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------- Comment From brenohl@xxxxxxxxxx 2016-03-08 13:05 EDT-------
> Breno -  commit 1356aae08338f1c19ce1c67bf8c543a267688fc3 ('blk-mq: avoid
> setting hctx->tags->cpumask before allocation') was cherry-picked in
> Ubuntu-4.2.0-19.23 as part of the v4.2.4 stable update.

Thanks Tim

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https://bugs.launchpad.net/bugs/1543480

Title:
  ISST-KVM:Ubuntu1510:abakvm: abag3 guest hung while running stress
  test.

Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0  ==
  Issue
  ====
  The Ubuntu1510 guest abag3 was running with stress test IO Base and TCP. After 40 hrs it hung , unable to perform ssh and unable to access its console but able to ping the guest. Xmon was enable for guest but it didn't drop there.

  [root@abakvm ~]# virsh list --all
   Id    Name                           State
  ----------------------------------------------------
   11    abag6                          running
   23    abag5                          running
   25    abag1                          running
   27    abag2                          running
   29    abag3                          running
   30    abag4                          running

  Logs
  ===
  [127112.624493] NIP [c0000000005183d8] __blk_mq_run_hw_queue+0x98/0x4c0
  [127112.624953] LR [c0000000000d9320] process_one_work+0x1e0/0x560
  [127112.625343] Call Trace:
  [127112.625505] [c000000179adbb50] [c000000001578190] cur_cpu_spec+0x0/0x8 (unreliable)
  [127112.626079] [c000000179adbc50] [c0000000000d9320] process_one_work+0x1e0/0x560
  [127112.627154] [c000000179adbce0] [c0000000000d9830] worker_thread+0x190/0x660
  [127112.627620] [c000000179adbd80] [c0000000000e2280] kthread+0x110/0x130
  [127112.628084] [c000000179adbe30] [c000000000009538] ret_from_kernel_thread+0x5c/0xa4
  [127112.628743] Instruction dump:
  [127112.629080] 391e0188 eb1e0298 fb810088 fac10078 a12d0008 792ad182 792906a0 794a1f24 
  [127112.630112] 7d48502a 7d494c36 792907e0 69290001 <0b090000> e93e0080 792a07e1 408202c8 
  [127112.631318] ---[ end trace de34117cdb302980 ]---

  
  XML of abag3
  ========
  [root@abakvm ~]# virsh dumpxml abag3
  <domain type='kvm' id='29'>
    <name>abag3</name>
    <uuid>4d73aa99-64f3-4d1d-af02-995abb29cfc5</uuid>
    <memory unit='KiB'>6291456</memory>
    <currentMemory unit='KiB'>6291456</currentMemory>
    <memoryBacking>
      <hugepages/>
    </memoryBacking>
    <vcpu placement='static'>48</vcpu>
    <cputune>
      <shares>4096</shares>
    </cputune>
    <resource>
      <partition>/machine</partition>
    </resource>
    <os>
      <type arch='ppc64' machine='pseries-2.4'>hvm</type>
      <boot dev='hd'/>
      <boot dev='network'/>
      <bootmenu enable='yes'/>
    </os>
    <features>
      <acpi/>
      <apic/>
    </features>
    <cpu mode='host-model'>
      <model fallback='allow'>power8</model>
      <topology sockets='4' cores='3' threads='8'/>
    </cpu>
    <clock offset='utc'/>
    <on_poweroff>destroy</on_poweroff>
    <on_reboot>restart</on_reboot>
    <on_crash>coredump-restart</on_crash>
    <devices>
      <emulator>/usr/bin/qemu-system-ppc64</emulator>
      <disk type='block' device='disk'>
        <driver name='qemu' type='raw'/>
        <source dev='/dev/disk/by-id/dm-uuid-part3-mpath-1IBM_IPR-0_5EC08100000006A0'/>
        <backingStore/>
        <target dev='vda' bus='virtio'/>
        <alias name='virtio-disk0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
      </disk>
      <disk type='file' device='disk'>
        <driver name='qemu' type='raw'/>
        <source file='/var/lib/libvirt/images/abag3_io1'/>
        <backingStore/>
        <target dev='vdb' bus='virtio'/>
        <alias name='virtio-disk1'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
      </disk>
      <disk type='file' device='disk'>
        <driver name='qemu' type='raw'/>
        <source file='/var/lib/libvirt/images/abag3_io2'/>
        <backingStore/>
        <target dev='vdc' bus='virtio'/>
        <alias name='virtio-disk2'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
      </disk>
      <controller type='usb' index='0'>
        <alias name='usb'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
      </controller>
      <controller type='pci' index='0' model='pci-root'>
        <alias name='pci.0'/>
      </controller>
      <interface type='bridge'>
        <mac address='52:54:00:c3:a0:b0'/>
        <source bridge='brenP1p5s0f1'/>
        <target dev='vnet2'/>
        <model type='virtio'/>
        <alias name='net0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
      </interface>
      <serial type='pty'>
        <source path='/dev/pts/10'/>
        <target type='isa-serial' port='0'/>
        <alias name='serial0'/>
        <address type='spapr-vio' reg='0x30000000'/>
      </serial>
      <console type='pty' tty='/dev/pts/10'>
        <source path='/dev/pts/10'/>
        <target type='serial' port='0'/>
        <alias name='serial0'/>
        <address type='spapr-vio' reg='0x30000000'/>
      </console>
      <memballoon model='virtio'>
        <alias name='balloon0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
      </memballoon>
    </devices>
    <seclabel type='none' model='selinux'/>
  </domain>


  SYSTEM INFORMATION
  ---------------------------------
  HOST 
  KVM BUILD LEVEL:                  GA3 SP1 build 51
  OPAL - FW840.10 - F4_1606A

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