Public bug reported:
I am using qemu-2.10.1, or actually libvirt, to create a virtual machine,
running microsoft windows 10 pro operating system.
It installed fine and was actually working, however sometimes when trying to
boot the vm, the whole boot process gets stuck.
For some reason, it seemed to happen only when enough physical memory is taken
so that, when booting a windows vm that has 4gb of available ram, host starts
swapping some other processes. It is not always happening there, but often it
happens, and I do not remember seeing any case of this happening when not
swapping, maybe a kind of a timing issue?
When this happens, I usually try to hard reset the machine by libvirt reset
command or equivalent system_reset on qemu monitor, however the whole reset
does not happen, and the command is a noop. That makes me think it is a qemu
bug, not windows refusing operation. At the time of this event, qemu monitor
and spice server are working correctly, are not stuck, and even doing things
like system reset does not result in a monitor hang. It is also possible to
quit qemu normally.
I tried to workaround the bug by guessing what may cause it. Switched from bios
to uefi, changed virtio-scsi to ahci temporarily, and disabled virtio-balloon
in case it would be buggy, with no visible change.
I will attach a libvirt log, because it contains qemu command line. I will also
attach an example qemu backtrace.
>From what i know, both vcpu threads are working normally, at least none of
>them is stuck in a vcpu, nor deadlocked, etc. So backtrace could be different
>each time I tried to get it.
** Affects: qemu
Importance: Undecided
Status: New
** Attachment added: "example qemu backtrace from all threads"
https://bugs.launchpad.net/bugs/1738507/+attachment/5023250/+files/backtrace.txt
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https://bugs.launchpad.net/bugs/1738507
Title:
qemu sometimes stuck when booting windows 10
Status in QEMU:
New
Bug description:
I am using qemu-2.10.1, or actually libvirt, to create a virtual machine,
running microsoft windows 10 pro operating system.
It installed fine and was actually working, however sometimes when trying to
boot the vm, the whole boot process gets stuck.
For some reason, it seemed to happen only when enough physical memory is
taken so that, when booting a windows vm that has 4gb of available ram, host
starts swapping some other processes. It is not always happening there, but
often it happens, and I do not remember seeing any case of this happening when
not swapping, maybe a kind of a timing issue?
When this happens, I usually try to hard reset the machine by libvirt reset
command or equivalent system_reset on qemu monitor, however the whole reset
does not happen, and the command is a noop. That makes me think it is a qemu
bug, not windows refusing operation. At the time of this event, qemu monitor
and spice server are working correctly, are not stuck, and even doing things
like system reset does not result in a monitor hang. It is also possible to
quit qemu normally.
I tried to workaround the bug by guessing what may cause it. Switched from
bios to uefi, changed virtio-scsi to ahci temporarily, and disabled
virtio-balloon in case it would be buggy, with no visible change.
I will attach a libvirt log, because it contains qemu command line. I will
also attach an example qemu backtrace.
From what i know, both vcpu threads are working normally, at least none of
them is stuck in a vcpu, nor deadlocked, etc. So backtrace could be different
each time I tried to get it.
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