[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 14.487525][ C1] random: crng init done [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 21.657607][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 22.017671][ T12] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 22.028650][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 0 [ 22.038428][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 0 [ 22.207671][ T12] usb 1-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 [ 22.216707][ T12] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 22.224729][ T12] usb 1-1: Product: syz [ 22.228965][ T12] usb 1-1: Manufacturer: syz [ 22.233542][ T12] usb 1-1: SerialNumber: syz [ 23.377687][ T12] cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 [ 23.384307][ T12] cdc_ncm 1-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 [ 23.391759][ T12] cdc_ncm 1-1:1.0: setting rx_max = 2048 [ 23.607653][ T12] divide error: 0000 [#1] SMP KASAN [ 23.612906][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc7+ #0 [ 23.620253][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.630298][ T12] Workqueue: usb_hub_wq hub_event [ 23.635306][ T12] RIP: 0010:usbnet_update_max_qlen+0x231/0x370 [ 23.641560][ T12] Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 46 01 00 00 48 8d bb f4 00 00 00 31 d2 b8 c8 63 01 00 48 89 f9 <48> f7 b3 a8 01 00 00 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 0f [ 23.661148][ T12] RSP: 0018:ffff8881da20f010 EFLAGS: 00010246 [ 23.667195][ T12] RAX: 00000000000163c8 RBX: ffff8881d7b29bc0 RCX: ffff8881d7b29cb4 [ 23.675203][ T12] RDX: 0000000000000000 RSI: ffffffff8344ecde RDI: ffff8881d7b29cb4 [ 23.683208][ T12] RBP: 0000000000000003 R08: ffff8881da1f9800 R09: ffffed103af6522a [ 23.691206][ T12] R10: ffffed103af65229 R11: ffff8881d7b2914f R12: 0000000000000000 [ 23.699245][ T12] R13: ffff8881d7b29d38 R14: ffff8881d7b29bc0 R15: ffff8881d2f6aa00 [ 23.707285][ T12] FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 [ 23.716244][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.722856][ T12] CR2: 00000000004c2028 CR3: 00000001d3fb4000 CR4: 00000000001406f0 [ 23.730873][ T12] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.738877][ T12] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.746830][ T12] Call Trace: [ 23.750107][ T12] cdc_ncm_update_rxtx_max+0x8e9/0xef0 [ 23.755631][ T12] ? cdc_ncm_select_altsetting+0x1a0/0x1a0 [ 23.761414][ T12] cdc_ncm_bind_common+0x1005/0x2570 [ 23.766677][ T12] ? cdc_ncm_align_tail+0x1b0/0x1b0 [ 23.771861][ T12] ? __debug_object_init+0x47c/0xdd0 [ 23.777127][ T12] ? lockdep_init_map+0x1b0/0x5e0 [ 23.782213][ T12] cdc_ncm_bind+0x7c/0x1c0 [ 23.786628][ T12] ? cdc_ncm_bind_common+0x2570/0x2570 [ 23.792074][ T12] usbnet_probe+0xb43/0x23cf [ 23.796754][ T12] usb_probe_interface+0x305/0x7a0 [ 23.801849][ T12] ? usb_probe_device+0x100/0x100 [ 23.806858][ T12] really_probe+0x281/0x6d0 [ 23.811347][ T12] driver_probe_device+0x101/0x1b0 [ 23.816437][ T12] __device_attach_driver+0x1c2/0x220 [ 23.821790][ T12] ? driver_allows_async_probing+0x160/0x160 [ 23.827747][ T12] bus_for_each_drv+0x162/0x1e0 [ 23.832582][ T12] ? bus_rescan_devices+0x20/0x20 [ 23.837623][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 23.843414][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 23.848708][ T12] __device_attach+0x217/0x360 [ 23.853540][ T12] ? device_bind_driver+0xd0/0xd0 [ 23.858543][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 23.863840][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 23.869118][ T12] bus_probe_device+0x1e4/0x290 [ 23.874008][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 23.879890][ T12] device_add+0xae6/0x16f0 [ 23.884348][ T12] ? uevent_store+0x50/0x50 [ 23.888841][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 23.894632][ T12] usb_set_configuration+0xdf6/0x1670 [ 23.899984][ T12] generic_probe+0x9d/0xd5 [ 23.904448][ T12] usb_probe_device+0x99/0x100 [ 23.909190][ T12] ? usb_suspend+0x620/0x620 [ 23.913899][ T12] really_probe+0x281/0x6d0 [ 23.918393][ T12] driver_probe_device+0x101/0x1b0 [ 23.923495][ T12] __device_attach_driver+0x1c2/0x220 [ 23.928967][ T12] ? driver_allows_async_probing+0x160/0x160 [ 23.934937][ T12] bus_for_each_drv+0x162/0x1e0 [ 23.939776][ T12] ? bus_rescan_devices+0x20/0x20 [ 23.944798][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 23.950593][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 23.955864][ T12] __device_attach+0x217/0x360 [ 23.960612][ T12] ? device_bind_driver+0xd0/0xd0 [ 23.965620][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 23.970891][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 23.976271][ T12] bus_probe_device+0x1e4/0x290 [ 23.981156][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 23.987027][ T12] device_add+0xae6/0x16f0 [ 23.991423][ T12] ? uevent_store+0x50/0x50 [ 23.995905][ T12] usb_new_device.cold+0x6a4/0xe79 [ 24.001081][ T12] hub_event+0x1b5c/0x3640 [ 24.005479][ T12] ? hub_port_debounce+