On 2022-03-06 18:17:54 [+0800], Yunhao Tian wrote: > Hi everyone, Hi, > I'm using Linux 5.15.24-rt31 kernel with PREEMPT_RT enabled, on my > RK3308 board. I set up f_rndis gadget with the following script, and > plugged my board to a x86 Linux computer running 5.15.25 kernel: Is this 5.15.24-rt31 as-is or are there other patches involved? What UDC is used here? … > [ 25.993834] NOHZ tick-stop error: Non-RCU local softirq work is > pending, handler #80!!! that is sched … > [ 25.995885] NOHZ tick-stop error: Non-RCU local softirq work is > pending, handler #180!!! that is additionally hrtimer. I did touch hrtimer but I did not yet touch sched so I account myself as 50% innocent. You don't have by chance change the thread affinity of tasks/ interrupt threads? The SoC has 4 cores if I see this right. > If I turn off PREEMPT_RT, there won't be any errors while downloading. > > I believe this problem is not tied to any specific board, and anyone > can reproduce this problem using a Raspberry Pi (Although I didn't try > because I don't have one). I would like to ask for assistance > regarding this problem. Let me try dummy_udc… Sebastian
