[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 14.464773][ C1] random: crng init done [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.092062][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 34.452136][ T12] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 34.463157][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 0 [ 34.472911][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 0 [ 34.642109][ T12] usb 1-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 [ 34.651413][ T12] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 34.659492][ T12] usb 1-1: Product: syz [ 34.663672][ T12] usb 1-1: Manufacturer: syz [ 34.668238][ T12] usb 1-1: SerialNumber: syz [ 36.032129][ T12] cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 [ 36.038632][ T12] cdc_ncm 1-1:1.0: setting rx_max = 16384 [ 36.242096][ T12] cdc_ncm 1-1:1.0: setting tx_max = 16384 [ 36.247847][ T12] divide error: 0000 [#1] SMP KASAN [ 36.253019][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0+ #0 [ 36.260008][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.270046][ T12] Workqueue: usb_hub_wq hub_event [ 36.275051][ T12] RIP: 0010:cdc_ncm_update_rxtx_max+0xc6e/0xef0 [ 36.281701][ T12] 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 89 12 f6 fd 31 d2 44 89 e0 31 ff f3 41 89 d5 89 d6 e8 e6 13 f6 fd 45 85 ed 0f 85 17 f7 ff ff e8 [ 36.301417][ T12] RSP: 0018:ffff8881da20f030 EFLAGS: 00010246 [ 36.307467][ T12] RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000001 [ 36.315421][ T12] RDX: 0000000000000000 RSI: ffffffff83482b77 RDI: 0000000000000000 [ 36.323366][ T12] RBP: ffff8881d2d19100 R08: ffff8881da1f9800 R09: ffffed103b645d58 [ 36.335825][ T12] R10: ffffed103b645d57 R11: ffff8881db22eabf R12: 0000000000004000 [ 36.343771][ T12] R13: 0000000000000000 R14: ffff8881d8189bc0 R15: ffff8881d2f52000 [ 36.351716][ T12] FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 [ 36.360633][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.367200][ T12] CR2: 00007ff031e0e000 CR3: 00000001d46dc000 CR4: 00000000001406f0 [ 36.375196][ T12] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.383147][ T12] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.391096][ T12] Call Trace: [ 36.394366][ T12] ? cdc_ncm_select_altsetting+0x1a0/0x1a0 [ 36.400229][ T12] cdc_ncm_bind_common+0x1005/0x2570 [ 36.405595][ T12] ? cdc_ncm_align_tail+0x1b0/0x1b0 [ 36.410871][ T12] ? lockdep_init_map+0x1b0/0x5e0 [ 36.416000][ T12] cdc_ncm_bind+0x7c/0x1c0 [ 36.420396][ T12] ? cdc_ncm_bind_common+0x2570/0x2570 [ 36.425829][ T12] usbnet_probe+0xb43/0x23cf [ 36.430397][ T12] usb_probe_interface+0x305/0x7a0 [ 36.435492][ T12] ? usb_probe_device+0x100/0x100 [ 36.440519][ T12] really_probe+0x281/0x6d0 [ 36.444999][ T12] driver_probe_device+0x101/0x1b0 [ 36.450082][ T12] __device_attach_driver+0x1c2/0x220 [ 36.455427][ T12] ? driver_allows_async_probing+0x160/0x160 [ 36.461378][ T12] bus_for_each_drv+0x162/0x1e0 [ 36.466212][ T12] ? bus_rescan_devices+0x20/0x20 [ 36.471211][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 36.476991][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 36.482335][ T12] __device_attach+0x217/0x360 [ 36.487084][ T12] ? device_bind_driver+0xd0/0xd0 [ 36.492091][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 36.497357][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 36.502714][ T12] bus_probe_device+0x1e4/0x290 [ 36.507544][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 36.513422][ T12] device_add+0xae6/0x16f0 [ 36.517813][ T12] ? uevent_store+0x50/0x50 [ 36.522290][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 36.528068][ T12] usb_set_configuration+0xdf6/0x1670 [ 36.533413][ T12] generic_probe+0x9d/0xd5 [ 36.537813][ T12] usb_probe_device+0x99/0x100 [ 36.542547][ T12] ? usb_suspend+0x620/0x620 [ 36.547108][ T12] really_probe+0x281/0x6d0 [ 36.552027][ T12] driver_probe_device+0x101/0x1b0 [ 36.557107][ T12] __device_attach_driver+0x1c2/0x220 [ 36.562448][ T12] ? driver_allows_async_probing+0x160/0x160 [ 36.568411][ T12] bus_for_each_drv+0x162/0x1e0 [ 36.573232][ T12] ? bus_rescan_devices+0x20/0x20 [ 36.578241][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 36.584039][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 36.589295][ T12] __device_attach+0x217/0x360 [ 36.594029][ T12] ? device_bind_driver+0xd0/0xd0 [ 36.599123][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 36.604380][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 36.609649][ T12] bus_probe_device+0x1e4/0x290 [ 36.614470][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 36.620333][ T12] device_add+0xae6/0x16f0 [ 36.624734][ T12] ? uevent_store+0x50/0x50 [ 36.629210][ T12] usb_new_device.cold+0x6a4/0xe79 [ 36.634303][ T12] hub_event+0x1b5c/0x3640 [ 36.638689][ T12] ? hub_port_debounce+0x260/0x260 [ 36.643772][ T12] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 36.649290][ T12] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 36.654549][ T12] process_one_work+0x92b/0x1530 [ 36.659460][ T12] ? pwq_dec_nr_in_flight+0x310/0x310 [ 36.664812][ T12] ? do_raw_spin_lock+0x11a/0x280 [ 36.669818][ T12] worker_thread+0x96/0xe20 [ 36.674293][ T12] ? process_one_work+0x1530/0x1530 [ 36.679473][ T12] kthread+0x318/0x420 [ 36.683516][ T12] ? kthread_create_on_node+0xf0/0xf0 [ 36.688871][ T12] ret_from_fork+0x24/0x30 [ 36.69