rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2634 jiffies s: 3149 root: 0x2/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 0 to CPUs 1: imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored NMI backtrace for cpu 1 CPU: 1 PID: 2520 Comm: kworker/1:2 Not tainted 6.8.0-rc6-syzkaller-gd206a76d7d27 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:410 Code: 00 a4 67 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 01 c8 c9 fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c RSP: 0018:ffffc900001eff78 EFLAGS: 00000002 RAX: 1ffffffff28f6500 RBX: ffffffff947b2980 RCX: 0000000000000000 RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020 RBP: 0000000000000000 R08: ffffffff852bc946 R09: 1ffff11003fce046 R10: dffffc0000000000 R11: ffffffff852bc900 R12: dffffc0000000000 R13: 00000000000026f8 R14: 00000000000003fd R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564a338ab058 CR3: 000000000df32000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_in drivers/tty/serial/8250/8250.h:117 [inline] serial_lsr_in drivers/tty/serial/8250/8250.h:139 [inline] wait_for_lsr drivers/tty/serial/8250/8250_port.c:2081 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3366 [inline] serial8250_console_write+0x110d/0x1840 drivers/tty/serial/8250/8250_port.c:3444 console_emit_next_record kernel/printk/printk.c:2901 [inline] console_flush_all+0x808/0xec0 kernel/printk/printk.c:2967 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036 vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4864 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4875 _dev_warn+0x122/0x170 drivers/base/core.c:4931 usb_rx_callback_intf0+0x15a/0x1a0 drivers/media/rc/imon.c:1771 __usb_hcd_giveback_urb+0x373/0x530 drivers/usb/core/hcd.c:1650 dummy_timer+0x8aa/0x3220 drivers/usb/gadget/udc/dummy_hcd.c:1987 call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x621/0x830 kernel/time/timer.c:2038 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051 __do_softirq+0x2bb/0x942 kernel/softirq.c:553 do_softirq+0x11b/0x1e0 kernel/softirq.c:454 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:381 spin_unlock_bh include/linux/spinlock.h:396 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 4-1:0.0: 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 4-1:0.0: 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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