Re: [Qemu-devel] [PATCH 2/9] memory: add support getting and using a dirty bitmap copy.

[Kevin Wolf]

Am 21.04.2017 um 11:16 hat Gerd Hoffmann geschrieben:
> +bool cpu_physical_memory_snapshot_get_dirty(DirtyBitmapSnapshot *snap,
> +                                            ram_addr_t start,
> +                                            ram_addr_t length)
> +{
> +    unsigned long page, end;
> +
> +    assert(start >= snap->start);
> +    assert(start + length <= snap->end);

Not sure if this has been reported somewhere else, but I got an
assertion failure here while booting a guest:

$ ~/source/qemu/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 2G -drive 
file=Windows-10-20170427.0-x86_64.qcow2,snapshot=on -usbdevice tablet -vga qxl
qemu-system-x86_64: /home/kwolf/source/qemu/exec.c:1125: 
cpu_physical_memory_snapshot_get_dirty: Zusicherung >>start + length <= 
snap->end<< nicht erf?llt.
Abgebrochen (Speicherabzug geschrieben)

Unfortunately, I didn't have gdb attached or core dumps enabled, and it
doesn't seem to reproduce easily, so I don't have anything that could
help debugging it, but I thought I'd just let you know anyway.

Kevin