummy_hcd.0-1/input0 [ 27.871817][ C0] ================================================================== [ 27.879981][ C0] BUG: KASAN: use-after-free in hidinput_hid_event+0x1111/0x15d3 [ 27.887681][ C0] Read of size 8 at addr ffff8881cffdc000 by task swapper/0/0 [ 27.895107][ C0] [ 27.897442][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc2-syzkaller #0 [ 27.905303][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.915333][ C0] Call Trace: [ 27.918593][ C0] <IRQ> [ 27.921429][ C0] dump_stack+0xef/0x16e [ 27.925648][ C0] ? hidinput_hid_event+0x1111/0x15d3 [ 27.930997][ C0] ? hidinput_hid_event+0x1111/0x15d3 [ 27.936346][ C0] print_address_description.constprop.0+0x16/0x200 [ 27.942910][ C0] ? hidinput_hid_event+0x1111/0x15d3 [ 27.948255][ C0] ? hidinput_hid_event+0x1111/0x15d3 [ 27.953601][ C0] __kasan_report.cold+0x37/0x7f [ 27.958547][ C0] ? hidinput_hid_event+0x1111/0x15d3 [ 27.963909][ C0] kasan_report+0xe/0x20 [ 27.968142][ C0] check_memory_region+0x152/0x1c0 [ 27.973234][ C0] hidinput_hid_event+0x1111/0x15d3 [ 27.978409][ C0] hid_process_event+0x4a0/0x580 [ 27.983322][ C0] ? hid_field_extract+0xe4/0x170 [ 27.988326][ C0] ? mf_play.cold+0x99/0x99 [ 27.992805][ C0] ? kmalloc_order_trace+0xe4/0x110 [ 27.997976][ C0] hid_report_raw_event+0xabb/0xed0 [ 28.003170][ C0] ? ttusb_dec_process_urb_frame_list+0x522/0x1ce0 [ 28.009652][ C0] hid_input_report+0x315/0x3f0 [ 28.014488][ C0] ? ktime_get_mono_fast_ns+0x163/0x1f0 [ 28.020017][ C0] hid_i