On 2021/8/23 14:48, Zhu Yanjun wrote: > Can you reproduce this problem on Ubuntu 20.04? Hi Yanjun, I cannot reproduce this issue on Ubuntu 20.04 vm for now. I think I didn't hit the condition where q->index gets the random value after kmalloc(). Perhaps only when allocating the memory which has been used and freed before. Best Regards, Xiao Yang > Thanks, > Zhu Yanjun