[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. [ 14.972082][ 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 '10.128.0.202' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.191719][ T83] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 49.551800][ T83] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 49.562825][ T83] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 0 [ 49.572591][ T83] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 0 [ 49.741777][ T83] usb 1-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 [ 49.750813][ T83] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 49.758843][ T83] usb 1-1: Product: syz [ 49.763015][ T83] usb 1-1: Manufacturer: syz [ 49.767590][ T83] usb 1-1: SerialNumber: syz [ 50.911784][ T83] cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 [ 50.918288][ T83] cdc_ncm 1-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 [ 50.925736][ T83] cdc_ncm 1-1:1.0: setting rx_max = 2048 [ 51.121744][ T83] divide error: 0000 [#1] SMP KASAN [ 51.127182][ T83] CPU: 1 PID: 83 Comm: kworker/1:2 Not tainted 5.3.0+ #0 [ 51.134178][ T83] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.144219][ T83] Workqueue: usb_hub_wq hub_event [ 51.149227][ T83] RIP: 0010:usbnet_update_max_qlen+0x231/0x370 [ 51.155361][ T83] 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 [ 51.175561][ T83] RSP: 0018:ffff8881d93cf000 EFLAGS: 00010246 [ 51.181616][ T83] RAX: 00000000000163c8 RBX: ffff8881d07b9bc0 RCX: ffff8881d07b9cb4 [ 51.189567][ T83] RDX: 0000000000000000 RSI: ffffffff8348796e RDI: ffff8881d07b9cb4 [ 51.198915][ T83] RBP: 0000000000000003 R08: ffff8881d93b9800 R09: ffffed103a0f722a [ 51.206872][ T83] R10: ffffed103a0f7229 R11: ffff8881d07b914f R12: 0000000000000000 [ 51.214819][ T83] R13: ffff8881d07b9d38 R14: ffff8881d07b9bc0 R15: ffff8881d040ec80 [ 51.222777][ T83] FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 [ 51.231819][ T83] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.238384][ T83] CR2: 00000000004c7728 CR3: 00000001d466a000 CR4: 00000000001406e0 [ 51.246353][ T83] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.254313][ T83] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.262266][ T83] Call Trace: [ 51.265554][ T83] cdc_ncm_update_rxtx_max+0x8e9/0xef0 [ 51.271018][ T83] ? cdc_ncm_select_altsetting+0x1a0/0x1a0 [ 51.276810][ T83] cdc_ncm_bind_common+0x1005/0x2570 [ 51.282078][ T83] ? cdc_ncm_align_tail+0x1b0/0x1b0 [ 51.287692][ T83] ? lockdep_init_map+0x1b0/0x5e0 [ 51.292711][ T83] cdc_ncm_bind+0x7c/0x1c0 [ 51.297105][ T83] ? cdc_ncm_bind_common+0x2570/0x2570 [ 51.302539][ T83] usbnet_probe+0xb43/0x23cf [ 51.307117][ T83] usb_probe_interface+0x305/0x7a0 [ 51.312213][ T83] ? usb_probe_device+0x100/0x100 [ 51.317225][ T83] really_probe+0x281/0x6d0 [ 51.321705][ T83] driver_probe_device+0x104/0x210 [ 51.326806][ T83] __device_attach_driver+0x1c2/0x220 [ 51.332165][ T83] ? driver_allows_async_probing+0x160/0x160 [ 51.338119][ T83] bus_for_each_drv+0x162/0x1e0 [ 51.342942][ T83] ? bus_rescan_devices+0x20/0x20 [ 51.347940][ T83] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 51.353742][ T83] ? lockdep_hardirqs_on+0x382/0x580 [ 51.359015][ T83] __device_attach+0x217/0x360 [ 51.363761][ T83] ? device_bind_driver+0xd0/0xd0 [ 51.368764][ T83] ? kobject_uevent_env+0x29e/0x1150 [ 51.374025][ T83] ? kobject_uevent_env+0x2a8/0x1150 [ 51.380770][ T83] bus_probe_device+0x1e4/0x290 [ 51.385599][ T83] ? blocking_notifier_call_chain+0x54/0xa0 [ 51.391476][ T83] device_add+0xae6/0x16f0 [ 51.395879][ T83] ? uevent_store+0x50/0x50 [ 51.400357][ T83] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 51.406137][ T83] usb_set_configuration+0xdf6/0x1670 [ 51.411483][ T83] generic_probe+0x9d/0xd5 [ 51.415873][ T83] usb_probe_device+0x99/0x100 [ 51.421652][ T83] ? usb_suspend+0x620/0x620 [ 51.426217][ T83] really_probe+0x281/0x6d0 [ 51.430692][ T83] driver_probe_device+0x104/0x210 [ 51.435783][ T83] __device_attach_driver+0x1c2/0x220 [ 51.441141][ T83] ? driver_allows_async_probing+0x160/0x160 [ 51.447190][ T83] bus_for_each_drv+0x162/0x1e0 [ 51.452014][ T83] ? bus_rescan_devices+0x20/0x20 [ 51.457012][ T83] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 51.462791][ T83] ? lockdep_hardirqs_on+0x382/0x580 [ 51.468049][ T83] __device_attach+0x217/0x360 [ 51.472809][ T83] ? device_bind_driver+0xd0/0xd0 [ 51.477826][ T83] ? kobject_uevent_env+0x29e/0x1150 [ 51.483086][ T83] ? kobject_uevent_env+0x2a8/0x1150 [ 51.488372][ T83] bus_probe_device+0x1e4/0x290 [ 51.493199][ T83] ? blocking_notifier_call_chain+0x54/0xa0 [ 51.500024][ T83] device_add+0xae6/0x16f0 [ 51.504413][ T83] ? uevent_store+0x50/0x50 [ 51.508891][ T83] usb_new_device.cold+0x6a4/0xe79 [ 51.513975][ T83] hub_event+0x1b5c/0x3640 [ 51.518368][ T83] ? hub_port_debounce+0x260/0x260 [ 51.523466][ T83] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 51.528996][ T83] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 51.534256][ T83] process_one_work+0x92b/0x1530 [ 51.539971][ T83] ? pwq_dec_nr_in_flight+0x310/0x310 [ 51.545325][ T83] ? do_raw_spin_lock+0x11a/0x280 [ 51.550335][ T83] worker_thread+0x96/0xe20 [ 51.554921][ T83] ? process_one_work+0x1530/0x1530 [ 51.560090][ T83] kthread+0x318/0x420 [ 51.564151][ T83] ? kthread_create_on_node+0xf0/0xf0 [ 51.569499][ T83] ret_from_fork+0x24/0x30