Re: [PATCH v4 00/15] Reverse debugging

[Pavel Dovgalyuk]

On 20.09.2020 10:58, Paolo Bonzini wrote:
> On 14/09/20 08:06, Pavel Dovgalyuk wrote:
> > GDB remote protocol supports reverse debugging of the targets.
> > It includes 'reverse step' and 'reverse continue' operations.
> > The first one finds the previous step of the execution,
> > and the second one is intended to stop at the last breakpoint that
> > would happen when the program is executed normally.
> >
> > Reverse debugging is possible in the replay mode, when at least
> > one snapshot was created at the record or replay phase.
> > QEMU can use these snapshots for travelling back in time with GDB.
>
> I had queued this, it is a very nice patch series.  Unfortunately, the
> tests failed on gitlab:
>
> https://gitlab.com/bonzini/qemu/-/jobs/745795080

There is a strange thing in your environment:

15:49:41 INFO | Downloading/preparing boot image
15:49:42 INFO | Running '/builds/bonzini/qemu/build/qemu-img create -f 
qcow2 -b 
/builds/bonzini/qemu/avocado-cache/by_location/d2a8d6b607afec50de14560c064f34ffd99836b2/Fedora-Cloud-Base-31-1.9.x86_64.qcow2 
/var/tmp/avocado_tj2janfx/avocado_job_ys7ueohj/04-tests_acceptance_boot_linux.py_BootLinuxX8664.test_pc_q35_kvm/Fedora-Cloud-Base-31-1.9.x86_64-d1ac1224.qcow2'


It downloads boot image, but there is no such requirement in the test.
And all this stuff consumes most of the time for the test.

Pavel Dovgalyuk