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  1. RHEL
  2. RHEL-7360

Qemu Core Dumped When Writing Larger Size Than The Size of A Data Disk

Details

    • qemu-kvm-8.1.0-3.el9
    • Major
    • Regression, CustomerScenariosInitiative
    • sst_virtualization_storage
    • ssg_virtualization
    • 9
    • 12
    • 3
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    Description

      Description of problem:
      As subject.

      Version-Release number of selected component (if applicable):
      qemu-kvm-8.1.0-0.rc4.el9.preview
      kernel-5.14.0-340.el9.x86_64

      How reproducible:
      100%

      Steps to Reproduce:
      1. Prepare a LV block file

      1. qemu-img create -f raw /home/lvm.img 60G
      2. losetup /dev/loop1 /home/lvm.img
      3. pvcreate /dev/loop1 --metadatasize=1m --metadatacopies=2 --metadataignore=y
      4. vgcreate vg /dev/loop1 --physicalextentsize=1m
      5. lvcreate --autobackup n --contiguous n --size 1024M -n lv1 vg
      6. qemu-img create -f qcow2 /dev/vg/lv1 60G

      2. Boot up a guest with the LV as a data disk

      1. /usr/libexec/qemu-kvm \
        -S \
        -name 'avocado-vt-vm1' \
        -sandbox on \
        -blockdev ' {"node-name": "file_ovmf_code", "driver": "file", "filename": "/usr/share/OVMF/OVMF_CODE.secboot.fd", "auto-read-only": true, "discard": "unmap"}

        ' \
        -blockdev '

        {"node-name": "drive_ovmf_code", "driver": "raw", "read-only": true, "file": "file_ovmf_code"}

        ' \
        -blockdev '

        {"node-name": "file_ovmf_vars", "driver": "file", "filename": "/root/avocado/data/avocado-vt/avocado-vt-vm1_rhel930-64-virtio-scsi-ovmf_qcow2_filesystem_VARS.raw", "auto-read-only": true, "discard": "unmap"}

        ' \
        -blockdev '

        {"node-name": "drive_ovmf_vars", "driver": "raw", "read-only": false, "file": "file_ovmf_vars"}

        ' \
        -machine q35,pflash0=drive_ovmf_code,pflash1=drive_ovmf_vars,memory-backend=mem-machine_mem \
        -device '

        {"id": "pcie-root-port-0", "driver": "pcie-root-port", "multifunction": true, "bus": "pcie.0", "addr": "0x1", "chassis": 1}

        ' \
        -device '

        {"id": "pcie-pci-bridge-0", "driver": "pcie-pci-bridge", "addr": "0x0", "bus": "pcie-root-port-0"}

        ' \
        -nodefaults \
        -device '

        {"driver": "VGA", "bus": "pcie.0", "addr": "0x2"}

        ' \
        -m 30720 \
        -object '

        {"size": 32212254720, "id": "mem-machine_mem", "qom-type": "memory-backend-ram"}

        ' \
        -smp 10,maxcpus=10,cores=5,threads=1,dies=1,sockets=2 \
        -cpu 'Cascadelake-Server-noTSX',+kvm_pv_unhalt \
        -chardev socket,wait=off,server=on,id=qmp_id_qmpmonitor1,path=/var/tmp/avocado_r9ni1_l3/monitor-qmpmonitor1-20230824-030703-TgoNPdRk \
        -mon chardev=qmp_id_qmpmonitor1,mode=control \
        -chardev socket,wait=off,server=on,id=qmp_id_catch_monitor,path=/var/tmp/avocado_r9ni1_l3/monitor-catch_monitor-20230824-030703-TgoNPdRk \
        -mon chardev=qmp_id_catch_monitor,mode=control \
        -device '

        {"ioport": 1285, "driver": "pvpanic", "id": "idSpXmJe"}

        ' \
        -chardev socket,wait=off,server=on,id=chardev_serial0,path=/var/tmp/avocado_r9ni1_l3/serial-serial0-20230824-030703-TgoNPdRk \
        -device '

        {"id": "serial0", "driver": "isa-serial", "chardev": "chardev_serial0"}

        ' \
        -chardev socket,id=seabioslog_id_20230824-030703-TgoNPdRk,path=/var/tmp/avocado_r9ni1_l3/seabios-20230824-030703-TgoNPdRk,server=on,wait=off \
        -device isa-debugcon,chardev=seabioslog_id_20230824-030703-TgoNPdRk,iobase=0x402 \
        -device '

        {"id": "pcie-root-port-1", "port": 1, "driver": "pcie-root-port", "addr": "0x1.0x1", "bus": "pcie.0", "chassis": 2}

        ' \
        -device '

        {"driver": "qemu-xhci", "id": "usb1", "bus": "pcie-root-port-1", "addr": "0x0"}

        ' \
        -device '

        {"driver": "usb-tablet", "id": "usb-tablet1", "bus": "usb1.0", "port": "1"}

        ' \
        -device '

        {"id": "pcie-root-port-2", "port": 2, "driver": "pcie-root-port", "addr": "0x1.0x2", "bus": "pcie.0", "chassis": 3}

