Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.158136][ T83] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 25.517813][ T83] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 25.529076][ T83] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 0 [ 25.539004][ T83] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 0 [ 25.707797][ T83] usb 1-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 [ 25.717350][ T83] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 25.725401][ T83] usb 1-1: Product: syz [ 25.729609][ T83] usb 1-1: Manufacturer: syz [ 25.734282][ T83] usb 1-1: SerialNumber: syz [ 26.877775][ T83] cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 [ 26.884415][ T83] cdc_ncm 1-1:1.0: dwNtbInMaxSize=1 is too small. Using 2048 [ 26.891890][ T83] cdc_ncm 1-1:1.0: setting rx_max = 2048 [ 27.097726][ T83] cdc_ncm 1-1:1.0: setting tx_max = 16384 [ 27.103736][ T83] divide error: 0000 [#1] SMP KASAN [ 27.108914][ T83] CPU: 1 PID: 83 Comm: kworker/1:2 Not tainted 5.3.0+ #0 [ 27.116167][ T83] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.126334][ T83] Workqueue: usb_hub_wq hub_event [ 27.131627][ T83] RIP: 0010:cdc_ncm_update_rxtx_max+0xc6e/0xef0 [ 27.137849][ T83] Code: e0 07 38 c2 0f 9e c1 84 d2 0f 95 c0 84 c1 0f 85 35 02 00 00 0f b7 5b 04 81 e3 ff 07 00 00 e8 19 1d f4 fd 31 d2 44 89 e0 31 ff f3 41 89 d5 89 d6 e8 76 1e f4 fd 45 85 ed 0f 85 17 f7 ff ff e8 [ 27.157537][ T83] RSP: 0018:ffff8881d93c7020 EFLAGS: 00010246 [ 27.163602][ T83] RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000001 [ 27.171581][ T83] RDX: 0000000000000000 RSI: ffffffff834a1f87 RDI: 0000000000000000 [ 27.179728][ T83] RBP: ffff8881d913b300 R08: ffff8881d975c800 R09: ffffed103b665d58 [ 27.187690][ T83] R10: ffffed103b665d57 R11: ffff8881db32eabf R12: 0000000000004000 [ 27.195639][ T83] R13: 0000000000000000 R14: ffff8881d2e50ac0 R15: ffff8881d2e3c500 [ 27.203590][ T83] FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 [ 27.212636][ T83] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.219218][ T83] CR2: 00000000004c2888 CR3: 00000001d46c8000 CR4: 00000000001406e0 [ 27.227190][ T83] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.235412][ T83] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.243361][ T83] Call Trace: [ 27.246653][ T83] ? cdc_ncm_select_altsetting+0x1a0/0x1a0 [ 27.252438][ T83] cdc_ncm_bind_common+0x1005/0x2570 [ 27.257891][ T83] ? cdc_ncm_align_tail+0x1b0/0x1b0 [ 27.263073][ T83] ? lockdep_init_map+0x1b0/0x5e0 [ 27.268260][ T83] cdc_ncm_bind+0x7c/0x1c0 [ 27.272663][ T83] ? cdc_ncm_bind_common+0x2570/0x2570 [ 27.278116][ T83] usbnet_probe+0xb43/0x23cf [ 27.282683][ T83] usb_probe_interface+0x305/0x7a0 [ 27.287770][ T83] ? usb_probe_device+0x100/0x100 [ 27.292772][ T83] really_probe+0x281/0x6d0 [ 27.297282][ T83] driver_probe_device+0x104/0x210 [ 27.302668][ T83] __device_attach_driver+0x1c2/0x220 [ 27.308245][ T83] ? driver_allows_async_probing+0x160/0x160 [ 27.314206][ T83] bus_for_each_drv+0x162/0x1e0 [ 27.319039][ T83] ? bus_rescan_devices+0x20/0x20 [ 27.324063][ T83] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 27.329896][ T83] ? lockdep_hardirqs_on+0x382/0x580 [ 27.335174][ T83] __device_attach+0x217/0x360 [ 27.339953][ T83] ? device_bind_driver+0xd0/0xd0 [ 27.344996][ T83] ? kobject_uevent_env+0x29e/0x1150 [ 27.350271][ T83] ? kobject_uevent_env+0x2a8/0x1150 [ 27.355832][ T83] bus_probe_device+0x1e4/0x290 [ 27.360700][ T83] ? blocking_notifier_call_chain+0x54/0xa0 [ 27.366664][ T83] device_add+0xae6/0x16f0 [ 27.371069][ T83] ? uevent_store+0x50/0x50 [ 27.376080][ T83] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 27.382002][ T83] usb_set_configuration+0xdf6/0x1670 [ 27.387473][ T83] generic_probe+0x9d/0xd5 [ 27.391903][ T83] usb_probe_device+0x99/0x100 [ 27.396649][ T83] ? usb_suspend+0x620/0x620 [ 27.401226][ T83] really_probe+0x281/0x6d0 [ 27.405739][ T83] driver_probe_device+0x104/0x210 [ 27.411004][ T83] __device_attach_driver+0x1c2/0x220 [ 27.416616][ T83] ? driver_allows_async_probing+0x160/0x160 [ 27.422595][ T83] bus_for_each_drv+0x162/0x1e0 [ 27.427679][ T83] ? bus_rescan_devices+0x20/0x20 [ 27.432782][ T83] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 27.438751][ T83] ? lockdep_hardirqs_on+0x382/0x580 [ 27.445068][ T83] __device_attach+0x217/0x360 [ 27.449850][ T83] ? device_bind_driver+0xd0/0xd0 [ 27.454858][ T83] ? kobject_uevent_env+0x29e/0x1150 [ 27.460160][ T83] ? kobject_uevent_env+0x2a8/0x1150 [ 27.465811][ T83] bus_probe_device+0x1e4/0x290 [ 27.470918][ T83] ? blocking_notifier_call_chain+0x54/0xa0 [ 27.477017][ T83] device_add+0xae6/0x16f0 [ 27.481427][ T83] ? uevent_store+0x50/0x50 [ 27.485929][ T83] usb_new_device.cold+0x6a4/0xe79 [ 27.491745][ T83] hub_event+0x1b5c/0x3640 [ 27.496466][ T83] ? hub_port_debounce+0x260/0x260 [ 27.501585][ T83] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 27.507140][ T83] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 27.512707][ T83] process_one_work+0x92b/0x1530 [ 27.517631][ T83] ? pwq_dec_nr_in_flight+0x310/0x310 [ 27.523466][ T83] ? do_raw_spin_lock+0x11a/0x280 [ 27.528559][ T83] worker_thread+0x96/0xe20 [ 27.533045][ T83] ? process_one_work+0x1530/0x1530 [ 27.538264][ T83] kthread+0x318/0x420 [ 27.542527][ T83] ? kthread_create_on_node+0xf0/0xf0 [ 27.547884][ T8