Bug 1371458

Summary: qemu-kvm SIGABRT when start two VM sharing one OS image with cache='none' io='native'
Product: Red Hat Enterprise Linux 7 Reporter: Han Han <hhan>
Component: qemu-kvm-rhevAssignee: Fam Zheng <famz>
Status: CLOSED DUPLICATE QA Contact: CongLi <coli>
Severity: low Docs Contact:
Priority: low    
Version: 7.3CC: aliang, chayang, coli, dyuan, hachen, juzhang, knoel, lmen, meyang, michen, ngu, pingl, virt-maint, xfu, xuwei, xuzhang, yanyang
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2017-01-23 06:27:15 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
gdb backtrace none

Description Han Han 2016-08-30 09:12:00 UTC 
Created attachment 1195796 [details]
gdb backtrace

Description of problem:
As subject

Version-Release number of selected component (if applicable):
libvirt-2.0.0-6.el7.x86_64
qemu-kvm-rhev-2.6.0-22.el7.x86_64


How reproducible:
100%

Steps to Reproduce:
1. Define VM n1 and n2 with following xml:
```
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none' io='native'/>
      <source file='/var/lib/libvirt/images/n1.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </disk>
```

2. Start n1 and n2
# virsh start n1                                                    
Domain n1 started

# virsh start n2                                                    
Domain n2 started

Then qemu will get SIGABRT.
# abrt-cli ls |head
id 865c7462a00c42953cfcb2fb36097955ac7c9394
reason:         qemu-kvm killed by SIGABRT
time:           Thu 25 Aug 2016 05:33:45 PM CST
cmdline:        /usr/libexec/qemu-kvm -name guest=n1,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-19-n1/master-key.aes -machine pc-i440fx-rhel7.3.0,accel=kvm,usb=off,vmport=off -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid f9a661af-0fa5-4a14-84a1-c3ac73916e54 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-19-n1/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device pci-bridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0xb -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x6.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x6 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x6.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0xa -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/var/lib/libvirt/images/n1.qcow2,format=qcow2,if=none,id=drive-virtio-disk0,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=32,id=hostnet0,vhost=on,vhostfd=34 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:b1:0f:ce,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-19-n1/org.qemu.guest_agent.0,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -device virtio-mouse-pci,id=input1,bus=pci.0,addr=0xc -device virtio-keyboard-pci,id=input2,bus=pci.0,addr=0xd -spice port=5900,tls-port=5901,addr=0.0.0.0,disable-ticketing,x509-dir=/etc/pki/libvirt-spice,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -object rng-random,id=objrng0,filename=/dev/random -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.0,addr=0x9 -msg timestamp=on
package:        qemu-kvm-rhev-2.6.0-22.el7
uid:            107 (qemu)
count:          1
Directory:      /var/spool/abrt/ccpp-2016-08-25-05:33:45-24954
Reported:       http://faf-report.itos.redhat.com/reports/bthash/48f599eaf3a9a4aa7f12e18726715aa176fbe47b
Run 'abrt-cli report /var/spool/abrt/ccpp-2016-08-25-05:33:45-24954' for creating a case in Red Hat Customer Portal


Actual results:


Expected results:


Additional info:
Comment 2 Ademar Reis 2016-08-31 20:38:50 UTC 
One can't use the same disk by two running VMs, so the abort() is somehow expected.

I'm assigning it to Fam just in case there's a low-hanging fruit to be fixed (better error message), or just to mark it fixed in the next rebase, when hopefully we'll have the image locking patches included.
Comment 3 Fam Zheng 2017-01-23 06:27:15 UTC 
We already have many BZs for image locking, and this senario is so typical as the invalid use case that we'll try to protect against, so no need to keep it IMO.

*** This bug has been marked as a duplicate of bug 1378241 ***