[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. [....] Starting OpenBSD Secure Shell server: sshd[ 15.148395][ T1669] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.432481][ C1] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.219' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 60.289161][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 60.649280][ T12] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 60.660420][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 0 [ 60.670345][ T12] usb 1-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 0 [ 60.839241][ T12] usb 1-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 [ 60.848289][ T12] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 60.856355][ T12] usb 1-1: Product: syz [ 60.860888][ T12] usb 1-1: Manufacturer: syz [ 60.865469][ T12] usb 1-1: SerialNumber: syz [ 62.009245][ T12] cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 [ 62.015831][ T12] cdc_ncm 1-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 [ 62.023257][ T12] cdc_ncm 1-1:1.0: setting rx_max = 2048 tun: can't open /dev/net/tun: please enable CONFIG_TUN=y otherwise fuzzing or reproducing might not work as intended [ 62.219216][ T12] cdc_ncm 1-1:1.0: setting tx_max = 16384 [ 62.224961][ T12] divide error: 0000 [#1] SMP KASAN [ 62.230139][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc7+ #0 [ 62.237476][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.247536][ T12] Workqueue: usb_hub_wq hub_event [ 62.252538][ T12] RIP: 0010:cdc_ncm_update_rxtx_max+0xc6e/0xef0 [ 62.258752][ 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 29 47 f7 fd 31 d2 44 89 e0 31 ff f3 41 89 d5 89 d6 e8 86 48 f7 fd 45 85 ed 0f 85 17 f7 ff ff e8 [ 62.278345][ T12] RSP: 0018:ffff8881da20f030 EFLAGS: 00010246 [ 62.284385][ T12] RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000001 [ 62.292331][ T12] RDX: 0000000000000000 RSI: ffffffff83469377 RDI: 0000000000000000 [ 62.300362][ T12] RBP: ffff8881c7ba0000 R08: ffff8881da1f9800 R09: ffffed103b645d58 [ 62.308313][ T12] R10: ffffed103b645d57 R11: ffff8881db22eabf R12: 0000000000004000 [ 62.316265][ T12] R13: 0000000000000000 R14: ffff8881d35f3dc0 R15: ffff8881d2a70f00 [ 62.324210][ T12] FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 [ 62.333113][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.339680][ T12] CR2: 00007f1059879000 CR3: 00000001d49db000 CR4: 00000000001406f0 [ 62.347627][ T12] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 62.355583][ T12] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 62.363526][ T12] Call Trace: [ 62.366793][ T12] ? cdc_ncm_select_altsetting+0x1a0/0x1a0 [ 62.372584][ T12] cdc_ncm_bind_common+0x1005/0x2570 [ 62.377854][ T12] ? cdc_ncm_align_tail+0x1b0/0x1b0 [ 62.383026][ T12] ? __debug_object_init+0x47c/0xdd0 [ 62.388285][ T12] ? lockdep_init_map+0x1b0/0x5e0 [ 62.393292][ T12] cdc_ncm_bind+0x7c/0x1c0 [ 62.397682][ T12] ? cdc_ncm_bind_common+0x2570/0x2570 [ 62.403124][ T12] usbnet_probe+0xb43/0x23cf [ 62.407705][ T12] usb_probe_interface+0x305/0x7a0 [ 62.412797][ T12] ? usb_probe_device+0x100/0x100 [ 62.417888][ T12] really_probe+0x281/0x6d0 [ 62.422367][ T12] driver_probe_device+0x101/0x1b0 [ 62.427449][ T12] __device_attach_driver+0x1c2/0x220 [ 62.432793][ T12] ? driver_allows_async_probing+0x160/0x160 [ 62.438758][ T12] bus_for_each_drv+0x162/0x1e0 [ 62.443583][ T12] ? bus_rescan_devices+0x20/0x20 [ 62.448593][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 62.454371][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 62.459628][ T12] __device_attach+0x217/0x360 [ 62.464377][ T12] ? device_bind_driver+0xd0/0xd0 [ 62.469385][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 62.474641][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 62.479907][ T12] bus_probe_device+0x1e4/0x290 [ 62.484731][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 62.490596][ T12] device_add+0xae6/0x16f0 [ 62.494986][ T12] ? uevent_store+0x50/0x50 [ 62.499465][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 62.505243][ T12] usb_set_configuration+0xdf6/0x1670 [ 62.510591][ T12] generic_probe+0x9d/0xd5 [ 62.514980][ T12] usb_probe_device+0x99/0x100 [ 62.519715][ T12] ? usb_suspend+0x620/0x620 [ 62.524278][ T12] really_probe+0x281/0x6d0 [ 62.528753][ T12] driver_probe_device+0x101/0x1b0 [ 62.533837][ T12] __device_attach_driver+0x1c2/0x220 [ 62.539181][ T12] ? driver_allows_async_probing+0x160/0x160 [ 62.545234][ T12] bus_for_each_drv+0x162/0x1e0 [ 62.550072][ T12] ? bus_rescan_devices+0x20/0x20 [ 62.555069][ T12] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 62.560847][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 62.566117][ T12] __device_attach+0x217/0x360 [ 62.570857][ T12] ? device_bind_driver+0xd0/0xd0 [ 62.575954][ T12] ? kobject_uevent_env+0x29e/0x1150 [ 62.581220][ T12] ? kobject_uevent_env+0x2a8/0x1150 [ 62.586476][ T12] bus_probe_device+0x1e4/0x290 [ 62.591311][ T12] ? blocking_notifier_call_chain+0x54/0xa0 [ 62.597186][ T12] device_add+0xae6/0x16f0 [ 62.601575][ T12] ? uevent_store+0x50/0x50 [ 62.606052][ T12] usb_new_device.cold+0x6a4/0xe79 [ 62.611136][ T12] hub_event+0x1b5c/0x3640 [ 62.615523][ T12] ? hub_port_debounce+0x260/0x260 [ 62.620608][ T12] process_one_work+0x92b/0x1530 [ 62.625531][ T12] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.630874][ T12] ? do_raw_spin_lock+0x11a/0x280 [ 62.635882][ T12] worker_thread+0x96/0xe20 [ 62.640359][ T12] ? process_one_work+0x1530/0x1530 [ 62.645536][ T12] kthread+0x318/0x420 [ 62.649576][ T12] ? kthread_create_on_node+0xf0/0xf0 [ 62.654928][ T12] ret_from_fork+0x24/0x30 [ 62.659311][ T12] Modules linked in: [ 62.663375][ T12] ---[ end trace ab75cc10e099d8e9 ]--- [ 62.668846][ T12] RIP: