rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
 0-....
 } 2690 jiffies s: 8017 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):

Sending NMI from CPU 1 to CPUs 0:
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 PID: 1114 Comm: kworker/0:2 Not tainted 6.4.0-syzkaller-00082-gc0a572d9d32f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: usb_hub_wq hub_event
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:476
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 18 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 e8 85 9c 4e fd eb a4 e8 de 9c 4e fd eb e1 66
RSP: 0018:ffffc900000074d0 EFLAGS: 00000002
RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff84888005 RDI: ffffffff920c8140
RBP: ffffffff920c8100 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 205d353330355420 R12: 0000000000000000
R13: 000000000000005b R14: ffffffff84887fa0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39a8111fa0 CR3: 000000000c571000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_out drivers/tty/serial/8250/8250.h:123 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3388 [inline]
 serial8250_console_write+0xd12/0x1010 drivers/tty/serial/8250/8250_port.c:3459
 console_emit_next_record kernel/printk/printk.c:2877 [inline]
 console_flush_all+0x49c/0xcc0 kernel/printk/printk.c:2933
 console_unlock+0xb8/0x1f0 kernel/printk/printk.c:3007
 vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2307
 dev_vprintk_emit drivers/base/core.c:4840 [inline]
 dev_printk_emit+0xda/0x120 drivers/base/core.c:4851
 __dev_printk+0xf8/0x270 drivers/base/core.c:4863
 _dev_warn+0xdc/0x120 drivers/base/core.c:4907
 usb_rx_callback_intf0+0x11b/0x1a0 drivers/media/rc/imon.c:1771
 __usb_hcd_giveback_urb+0x2b6/0x5c0 drivers/usb/core/hcd.c:1671
 usb_hcd_giveback_urb+0x384/0x430 drivers/usb/core/hcd.c:1754
 dummy_timer+0x13b6/0x3400 drivers/usb/gadget/udc/dummy_hcd.c:1988
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:finish_task_switch.isra.0+0x2bf/0xc80 kernel/sched/core.c:5215
Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 60 f8 ff ff e8 1b 13 32 00 fb 65 48 8b 1c 25 c0 b9 03 00 <48> 8d bb e8 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900058aebd0 EFLAGS: 00000202
RAX: 00000000000a1719 RBX: ffff888020f1d940 RCX: 1ffffffff22aab86
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900058aec18 R08: 0000000000000001 R09: ffffffff9152bd6f
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b983c3c0
R13: ffff888020f1bb80 R14: 0000000000000000 R15: ffff8880b983cdf8
 context_switch kernel/sched/core.c:5346 [inline]
 __schedule+0xca2/0x5880 kernel/sched/core.c:6669
 preempt_schedule_common+0x45/0xb0 kernel/sched/core.c:6838
 preempt_schedule_thunk+0x1a/0x20 arch/x86/entry/thunk_64.S:34
 vprintk_emit+0x1ee/0x600 kernel/printk/printk.c:2308
 dev_vprintk_emit drivers/base/core.c:4840 [inline]
 dev_printk_emit+0xda/0x120 drivers/base/core.c:4851
 __dev_printk+0xf8/0x270 drivers/base/core.c:4863
 _dev_info+0xdc/0x120 drivers/base/core.c:4909
 imon_probe+0x7f2/0x3630 drivers/media/rc/imon.c:2474
 usb_probe_interface+0x30f/0x960 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x240/0xca0 drivers/base/dd.c:658
 __driver_probe_device+0x1df/0x4b0 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:958
 bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
 device_add+0x112d/0x1a40 drivers/base/core.c:3625
 usb_set_configuration+0x1196/0x1bc0 drivers/usb/core/message.c:2211
 usb_generic_driver_probe+0xcf/0x130 drivers/usb/core/generic.c:238
 usb_probe_device+0xd8/0x2c0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x240/0xca0 drivers/base/dd.c:658
 __driver_probe_device+0x1df/0x4b0 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:958
 bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
 device_add+0x112d/0x1a40 drivers/base/core.c:3625
 usb_new_device+0xcb2/0x19d0 drivers/usb/core/hub.c:2575
 hub_port_connect drivers/usb/core/hub.c:5407 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5551 [inline]
 port_event drivers/usb/core/hub.c:5711 [inline]
 hub_event+0x2d9e/0x4e40 drivers/usb/core/hub.c:5793
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2408
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2555
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 3.107 msecs
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 3-1: USB disconnect, device number 27
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 3-1: new high-speed USB device number 28 using dummy_hcd
usb 3-1: Using ep0 maxpacket: 16
usb 3-1: config 0 interface 0 altsetting 0 endpoint 0x8B has an invalid bInterval 0, changing to 7
usb 3-1: New USB device found, idVendor=15c2, idProduct=0040, bcdDevice= 7.f3
usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-1: Product: syz
usb 3-1: Manufacturer: syz
usb 3-1: SerialNumber: syz
usb 3-1: config 0 descriptor??
input: iMON Panel, Knob and Mouse(15c2:0040) as /devices/platform/dummy_hcd.2/usb3/3-1/3-1:0.0/input/input311
rc_core: IR keymap rc-imon-pad not found
Registered IR keymap rc-empty
imon 3-1:0.0: Looks like you're trying to use an IR protocol this device does not support
imon 3-1:0.0: Unsupported IR protocol specified, overriding to iMON IR protocol