radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 4-1:0.0: non-zero urb status (-71) radio-si470x 3-1:0.0: non-zero urb status (-71) rcu: INFO: rcu_sched self-detected stall on CPU rcu: 1-...!: (8177 ticks this GP) idle=78e/1/0x4000000000000004 softirq=3439/3439 fqs=0 (t=10502 jiffies g=2653 q=23) rcu: rcu_sched kthread starved for 10504 jiffies! g2653 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_sched R running task 29744 10 2 0x80004000 Call Trace: schedule+0xca/0x250 kernel/sched/core.c:4136 schedule_timeout+0x440/0xb20 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1639 [inline] rcu_gp_kthread+0xaff/0x29e0 kernel/rcu/tree.c:1799 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 1737 Comm: kworker/1:3 Not tainted 5.4.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xca/0x13e lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x169/0x1b3 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2795 [inline] rcu_sched_clock_irq.cold+0x4da/0x936 kernel/rcu/tree.c:2244 update_process_times+0x25/0x60 kernel/time/timer.c:1726 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:167 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1299 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x303/0xc60 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x2e8/0x730 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xf5/0x500 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x40/0x50 kernel/locking/spinlock.c:191 Code: e8 95 14 b3 fb 48 89 ef e8 6d f3 b3 fb f6 c7 02 75 11 53 9d e8 61 ba d0 fb 65 ff 0d a2 67 8f 7a 5b 5d c3 e8 02 be d0 fb 53 9d ed 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 fd 65 ff RSP: 0018:ffff8881db309b08 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000206 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881d065084c RBP: ffff8881d50f4000 R08: ffff8881d0650000 R09: fffffbfff11b23b8 R10: fffffbfff11b23b7 R11: ffffffff88d91dbf R12: 0000000000000080 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8881d46bcd00 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] dummy_timer+0x131b/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1980 call_timer_fn+0x179/0x650 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x5e3/0x1490 kernel/time/timer.c:1786 __do_softirq+0x221/0x912 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x178/0x1a0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline] RIP: 0010:console_unlock+0xb4f/0xc40 kernel/printk/printk.c:2477 Code: 32 fe ff ff e8 a2 ae 15 00 48 8b bc 24 80 00 00 00 e8 b5 dd ff ff e9 29 fb ff ff e8 8b ae 15 00 e8 06 db 1a 00 ff 74 24 30 9d 15 fb ff ff e8 67 f0 3c 00 e9 de f6 ff ff e8 6d f0 3c 00 e9 98 RSP: 0018:ffff8881c06beda0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000200 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffff8881d06508f0 RDI: ffff8881d065084c RBP: 0000000000000001 R08: ffff8881d0650000 R09: fffffbfff11b23ae R10: fffffbfff11b23ad R11: ffffffff88d91d6f R12: 0000000000000047 R13: dffffc0000000000 R14: ffffffff8293f390 R15: ffffffff87077070 vprintk_emit+0x171/0x3e0 kernel/printk/printk.c:1996 dev_vprintk_emit+0x4fc/0x541 drivers/base/core.c:3312 dev_printk_emit+0xba/0xf1 drivers/base/core.c:3323 __dev_printk+0x1db/0x203 drivers/base/core.c:3335 _dev_warn+0xd7/0x109 drivers/base/core.c:3379 si470x_set_report.isra.0.constprop.0.cold+0x32/0x41 drivers/media/radio/si470x/radio-si470x-usb.c:234 si470x_set_register+0x11c/0x180 drivers/media/radio/si470x/radio-si470x-usb.c:269 si470x_start+0x72/0x2bf drivers/media/radio/si470x/radio-si470x-common.c:374 si470x_start_usb+0x507/0x53d drivers/media/radio/si470x/radio-si470x-usb.c:549 si470x_usb_driver_probe.cold+0x6e5/0x8b2 drivers/media/radio/si470x/radio-si470x-usb.c:737 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5183 [inline] hub_port_connect_change drivers/usb/core/hub.c:5323 [inline] port_event drivers/usb/core/hub.c:5469 [inline] hub_event+0x1dd0/0x37e0 drivers/usb/core/hub.c:5551 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 4-1:0.0: non-zero urb status (-71) radio-si470x 3-1:0.0: non-zero urb status (-71) radio-si470x 4-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 3-1:0.0: non-zero urb status (-71) radio-si470x 3-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 4-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 3-1:0.0: non-zero urb status (-71) radio-si470x 4-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 6-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 6-1:0.0: non-zero urb status (-71) radio-si470x 1-1:0.0: non-zero urb status (-71) radio-si470x 6-1:0.0: non-zero urb status (-71) radio-si470x 2-1:0.0: non-zero urb status (-71) radio-si470x 5-1:0.0: non-zero urb status (-71) radio-si470x 5-1:0.0: non-zero urb status (-71) radio-si470x 2-1:0.0: non-zero urb status (-71) radio-si470x 5-1:0.0: non-zero urb status (-71) radio-si470x 5-1:0.0: non-zero urb status (-71) radio-si470x 2-1:0.0: non-zero urb status (-71) radio-si470x 5-1:0.0: non-zero urb status (-71) radio-si470x 2-1:0.0: non-zero urb status (-71) radio-si470x 5-1:0.0: non-zero urb status (-71) radio-si470x 2-1:0.0: non-zero urb status (-71) radio-si470x 4-1:0.0: non-zero urb status (-71) radio-si470x 6-1:0.0: non-zero urb status (-71) radio-si470x 6-1:0.0: non-zero urb status (-71)