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Verify the case again ,and found that the unit of the qmp is KB and the hmp unit is MB ,it looks some of my peration is some wrong , so close as NOTABUG.
Thanks,
yaxue
The unit in QMP is bytes. So, when you do:
{'execute': 'balloon', 'arguments': {'value': 4096}, 'id': 'a9wcLaCf'}
You're setting the guest memory to 4KB.
Description of problem: RHEL6.6 Guest kernel panic when doing memory balloon ,the guest default memory is 16G. Version-Release number of selected component (if applicable): Host: kernel-3.10.0-191.el7.x86_64 qemu-kvm-rhev-2.1.2-4.el7.x86_64 Guest:kernel-2.6.32-504.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1.Mount nfs server to host 10.66.90.115:/vol/s2imagetest /mnt/nfs_images nfs4 rw,sync,relatime,vers=4.0,rsize=65536,wsize=65536,namlen=255,soft,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.66.106.28,local_lock=none,addr=10.66.90.115 0 0 2.Install RHEL6.6 guest with the following command line: /bin/qemu-kvm \ -S \ -name 'virt-tests-vm1' \ -sandbox off \ -M pc \ -nodefaults \ -vga cirrus \ -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20141022-193557-QJLhjXuR,server,nowait \ -mon chardev=qmp_id_qmpmonitor1,mode=control \ -chardev socket,id=serial_id_serial0,path=/tmp/serial-serial0-20141022-193557-QJLhjXuR,server,nowait \ -device isa-serial,chardev=serial_id_serial0 \ -chardev socket,id=seabioslog_id_20141022-193557-QJLhjXuR,path=/tmp/seabios-20141022-193557-QJLhjXuR,server,nowait \ -device isa-debugcon,chardev=seabioslog_id_20141022-193557-QJLhjXuR,iobase=0x402 \ -device ich9-usb-uhci1,id=usb1,bus=pci.0,addr=03 \ -drive id=drive_image1,if=none,cache=writethrough,snapshot=off,aio=native,file=/mnt/nfs_images/RHEL-Server-6.6-64-virtio.qcow2 \ -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=0,bus=pci.0,addr=04 \ -device virtio-net-pci,mac=9a:20:21:22:23:24,id=idVW1oir,vectors=4,netdev=idRBRvtc,bus=pci.0,addr=05 \ -netdev tap,id=idRBRvtc,vhost=on,vhostfd=23,fd=22 \ -m 16384 \ -smp 16,cores=4,threads=2,sockets=2 \ -cpu 'Westmere',+kvm_pv_unhalt \ -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \ -vnc :0 \ -rtc base=utc,clock=host,driftfix=slew \ -boot order=cdn,once=c,menu=off \ -device virtio-balloon-pci,id=ballooning \ -no-kvm-pit-reinjection \ -enable-kvm 3.Execute the command with qmpmonitor (Host){'execute': 'qmp_capabilities', 'id': 'PoXVO27J'} {'execute': 'query-cpus', 'id': 'pDIQVMqu'} {'execute': 'balloon', 'arguments': {'value': 4096}, 'id': 'a9wcLaCf'} Actual results: Guest kernel panic occured. Expected results: Guest memory balloon successfully Additional info: virtio_balloon virtio2: Out of puff! Can't get 256 pages See more details from the attatchment(serial_log) The guest memory before balloon: RedHat Kernel2.6.32-504.el6.x86_64 localhost.localdomain login: MemTotal: 16327544 kB MemFree: 15918920 kB Buffers: 21024 kB Cached: 111036 kB SwapCached: 0 kB Active: 87648 kB Inactive: 107056 kB Active(anon): 62952 kB Inactive(anon): 996 kB Active(file): 24696 kB Inactive(file): 106060 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 4194300 kB SwapFree: 4194300 kB Dirty: 852 kB Writeback: 0 kB AnonPages: 63072 kB Mapped: 32700 kB Shmem: 1172 kB Slab: 79160 kB SReclaimable: 14692 kB SUnreclaim: 64468 kB KernelStack: 3344 kB PageTables: 8828 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 12358072 kB Committed_AS: 340448 kB VmallocTotal: 34359738367 kB VmallocUsed: 41484 kB VmallocChunk: 34359694180 kB HardwareCorrupted: 0 kB AnonHugePages: 2048 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 8064 kB DirectMap2M: 16769024 kB MemTotal: 16324472 kB MemFree: 15915920 kB Buffers: 21024 kB Cached: 111056 kB SwapCached: 0 kB Active: 89600 kB Inactive: 107112 kB Active(anon): 64896 kB Inactive(anon): 996 kB Active(file): 24704 kB Inactive(file): 106116 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 4194300 kB SwapFree: 4194300 kB Dirty: 852 kB Writeback: 0 kB AnonPages: 64900 kB Mapped: 32820 kB Shmem: 1172 kB Slab: 79168 kB SReclaimable: 14696 kB SUnreclaim: 64472 kB KernelStack: 3320 kB PageTables: 8780 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 12356536 kB Committed_AS: 340452 kB VmallocTotal: 34359738367 kB VmallocUsed: 41484 kB VmallocChunk: 34359694180 kB HardwareCorrupted: 0 kB AnonHugePages: 4096 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 8064 kB DirectMap2M: 16769024 kB