Warning: Permanently added '10.128.0.156' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.790154][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 32.150276][ T12] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 32.161514][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 0 [ 32.171379][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 0 [ 32.340251][ T12] usb 1-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 [ 32.349315][ T12] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 32.357376][ T12] usb 1-1: Product: syz [ 32.361562][ T12] usb 1-1: Manufacturer: syz [ 32.366164][ T12] usb 1-1: SerialNumber: syz [ 33.510281][ T12] cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 [ 33.516899][ T12] cdc_ncm 1-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 [ 33.524359][ T12] cdc_ncm 1-1:1.0: setting rx_max = 2048 [ 33.730200][ T12] divide error: 0000 [#1] SMP KASAN [ 33.735563][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc7+ #0 [ 33.742932][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.753067][ T12] Workqueue: usb_hub_wq hub_event [ 33.758165][ T12] RIP: 0010:usbnet_update_max_qlen+0x231/0x370 [ 33.764296][ 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 [ 33.784105][ T12] RSP: 0018:ffff8881da20f010 EFLAGS: 00010246 [ 33.790153][ T12] RAX: 00000000000163c8 RBX: ffff8881d54cbdc0 RCX: ffff8881d54cbeb4 [ 33.798130][ T12] RDX: 0000000000000000 RSI: ffffffff8344ecde RDI: ffff8881d54cbeb4 [ 33.806091][ T12] RBP: 0000000000000003 R08: ffff8881da1f9800 R09: ffffed103aa9966a [ 33.814051][ T12] R10: ffffed103aa99669 R11: ffff8881d54cb34f R12: 0000000000000000 [ 33.822003][ T12] R13: ffff8881d54cbf38 R14: ffff8881d54cbdc0 R15: ffff8881d2b8a280 [ 33.829961][ T12] FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 [ 33.838899][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.845462][ T12] CR2: 00007f1bcc99f000 CR3: 00000001d3c6c000 CR4: 00000000001406f0 [ 33.853424][ T12] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.861399][ T12] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.869363][ T12] Call Trace: [ 33.872646][ T12] cdc_ncm_update_rxtx_max+0x8e9/0xef0 [ 33.878099][ T12] ? cdc_ncm_select_altsetting+0x1a0/0x1a0 [ 33.884159][ T12] cdc_ncm_bind_common+0x1005/0x2570 [ 33.889455][ T12] ? cdc_ncm_align_tail+0x1b0/0x1b0 [ 33.894635][ T12] ? __debug_object_init+0x47c/0xdd0 [ 33.899909][ T12] ? lockdep_init_map+0x1b0/0x5e0 [ 33.904930][ T12] cdc_ncm_bind+0x7c/0x1c0 [ 33.909338][ T12] ? cdc_ncm_bind_common+0x2570/0x2570 [ 33.914798][ T12] usbnet_probe+0xb43/0x23cf [ 33.919381][ T12] usb_probe_interface+0x305/0x7a0 [ 33.924473][ T12] ? usb_probe_device+0x100/0x100 [ 33.929479][ T12] really_probe+0x281/0x6d0 [ 33.934046][ T12] driver_probe_device+0x101/0x1b0 [ 33.939140][ T12] __device_attach_driver+0x1c2/0x220 [ 33.944871][ T12] ? driver_allows_async_probing+0x160/0x160 [ 33.950825][ T12] bus_for_each_drv+0x162/0x1e0 [ 33.955652][ T12] ? bus_rescan_devices+0x20/0x20 [ 33.961365][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 33.967284][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 33.972558][ T12] __device_attach+0x217/0x360 [ 33.977321][ T12] ? device_bind_driver+0xd0/0xd0 [ 33.982337][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 33.987608][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 33.992889][ T12] bus_probe_device+0x1e4/0x290 [ 33.997744][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 34.005635][ T12] device_add+0xae6/0x16f0 [ 34.010030][ T12] ? uevent_store+0x50/0x50 [ 34.014510][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 34.020295][ T12] usb_set_configuration+0xdf6/0x1670 [ 34.025668][ T12] generic_probe+0x9d/0xd5 [ 34.030066][ T12] usb_probe_device+0x99/0x100 [ 34.034898][ T12] ? usb_suspend+0x620/0x620 [ 34.039461][ T12] really_probe+0x281/0x6d0 [ 34.043949][ T12] driver_probe_device+0x101/0x1b0 [ 34.049040][ T12] __device_attach_driver+0x1c2/0x220 [ 34.054391][ T12] ? driver_allows_async_probing+0x160/0x160 [ 34.060357][ T12] bus_for_each_drv+0x162/0x1e0 [ 34.065183][ T12] ? bus_rescan_devices+0x20/0x20 [ 34.070213][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 34.076085][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 34.081364][ T12] __device_attach+0x217/0x360 [ 34.086106][ T12] ? device_bind_driver+0xd0/0xd0 [ 34.091119][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 34.096379][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 34.101641][ T12] bus_probe_device+0x1e4/0x290 [ 34.106470][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 34.112520][ T12] device_add+0xae6/0x16f0 [ 34.116921][ T12] ? uevent_store+0x50/0x50 [ 34.121404][ T12] usb_new_device.cold+0x6a4/0xe79 [ 34.126502][ T12] hub_event+0x1b5c/0x3640 [ 34.130895][ T12] ? hub_port_debounce+0x260/0x260 [ 34.135982][ T12] process_one_work+0x92b/0x1530 [ 34.141795][ T12] ? pwq_dec_nr_in_flight+0x310/0x310 [ 34.147149][ T12] ? do_raw_spin_lock+0x11a/0x280 [ 34.152186][ T12] worker_thread+0x96/0xe20 [ 34.156668][ T12] ? process_one_work+0x1530/0x1530 [ 34.161853][ T12] kthread+0x318/0x420 [ 34.165908][ T12] ? kthread_create_on_node+0xf0/0xf0 [ 34.171257][ T12] ret_from_fork+0x24/0x30 [ 34.175732][ T12] Modules linked in: [ 34.179746][ T12] ---[