Question about buildroot vs aplay/arecord with -d

9 Oct 2020


      Hi ALSA ML
I'm now using buildroot, and want to use
aplay/arecord in the same time with -d option.
This works for me
aplay -d 3 xxx
And this works for me, too
arecord -d 3 yyy
But, this doesn't work, and system will hung up
aplay   -d 3 xxx &
    arecord -d 3 yyy
Sometimes it will indicates this message
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
    rcu:     0-....: (1 GPs behind) idle=496/0/0x1 softirq=228/228 fqs=2172
    (detected by 1, t=6502 jiffies, g=-103, q=17)
    Task dump for CPU 0:
    task:swapper/0       state:R  running task     stack:    0 pid:    0 ppid:     0 flags:0x0000002a
    Call trace:
     __switch_to+0x144/0x1a0
     init_task+0x0/0x1780
     ...
Do you know why this happen ?
Thank you for your help !!
Best regards
---
Kuninori Morimoto