        ' \
        -device '

        {"id": "virtio_scsi_pci0", "driver": "virtio-scsi-pci", "bus": "pcie-root-port-2", "addr": "0x0"}

        ' \
        -blockdev '{"node-name": "file_image1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/rhel930-64-virtio-scsi-ovmf.qcow2", "cache": {"direct": true, "no-flush": false}}' \
        -blockdev '

        Unknown macro: {"node-name"}

        ' \
        -device '

        {"driver": "scsi-hd", "id": "image1", "drive": "drive_image1", "write-cache": "on"}

        ' \
        -blockdev '{"node-name": "file_stg1", "driver": "host_device", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/dev/vg/lv1", "cache": {"direct": true, "no-flush": false}}' \
        -blockdev '

        Unknown macro: {"node-name"}

        ' \
        -device '

        {"driver": "scsi-hd", "id": "stg1", "drive": "drive_stg1", "write-cache": "on", "rerror": "stop", "werror": "stop", "serial": "TARGET_DISK0"}

        ' \
        -device '

        {"id": "pcie-root-port-3", "port": 3, "driver": "pcie-root-port", "addr": "0x1.0x3", "bus": "pcie.0", "chassis": 4}

        ' \
        -device '

        {"driver": "virtio-net-pci", "mac": "9a:c4:b4:6c:7c:ec", "id": "id9xdoY8", "netdev": "idXoIpNF", "bus": "pcie-root-port-3", "addr": "0x0"}

        ' \
        -netdev tap,id=idXoIpNF,vhost=on \
        -vnc :0 \
        -rtc base=utc,clock=host,driftfix=slew \
        -boot menu=off,order=cdn,once=c,strict=off \
        -enable-kvm \
        -monitor stdio \
        -device '

        {"id": "pcie_extra_root_port_0", "driver": "pcie-root-port", "multifunction": true, "bus": "pcie.0", "addr": "0x3", "chassis": 5}

        '

      3. Write data to the data disk in guest
      (guest)# dd if=/dev/urandom of=/dev/sdb bs=1M count=50000 oflag=direct

      Actual results:
      After about several sec/1 minute, the qemu coredumped
      (qemu) qemu.sh: line 46: 20707 Floating point exception(core dumped) /usr/libexec/qemu-kvm -S -name 'avocado-vt-vm1' -sandbox on -blockdev '

      {"node-name": "file_ovmf_code", "driver": "file", "filename": "/usr/share/OVMF/OVMF_CODE.secboot.fd", "auto-read-only": true, "discard": "unmap"}

      ' -blockdev '

      {"node-name": "drive_ovmf_code", "driver": "raw", "read-only": true, "file": "file_ovmf_code"}

      ' -blockdev '

      {"node-name": "file_ovmf_vars", "driver": "file", "filename": "/root/avocado/data/avocado-vt/avocado-vt-vm1_rhel930-64-virtio-scsi-ovmf_qcow2_filesystem_VARS.raw", "auto-read-only": true, "discard": "unmap"}

      ' -blockdev '

      {"node-name": "drive_ovmf_vars", "driver": "raw", "read-only": false, "file": "file_ovmf_vars"}

      ' -machine q35,pflash0=drive_ovmf_code,pflash1=drive_ovmf_vars,memory-backend=mem-machine_mem -device '

      {"id": "pcie-root-port-0", "driver": "pcie-root-port", "multifunction": true, "bus": "pcie.0", "addr": "0x1", "chassis": 1}

      ' -device '

      {"id": "pcie-pci-bridge-0", "driver": "pcie-pci-bridge", "addr": "0x0", "bus": "pcie-root-port-0"}

      ' -nodefaults -device '

      {"driver": "VGA", "bus": "pcie.0", "addr": "0x2"}

      ' -m 30720 -object '

      {"size": 32212254720, "id": "mem-machine_mem", "qom-type": "memory-backend-ram"}

      ' -smp 10,maxcpus=10,cores=5,threads=1,dies=1,sockets=2 -cpu 'Cascadelake-Server-noTSX',+kvm_pv_unhalt -chardev socket,wait=off,server=on,id=qmp_id_qmpmonitor1,path=/var/tmp/avocado_r9ni1_l3/monitor-qmpmonitor1-20230824-030703-TgoNPdRk -mon chardev=qmp_id_qmpmonitor1,mode=control -chardev socket,wait=off,server=on,id=qmp_id_catch_monitor,path=/var/tmp/avocado_r9ni1_l3/monitor-catch_monitor-20230824-030703-TgoNPdRk -mon chardev=qmp_id_catch_monitor,mode=control -device '

      {"ioport": 1285, "driver": "pvpanic", "id": "idSpXmJe"}

      ' -chardev socket,wait=off,server=on,id=chardev_serial0,path=/var/tmp/avocado_r9ni1_l3/serial-serial0-20230824-030703-TgoNPdRk -device '

