INFO: rcu_preempt detected stalls on CPUs/tasks

lihengsheng123

网上找了个例程，pl通过dma写数据给ddr,然后ps部分通过mmap读ddr里的数据，跑起来一会儿，就ping不通了。。。。


串口信息：

vma start=0x994b7000, size=16384.
enter axi_dma_open
enter axi_dma_open
enter axi_dma_mmap
base start=0x3f100000,
vma start=0x994b3000, size=16384.
INFO: rcu_preempt detected stalls on CPUs/tasks:
        0-...: (1 GPs behind) idle=fba/140000000000001/0 softirq=33718/33722 fqs                                                                                                =3000
        (detected by 1, t=6002 jiffies, g=19737, c=19736, q=115212)
Sending NMI from CPU 1 to CPUs 0:

ps read data from fifo is over! irq=46





** 5 printk messages dropped ** base start=0x3f100000,
** 9 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 9 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 9 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 9 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap
** 9 printk messages dropped ** enter axi_dma_mmap
** 5 printk messages dropped ** base start=0x3f100000,
** 8 printk messages dropped ** enter axi_dma_mmap






求解答，谢谢！！！