dmesg_a311d

[  255.093478] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[  255.093760] rcu: 	5-...0: (9 ticks this GP) idle=4b6/1/0x4000000000000000 softirq=2805/2806 fqs=2626 
[  255.102901] 	(detected by 2, t=5254 jiffies, g=2133, q=96)
[  255.108334] Task dump for CPU 5:
[  255.111525] task:minicom         state:R  running task     stack:    0 pid: 2663 ppid:  2639 flags:0x00000002
[  255.121358] Call trace:
[  255.123772]  __switch_to+0x148/0x1c0
[  255.127309]  resched_curr+0x4c/0x90
[  255.130758]  check_preempt_curr+0x4c/0x84
[  255.134726]  meson_uart_set_termios+0x104/0x230
[  255.139210]  uart_change_speed+0x40/0x160
[  255.143178]  uart_set_termios+0x78/0x160
[  255.147059]  tty_set_termios+0x170/0x214
[  255.150941]  set_termios.part.0+0x158/0x500
[  255.155080]  tty_mode_ioctl+0x36c/0xa20
[  255.158876]  n_tty_ioctl_helper+0x38/0x1f0
[  255.162929]  n_tty_ioctl+0x3c/0x200
[  255.166379]  tty_ioctl+0x2a8/0xcfc
[  255.169743]  __arm64_sys_ioctl+0xb8/0xe0
[  255.173624]  invoke_syscall+0x48/0x114
[  255.177333]  el0_svc_common+0x48/0x17c
[  255.181042]  do_el0_svc+0x28/0x90
[  255.184319]  el0_svc+0x2c/0x54
[  255.187338]  el0t_64_sync_handler+0xa4/0x130
[  255.191564]  el0t_64_sync+0x198/0x19c