[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[ 14.787094][ C1] random: crng init done [?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.76' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 263.381527][ T95] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 263.471692][ T95] usb 1-1: Using ep0 maxpacket: 16 [ 263.591998][ T95] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 263.603290][ T95] usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 [ 263.616146][ T95] usb 1-1: New USB device found, idVendor=045e, idProduct=07da, bcdDevice= 0.00 [ 263.625250][ T95] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 263.638922][ T95] usb 1-1: config 0 descriptor?? [ 369.131324][ C0] rcu: INFO: rcu_sched self-detected stall on CPU [ 369.137843][ C0] rcu: 0-....: (10499 ticks this GP) idle=d02/1/0x4000000000000002 softirq=2696/2696 fqs=5195 [ 369.148357][ C0] (t=10500 jiffies g=1449 q=28) [ 369.153283][ C0] NMI backtrace for cpu 0 [ 369.157595][ C0] CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.6.0-rc3-syzkaller #0 [ 369.165734][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 369.175959][ C0] Workqueue: usb_hub_wq hub_event [ 369.180973][ C0] Call Trace: [ 369.184239][ C0] [ 369.187085][ C0] dump_stack+0xef/0x16e [ 369.191307][ C0] ? irq_force_complete_move.cold+0x43/0x47 [ 369.197179][ C0] nmi_cpu_backtrace.cold+0x70/0xb1 [ 369.202387][ C0] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 369.208018][ C0] nmi_trigger_cpumask_backtrace+0x1db/0x207 [ 369.213984][ C0] rcu_dump_cpu_stacks+0x169/0x1b3 [ 369.219085][ C0] rcu_sched_clock_irq.cold+0x4da/0x901 [ 369.224621][ C0] ? trace_hardirqs_off+0x50/0x200 [ 369.230065][ C0] update_process_times+0x25/0x60 [ 369.235076][ C0] tick_sched_handle+0x9b/0x180 [ 369.239905][ C0] tick_sched_timer+0x42/0x130 [ 369.244657][ C0] __hrtimer_run_queues+0x32c/0xd20 [ 369.249845][ C0] ? tick_sched_do_timer+0x1a0/0x1a0 [ 369.255107][ C0] ? hrtimer_init+0x2e0/0x2e0 [ 369.260295][ C0] ? ktime_get_update_offsets_now+0x24c/0x320 [ 369.266351][ C0] hrtimer_interrupt+0x2e8/0x730 [ 369.271271][ C0] smp_apic_timer_interrupt+0xfe/0x540 [ 369.276708][ C0] apic_timer_interrupt+0xf/0x20 [ 369.281661][ C0] [ 369.284595][ C0] RIP: 0010:write_comp_data+0x1e/0x70 [ 369.289961][ C0] Code: 48 89 11 c3 0f 1f 84 00 00 00 00 00 65 4c 8b 04 25 00 0f 02 00 65 8b 05 78 b1 c2 7e a9 00 01 1f 00 75 51 41 8b 80 b0 12 00 00 <83> f8 03 75 45 49 8b 80 b8 12 00 00 45 8b 80 b4 12 00 00 4c 8b 08 [ 369.309559][ C0] RSP: 0018:ffff8881d5be6c88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 369.317961][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff846d24ac [ 369.325910][ C0] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000005 [ 369.333858][ C0] RBP: ffff8881d97e6400 R08: ffff8881d8994980 R09: ffffc9000046f0cc [ 369.341894][ C0] R10: fffff5200009141b R11: ffffc9000048a0db R12: ffff8881c5680000 [ 369.349845][ C0] R13: 