      {"id": "serial0", "driver": "isa-serial", "chardev": "chardev_serial0"}

      ' -chardev socket,id=seabioslog_id_20230824-030703-TgoNPdRk,path=/var/tmp/avocado_r9ni1_l3/seabios-20230824-030703-TgoNPdRk,server=on,wait=off -device isa-debugcon,chardev=seabioslog_id_20230824-030703-TgoNPdRk,iobase=0x402 -device '

      {"id": "pcie-root-port-1", "port": 1, "driver": "pcie-root-port", "addr": "0x1.0x1", "bus": "pcie.0", "chassis": 2}

      ' -device '

      {"driver": "qemu-xhci", "id": "usb1", "bus": "pcie-root-port-1", "addr": "0x0"}

      ' -device '

      {"driver": "usb-tablet", "id": "usb-tablet1", "bus": "usb1.0", "port": "1"}

      ' -device '

      {"id": "pcie-root-port-2", "port": 2, "driver": "pcie-root-port", "addr": "0x1.0x2", "bus": "pcie.0", "chassis": 3}

      ' -device '

      {"id": "virtio_scsi_pci0", "driver": "virtio-scsi-pci", "bus": "pcie-root-port-2", "addr": "0x0"}

      ' -blockdev '{"node-name": "file_image1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/rhel930-64-virtio-scsi-ovmf.qcow2", "cache": {"direct": true, "no-flush": false}}' -blockdev '{"node-name": "drive_image1", "driver": "qcow2", "read-only": false, "cache":

      {"direct": true, "no-flush": false}

      , "file": "file_image1"}' -device '

      {"driver": "scsi-hd", "id": "image1", "drive": "drive_image1", "write-cache": "on"}

      ' -blockdev '{"node-name": "file_stg1", "driver": "host_device", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/dev/vg/lv1", "cache": {"direct": true, "no-flush": false}}' -blockdev '{"node-name": "drive_stg1", "driver": "qcow2", "read-only": false, "cache":

      {"direct": true, "no-flush": false}

      , "file": "file_stg1"}' -device '

      {"driver": "scsi-hd", "id": "stg1", "drive": "drive_stg1", "write-cache": "on", "rerror": "stop", "werror": "stop", "serial": "TARGET_DISK0"}

      ' -device '

      {"id": "pcie-root-port-3", "port": 3, "driver": "pcie-root-port", "addr": "0x1.0x3", "bus": "pcie.0", "chassis": 4}

      ' -device '

      {"driver": "virtio-net-pci", "mac": "9a:c4:b4:6c:7c:ec", "id": "id9xdoY8", "netdev": "idXoIpNF", "bus": "pcie-root-port-3", "addr": "0x0"}

      ' -netdev tap,id=idXoIpNF,vhost=on -vnc :0 -rtc base=utc,clock=host,driftfix=slew -boot menu=off,order=cdn,once=c,strict=off -enable-kvm -monitor stdio -device '

      {"id": "pcie_extra_root_port_0", "driver": "pcie-root-port", "multifunction": true, "bus": "pcie.0", "addr": "0x3", "chassis": 5}

      '

      Expected results:
      No core dumped.

      Additional info:
      Stack trace of thread 20707:
      #0 0x0000557f25964609 get_zones_wp (qemu-kvm + 0x86b609)
      #1 0x0000557f25964b27 raw_co_prw (qemu-kvm + 0x86bb27)
      #2 0x0000557f2590a914 bdrv_driver_pwritev (qemu-kvm + 0x811914)
      #3 0x0000557f2590527d bdrv_aligned_pwritev (qemu-kvm + 0x80c27d)
      #4 0x0000557f259048d3 bdrv_co_pwritev_part (qemu-kvm + 0x80b8d3)
      #5 0x0000557f25942389 qcow2_co_pwritev_task (qemu-kvm + 0x849389)
      #6 0x0000557f25941e63 qcow2_co_pwritev_task_entry (qemu-kvm + 0x848e63)
      #7 0x0000557f2594163a qcow2_add_task (qemu-kvm + 0x84863a)
      #8 0x0000557f2593978c qcow2_co_pwritev_part (qemu-kvm + 0x84078c)
      #9 0x0000557f2590a7ea bdrv_driver_pwritev (qemu-kvm + 0x8117ea)
      #10 0x0000557f2590527d bdrv_aligned_pwritev (qemu-kvm + 0x80c27d)
      #11 0x0000557f259048d3 bdrv_co_pwritev_part (qemu-kvm + 0x80b8d3)
      #12 0x0000557f258ef8a6 blk_co_do_pwritev_part.llvm.4925601650272942953 (qemu-kvm + 0x7f68a6)
      #13 0x0000557f258f01d2 blk_aio_write_entry.llvm.4925601650272942953 (qemu-kvm + 0x7f71d2)
      #14 0x0000557f25ae0006 coroutine_trampoline.llvm.17812621179749689021 (qemu-kvm + 0x9e7006)
      #15 0x00007f4aa1e2a360 n/a (libc.so.6 + 0x2a360)
      #16 0x40a47d7e8f1e8300 n/a (n/a + 0x0)
      ELF object binary architecture: AMD x86-64

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              hreitz@redhat.com Hanna Czenczek
              timao@redhat.com Tingting Mao
              qing wang qing wang
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                Created:
                Updated: