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Description of problem: When using the scratch build containing the fix for bug 1016736, migratino aborts on the destination with: Unknown savevm section type 115 load of migration failed Version-Release number of selected component (if applicable): Destination host: qemu-kvm-1.5.3-9.el7.x86_64 Source host: qemu-kvm-0.12.1.2-2.412.el6.max_version_id_v2.x86_64 (from https://brewweb.devel.redhat.com/taskinfo?taskID=6415967 ) How reproducible: Always. Steps to Reproduce: 1. Source: /usr/libexec/qemu-kvm -m 1024 -drive file=/var/lib/libvirt/images/rhel64.qcow2,format=qcow2 -vnc :0 -vga cirrus -nodefaults -monitor stdio 2. Destination: /usr/libexec/qemu-kvm -m 1024 -drive file=/var/lib/libvirt/images/rhel64.qcow2,format=qcow2 -vnc :0 -vga cirrus -nodefaults -monitor stdio -incoming tcp:0.0.0.0:1234 3. Monitor on source: migrate tcp:destination-host:1234 Additional info: Dump ofthe sections being loaded on destination, with help from gdb: Breakpoint 4, vmstate_load (f=0x5555566ad760, se=0x55555668aad0, version_id=2) at /usr/src/debug/qemu-1.5.3/savevm.c:1756 1756 { 1: *se = {entry = {tqe_next = 0x5555566871b0, tqe_prev = 0x55555668ace0}, idstr = "fdc", '\000' <repeats 252 times>, instance_id = 0, alias_id = 1008, version_id = 2, section_id = 25, ops = 0x0, vmsd = 0x555555bce940 <vmstate_isa_fdc>, opaque = 0x55555668af10, compat = 0x0, no_migrate = 0, is_ram = 0} $981 = {entry = {tqe_next = 0x5555566871b0, tqe_prev = 0x55555668ace0}, idstr = "fdc", '\000' <repeats 252 times>, instance_id = 0, alias_id = 1008, version_id = 2, section_id = 25, ops = 0x0, vmsd = 0x555555bce940 <vmstate_isa_fdc>, opaque = 0x55555668af10, compat = 0x0, no_migrate = 0, is_ram = 0} Breakpoint 4, vmstate_load (f=0x5555566ad760, se=0x5555566970c0, version_id=2) at /usr/src/debug/qemu-1.5.3/savevm.c:1756 1756 { 1: *se = {entry = {tqe_next = 0x0, tqe_prev = 0x555556689ac0}, idstr = "0000:00:01.3/piix4_pm", '\000' <repeats 234 times>, instance_id = 0, alias_id = -1, version_id = 3, section_id = 28, ops = 0x0, vmsd = 0x555555b58ca0 <vmstate_acpi>, opaque = 0x555556688310, compat = 0x555556697230, no_migrate = 0, is_ram = 0} $982 = {entry = {tqe_next = 0x0, tqe_prev = 0x555556689ac0}, idstr = "0000:00:01.3/piix4_pm", '\000' <repeats 234 times>, instance_id = 0, alias_id = -1, version_id = 3, section_id = 28, ops = 0x0, vmsd = 0x555555b58ca0 <vmstate_acpi>, opaque = 0x555556688310, compat = 0x555556697230, no_migrate = 0, is_ram = 0} Unknown savevm section type 115 load of migration failed [Thread 0x7fffebae6700 (LWP 29858) exited] [Thread 0x7ffff7fcaa00 (LWP 29856) exited] [Inferior 1 (process 29856) exited with code 01] (gdb) The problem may be in the "piix4_pm" section, but I couldn't find any obvious issues from a quick look.
(In reply to Eduardo Habkost from comment #0) > Steps to Reproduce: > 1. Source: /usr/libexec/qemu-kvm -m 1024 -drive > file=/var/lib/libvirt/images/rhel64.qcow2,format=qcow2 -vnc :0 -vga cirrus > -nodefaults -monitor stdio > 2. Destination: /usr/libexec/qemu-kvm -m 1024 -drive > file=/var/lib/libvirt/images/rhel64.qcow2,format=qcow2 -vnc :0 -vga cirrus > -nodefaults -monitor stdio -incoming tcp:0.0.0.0:1234 > 3. Monitor on source: migrate tcp:destination-host:1234 Oops, I forgot to add the machine-type. But the bug can be reproduced when using "-machine rhel6.4.0" as well.
From hw/acpi/piix4.c: /* qemu-kvm 1.2 uses version 3 but advertised as 2 * To support incoming qemu-kvm 1.2 migration, change version_id * and minimum_version_id to 2 below (which breaks migration from * qemu 1.2). * */ static const VMStateDescription vmstate_acpi = { .name = "piix4_pm", .version_id = 3, .minimum_version_id = 3, .minimum_version_id_old = 1, .load_state_old = acpi_load_old, The v3 format of qemu-0.13 (implemented by commit 4cf3e6f3d85492f20a773dd6c9068ab89ba24a18) is not compatible with the v3 format of qemu-0.15 and newer (broken by commit 23910d3f669d46073b403876e30a7314599633af). RHEL-6 is using the v3 format that was included on qemu-0.13, which is not compatible with qemu 0.15 and newer (including qemu 1.2). Probably setting minimum_version_id=2 will work.
Fix included in qemu-kvm-1.5.3-11.el7
This request was resolved in Red Hat Enterprise Linux 7.0. Contact your manager or support representative in case you have further questions about the request.