0000000000000000 R14: ffff8881d97e6400 R15: dffffc0000000000 [ 369.357805][ C0] ? hid_setup_resolution_multiplier+0x34c/0x990 [ 369.364113][ C0] hid_setup_resolution_multiplier+0x34c/0x990 [ 369.370243][ C0] hid_open_report+0x438/0x640 [ 369.374995][ C0] ? hid_parser_global+0x1440/0x1440 [ 369.380269][ C0] ? add_dr+0xb4/0x190 [ 369.384316][ C0] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 369.390098][ C0] ms_probe+0x12d/0x4d0 [ 369.394231][ C0] ? ms_remove+0x90/0x90 [ 369.398459][ C0] hid_device_probe+0x2be/0x3f0 [ 369.403390][ C0] ? hid_match_device+0x1f0/0x1f0 [ 369.408396][ C0] really_probe+0x290/0xac0 [ 369.412881][ C0] driver_probe_device+0x223/0x350 [ 369.417988][ C0] __device_attach_driver+0x1d1/0x290 [ 369.423356][ C0] ? driver_allows_async_probing+0x160/0x160 [ 369.429324][ C0] bus_for_each_drv+0x162/0x1e0 [ 369.434154][ C0] ? bus_rescan_devices+0x20/0x20 [ 369.439160][ C0] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 369.444959][ C0] ? lockdep_hardirqs_on+0x382/0x580 [ 369.450218][ C0] __device_attach+0x217/0x390 [ 369.454959][ C0] ? device_bind_driver+0xd0/0xd0 [ 369.460048][ C0] bus_probe_device+0x1e4/0x290 [ 369.464885][ C0] device_add+0x1459/0x1bf0 [ 369.469377][ C0] ? device_link_remove+0x110/0x110 [ 369.474553][ C0] ? __debugfs_create_file+0x301/0x3f0 [ 369.480006][ C0] hid_add_device+0x33c/0x9a0 [ 369.484663][ C0] ? debug_object_fixup+0x30/0x30 [ 369.489678][ C0] ? __hid_bus_reprobe_drivers+0x130/0x130 [ 369.495490][ C0] ? lockdep_init_map+0x1b0/0x5e0 [ 369.500685][ C0] usbhid_probe+0xa81/0xfa0 [ 369.505177][ C0] usb_probe_interface+0x310/0x800 [ 369.510264][ C0] ? usb_probe_device+0x230/0x230 [ 369.515265][ C0] really_probe+0x290/0xac0 [ 369.519747][ C0] driver_probe_device+0x223/0x350 [ 369.524848][ C0] __device_attach_driver+0x1d1/0x290 [ 369.530210][ C0] ? driver_allows_async_probing+0x160/0x160 [ 369.536169][ C0] bus_for_each_drv+0x162/0x1e0 [ 369.541000][ C0] ? bus_rescan_devices+0x20/0x20 [ 369.546000][ C0] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 369.551793][ C0] ? lockdep_hardirqs_on+0x382/0x580 [ 369.557079][ C0] __device_attach+0x217/0x390 [ 369.561866][ C0] ? device_bind_driver+0xd0/0xd0 [ 369.566884][ C0] bus_probe_device+0x1e4/0x290 [ 369.571742][ C0] device_add+0x1459/0x1bf0 [ 369.576240][ C0] ? wait_for_completion+0x3c0/0x3c0 [ 369.581516][ C0] ? device_link_remove+0x110/0x110 [ 369.586779][ C0] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 369.592578][ C0] usb_set_configuration+0xe47/0x17d0 [ 369.597930][ C0] usb_generic_driver_probe+0x9d/0xe0 [ 369.603294][ C0] usb_probe_device+0xd9/0x230 [ 369.608038][ C0] ? usb_suspend+0x5f0/0x5f0 [ 369.612629][ C0] really_probe+0x290/0xac0 [ 369.617114][ C0] driver_probe_device+0x223/0x350 [ 369.622220][ C0] __device_attach_driver+0x1d1/0x290 [ 369.627581][ C0] ? driver_allows_async_probing+0x160/0x160 [ 369.633569][ C0] bus_for_each_drv+0x162/0x1e0 [ 369.638428][ C0] ? bus_rescan_devices+0x20/0x20 [ 369.643445][ C0] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 369.649230][ C0] ? lockdep_hardirqs_on+0x382/0x580 [ 369.654505][ C0] __device_attach+0x217/0x390 [ 369.659338][ C0] ? device_bind_driver+0xd0/0xd0 [ 369.664349][ C0] bus_probe_device+0x1e4/0x290 [ 369.669178][ C0] device_add+0x1459/0x1bf0 [ 369.673658][ C0] ? device_link_remove+0x110/0x110 [ 369.678852][ C0] usb_new_device.cold+0x540/0xcd0 [ 369.683943][ C0] hub_event+0x21cb/0x4300 [ 369.688341][ C0] ? hub_port_debounce+0x350/0x350 [ 369.693442][ C0] ? find_held_lock+0x2d/0x110 [ 369.698184][ C0] ? mark_held_locks+0xe0/0xe0 [ 369.703024][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 369.708559][ C0] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 369.713838][ C0] process_one_work+0x94b/0x1620 [ 369.718768][ C0] ? pwq_dec_nr_in_flight+0x310/0x310 [ 369.724180][ C0] ? do_raw_spin_lock+0x129/0x290 [ 369.729208][ C0] worker_thread+0x96/0xe20 [ 369.733701][ C0] ? process_one_work+0x1620/0x1620 [ 369.738902][ C0] kthread+0x318/0x420 [ 369.743089][ C0] ? kthread_create_on_node+0xf0/0xf0 [ 369.748447][ C0] ret_from_fork+0x24/0x30 [ 373.361458][ T94] rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 10903 jiffies s: 1121 root: 0x1/. [ 373.373100][ T94] rcu: blocking rcu_node structures: [ 373.378377][ T94] Task dump for CPU 0: [ 373.382475][ T94] kworker/0:2 R running task 24768 95 2 0x80004008 [ 373.390381][ T94] Workqueue: usb_hub_wq hub_event [ 373.395426][ T94] Call Trace: [ 373.398724][ T94] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 373.404214][ T94] ? retint_kernel+0x10/0x10 [ 373.408803][ T94] ? hid_setup_resolution_multiplier+0x30c/0x990 [ 373.415163][ T94] ? __sanitizer_cov_trace_pc+0x9/0x50 [ 373.420617][ T94] ? hid_setup_resolution_multiplier+0x357/0x990 [ 373.426974][ T94] ? hid_open_report+0x438/0x640 [ 373.431942][ T94] ? hid_parser_global+0x1440/0x1440 [ 373.437237][ T94] ? add_dr+0xb4/0x190 [ 373.441419][ T94] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 373.447217][ T94] ? ms_probe+0x12d/0x4d0 [ 373.451570][ T94] ? ms_remove+0x90/0x90 [ 373.455805][ T94] ? hid_device_probe+0x2be/0x3f0 [ 373.460913][ T94] ? hid_match_device+0x1f0/0x1f0 [ 373.466059][ T94] ? really_probe+0x290/0xac0 [ 373.470908][ T94] ? driver_probe_device+0x223/0x350 [ 373.476263][ T94] ? __device_attach_driver+0x1d1/0x290 [ 373.481865][ T94] ? driver_allows_async_probing+0x160/0x160 [ 373.487852][ T94] ? bus_for_each_drv+0x162/0x1e0 [ 373.492907][ T94] ? bus_rescan_devices+0x20/0x20 [ 373.497933][ T94] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 373.503761][ T94] ? lockdep_hardirqs_on+0x382/0x580 [ 373.509040][ T94] ? __device_attach+0x217/0x390 [ 373.513998][ T94] ? device_bind_driver+0xd0/0xd0 [ 373.519021][ T94] ? bus_probe_device+0x1e4/0x290 [ 373.524069][ T94] ? device_add+0x1459/0x1bf0 [ 373.528840][ T94] ? device_link_remove+0x110/0x110 [ 373.534092][ T94] ? __debugfs_create_file+0x301/0x3f0 [ 373.539566][ T94] ? hid_add_device+0x33c/0x9a0 [ 373.544571][ T94] ? debug_object_fixup+0x30/0x30 [ 373.549598][ T94] ? __hid_bus_reprobe_drivers+0x130/0x130 [ 373.555456][ T94] ? lockdep_init_map+0x1b0/0x5e0 [ 373.560482][ T94] ? usbhid_probe+0xa81/0xfa0 [ 373.565196][ T94] ? usb_probe_interface+0x310/0x800 [ 373.570480][ T94] ? usb_probe_device+0x230/0x230 [ 373.575530][ T94] ? really_probe+0x290/0xac0 [ 373.580206][ T94] ? driver_probe_device+0x223/0x350 [ 373.585520][ T94] ? __device_attach_driver+0x1d1/0x290 [ 373.591061][ T94] ? driver_allows_async_probing+0x160/0x160 [ 373.597067][ T94] ? bus_for_each_drv+0x162/0x1e0 [ 373.602112][ T94] ? bus_rescan_devices+0x20/0x20 [ 373.607132][ T94] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 373.612964][ T94] ? lockdep_hardirqs_on+0x382/0x580 [ 373.618253][ T94] ? __device_attach+0x217/0x390 [ 373.623222][ T94] ? device_bind_driver+0xd0/0xd0 [ 373.628249][ T94] ? bus_probe_device+0x1e4/0x290 [ 373.633293][ T94] ? device_add+0x1459/0x1bf0 [ 373.637988][ T94] ? wait_for_completion+0x3c0/0x3c0 [ 373.643298][ T94] ? device_link_remove+0x110/0x110 [ 373.648495][ T94] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 373.654343][ T94] ? usb_set_configuration+0xe47/0x17d0 [ 373.659888][ T94] ? usb_generic_driver_probe+0x9d/0xe0 [ 373.665467][ T94] ? usb_probe_device+0xd9/0x230 [ 373.670433][ T94] ? usb_suspend+0x5f0/0x5f0 [ 373.675072][ T94] ? really_probe+0x290/0xac0 [ 373.679750][ T94] ? driver_probe_device+0x223/0x350 [ 373.685063][ T94] ? __device_attach_driver+0x1d1/0x290 [ 373.690609][ T94] ? driver_allows_async_probing+0x160/0x160 [ 373.696618][ T94] ? bus_for_each_drv+0x162/0x1e0 [ 373.701756][ T94] ? bus_rescan_devices+0x20/0x20 [ 373.708079][ T94] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 373.713924][ T94] ? lockdep_hardirqs_on+0x382/0x580 [ 373.719203][ T94] ? __device_attach+0x217/0x390 [ 373.724157][ T94] ? device_bind_driver+0xd0/0xd0 [ 373.729175][ T94] ? bus_probe_device+0x1e4/0x290 [ 373.734233][ T94] ? device_add+0x1459/0x1bf0 [ 373.738910][ T94] ? device_link_remove+0x110/0x110 [ 373.744136][ T94] ? usb_new_device.cold+0x540/0xcd0 [ 373.749500][ T94] ? hub_event+0x21cb/0x4300 [ 373.754112][ T94] ? hub_port_debounce+0x350/0x350 [ 373.759216][ T94] ? find_held_lock+0x2d/0x110 [ 373.764016][ T94] ? mark_held_locks+0xe0/0xe0 [ 373.768774][ T94] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 373.774340][ T94] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 373.779621][ T94] ? process_one_work+0x94b/0x1620 [ 373.784760][ T94] ? pwq_dec_nr_in_flight+0x310/0x310 [ 373.790128][ T94] ? do_raw_spin_lock+0x129/0x290 [ 373.795179][ T94] ? worker_thread+0x96/0xe20 [ 373.799853][ T94] ? process_one_work+0x1620/0x1620 [ 373.805079][ T94] ? kthread+0x318/0x420 [ 373.809322][ T94] ? kthread_create_on_node+0xf0/0xf0 [ 373.814724][ T94] ? ret_from_fork+0x24/0x30