rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2645 jiffies s: 825 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):

Sending NMI from CPU 0 to CPUs 1:
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 1
CPU: 1 PID: 3645 Comm: kworker/1:2 Not tainted 6.1.0-rc1-syzkaller-00454-ga70385240892 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: usb_hub_wq hub_event
RIP: 0010:io_serial_out+0x79/0xb0 drivers/tty/serial/8250/8250_port.c:467
Code: fc 89 e9 41 d3 e7 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f1 07 25 fd 44 03 3b 44 89 f0 44 89 fa ee <5b> 41 5c 41 5e 41 5f 5d c3 89 e9 80 e1 07 38 c1 7c ab 48 89 ef e8
RSP: 0018:ffffc900001dff50 EFLAGS: 00000002
RAX: 0000000000000033 RBX: ffffffff91b57980 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff84b970b6 R09: ffffed1003c34047
R10: ffffed1003c34047 R11: 1ffff11003c34046 R12: dffffc0000000000
R13: ffffffff91811c09 R14: 0000000000000033 R15: 00000000000003f8
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc0a53e3160 CR3: 000000000ca8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 serial8250_console_write+0x1510/0x1b00 drivers/tty/serial/8250/8250_port.c:3433
 call_console_driver kernel/printk/printk.c:1942 [inline]
 console_emit_next_record+0x7a4/0xa60 kernel/printk/printk.c:2731
 console_unlock+0x27c/0x6f0 kernel/printk/printk.c:2860
 vprintk_emit+0xd1/0x1e0 kernel/printk/printk.c:2268
 dev_vprintk_emit+0x2e4/0x35d drivers/base/core.c:4736
 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4747
 _dev_warn+0x12f/0x176 drivers/base/core.c:4803
 usb_rx_callback_intf0+0x152/0x190 drivers/media/rc/imon.c:1771
 __usb_hcd_giveback_urb+0x369/0x530 drivers/usb/core/hcd.c:1671
 dummy_timer+0x86b/0x3110 drivers/usb/gadget/udc/dummy_hcd.c:1988
 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers+0x76a/0x980 kernel/time/timer.c:1790
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
 __do_softirq+0x277/0x75b kernel/softirq.c:571
 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1107
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:console_emit_next_record+0x8b6/0xa60 kernel/printk/printk.c:2740
Code: 10 80 1c 00 48 8b 44 24 48 42 80 3c 20 00 44 8a 6c 24 17 4c 8b 74 24 28 48 8b 5c 24 38 74 08 4c 89 f7 e8 7d 53 71 00 49 ff 06 <48> c7 84 24 80 00 00 00 0e 36 e0 45 49 c7 04 1c 00 00 00 00 49 c7
RSP: 0018:ffffc90003ebe380 EFLAGS: 00000293
RAX: ffffffff816d2528 RBX: 1ffff920007d7c80 RCX: ffff88807eafd7c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003ebe5b0 R08: ffffffff816d24ff R09: fffffbfff1c4f03e
R10: fffffbfff1c4f03e R11: 1ffffffff1c4f03d R12: dffffc0000000000
R13: 0000000000000201 R14: 0000000000000046 R15: 0000000000000200
 console_unlock+0x27c/0x6f0 kernel/printk/printk.c:2860
 vprintk_emit+0xd1/0x1e0 kernel/printk/printk.c:2268
 dev_vprintk_emit+0x2e4/0x35d drivers/base/core.c:4736
 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4747
 _dev_info+0x12f/0x176 drivers/base/core.c:4805
 imon_probe+0xe1d/0x3350 drivers/media/rc/imon.c:2474
 usb_probe_interface+0x66e/0xb60 drivers/usb/core/driver.c:396
 call_driver_probe+0x96/0x250
 really_probe+0x24c/0x9f0 drivers/base/dd.c:639
 __driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:778
 driver_probe_device+0x50/0x240 drivers/base/dd.c:808
 __device_attach_driver+0x272/0x3c0 drivers/base/dd.c:936
 bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427
 __device_attach+0x372/0x5a0 drivers/base/dd.c:1008
 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487
 device_add+0xb20/0xf90 drivers/base/core.c:3517
 usb_set_configuration+0x1a5f/0x20e0 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0x83/0x140 drivers/usb/core/generic.c:238
 usb_probe_device+0x131/0x260 drivers/usb/core/driver.c:293
 call_driver_probe+0x96/0x250
 really_probe+0x24c/0x9f0 drivers/base/dd.c:639
 __driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:778
 driver_probe_device+0x50/0x240 drivers/base/dd.c:808
 __device_attach_driver+0x272/0x3c0 drivers/base/dd.c:936
 bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427
 __device_attach+0x372/0x5a0 drivers/base/dd.c:1008
 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:487
 device_add+0xb20/0xf90 drivers/base/core.c:3517
 usb_new_device+0xbc2/0x18b0 drivers/usb/core/hub.c:2573
 hub_port_connect+0x103b/0x2910 drivers/usb/core/hub.c:5353
 hub_port_connect_change+0x619/0xbe0 drivers/usb/core/hub.c:5497
 port_event+0xec6/0x13b0 drivers/usb/core/hub.c:5653
 hub_event+0x5c1/0xd80 drivers/usb/core/hub.c:5735
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 process_scheduled_works kernel/workqueue.c:2352 [inline]
 worker_thread+0xe16/0x1330 kernel/workqueue.c:2438
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 3.812 msecs
imon 3-1:0.0: 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 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 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 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 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 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 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 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 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 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 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 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 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 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: USB disconnect, device number 5
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 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 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 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 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: new high-speed USB device number 6 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 16
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x8B has an invalid bInterval 160, changing to 11
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x8B has invalid maxpacket 42304, setting to 1024
usb 1-1: New USB device found, idVendor=15c2, idProduct=0040, bcdDevice=80.f3
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: SerialNumber: syz
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: config 0 descriptor??
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
input: iMON Panel, Knob and Mouse(15c2:0040) as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/input/input51
rc_core: IR keymap rc-imon-pad not found
Registered IR keymap rc-empty
imon 1-1:0.0: Looks like you're trying to use an IR protocol this device does not support
imon 1-1:0.0: Unsupported IR protocol specified, overriding to iMON IR protocol
rc rc0: iMON Remote (15c2:0040) as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/rc/rc0
input: iMON Remote (15c2:0040) as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/rc/rc0/input55
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: iMON device (15c2:0040, intf0) on usb<1:6> initialized
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: USB disconnect, device number 6
imon 1-1:0.0: 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 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 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 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 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 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 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 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 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: new high-speed USB device number 7 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 16
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x8B has an invalid bInterval 160, changing to 11
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x8B has invalid maxpacket 42304, setting to 1024
usb 1-1: New USB device found, idVendor=15c2, idProduct=0040, bcdDevice=80.f3
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
usb 1-1: config 0 descriptor??
input: iMON Panel, Knob and Mouse(15c2:0040) as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/input/input67
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
rc_core: IR keymap rc-imon-pad not found
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 6-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
Registered IR keymap rc-empty
imon 1-1:0.0: Looks like you're trying to use an IR protocol this device does not support
imon 1-1:0.0: Unsupported IR protocol specified, overriding to iMON IR protocol
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 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
rc rc4: iMON Remote (15c2:0040) as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/rc/rc4
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
input: iMON Remote (15c2:0040) as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/rc/rc4/input70
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 1-1:0.0: 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
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: iMON device (15c2:0040, intf0) on usb<1:7> initialized
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
usb 1-1: USB disconnect, device number 7
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 1-1: new high-speed USB device number 8 using dummy_hcd
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored