[dpdk-dev] kernel panic when stop my test demo

[Lilijun]

Hi all,

After adding unmap uio resources operations in process signal handler functions,
An new error was found as follows:
Call Trace:
 [<ffffffffa01cd530>] uio_release+0x40/0x60 [uio]
 [<ffffffff811b1329>] __fput+0xe9/0x270
 [<ffffffff811b15fe>] ____fput+0xe/0x10
 [<ffffffff810823c7>] task_work_run+0xa7/0xe0
 [<ffffffff81012a77>] do_notify_resume+0x97/0xb0
 [<ffffffff815f2a92>] int_signal+0x12/0x17

The code for unmap uio resources is shown:
static void pci_dev_uio_unmap(struct rte_pci_device *pci_dev, uint8_t port_id)
{
        int i;

        RTE_LOG(INFO, EAL, "begin unmap port %d uio resource! \n", port_id);
        if (NULL == pci_dev)
        {
                RTE_LOG(ERR, EAL, "begin unmap port %d uio resource! \n", port_id);
                return;
        }

        for (i = 0; i != PCI_MAX_RESOURCE; i++)
        {
                /* skip empty BAR */
                if (0 == pci_dev->mem_resource[i].phys_addr)
                        continue;
                if (munmap(pci_dev->mem_resource[i].addr, pci_dev->mem_resource[i].len)
                                                                        == -1){
                        RTE_LOG(ERR, EAL, "Error with munmap\n");
                        return;
                }
        }
        if (close(pci_dev->intr_handle.fd) == -1){
                RTE_LOG(ERR, EAL, "Error closing interrupt handle\n");
                return;
        }
        pci_dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
        RTE_LOG(INFO, EAL, "unmap port %d uio resource successfully!\n", port_id);
}

Does anyone has some ideas?

Thanks for any help.
Jerry

On 2014/10/14 19:58, Lilijun wrote:
> Hi Stephen and all,
> 
> I have a same problem as this older email describes on Aug 14, 2013.
> Any help will be appreciated.
> 
> The details is shown as follows.
> The key step implementation of my demo is:
> 1. Firstly, call rte_eal_init() to do some initialization.
> 2. Switch the driver of my Intel  82599 NIC from ixgbe.ko to igb_uio.ko
> like tools/dpdk_nic_bind.py written in C source code.
> 3. Configure rte_dev and start it.
> 4. Do some rx/tx tests.
> 5. call rte_eth_dev_stop(dpdk_port_id) to stop the hardware as your history emails.
> 6. Switch the driver of the NIC from igb_uio.ko to ixgbe.ko.
> 7. Kill the demo using commands: kill -9.
> 
> Then kernel panics at random points when do something later.
> One of them as follows:
> general protection fault: 0000 [#1] SMP
>  Modules linked in: tun igb_uio(OF) uio mlx4_ib ib_sa
> task: ffff881fd0d6a220 ti: ffff881fd0cf8000 task.ti: ffff881fd0cf8000
> RIP: 0010:[<ffffffff8183d85f>]  [<ffffffff8183d85f>] dcbnl_rtnl_policy+0x1b111f/0x1e3f70
> RSP: 0000:ffff881fd0cf9c38  EFLAGS: 00013282
> RAX: ffffffff819770a0 RBX: ffff881fe7b49fa0 RCX: 0000000000000001
> RDX: ffffffff8183d851 RSI: ffff881fe7f20da1 RDI: ffffffff819770a0
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: ffff881fe7f20da0 R11: ffff881fd0da0310 R12: ffff881fe811e6c0
> R13: 0000000000000000 R14: ffff881fe6d14180 R15: ffff881fe7af4a20
> FS:  0000000000000000(0000) GS:ffff88203fc00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00007f2702d3f9e0 CR3: 00000000018ce000 CR4: 00000000000007e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Stack:
>  ffffffffa0235524 ffff881fd0da0300 0000000000000008 ffff881fe7f20da0
>  ffff881fd0cf9ca0 ffffffff811b1329 ffff881fe7f20da0 ffff881fd0da0310
>  ffff881fd0da0200 ffffffff81c9be80 ffff881fd0d6a9f0 ffff881fd0d6a220
> Call Trace:
>  [<ffffffffa0235524>] ? uio_release+0x34/0x60 [uio]
>  [<ffffffff811b1329>] ? __fput+0xe9/0x270
>  [<ffffffff811b15fe>] ? ____fput+0xe/0x10
>  [<ffffffff810823e4>] ? task_work_run+0xc4/0xe0
>  [<ffffffff81063deb>] ? do_exit+0x2cb/0xa60
>  [<ffffffff815e965b>] ? _raw_spin_unlock_irqrestore+0x1b/0x40
>  [<ffffffff810645ff>] ? do_group_exit+0x3f/0xa0
>  [<ffffffff81074010>] ? get_signal_to_deliver+0x1d0/0x6e0
>  [<ffffffffa0289224>] ? tun_chr_aio_read+0xa4/0xc0 [tun]
>  [<ffffffff81012437>] ? do_signal+0x57/0x600
>  [<ffffffff815f0ae0>] ? kprobe_flush_task+0xd0/0x170
>  [<ffffffff81092e3a>] ? finish_task_switch+0x14a/0x170
>  [<ffffffff81012a49>] ? do_notify_resume+0x69/0xb0
>  [<ffffffff815e9c7c>] ? retint_signal+0x48/0x8c
> 
> 
> Thanks,
> Jerry
> 
> 
> .
>