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漏洞：

tag-icon • tag-icon kvm-virtualization qemu interrupts irq
漏洞：

漏洞：

我在 Ubuntu 上有一个 qemu-kvm（主机 14.04.5 LTS 3.13.0-95；无法升级；，客户机 Ubuntu 18.04.03 LTS 4.15.0-65）客户机有两个网络接口，直接（VEPA）连接到两个单独的主机物理接口。客户机上运行的程序通过其 LAN 接口接收大量流量。大约 1 小时后，此 LAN 接口永久断开网络，客户机 CPU 核心锁定处理来自该接口的软 IRQ 负载。在接口锁定之前的实际流量期间，IRQ 负载微不足道。

主持人：


$ top
  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND

14393 libvirt+  20   0  0.101t 7.821g   9524 S 124.7  5.5   1187:32 qemu-system-x86 



$ strace -f -p 14393
[pid 14401] ioctl(9, KVM_IRQ_LINE_STATUS, 0x7f2749ffaa90) = 0
[pid 14401] ioctl(9, KVM_IRQ_LINE_STATUS, 0x7f2749ffaac0) = 0
…



$ apt show qemu-system-x86
Package: qemu-system-x86
Version: 2.0.0+dfsg-2ubuntu1.46

问题配置中的接口

<interface type='direct'>
  <mac address='52:54:00:68:df:1e'/>
  <source dev='eth1' mode='vepa'/>
  <target dev='macvtap1'/>
  <model type='rtl8139'/>
  <alias name='net1'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>

客人：


$ top



PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
52 root      20   0       0      0      0 R  99.7  0.0   1055:23 softirqd/7

来宾上没有运行任何其他程序


$ tail /var/log/kern.log



Oct  5 09:54:07 bigram kernel: [67536.228012] watchdog: BUG: soft lockup - CPU#7 stuck for 23s! [ksoftirqd/7:52]
Oct  5 09:54:07 bigram kernel: [67536.228054] Modules linked in: kvm irqbypass input_leds joydev mac_hid serio_raw sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt 8139too psmouse fb_sys_fops floppy drm 8139cp virtio_blk mii i2c_piix4 pata_acpi
Oct  5 09:54:07 bigram kernel: [67536.228054] CPU: 7 PID: 52 Comm: ksoftirqd/7 Tainted: G             L   4.15.0-65-generic #74-Ubuntu





root@bigram:~$ cat /proc/interrupts 
           CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7

  0:         44          0          0          0          0          0          0          0   IO-APIC   2-edge      timer
  1:          0          0          0          0          0          0          0          9   IO-APIC   1-edge      i8042
  6:          0          3          0          0          0          0          0          0   IO-APIC   6-edge      floppy
  8:          1          0          0          0          0          0          0          0   IO-APIC   8-edge      rtc0
  9:          0          0          0          0          0          0          0          0   IO-APIC   9-fasteoi   acpi
10:           0          0        113          0          0          0          0 2912922455   IO-APIC  10-fasteoi   virtio1, ens6



root@bigram:~$ ifconfig -v ens6
ens6: flags=4163  mtu 1500
        inet 10.18.8.0  netmask 255.255.0.0  broadcast 10.18.255.255
        inet6 fe80::5054:ff:fe68:df1e  prefixlen 64  scopeid 0x20
        ether 52:54:00:68:df:1e  txqueuelen 1000  (Ethernet)
        RX packets 15019446  bytes 22384515076 (22.3 GB)
        RX errors 0  dropped 581076  overruns 0  frame 0
        TX packets 660384  bytes 95322423 (95.3 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 3301735

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